5 Usage: $0 [OPTION]... [VAR=VALUE]... [TARGET]
7 To assign environment variables (e.g., CC, CFLAGS...), specify them as
8 VAR=VALUE. See below for descriptions of some of the useful variables.
10 Defaults for the options are specified in brackets.
13 --srcdir=DIR source directory [detected]
15 Installation directories:
16 --prefix=PREFIX main installation prefix [/usr/local/musl]
17 --exec-prefix=EPREFIX installation prefix for executable files [PREFIX]
19 Fine tuning of the installation directories:
20 --bindir=DIR user executables [EPREFIX/bin]
21 --libdir=DIR library files for the linker [PREFIX/lib]
22 --includedir=DIR include files for the C compiler [PREFIX/include]
23 --syslibdir=DIR location for the dynamic linker [/lib]
26 --target=TARGET configure to run on target TARGET [detected]
27 --host=HOST same as --target
28 --build=BUILD build system type; used only to infer cross-compiling
31 --enable-optimize=... optimize listed components for speed over size [auto]
32 --enable-debug build with debugging information [disabled]
33 --enable-warnings build with recommended warnings flags [disabled]
34 --enable-visibility use global visibility options to optimize PIC [no]
35 --enable-wrapper=... build given musl toolchain wrapper [auto]
36 --disable-shared inhibit building shared library [enabled]
37 --disable-static inhibit building static library [enabled]
39 Some influential environment variables:
40 CC C compiler command [detected]
41 CFLAGS C compiler flags [-Os -pipe ...]
42 CROSS_COMPILE prefix for cross compiler and tools [none]
43 LIBCC compiler runtime library [detected]
45 Use these variables to override the choices made by configure.
54 tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
57 printf %s
\\n
"$1" |
sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
59 echo () { printf "%s\n" "$*" ; }
60 fail
() { echo "$*" ; exit 1 ; }
61 fnmatch
() { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
62 cmdexists
() { type "$1" >/dev
/null
2>&1 ; }
63 trycc
() { test -z "$CC" && cmdexists
"$1" && CC
=$1 ; }
66 while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
70 printf "checking preprocessor condition %s... " "$1"
71 echo "typedef int x;" > "$tmpc"
72 echo "#if $1" >> "$tmpc"
73 echo "#error yes" >> "$tmpc"
74 echo "#endif" >> "$tmpc"
75 if $CC $2 -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
85 printf "checking whether compiler accepts %s... " "$2"
86 echo "typedef int x;" > "$tmpc"
87 if $CC $CFLAGS_TRY $2 -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
89 eval "$1=\"\${$1} \$2\""
99 printf "checking whether linker accepts %s... " "$2"
100 echo "typedef int x;" > "$tmpc"
101 if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
103 eval "$1=\"\${$1} \$2\""
114 # Beginning of actual script
125 prefix
=/usr
/local
/musl
126 exec_prefix
='$(prefix)'
127 bindir
='$(exec_prefix)/bin'
128 libdir
='$(prefix)/lib'
129 includedir
='$(prefix)/include'
148 --srcdir=*) srcdir
=${arg#*=} ;;
149 --prefix=*) prefix
=${arg#*=} ;;
150 --exec-prefix=*) exec_prefix
=${arg#*=} ;;
151 --bindir=*) bindir
=${arg#*=} ;;
152 --libdir=*) libdir
=${arg#*=} ;;
153 --includedir=*) includedir
=${arg#*=} ;;
154 --syslibdir=*) syslibdir
=${arg#*=} ;;
