1 # Copyright (C) 1991-2015 Free Software Foundation, Inc.
2 # This file is part of the GNU C Library.
4 # The GNU C Library is free software; you can redistribute it and/or
5 # modify it under the terms of the GNU Lesser General Public
6 # License as published by the Free Software Foundation; either
7 # version 2.1 of the License, or (at your option) any later version.
9 # The GNU C Library is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 # Lesser General Public License for more details.
14 # You should have received a copy of the GNU Lesser General Public
15 # License along with the GNU C Library; if not, see
16 # <http://www.gnu.org/licenses/>.
19 # Makefile configuration options for the GNU C library.
22 This makefile requires GNU Make.
25 all: # Make this the default goal
27 ifneq "$(origin +included-Makeconfig)" "file"
29 +included-Makeconfig := yes
35 # $(common-objdir) is the place to put objects and
36 # such that are not specific to a single subdir.
38 objpfx := $(patsubst %//,%/,$(objdir)/$(subdir)/)
39 common-objpfx = $(objdir)/
40 common-objdir = $(objdir)
42 objdir must be defined by the build-directory Makefile.
45 # Root of the sysdeps tree.
46 sysdep_dir := $(..)sysdeps
47 export sysdep_dir := $(sysdep_dir)
49 # Get the values defined by options to `configure'.
50 include $(common-objpfx)config.make
52 # What flags to give to sources which call user provided callbacks
53 uses-callbacks = -fexceptions
55 # What flags to give to tests which test stack alignment
56 stack-align-test-flags =
58 # Complete path to sysdep dirs.
59 # `configure' writes a definition of `config-sysdirs' in `config.make'.
60 sysdirs := $(foreach D,$(config-sysdirs),$(firstword $(filter /%,$D) $(..)$D))
62 # Add-ons that contribute sysdeps trees get added to the include list
63 # after sysdeps/generic. This makes #include <sysdeps/...> work right
64 # to find specific add-on files without assuming the add-on directory name.
65 # It also means that headers can go into an add-on's base directory
66 # instead of the add-on needing a sysdeps/generic of its own.
67 sysdeps-srcdirs := $(foreach add-on,$(sysdeps-add-ons),\
68 $(firstword $(filter /%,$(add-on)) \
70 +sysdep_dirs = $(sysdirs) $(sysdeps-srcdirs)
72 +sysdep_dirs := $(objdir) $(+sysdep_dirs)
75 # Run config.status to update config.make and config.h. We don't show the
76 # dependence of config.h to Make, because it is only touched when it
77 # changes and so config.status would be run every time; the dependence of
78 # config.make should suffice to force regeneration and re-exec, and the new
79 # image will notice if config.h changed.
80 $(common-objpfx)config.make: $(common-objpfx)config.status \
81 $(..)config.make.in $(..)config.h.in
82 cd $(<D); $(SHELL) $(<F)
84 # Find all the add-on and sysdeps configure fragments, to make sure we
85 # re-run configure when any of them changes.
86 $(common-objpfx)config.status: $(..)version.h $(..)configure \
87 $(foreach dir,$(sysdirs),\
88 $(wildcard $(dir)/Implies) \
90 $(firstword $(wildcard \
91 $(addprefix $(dir)/,configure configure.ac))))) \
93 $(wildcard $(..)sysdeps/*/preconfigure $(..)sysdeps/*/preconfigure.ac)) \
95 $(foreach add-on,$(add-ons),\
96 $(firstword $(wildcard \
97 $(addprefix $(firstword $(filter /%,$(add-on)) $(..)$(add-on))/,\
98 configure configure.ac))) \
99 $(wildcard $(addprefix $(firstword $(filter /%,$(add-on)) $(..)$(add-on))/,\
100 sysdeps/*/preconfigure sysdeps/*/preconfigure.ac))))
101 @cd $(@D); if test -f $(@F); then exec $(SHELL) $(@F) --recheck; else \
102 echo The GNU C library has not been configured. >&2; \
103 echo Run \`configure\' to configure it before building. >&2; \
104 echo Try \`configure --help\' for more details. >&2; \
107 # We don't want CPPFLAGS to be exported to the command running configure.
110 # Get the user's configuration parameters.
111 ifneq ($(wildcard $(..)configparms),)
112 include $(..)configparms
115 ifneq ($(wildcard $(common-objpfx)configparms),)
116 include $(common-objpfx)configparms
121 #### These are the configuration variables. You can define values for
122 #### the variables below in the file `configparms'.
123 #### Do NOT edit this file.
127 # Common prefix for machine-independent installation directories.
128 ifeq ($(origin prefix),undefined) # ifndef would override explicit empty value.
132 # Decide whether we shall build the programs or not. We always do this
133 # unless the user tells us (in configparms) or we are building for a
135 ifndef build-programs
136 ifneq ($(config-os),none)
143 # Common prefix for machine-dependent installation directories.
144 ifeq ($(origin exec_prefix),undefined)
145 exec_prefix = $(prefix)
148 # Where to install the library and object files.
150 libdir = $(exec_prefix)/lib
152 inst_libdir = $(install_root)$(libdir)
154 # Where to install the shared library.
156 slibdir = $(exec_prefix)/lib
158 inst_slibdir = $(install_root)$(slibdir)
160 # Where to install the dynamic linker.
164 inst_rtlddir = $(install_root)$(rtlddir)
166 # Prefix to put on files installed in $(libdir). For libraries `libNAME.a',
167 # the prefix is spliced between `lib' and the name, so the linker switch
168 # `-l$(libprefix)NAME' finds the library; for other files the prefix is
169 # just prepended to the whole file name.
170 ifeq ($(origin libprefix),undefined)
174 # Where to install the header files.