155 --enable-shared|
--enable-shared=yes) shared
=yes ;;
156 --disable-shared|
--enable-shared=no
) shared
=no
;;
157 --enable-static|
--enable-static=yes) static
=yes ;;
158 --disable-static|
--enable-static=no
) static
=no
;;
159 --enable-optimize) optimize
=yes ;;
160 --enable-optimize=*) optimize
=${arg#*=} ;;
161 --disable-optimize) optimize
=no
;;
162 --enable-debug|
--enable-debug=yes) debug
=yes ;;
163 --disable-debug|
--enable-debug=no
) debug
=no
;;
164 --enable-warnings|
--enable-warnings=yes) warnings
=yes ;;
165 --disable-warnings|
--enable-warnings=no
) warnings
=no
;;
166 --enable-visibility=auto
) visibility
=auto
;;
167 --enable-visibility|
--enable-visibility=yes) visibility
=yes ;;
168 --disable-visibility|
--enable-visibility=no
) visibility
=no
;;
169 --enable-wrapper|
--enable-wrapper=yes) wrapper
=detect
;;
170 --enable-wrapper=all
) wrapper
=yes ; gcc_wrapper
=yes ; clang_wrapper
=yes ;;
171 --enable-wrapper=gcc
) wrapper
=yes ; gcc_wrapper
=yes ;;
172 --enable-wrapper=clang
) wrapper
=yes ; clang_wrapper
=yes ;;
173 --disable-wrapper|
--enable-wrapper=no
) wrapper
=no
;;
174 --enable-gcc-wrapper|
--enable-gcc-wrapper=yes) wrapper
=yes ; gcc_wrapper
=yes ;;
175 --disable-gcc-wrapper|
--enable-gcc-wrapper=no
) wrapper
=no
;;
176 --enable-*|
--disable-*|
--with-*|
--without-*|
--*dir
=*) ;;
177 --host=*|
--target=*) target
=${arg#*=} ;;
178 --build=*) build
=${arg#*=} ;;
179 -* ) echo "$0: unknown option $arg" ;;
180 CC
=*) CC
=${arg#*=} ;;
181 CFLAGS
=*) CFLAGS
=${arg#*=} ;;
182 CPPFLAGS
=*) CPPFLAGS
=${arg#*=} ;;
183 LDFLAGS
=*) LDFLAGS
=${arg#*=} ;;
184 CROSS_COMPILE
=*) CROSS_COMPILE
=${arg#*=} ;;
185 LIBCC
=*) LIBCC
=${arg#*=} ;;
187 *) build
=$arg ; target
=$arg ;;
191 for i
in srcdir prefix exec_prefix bindir libdir includedir syslibdir
; do
196 # Get the source dir for out-of-tree builds
198 if test -z "$srcdir" ; then
199 srcdir
="${0%/configure}"
202 abs_builddir
="$(pwd)" || fail
"$0: cannot determine working directory"
203 abs_srcdir
="$(cd $srcdir && pwd)" || fail
"$0: invalid source directory $srcdir"
204 test "$abs_srcdir" = "$abs_builddir" && srcdir
=.
205 test "$srcdir" != "." -a -f Makefile
-a ! -h Makefile
&& fail
"$0: Makefile already exists in the working directory"
208 # Get a temp filename we can use
212 while : ; do i
=$
(($i+1))
213 tmpc
="./conf$$-$PPID-$i.c"
214 2>|
/dev
/null
> "$tmpc" && break
215 test "$i" -gt 50 && fail
"$0: cannot create temporary file $tmpc"
218 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
221 # Check whether we are cross-compiling, and set a default
222 # CROSS_COMPILE prefix if none was provided.
225 test "$target" != "$build" && \
226 test -z "$CROSS_COMPILE" && \
227 CROSS_COMPILE
="$target-"
230 # Find a C compiler to use
232 printf "checking for C compiler... "
233 trycc
${CROSS_COMPILE}gcc
234 trycc
${CROSS_COMPILE}c99
235 trycc
${CROSS_COMPILE}cc
237 test -n "$CC" ||
{ echo "$0: cannot find a C compiler" ; exit 1 ; }
239 printf "checking whether C compiler works... "
240 echo "typedef int x;" > "$tmpc"
241 if output
=$
($CC $CPPFLAGS $CFLAGS -c -o /dev
/null
"$tmpc" 2>&1) ; then
244 printf "no; compiler output follows:\n%s\n" "$output"
249 # Figure out options to force errors on unknown flags.
251 tryflag CFLAGS_TRY
-Werror=unknown-warning-option
252 tryflag CFLAGS_TRY
-Werror=unused-command-line-argument
253 tryflag CFLAGS_TRY
-Werror=ignored-optimization-argument
254 tryldflag LDFLAGS_TRY
-Werror=unknown-warning-option
255 tryldflag LDFLAGS_TRY
-Werror=unused-command-line-argument
258 # Need to know if the compiler is gcc or clang to decide which toolchain
261 printf "checking for C compiler family... "
262 cc_ver
="$(LC_ALL=C $CC -v 2>&1)"
264 if fnmatch
'*gcc\ version*' "$cc_ver" ; then
266 elif fnmatch
'*clang\ version*' "$cc_ver" ; then
272 # Figure out toolchain wrapper to build
274 if test "$wrapper" = auto
-o "$wrapper" = detect
; then
275 echo "#include <stdlib.h>" > "$tmpc"
276 echo "#if ! __GLIBC__" >> "$tmpc"
277 echo "#error no" >> "$tmpc"
278 echo "#endif" >> "$tmpc"
279 printf "checking for toolchain wrapper to build... "
280 if test "$wrapper" = auto
&& ! $CC -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
282 elif test "$cc_family" = gcc
; then
285 elif test "$cc_family" = clang
; then
290 if test "$wrapper" = detect
; then
291 fail
"$0: could not find an appropriate toolchain wrapper"
296 if test "$gcc_wrapper" = yes ; then
297 tools
="$tools obj/musl-gcc"
298 tool_libs
="$tool_libs lib/musl-gcc.specs"
300 if test "$clang_wrapper" = yes ; then
301 tools
="$tools obj/musl-clang obj/ld.musl-clang"
305 # Find the target architecture
307 printf "checking target system type... "
308 test -n "$target" || target
=$
($CC -dumpmachine 2>/dev
/null
) || target
=unknown
309 printf "%s\n" "$target"
312 # Convert to just ARCH
315 # Catch these early to simplify matching for 32-bit archs
317 aarch64
*) ARCH
=aarch64
;;
318 i?
86-nt32*) ARCH
=nt32
;;
320 x86_64-x32
*|x32
*|x86_64
*x32
) ARCH
=x32
;;
321 x86_64-nt64
*) ARCH
=nt64
;;
322 x86_64
*) ARCH
=x86_64
;;
323 mips64
*|mipsisa64
*) ARCH
=mips64
;;
325 microblaze
*) ARCH
=microblaze
;;
327 powerpc64
*) ARCH
=powerpc64
;;
328 powerpc
*) ARCH
=powerpc
;;
329 sh
[1-9bel-]*|sh|superh
*) ARCH
=sh
;;
330 s390x
*) ARCH
=s390x
;;
331 unknown
) fail
"$0: unable to detect target arch; try $0 --target=..." ;;
332 *) fail
"$0: unknown or unsupported target \"$target\"" ;;
336 # Try to get a conforming C99 freestanding environment
338 tryflag CFLAGS_C99FSE
-std=c99
339 tryflag CFLAGS_C99FSE
-nostdinc
340 tryflag CFLAGS_C99FSE
-ffreestanding \
341 || tryflag CFLAGS_C99FSE
-fno-builtin
342 tryflag CFLAGS_C99FSE
-fexcess-precision=standard \
343 ||
{ test "$ARCH" = i386
&& tryflag CFLAGS_C99FSE
-ffloat-store ; }
344 tryflag CFLAGS_C99FSE
-frounding-math
347 # We may use the may_alias attribute if __GNUC__ is defined, so
348 # if the compiler defines __GNUC__ but does not provide it,
349 # it must be defined away as part of the CFLAGS.