176 includedir = $(prefix)/include
178 inst_includedir = $(install_root)$(includedir)
180 # Where to install machine-independent data files.
181 # These are the timezone database, and the locale database.
183 datadir = $(prefix)/share
185 inst_datadir = $(install_root)$(datadir)
187 # Where to install the timezone data files (which are machine-independent).
189 zonedir = $(datadir)/zoneinfo
191 inst_zonedir = $(install_root)$(zonedir)
193 # Where to install the locale files.
195 localedir = $(libdir)/locale
197 inst_localedir = $(install_root)$(localedir)
199 # Where to install the message catalog data files (which are
200 # machine-independent).
202 msgcatdir = $(datadir)/locale
204 inst_msgcatdir = $(install_root)$(msgcatdir)
206 # Where to install the locale charmap source files.
208 i18ndir = $(datadir)/i18n
210 inst_i18ndir = $(install_root)$(i18ndir)
212 # Where to install the shared object for charset transformation.
214 gconvdir = $(libdir)/gconv
216 inst_gconvdir = $(install_root)$(gconvdir)
218 # Where to install programs.
220 bindir = $(exec_prefix)/bin
222 inst_bindir = $(install_root)$(bindir)
224 # Where to install internal programs.
226 libexecdir = $(exec_prefix)/libexec
228 inst_libexecdir = $(install_root)$(libexecdir)
230 # Where to install administrative programs.
232 rootsbindir = $(exec_prefix)/sbin
234 inst_rootsbindir = $(install_root)$(rootsbindir)
237 sbindir = $(exec_prefix)/sbin
239 inst_sbindir = $(install_root)$(sbindir)
241 # Where to install the Info files.
243 infodir = $(prefix)/info
245 inst_infodir = $(install_root)$(infodir)
247 # Where to install audit libraries.
249 auditdir = $(libdir)/audit
251 inst_auditdir = $(install_root)$(auditdir)
253 # Where to install default configuration files. These include the local
254 # timezone specification and network data base files.
256 sysconfdir = $(prefix)/etc
258 inst_sysconfdir = $(install_root)$(sysconfdir)
260 # Directory for the database files and Makefile for nss_db.
262 vardbdir = $(localstatedir)/db
264 inst_vardbdir = $(install_root)$(vardbdir)
266 # Where to install the "localtime" timezone file; this is the file whose
267 # contents $(localtime) specifies. If this is a relative pathname, it is
268 # relative to $(zonedir). It is a good idea to put this somewhere
269 # other than there, so the zoneinfo directory contains only universal data,
270 # localizing the configuration data elsewhere.
271 ifndef localtime-file
272 localtime-file = $(sysconfdir)/localtime
275 # What to use for leap second specifications in compiling the default
276 # timezone files. Set this to `/dev/null' for no leap second handling as
277 # 1003.1 requires, or to `leapseconds' for proper leap second handling.
278 # Both zone flavors are always available as `posix/ZONE' and `right/ZONE'.
279 # This variable determines the default: if it's `/dev/null',
280 # ZONE==posix/ZONE; if it's `leapseconds', ZONE==right/ZONE.
282 leapseconds = /dev/null
285 # What timezone's DST rules should be used when a POSIX-style TZ
286 # environment variable doesn't specify any rules. For 1003.1 compliance
287 # this timezone must use rules that are as U.S. federal law defines DST.
288 # Run `make -C time echo-zonenames' to see a list of available zone names.
289 # This setting can be changed with `zic -p TIMEZONE' at any time.
290 # If you want POSIX.1 compatibility, use `America/New_York'.
292 posixrules = America/New_York
295 # Where to install the "posixrules" timezone file; this is file
296 # whose contents $(posixrules) specifies. If this is a relative
297 # pathname, it is relative to $(zonedir).
298 ifndef posixrules-file
299 posixrules-file = posixrules
303 # Directory where your system's native header files live.
304 # This is used on Unix systems to generate some GNU libc header files.
306 sysincludedir = /usr/include
310 # Commands to install files.
312 INSTALL_DATA = $(INSTALL) -m 644
314 ifndef INSTALL_SCRIPT
315 INSTALL_SCRIPT = $(INSTALL)
317 ifndef INSTALL_PROGRAM
318 INSTALL_PROGRAM = $(INSTALL)
325 # The name of the C compiler.
326 # If you've got GCC, and it works, use it.
327 ifeq ($(origin CC),default)
331 # The name of the C compiler to use for compilations of programs to run on
332 # the host that is building the library. If you set CC to a
333 # cross-compiler, you must set this to the normal compiler.
338 # Default flags to pass the C compiler.
339 ifndef default_cflags
340 ifeq ($(release),stable)
341 default_cflags := -g -O2
343 default_cflags := -g -O
347 # Flags to pass the C compiler when assembling preprocessed assembly code
353 as-needed := -Wl,--as-needed
354 no-as-needed := -Wl,--no-as-needed
356 # Must be supported by the linker.
357 no-whole-archive = -Wl,--no-whole-archive
358 whole-archive = -Wl,--whole-archive
360 # Installed name of the startup code.
361 # The ELF convention is that the startfile is called crt1.o
362 start-installed-name = crt1.o
363 # On systems that do not need a special startfile for statically linked
364 # binaries, simply set it to the normal name.
365 ifndef static-start-installed-name
366 static-start-installed-name = $(start-installed-name)
369 ifeq (yesyes,$(build-shared)$(have-z-combreloc))
370 combreloc-LDFLAGS = -Wl,-z,combreloc
371 LDFLAGS.so += $(combreloc-LDFLAGS)
372 LDFLAGS-rtld += $(combreloc-LDFLAGS)
375 relro-LDFLAGS = -Wl,-z,relro
376 LDFLAGS.so += $(relro-LDFLAGS)
377 LDFLAGS-rtld += $(relro-LDFLAGS)
379 ifeq (yes,$(have-hash-style))
380 # For the time being we unconditionally use 'both'. At some time we
381 # should declare statically linked code as 'out of luck' and compile
382 # with --hash-style=gnu only.