351 printf "checking whether compiler needs attribute((may_alias)) suppression... "
355 __attribute__((__may_alias__))
359 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
360 -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
364 CFLAGS_C99FSE
="$CFLAGS_C99FSE -D__may_alias__="
368 # The GNU toolchain defaults to assuming unmarked files need an
369 # executable stack, potentially exposing vulnerabilities in programs
370 # linked with such object files. Fix this.
372 tryflag CFLAGS_C99FSE
-Wa,--noexecstack
375 # Check for options to disable stack protector, which needs to be
376 # disabled for a few early-bootstrap translation units. If not found,
377 # this is not an error; we assume the toolchain does not do ssp.
379 tryflag CFLAGS_NOSSP
-fno-stack-protector
382 # Check for options that may be needed to prevent the compiler from
383 # generating self-referential versions of memcpy,, memmove, memcmp,
384 # and memset. Really, we should add a check to determine if this
385 # option is sufficient, and if not, add a macro to cripple these
386 # functions with volatile...
388 tryflag CFLAGS_MEMOPS
-fno-tree-loop-distribute-patterns
391 # Enable debugging if requessted.
393 test "$debug" = yes && CFLAGS_AUTO
=-g
396 # Preprocess asm files to add extra debugging information if debug is
397 # enabled, our assembler supports the needed directives, and the
398 # preprocessing script has been written for our architecture.
400 printf "checking whether we should preprocess assembly to add debugging information... "
401 if fnmatch
'-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" &&
402 test -f "tools/add-cfi.$ARCH.awk" &&
403 printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" |
$CC -g -x assembler
-c -o /dev
/null
2>/dev
/null
-
409 printf "%s\n" "$ADD_CFI"
412 # Possibly add a -O option to CFLAGS and select modules to optimize with
413 # -O3 based on the status of --enable-optimize and provided CFLAGS.
415 printf "checking for optimization settings... "
418 if fnmatch
'-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
419 printf "using provided CFLAGS\n" ;optimize
=no
421 printf "using defaults\n" ; optimize
=yes
424 xsize|xnone
) printf "minimize size\n" ; optimize
=size
;;
425 xno|x
) printf "disabled\n" ; optimize
=no
;;
426 *) printf "custom\n" ;;
429 test "$optimize" = no || tryflag CFLAGS_AUTO
-Os || tryflag CFLAGS_AUTO
-O2
430 test "$optimize" = yes && optimize
="internal,malloc,string"
432 if fnmatch
'no|size' "$optimize" ; then :
434 printf "components to be optimized for speed:"
435 while test "$optimize" ; do
437 *,*) this
=${optimize%%,*} optimize
=${optimize#*,} ;;
438 *) this
=$optimize optimize
=
443 */*) this
=$this*.c
;;
446 OPTIMIZE_GLOBS
="$OPTIMIZE_GLOBS $this"
448 OPTIMIZE_GLOBS
=${OPTIMIZE_GLOBS# }
453 tryflag CFLAGS_AUTO
-pipe
456 # If debugging is disabled, omit frame pointer. Modern GCC does this
457 # anyway on most archs even when debugging is enabled since the frame
458 # pointer is no longer needed for debugging.
460 if fnmatch
'-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
462 tryflag CFLAGS_AUTO
-fomit-frame-pointer
466 # Modern GCC wants to put DWARF tables (used for debugging and
467 # unwinding) in the loaded part of the program where they are
468 # unstrippable. These options force them back to debug sections (and
469 # cause them not to get generated at all if debugging is off).
471 tryflag CFLAGS_AUTO
-fno-unwind-tables
472 tryflag CFLAGS_AUTO
-fno-asynchronous-unwind-tables
475 # Attempt to put each function and each data object in its own
476 # section. This both allows additional size optimizations at link
477 # time and works around a dangerous class of compiler/assembler bugs
478 # whereby relative address expressions are constant-folded by the
479 # assembler even when one or more of the symbols involved is
480 # replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc.
482 tryflag CFLAGS_AUTO
-ffunction-sections
483 tryflag CFLAGS_AUTO
-fdata-sections
486 # On x86, make sure we don't have incompatible instruction set
487 # extensions enabled by default. This is bad for making static binaries.
488 # We cheat and use i486 rather than i386 because i386 really does not
489 # work anyway (issues with atomic ops).
490 # Some build environments pass -march and -mtune options via CC, so
491 # check both CC and CFLAGS.
493 if test "$ARCH" = "i386" ; then
494 fnmatch
'-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO
-march=i486
495 fnmatch
'-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO
-mtune=generic
499 # Even with -std=c99, gcc accepts some constructs which are constraint
500 # violations. We want to treat these as errors regardless of whether
501 # other purely stylistic warnings are enabled -- especially implicit
502 # function declarations, which are a dangerous programming error.
504 tryflag CFLAGS_AUTO
-Werror=implicit-function-declaration
505 tryflag CFLAGS_AUTO
-Werror=implicit-int
506 tryflag CFLAGS_AUTO
-Werror=pointer-sign
507 tryflag CFLAGS_AUTO
-Werror=pointer-arith
510 # GCC ignores unused arguements by default, but Clang needs this extra
511 # parameter to stop printing warnings about LDFLAGS passed during
512 # compiling stage and CFLAGS passed during linking stage.
514 tryflag CFLAGS_AUTO
-Qunused-arguments
516 if test "x$warnings" = xyes
; then
517 tryflag CFLAGS_AUTO
-Wall
518 tryflag CFLAGS_AUTO
-Wno-parentheses
519 tryflag CFLAGS_AUTO
-Wno-uninitialized
520 tryflag CFLAGS_AUTO
-Wno-missing-braces
521 tryflag CFLAGS_AUTO
-Wno-unused-value
522 tryflag CFLAGS_AUTO
-Wno-unused-but-set-variable
523 tryflag CFLAGS_AUTO
-Wno-unknown-pragmas
524 tryflag CFLAGS_AUTO
-Wno-pointer-to-int-cast
527 if test "x$visibility" = xauto
; then
528 # This test checks toolchain support for several things:
529 # - the -include option
530 # - the attributes/pragmas used in vis.h
531 # - linking code that takes the address of protected symbols
532 # - gcc 3.x bug that wrongly claims declarations mismatch
533 printf "checking whether global visibility preinclude works... "
535 __attribute__((__visibility__("default")))
536 extern struct a *const x;
542 int bar(void) { fp = foo; return foo(); }
544 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
545 -DSHARED -fPIC -I$srcdir/src
/internal
-include vis.h \
546 -nostdlib -shared -Wl,-Bsymbolic-functions \
547 -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
552 printf "%s\n" "$visibility"
555 if test "x$visibility" = xyes
; then
556 CFLAGS_AUTO
="$CFLAGS_AUTO -include vis.h"
557 CFLAGS_AUTO
="${CFLAGS_AUTO# }"
560 # Determine if the compiler produces position-independent code (PIC)
561 # by default. If so, we don't need to compile separate object files
562 # for libc.a and libc.so.
563 if trycppif __PIC__
"$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
569 # Reduce space lost to padding for alignment purposes by sorting data
570 # objects according to their alignment reqirements. This approximates
572 tryldflag LDFLAGS_AUTO
-Wl,--sort-section,alignment
573 tryldflag LDFLAGS_AUTO
-Wl,--sort-common
575 # When linking shared library, drop dummy weak definitions that were
576 # replaced by strong definitions from other translation units.
577 tryldflag LDFLAGS_AUTO
-Wl,--gc-sections
579 # Some patched GCC builds have these defaults messed up...
580 tryldflag LDFLAGS_AUTO
-Wl,--hash-style=both
582 # Prevent linking if there are undefined symbols; if any exist,
583 # libc.so will crash at runtime during relocation processing.