383 hashstyle-LDFLAGS = -Wl,--hash-style=both
384 LDFLAGS.so += $(hashstyle-LDFLAGS)
385 LDFLAGS-rtld += $(hashstyle-LDFLAGS)
388 # Command to run after every final link (executable or shared object).
389 # This is invoked with $(call after-link,...), so it should operate on
390 # the file $1. This can be set to do some sort of post-processing on
391 # binaries, or to perform some sort of static sanity check.
396 # Command for linking PIE programs with the C library.
398 +link-pie-before-libc = $(CC) -pie -Wl,-O1 -nostdlib -nostartfiles -o $@ \
399 $(sysdep-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \
400 $(combreloc-LDFLAGS) $(relro-LDFLAGS) $(hashstyle-LDFLAGS) \
401 $(addprefix $(csu-objpfx),S$(start-installed-name)) \
402 $(+preinit) $(+prectorS) \
403 $(filter-out $(addprefix $(csu-objpfx),start.o \
404 S$(start-installed-name))\
405 $(+preinit) $(link-extra-libs) \
406 $(common-objpfx)libc% $(+postinit),$^) \
408 +link-pie-after-libc = $(+postctorS) $(+postinit)
410 $(+link-pie-before-libc) $(rtld-LDFLAGS) $(link-libc) $(+link-pie-after-libc)
411 $(call after-link,$@)
413 define +link-pie-tests
414 $(+link-pie-before-libc) $(rtld-tests-LDFLAGS) $(link-libc-tests) \
415 $(+link-pie-after-libc)
416 $(call after-link,$@)
419 # Command for statically linking programs with the C library.
421 +link-static-before-libc = $(CC) -nostdlib -nostartfiles -static -o $@ \
422 $(sysdep-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \
423 $(addprefix $(csu-objpfx),$(static-start-installed-name)) \
424 $(+preinit) $(+prectorT) \
425 $(filter-out $(addprefix $(csu-objpfx),start.o \
426 $(start-installed-name))\
427 $(+preinit) $(link-extra-libs-static) \
428 $(common-objpfx)libc% $(+postinit),$^) \
429 $(link-extra-libs-static)
430 +link-static-after-libc = $(+postctorT) $(+postinit)
432 $(+link-static-before-libc) $(link-libc-static) $(+link-static-after-libc)
433 $(call after-link,$@)
435 define +link-static-tests
436 $(+link-static-before-libc) $(link-libc-static-tests) $(+link-static-after-libc)
437 $(call after-link,$@)
440 # Commands for linking programs with the C library.
442 ifeq (yes,$(build-shared))
443 ifeq (yes,$(build-pie-default))
444 no-pie-ldflag = -no-pie
446 +link-tests = $(+link-pie-tests)
448 +link-before-libc = $(CC) -nostdlib -nostartfiles -o $@ \
449 $(sysdep-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \
450 $(combreloc-LDFLAGS) $(relro-LDFLAGS) $(hashstyle-LDFLAGS) \
451 $(addprefix $(csu-objpfx),$(start-installed-name)) \
452 $(+preinit) $(+prector) \
453 $(filter-out $(addprefix $(csu-objpfx),start.o \
454 $(start-installed-name))\
455 $(+preinit) $(link-extra-libs) \
456 $(common-objpfx)libc% $(+postinit),$^) \
458 +link-after-libc = $(+postctor) $(+postinit)
460 $(+link-before-libc) $(rtld-LDFLAGS) $(link-libc) $(+link-after-libc)
461 $(call after-link,$@)
464 $(+link-before-libc) $(rtld-tests-LDFLAGS) $(link-libc-tests) \
466 $(call after-link,$@)
470 +link = $(+link-static)
471 +link-tests = $(+link-static-tests)
474 ifeq (yes,$(build-shared))
476 rtld-LDFLAGS = -Wl,-dynamic-linker=$(rtlddir)/$(rtld-installed-name)
478 ifndef rtld-tests-LDFLAGS
479 ifeq (yes,$(build-hardcoded-path-in-tests))
480 rtld-tests-LDFLAGS = -Wl,-dynamic-linker=$(elf-objpfx)ld.so
482 rtld-tests-LDFLAGS = $(rtld-LDFLAGS)
487 ifeq (yes,$(build-shared))
488 # We need the versioned name of libc.so in the deps of $(others) et al
489 # so that the symlink to libc.so is created before anything tries to
490 # run the linked programs.
491 link-libc-rpath-link = -Wl,-rpath-link=$(rpath-link)
492 ifeq (yes,$(build-hardcoded-path-in-tests))
493 link-libc-tests-rpath-link = -Wl,-rpath=$(rpath-link)
495 link-libc-tests-rpath-link = $(link-libc-rpath-link)
497 link-libc-before-gnulib = $(common-objpfx)libc.so$(libc.so-version) \
498 $(common-objpfx)$(patsubst %,$(libtype.oS),c) \
499 $(as-needed) $(elf-objpfx)ld.so \
501 link-libc = $(link-libc-rpath-link) $(link-libc-before-gnulib) $(gnulib)
502 link-libc-tests = $(link-libc-tests-rpath-link) \
503 $(link-libc-before-gnulib) $(gnulib-tests)
504 # This is how to find at build-time things that will be installed there.
505 rpath-dirs = math elf dlfcn nss nis rt resolv crypt mathvec
507 $(common-objdir):$(subst $(empty) ,:,$(patsubst ../$(subdir),.,$(rpath-dirs:%=$(common-objpfx)%)))
509 link-libc = $(common-objpfx)libc.a $(otherlibs) $(gnulib) $(common-objpfx)libc.a $(gnulib)
510 link-libc-tests = $(common-objpfx)libc.a $(otherlibs) $(gnulib-tests) $(common-objpfx)libc.a $(gnulib-tests)
514 # Differences in the linkers on the various platforms.
515 LDFLAGS-rpath-ORIGIN = -Wl,-rpath,'$$ORIGIN'
516 LDFLAGS-soname-fname = -Wl,-soname,$(@F)
517 LDFLAGS-rdynamic = -rdynamic
518 LDFLAGS-Bsymbolic = -Bsymbolic
520 # Choose the default search path for the dynamic linker based on
521 # where we will install libraries.
522 ifneq ($(libdir),$(slibdir))
523 default-rpath = $(slibdir):$(libdir)
525 default-rpath = $(libdir)
528 ifndef link-extra-libs
529 link-extra-libs = $(LDLIBS-$(@F))
530 link-extra-libs-static = $(link-extra-libs)
533 # The static libraries.
534 link-libc-static = -Wl,--start-group $(common-objpfx)libc.a $(static-gnulib) -Wl,--end-group
535 link-libc-static-tests = -Wl,--start-group $(common-objpfx)libc.a $(static-gnulib-tests) -Wl,--end-group
537 # How to link against libgcc. Some libgcc functions, such as those
538 # for "long long" arithmetic or software floating point, can always be
539 # built without use of C library headers and do not have any global
540 # state so can safely be linked statically into any executable or
541 # shared library requiring them; these functions are in libgcc.a.
542 # Other functions, relating to exception handling, may require C
543 # library headers to build and it may not be safe to have more than
544 # one copy of them in a process; these functions are only in
545 # libgcc_s.so and libgcc_eh.a.
547 # To avoid circular dependencies when bootstrapping, it is desirable
548 # to avoid use of libgcc_s and libgcc_eh in building glibc. Where any
549 # glibc functionality (in particular, thread cancellation) requires
550 # exception handling, this is implemented through dlopen of libgcc_s
551 # to avoid unnecessary dependencies on libgcc_s by programs not using
552 # that functionality; executables built with glibc do not use
553 # exception handling other than through thread cancellation.
555 # Undefined references to functions from libgcc_eh or libgcc_s may
556 # arise for code built with -fexceptions. In the case of statically
557 # linked programs installed by glibc, unwinding will never actually
558 # occur at runtime and the use of elf/static-stubs.c to resolve these
559 # references is safe. In the case of statically linked test programs
560 # and test programs built with -fexceptions, unwinding may occur in
561 # some cases and it is preferable to link with libgcc_eh or libgcc_s
562 # so that the testing is as similar as possible to how programs will
563 # be built with the installed glibc.
565 # Some architectures have architecture-specific systems for exception
566 # handling that may involve undefined references to
567 # architecture-specific functions. On those architectures,
568 # gnulib-arch and static-gnulib-arch may be defined in sysdeps
569 # makefiles to use additional libraries for linking executables and
570 # shared libraries built by glibc.
572 ifneq ($(have-cc-with-libunwind),yes)
577 libgcc_eh := -Wl,--as-needed -lgcc_s $(libunwind) -Wl,--no-as-needed
579 gnulib = -lgcc $(gnulib-arch)
580 gnulib-tests := -lgcc $(libgcc_eh)
582 # By default, elf/static-stubs.o, instead of -lgcc_eh, is used to
583 # statically link programs. When --disable-shared is used, we use
584 # -lgcc_eh since elf/static-stubs.o isn't sufficient.
585 ifeq (yes,$(build-shared))
586 static-gnulib = -lgcc $(static-gnulib-arch)
588 static-gnulib = -lgcc -lgcc_eh $(static-gnulib-arch)
590 static-gnulib-tests := -lgcc -lgcc_eh $(libunwind)
591 libc.so-gnulib := -lgcc
593 +preinit = $(addprefix $(csu-objpfx),crti.o)
594 +postinit = $(addprefix $(csu-objpfx),crtn.o)
595 +prector = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbegin.o`
596 +postctor = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtend.o`
597 # Variants of the two previous definitions for linking PIE programs.
598 +prectorS = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbeginS.o`
599 +postctorS = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtendS.o`
600 # Variants of the two previous definitions for statically linking programs.
601 +prectorT = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbeginT.o`
602 +postctorT = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtend.o`
603 csu-objpfx = $(common-objpfx)csu/
604 elf-objpfx = $(common-objpfx)elf/
606 # A command that, prepended to the name and arguments of a program,
607 # and run on the build system, causes that program with those
608 # arguments to be run on the host for which the library is built.
612 # Likewise, but the name of the program is preceded by
613 # <variable>=<value> assignments for environment variables.
614 ifndef test-wrapper-env
615 test-wrapper-env = $(test-wrapper) env
617 # Likewise, but the program's environment will be empty except for any
618 # explicit <variable>=<value> assignments preceding the program name.
619 ifndef test-wrapper-env-only
620 test-wrapper-env-only = $(test-wrapper) env -i
623 # Whether to run test programs built for the library's host system.
624 ifndef run-built-tests
625 ifeq (yes|,$(cross-compiling)|$(test-wrapper))
628 run-built-tests = yes
632 # Whether to stop immediately when a test fails. Nonempty means to
633 # stop, empty means not to stop.
634 ifndef stop-on-test-failure
635 stop-on-test-failure =
638 # How to run a program we just linked with our library.
639 # The program binary is assumed to be $(word 2,$^).