584 # The common way this can happen is failure to link the compiler
585 # runtime library; implementation error is also a possibility.
586 tryldflag LDFLAGS_AUTO
-Wl,--no-undefined
588 # Avoid exporting symbols from compiler runtime libraries. They
589 # should be hidden anyway, but some toolchains including old gcc
590 # versions built without shared library support and pcc are broken.
591 tryldflag LDFLAGS_AUTO
-Wl,--exclude-libs=ALL
593 # Linking with -Bsymbolic-functions is no longer mandatory for
594 # the dynamic linker to work, but enable it if it works as
595 # a linking optimization.
596 tryldflag LDFLAGS_AUTO
-Wl,-Bsymbolic-functions
598 # Find compiler runtime library
599 test -z "$LIBCC" && tryldflag LIBCC
-lgcc && tryldflag LIBCC
-lgcc_eh
600 test -z "$LIBCC" && tryldflag LIBCC
-lcompiler_rt
601 test -z "$LIBCC" && try_libcc
=`$CC -print-libgcc-file-name 2>/dev/null` \
602 && tryldflag LIBCC
"$try_libcc"
603 test -z "$LIBCC" && try_libcc
=`$CC -print-file-name=libpcc.a 2>/dev/null` \
604 && tryldflag LIBCC
"$try_libcc"
605 printf "using compiler runtime libraries: %s\n" "$LIBCC"
607 # Figure out arch variants for archs with variants
609 t
="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
611 if test "$ARCH" = "x86_64" ; then
612 trycppif __ILP32__
"$t" && ARCH
=x32
615 if test "$ARCH" = "arm" ; then
616 if trycppif __thumb2__
"$t" ; then
617 tryflag CFLAGS_AUTO
-Wa,-mimplicit-it=always
618 tryflag CFLAGS_AUTO
-Wa,-mthumb
620 trycppif __ARMEB__
"$t" && SUBARCH
=${SUBARCH}eb
621 trycppif __ARM_PCS_VFP
"$t" && SUBARCH
=${SUBARCH}hf
622 # Versions of clang up until at least 3.8 have the wrong constraint codes
623 # for floating point operands to inline asm. Detect this so the affected
624 # source files can just disable the asm.
625 if test "$cc_family" = clang
; then
626 printf "checking whether clang's vfp asm constraints work... "
627 echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc"
628 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
632 CFLAGS_AUTO
="$CFLAGS_AUTO -DBROKEN_VFP_ASM"
633 CFLAGS_AUTO
="${CFLAGS_AUTO# }"
638 if test "$ARCH" = "aarch64" ; then
639 trycppif __AARCH64EB__
"$t" && SUBARCH
=${SUBARCH}_be
642 if test "$ARCH" = "mips" ; then
643 trycppif
"__mips_isa_rev >= 6" "$t" && SUBARCH
=${SUBARCH}r6
644 trycppif
"_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH
=${SUBARCH}el
645 trycppif __mips_soft_float
"$t" && SUBARCH
=${SUBARCH}-sf
648 if test "$ARCH" = "mips64" ; then
649 trycppif
"_MIPS_SIM != _ABI64" "$t" && ARCH
=mipsn32
650 trycppif
"__mips_isa_rev >= 6" "$t" && SUBARCH
=${SUBARCH}r6
651 trycppif
"_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH
=${SUBARCH}el
652 trycppif __mips_soft_float
"$t" && SUBARCH
=${SUBARCH}-sf
655 if test "$ARCH" = "powerpc" ; then
656 trycppif
"__NO_FPRS__ && !_SOFT_FLOAT" "$t" && fail \
657 "$0: error: compiler's floating point configuration is unsupported"
658 trycppif _SOFT_FLOAT
"$t" && SUBARCH
=${SUBARCH}-sf
661 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__
"$t" \
662 && SUBARCH
=${SUBARCH}el
664 if test "$ARCH" = "powerpc64" ; then
665 trycppif
"_CALL_ELF == 2" "$t" || fail
"$0: error: unsupported powerpc64 ABI"
666 trycppif __LITTLE_ENDIAN__
"$t" && SUBARCH
=${SUBARCH}le
667 trycppif _SOFT_FLOAT
"$t" && fail
"$0: error: soft-float not supported on powerpc64"
670 if test "$ARCH" = "sh" ; then
671 tryflag CFLAGS_AUTO
-Wa,--isa=any
672 trycppif __BIG_ENDIAN__
"$t" && SUBARCH
=${SUBARCH}eb
673 if trycppif
"__SH_FPU_ANY__ || __SH4__" "$t" ; then
674 # Some sh configurations are broken and replace double with float
675 # rather than using softfloat when the fpu is present but only
676 # supports single precision. Reject them.