640 built-program-file = $(dir $(word 2,$^))$(notdir $(word 2,$^))
641 rtld-prefix = $(elf-objpfx)$(rtld-installed-name) \
643 $(rpath-link)$(patsubst %,:%,$(sysdep-library-path))
644 ifeq (yes,$(build-shared))
646 sysdep-library-path = \
647 $(subst $(empty) ,:,$(strip $(patsubst -Wl$(comma)-rpath-link=%, %,\
648 $(filter -Wl$(comma)-rpath-link=%,\
649 $(sysdep-LDFLAGS)))))
650 # $(run-via-rtld-prefix) is a command that, when prepended to the name
651 # of a program built with the newly built library, produces a command
652 # that, executed on the host for which the library is built, runs that
653 # program. For tests listed in tests-static or xtests-static, it is
655 run-via-rtld-prefix = \
656 $(if $(strip $(filter $(notdir $(built-program-file)), \
657 $(tests-static) $(xtests-static))),, $(rtld-prefix))
659 run-via-rtld-prefix =
661 # $(run-program-env) is the default environment variable settings to
662 # use when running a program built with the newly built library.
663 run-program-env = GCONV_PATH=$(common-objpfx)iconvdata \
664 LOCPATH=$(common-objpfx)localedata LC_ALL=C
665 # $(run-program-prefix) is a command that, when prepended to the name
666 # of a program built with the newly built library, produces a command
667 # that, executed on the build system on which "make" is run, runs that
668 # program. $(run-program-prefix-before-env) and
669 # $(run-program-prefix-after-env) are similar, but separate parts
670 # before and after a list of environment variables.
671 run-program-prefix-before-env = $(test-wrapper-env)
672 run-program-prefix-after-env = $(run-via-rtld-prefix)
673 run-program-prefix = $(run-program-prefix-before-env) $(run-program-env) \
674 $(run-program-prefix-after-env)
675 # $(built-program-cmd) is a command that, executed on the build system
676 # on which "make" is run, runs the newly built program that is the
677 # second dependency of the makefile target in which
678 # $(built-program-cmd) is used. $(built-program-cmd-before-env) and
679 # $(built-program-cmd-after-env) are similar, before and after a list
680 # of environment variables.
681 built-program-cmd-before-env = $(test-wrapper-env)
682 built-program-cmd-after-env = $(run-via-rtld-prefix) $(built-program-file)
683 built-program-cmd = $(built-program-cmd-before-env) $(run-program-env) \
684 $(built-program-cmd-after-env)
685 # $(host-built-program-cmd) is a command that, executed on the host
686 # for which the library is built, runs the newly built program that is
687 # the second dependency of the makefile target in which
688 # $(host-built-program-cmd) is used.
689 host-built-program-cmd = $(run-via-rtld-prefix) $(built-program-file)
695 # $(test-via-rtld-prefix) is a command that, when prepended to the name
696 # of a test program built with the newly built library, produces a command
697 # that, executed on the host for which the library is built, runs that
698 # program. For tests listed in tests-static or xtests-static as well
699 # as when test programs are hardcoded to the newly built libraries, it
702 # $(test-program-prefix) is a command that, when prepended to the name
703 # of a test program built with the newly built library, produces a command
704 # that, executed on the build system on which "make" is run, runs that
705 # test program. $(test-program-prefix-before-env) and
706 # $(test-program-prefix-after-env) are similar, before and after a
707 # list of environment variables.
709 # $(test-program-cmd) is a command that, executed on the build system
710 # on which "make" is run, runs the newly built test program that is the
711 # second dependency of the makefile target in which
712 # $(test-program-cmd) is used. $(test-program-cmd-before-env) and
713 # $(test-program-cmd-after-env) are similar, before and after a list
714 # of environment variables.
716 # $(host-test-program-cmd) is a command that, executed on the host
717 # for which the library is built, runs the newly built test program that
718 # is the second dependency of the makefile target in which
719 # $(host-test-program-cmd) is used.
721 ifeq (yes,$(build-hardcoded-path-in-tests))
722 test-via-rtld-prefix =
723 test-program-prefix-before-env = $(test-wrapper-env)
724 test-program-prefix-after-env =
725 test-program-prefix = $(test-program-prefix-before-env) $(run-program-env) \
726 $(test-program-prefix-after-env)
727 test-program-cmd-before-env = $(test-wrapper-env)
728 test-program-cmd-after-env = $(built-program-file)
729 test-program-cmd = $(test-program-cmd-before-env) $(run-program-env) \
730 $(test-program-cmd-after-env)
731 host-test-program-cmd = $(built-program-file)
733 test-via-rtld-prefix = $(run-via-rtld-prefix)
734 test-program-prefix-before-env = $(run-program-prefix-before-env)
735 test-program-prefix-after-env = $(run-program-prefix-after-env)
736 test-program-prefix = $(run-program-prefix)
737 test-program-cmd-before-env = $(built-program-cmd-before-env)
738 test-program-cmd-after-env = $(built-program-cmd-after-env)
739 test-program-cmd = $(built-program-cmd)
740 host-test-program-cmd = $(host-built-program-cmd)
743 # Extra flags to pass to GCC.
744 ifeq ($(all-warnings),yes)
745 +gccwarn := -Wall -Wwrite-strings -Wcast-qual -Wbad-function-cast -Wmissing-noreturn -Wmissing-prototypes -Wmissing-declarations -Wcomment -Wcomments -Wtrigraphs -Wsign-compare -Wfloat-equal -Wmultichar
747 +gccwarn := -Wall -Wwrite-strings
750 ifeq ($(enable-werror),yes)
753 +gccwarn-c = -Wstrict-prototypes -Wold-style-definition
755 # We do not depend on the address of constants in different files to be
756 # actually different, so allow the compiler to merge them all.
757 +merge-constants = -fmerge-all-constants
759 # We have to assume that glibc functions are called in any rounding
760 # mode and also change the rounding mode in a few functions. So,
761 # disable any optimization that assume default rounding mode.
762 +math-flags = -frounding-math
764 # This is the program that generates makefile dependencies from C source files.
765 # The -MP flag tells GCC >= 3.2 (which we now require) to produce dummy
766 # targets for headers so that removed headers don't break the build.
768 +mkdep = $(CC) -M -MP
771 # The program that makes Emacs-style TAGS files.
774 # The `xgettext' program for producing .pot files from sources.
779 # The `m4' macro processor; this is used by sysdeps/sparc/Makefile (and
780 # perhaps others) to preprocess assembly code in some cases.
783 # To force installation of files even if they are older than the
784 # installed files. This variable is included in the dependency list
785 # of all installation targets.
786 ifeq ($(force-install),yes)
787 +force = force-install
793 #### End of configuration variables.
796 # This tells some versions of GNU make before 3.63 not to export all variables.
799 # We want to echo the commands we're running without
800 # umpteen zillion filenames along with it (we use `...' instead)
801 # but we don't want this echoing done when the user has said
802 # he doesn't want to see commands echoed by using -s.
803 ifneq "$(findstring s,$(MAKEFLAGS))" "" # if -s
804 +cmdecho := echo >/dev/null
809 # These are the flags given to the compiler to tell
810 # it what sort of optimization and/or debugging output to do.
812 # If `CFLAGS' was defined, use that.
814 +cflags := $(filter-out -I%,$(CFLAGS))
818 # If none of the above worked, default to "-g -O".
819 ifeq "$(strip $(+cflags))" ""
820 +cflags := $(default_cflags)
821 endif # $(+cflags) == ""
823 +cflags += $(cflags-cpu) $(+gccwarn) $(+merge-constants) $(+math-flags)
826 # Don't duplicate options if we inherited variables from the parent.
827 +cflags := $(sort $(+cflags))
829 # Each sysdeps directory can contain header files that both will be
830 # used to compile and will be installed. Each can also contain an
831 # include/ subdirectory, whose header files will be used to compile
832 # but will not be installed, and will take precedence over the
833 # installed files. This mirrors the top-level include/ subdirectory.
834 +sysdep-includes := $(foreach dir,$(+sysdep_dirs),\
835 $(addprefix -I,$(wildcard $(dir)/include) $(dir)))
837 # These are flags given to the C compiler to tell it to look for
838 # include files (including ones given in angle brackets) in the parent
839 # library source directory, in the include directory, and in the
841 +includes = -I$(..)include $(if $(subdir),$(objpfx:%/=-I%)) \
842 $(+sysdep-includes) $(includes) \
843 $(patsubst %/,-I%,$(..)) $(libio-include) -I. $(sysincludes)
845 # Since libio has several internal header files, we use a -I instead
846 # of many little headers in the include directory.
847 libio-include = -I$(..)libio
849 # List of non-library modules that we build.
850 built-modules = iconvprogs iconvdata ldconfig lddlibc4 libmemusage \
851 libSegFault libpcprofile librpcsvc locale-programs \
852 memusagestat nonlib nscd extramodules libnldbl
854 in-module = $(subst -,_,$(firstword $(libof-$(basename $(@F))) \
859 # Build ld.so, libc.so and libpthread.so with -ftls-model=initial-exec
860 tls-model = $(if $(filter libpthread rtld \
861 libc,$(in-module)),-ftls-model=initial-exec,)
863 module-cppflags-real = -include $(common-objpfx)libc-modules.h \
864 -DMODULE_NAME=$(in-module)
866 # We don't need libc-modules.h and the MODULE_NAME definition for .v.i
867 # files. These targets don't (and will likely never need to) use the IS_IN
868 # facility. In fact, shlib-versions should not use it because that will
869 # create a circular dependency as libc-modules.h is generated from
871 module-cppflags = $(if $(filter %.v.i,$(@F)),,$(module-cppflags-real))
873 # These are the variables that the implicit compilation rules use.
874 # Note that we can't use -std=* in CPPFLAGS, because it overrides
875 # the implicit -lang-asm and breaks cpp behavior for .S files--notably
876 # it causes cpp to stop predefining __ASSEMBLER__.
877 CPPFLAGS = $(config-extra-cppflags) $(CPPUNDEFS) $(CPPFLAGS-config) \
878 $($(subdir)-CPPFLAGS) \
879 $(+includes) $(defines) $(module-cppflags) \
880 -include $(..)include/libc-symbols.h $(sysdep-CPPFLAGS) \
881 $(CPPFLAGS-$(suffix $@)) \
882 $(foreach lib,$(libof-$(basename $(@F))) \
883 $(libof-$(<F)) $(libof-$(@F)),$(CPPFLAGS-$(lib))) \
884 $(CPPFLAGS-$(<F)) $(CPPFLAGS-$(@F)) $(CPPFLAGS-$(basename $(@F)))
885 override CFLAGS = -std=gnu11 -fgnu89-inline $(config-extra-cflags) \
886 $(filter-out %frame-pointer,$(+cflags)) $(+gccwarn-c) \
887 $(sysdep-CFLAGS) $(CFLAGS-$(suffix $@)) $(CFLAGS-$(<F)) \
888 $(CFLAGS-$(@F)) $(tls-model) \
889 $(foreach lib,$(libof-$(basename $(@F))) \
890 $(libof-$(<F)) $(libof-$(@F)),$(CFLAGS-$(lib)))
891 override CXXFLAGS = $(c++-sysincludes) \
892 $(filter-out %frame-pointer,$(+cflags)) $(sysdep-CFLAGS) \
893 $(CFLAGS-$(suffix $@)) $(CFLAGS-$(<F)) $(CFLAGS-$(@F))
895 # If everything is compiled with -fPIC (implicitly) we must tell this by
896 # defining the PIC symbol.