677 printf "checking whether compiler's double type is IEEE double... "
678 echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
679 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
683 fail
"$0: error: compiler's floating point configuration is unsupported"
686 SUBARCH
=${SUBARCH}-nofpu
688 if trycppif __SH_FDPIC__
"$t" ; then
689 SUBARCH
=${SUBARCH}-fdpic
694 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
696 case "$ARCH$SUBARCH" in
697 arm
) ASMSUBARCH
=el
;;
698 *) ASMSUBARCH
=$SUBARCH ;;
702 # Some archs (powerpc) have different possible long double formats
703 # that the compiler can be configured for. The logic for whether this
704 # is supported is in bits/float.h; in general, it is not. We need to
705 # check for mismatches here or code in printf, strotd, and scanf will
706 # be dangerously incorrect because it depends on (1) the macros being
707 # correct, and (2) IEEE semantics.
709 printf "checking whether compiler's long double definition matches float.h... "
710 echo '#include <float.h>' > "$tmpc"
711 echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc"
712 echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc"
713 if $CC $CFLAGS_C99FSE \
714 -I$srcdir/arch
/$ARCH -I$srcdir/arch
/generic
-I$srcdir/include \
715 $CPPFLAGS $CFLAGS -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
719 fail
"$0: error: unsupported long double type"
723 # Some build systems globally pass in broken CFLAGS like -ffast-math
724 # for all packages. On recent GCC we can detect this and error out
725 # early rather than producing a seriously-broken math library.
727 if trycppif
"__FAST_MATH__" \
728 "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
729 fail
"$0: error: compiler has broken floating point; check CFLAGS"
732 printf "creating config.mak... "
734 cmdline
=$
(quote
"$0")
735 for i
; do cmdline
="$cmdline $(quote "$i")" ; done
737 exec 3>&1 1>config.mak
741 # This version of config.mak was generated by:
743 # Any changes made here will be lost if configure is re-run
746 ASMSUBARCH = $ASMSUBARCH
749 exec_prefix = $exec_prefix
752 includedir = $includedir
753 syslibdir = $syslibdir
756 CFLAGS_AUTO = $CFLAGS_AUTO
757 CFLAGS_C99FSE = $CFLAGS_C99FSE
758 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
759 CFLAGS_NOSSP = $CFLAGS_NOSSP
762 LDFLAGS_AUTO = $LDFLAGS_AUTO
763 CROSS_COMPILE = $CROSS_COMPILE
765 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
767 TOOL_LIBS = $tool_libs
770 test "x$static" = xno
&& echo "STATIC_LIBS ="
771 test "x$shared" = xno
&& echo "SHARED_LIBS ="
772 test "x$cc_family" = xgcc
&& echo 'WRAPCC_GCC = $(CC)'
773 test "x$cc_family" = xclang
&& echo 'WRAPCC_CLANG = $(CC)'
774 test "x$pic_default" = xyes
&& echo 'AOBJS = $(LOBJS)'
777 test "$srcdir" = "." ||
ln -sf $srcdir/Makefile .