897 ifeq (yes,$(build-pic-default))
901 # Enable object files for different versions of the library.
902 # Various things use $(object-suffixes) to know what all to make.
903 # The compilation rules use $(CPPFLAGS-${SUFFIX}) and $(CFLAGS-${SUFFIX})
904 # to pass different flags for each flavor.
905 libtypes = $(foreach o,$(object-suffixes-for-libc),$(libtype$o))
906 all-object-suffixes := .o .os .op .og .oS
908 CPPFLAGS-.o = $(pic-default)
909 CFLAGS-.o = $(filter %frame-pointer,$(+cflags))
911 object-suffixes += .o
912 ifeq (yes,$(build-shared))
913 # Under --enable-shared, we will build a shared library of PIC objects.
914 # The PIC object files are named foo.os.
915 object-suffixes += .os
916 CPPFLAGS-.os = -DPIC -DSHARED
917 CFLAGS-.os = $(filter %frame-pointer,$(+cflags)) $(pic-ccflag)
918 libtype.os := lib%_pic.a
919 # This can be changed by a sysdep makefile
921 # This one should always stay like this unless there is a very good reason.
924 # This can be changed by a sysdep makefile
926 # This one should always stay like this unless there is a very good reason.
928 ifeq (yes,$(build-profile))
929 # Under --enable-profile, we will build a static library of profiled objects.
930 # The profiled object files are named foo.op.
931 object-suffixes += .op
932 CPPFLAGS-.op = -DPROF $(pic-default)
934 libtype.op = lib%_p.a
937 # Convenience variable for when we want to treat shared-library cases
938 # differently from the rest.
939 object-suffixes-noshared := $(filter-out .os,$(object-suffixes))
941 object-suffixes-for-libc := $(object-suffixes)
943 ifeq (yes,$(build-shared))
944 # Build special library that contains the static-only routines for libc.
945 object-suffixes-for-libc += .oS
947 # Must build the routines as PIC, though, because they can end up in (users')
948 # shared objects. We don't want to use CFLAGS-os because users may, for
949 # example, make that processor-specific.
950 CFLAGS-.oS = $(CFLAGS-.o) $(PIC-ccflag)
951 CPPFLAGS-.oS = $(CPPFLAGS-.o) -DPIC -DLIBC_NONSHARED=1
952 libtype.oS = lib%_nonshared.a
955 # The assembler can generate debug information too.
957 ASFLAGS := $(filter -g% -fdebug-prefix-map=%,$(CFLAGS))
959 ASFLAGS += -Werror=undef $(ASFLAGS-config) $(asflags-cpu)
965 move-if-change = $(SHELL) $(..)scripts/move-if-change
967 -include $(common-objpfx)sysd-sorted
968 subdirs = $(sorted-subdirs)
969 subdir-srcdirs = $(foreach dir,$(subdirs),\
970 $(firstword $($(dir)-srcdir) $(..)$(dir)))
972 # This is a pair of implicit rules to preprocess a file with # comments,
973 # %ifdef et al, based on config.h settings or other %include'd files.
974 # We use chained rules instead of a pipeline here so that we can properly
975 # check the exit status of cpp rather than using its bad output when there
976 # is a preprocessing error. Another rule should depend on the output file
977 # `FOO.v', and along with that `FOO.v.i' should be given dependencies
978 # listing both its input files, and any header files that it may reference
980 %.v.i: $(common-objpfx)config.h $(..)Makeconfig
981 sed '/^[ ]*%/!s/#.*$$//;/^[ ]*$$/d;s/^[ ]*%/#/' \
982 $(filter-out FORCE %.h $(..)Makeconfig,$^) \
983 | $(CC) -E -undef $(CPPFLAGS) -x assembler-with-cpp - \
987 sed '/^[ ]*#/d;/^[ ]*$$/d' $< > $@T
990 ifeq (yes, $(build-shared))
992 # To generate a header to support more than one ABI for different
993 # architecture variants, the CPU/Makefile defines abi-variants to be a
994 # list of names for those variants (e.g. 32 64), and, for each variant,
995 # defines abi-$(variant)-condition to be the condition for those options
996 # to use in a C #if condition. abi-includes may be defined to a list of
997 # headers to include in the generated header, if the default does not
998 # suffice. default-abi is defined to be the ABI for the current glibc
1002 abi-includes := bits/wordsize.h
1005 # Process the shlib-versions file, which tells us what shared library
1006 # version numbers to use when we install shared objects on this system.
1007 # We need to wait until $(subdirs) is complete.
1008 ifeq ($(sysd-sorted-done),t)
1009 -include $(common-objpfx)soversions.mk
1010 ifndef avoid-generated
1011 # This lets add-ons give more-specific matches that override defaults
1012 # in the top-level file.
1013 $(common-objpfx)shlib-versions.v.i: \
1014 $(wildcard $(+sysdep_dirs:=/shlib-versions) \
1015 $(subdir-srcdirs:=/shlib-versions)) \
1018 $(common-objpfx)soversions.i: $(..)scripts/soversions.awk \
1019 $(common-objpfx)shlib-versions.v
1022 $(common-objpfx)soversions.mk: $(common-objpfx)soversions.i $(..)Makeconfig
1023 (while read which lib number setname; do \
1024 eval seen_$$which=1; \
1025 test x"$$which" = xDEFAULT || continue; \
1027 [0-9]*) echo "$$lib.so-version=.$$number"; \
1028 echo "all-sonames+=$$lib=$$lib.so\$$($$lib.so-version)";;\
1029 *) echo "$$lib.so-version=$$number"; \
1030 echo "all-sonames+=$$lib=\$$($$lib.so-version)";;\
1033 echo soversions.mk-done = t;) < $< > $@T; exit 0
1038 postclean-generated += soversions.mk soversions.i \
1039 shlib-versions.v shlib-versions.v.i
1041 before-compile += $(common-objpfx)libc-modules.h
1042 ifeq ($(soversions.mk-done),t)
1043 # Generate a header with macro definitions for use with the IS_IN macro.
1044 # These are the possible values for the MODULE_NAME macro defined when building
1045 # sources, to identify which module the translation unit is going to be built
1047 $(common-objpfx)libc-modules.h: $(common-objpfx)libc-modules.stmp; @:
1048 $(common-objpfx)libc-modules.stmp: $(..)scripts/gen-libc-modules.awk \
1049 $(common-objpfx)soversions.i
1050 $(AWK) -v buildlist="$(subst -,_,$(built-modules))" -f $^ > ${@:stmp=T}
1051 $(move-if-change) ${@:stmp=T} ${@:stmp=h}
1056 common-generated += libc-modules.h libc-modules.stmp
1058 # The name under which the run-time dynamic linker is installed.
1059 # We are currently going for the convention that `/lib/ld.so.1'
1060 # names the SVR4/ELF ABI-compliant dynamic linker.
1061 ifndef rtld-installed-name
1063 rtld-installed-name = $(ld.so-version)
1065 rtld-installed-name = ld.so.1
1069 ifndef rtld-version-installed-name
1070 rtld-version-installed-name = ld-$(version).so
1073 endif # build-shared
1076 ifeq ($(build-shared),yes)
1077 libdl = $(common-objpfx)dlfcn/libdl.so$(libdl.so-version)
1079 libdl = $(common-objpfx)dlfcn/libdl.a
1082 ifeq ($(build-shared),yes)
1083 libm = $(common-objpfx)math/libm.so$(libm.so-version)
1084 libmvec = $(common-objpfx)mathvec/libmvec.so$(libmvec.so-version)
1086 libm = $(common-objpfx)math/libm.a
1087 libmvec = $(common-objpfx)mathvec/libmvec.a
1090 # These are the subdirectories containing the library source. The order
1091 # is more or less arbitrary. The sorting step will take care of the
1093 all-subdirs = csu assert ctype locale intl catgets math setjmp signal \
1094 stdlib stdio-common libio malloc string wcsmbs time dirent \
1095 grp pwd posix io termios resource misc socket sysvipc gmon \
1096 gnulib iconv iconvdata wctype manual shadow gshadow po argp \
1097 crypt localedata timezone rt conform debug mathvec \
1098 $(add-on-subdirs) dlfcn elf
1100 ifndef avoid-generated
1101 # sysd-sorted itself will contain rules making the sysd-sorted target
1102 # depend on Depend files. But if you just added a Depend file to an
1103 # existing directory not in all-subdirs, then sysd-sorted needs to
1104 # be regenerated, so it depends on existing $(sorted-subdirs:=/Depend) files.
1105 all-Depend-files := $(wildcard $(sort \
1106 $(foreach dir,$(all-subdirs),\
1107 $(firstword $($(dir)-srcdir) \
1108 $(..)$(dir))/Depend) \
1109 $(sorted-subdirs:=/Depend)))
1110 $(common-objpfx)sysd-sorted: $(..)scripts/gen-sorted.awk \
1111 $(common-objpfx)config.make $(..)Makeconfig \
1112 $(wildcard $(sysdirs:=/Subdirs)) \
1115 -v subdirs='$(all-subdirs)' \
1117 $(filter %/Subdirs %/Depend,$^) > $@-tmp
1119 $(all-Depend-files): ;
1122 # This gives partial TARGET:SOURCE pattern pairs to have rules
1123 # emitted into sysd-rules. A sysdeps Makeconfig fragment can
1124 # add its own special object file prefix to this list with e.g. foo-%:%
1125 # to have foo-*.? compiled from *.? using $(foo-CPPFLAGS).
1126 sysd-rules-patterns := %:% rtld-%:rtld-% rtld-%:% m_%:s_%
1128 # Let sysdeps/ subdirs contain a Makeconfig fragment for us to include here.
1129 sysdep-makeconfigs := $(wildcard $(+sysdep_dirs:=/Makeconfig))
1130 ifneq (,$(sysdep-makeconfigs))
1131 include $(sysdep-makeconfigs)
1134 # Compute just the target patterns. Makeconfig has set sysd-rules-patterns.
1135 sysd-rules-targets := $(sort $(foreach p,$(sysd-rules-patterns),\
1136 $(firstword $(subst :, ,$p))))
1138 # A sysdeps Makeconfig fragment may set libc-reentrant to yes.
1139 ifeq (yes,$(libc-reentrant))
1140 defines += -D_LIBC_REENTRANT
1142 libio-mtsafe = -D_IO_MTSAFE_IO
1145 # The name to give to a test in test results summaries.
1146 test-name = $(strip $(patsubst %.out, %, $(patsubst $(common-objpfx)%, %, $@)))
1148 # Likewise, in XFAIL variable names.
1149 test-xfail-name = $(strip $(patsubst %.out, %, $(patsubst $(objpfx)%, %, $@)))
1151 # Command to output a test status line (such as PASS: test-name). If
1152 # test-xfail-$(test-xfail-name) has a nonempty value, the status will be
1153 # XPASS or XFAIL rather than PASS or FAIL.
1154 evaluate-test = $(..)scripts/evaluate-test.sh $(test-name) $$? \
1155 $(if $(test-xfail-$(test-xfail-name)),true,false) \
1156 $(if $(stop-on-test-failure),true,false) \
1157 > $(common-objpfx)$(test-name).test-result
1159 endif # Makeconfig not yet included