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-wrapper=... build given musl toolchain wrapper [auto]
35 --disable-shared inhibit building shared library [enabled]
36 --disable-static inhibit building static library [enabled]
38 Some influential environment variables:
39 CC C compiler command [detected]
40 CFLAGS C compiler flags [-Os -pipe ...]
41 CROSS_COMPILE prefix for cross compiler and tools [none]
42 LIBCC compiler runtime library [detected]
44 Use these variables to override the choices made by configure.
53 tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
56 printf %s
\\n
"$1" |
sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
58 echo () { printf "%s\n" "$*" ; }
59 fail
() { echo "$*" ; exit 1 ; }
60 fnmatch
() { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
61 cmdexists
() { type "$1" >/dev
/null
2>&1 ; }
62 trycc
() { test -z "$CC" && cmdexists
"$1" && CC
=$1 ; }
65 while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
69 printf "checking preprocessor condition %s... " "$1"
70 echo "typedef int x;" > "$tmpc"
71 echo "#if $1" >> "$tmpc"
72 echo "#error yes" >> "$tmpc"
73 echo "#endif" >> "$tmpc"
74 if $CC $2 -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
84 printf "checking whether compiler accepts %s... " "$2"
85 echo "typedef int x;" > "$tmpc"
86 if $CC $CFLAGS_TRY $2 -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
88 eval "$1=\"\${$1} \$2\""
98 printf "checking whether linker accepts %s... " "$2"
99 echo "typedef int x;" > "$tmpc"
100 if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
102 eval "$1=\"\${$1} \$2\""
113 # Beginning of actual script
124 prefix
=/usr
/local
/musl
125 exec_prefix
='$(prefix)'
126 bindir
='$(exec_prefix)/bin'
127 libdir
='$(prefix)/lib'
128 includedir
='$(prefix)/include'
146 --srcdir=*) srcdir
=${arg#*=} ;;
147 --prefix=*) prefix
=${arg#*=} ;;
148 --exec-prefix=*) exec_prefix
=${arg#*=} ;;
149 --bindir=*) bindir
=${arg#*=} ;;
150 --libdir=*) libdir
=${arg#*=} ;;
151 --includedir=*) includedir
=${arg#*=} ;;
152 --syslibdir=*) syslibdir
=${arg#*=} ;;
153 --enable-shared|
--enable-shared=yes) shared
=yes ;;
154 --disable-shared|
--enable-shared=no
) shared
=no
;;
155 --enable-static|
--enable-static=yes) static
=yes ;;
156 --disable-static|
--enable-static=no
) static
=no
;;
157 --enable-optimize) optimize
=yes ;;
158 --enable-optimize=*) optimize
=${arg#*=} ;;
159 --disable-optimize) optimize
=no
;;
160 --enable-debug|
--enable-debug=yes) debug
=yes ;;
161 --disable-debug|
--enable-debug=no
) debug
=no
;;
162 --enable-warnings|
--enable-warnings=yes) warnings
=yes ;;
163 --disable-warnings|
--enable-warnings=no
) warnings
=no
;;
164 --enable-wrapper|
--enable-wrapper=yes) wrapper
=detect
;;
165 --enable-wrapper=all
) wrapper
=yes ; gcc_wrapper
=yes ; clang_wrapper
=yes ;;
166 --enable-wrapper=gcc
) wrapper
=yes ; gcc_wrapper
=yes ;;
167 --enable-wrapper=clang
) wrapper
=yes ; clang_wrapper
=yes ;;
168 --disable-wrapper|
--enable-wrapper=no
) wrapper
=no
;;
169 --enable-gcc-wrapper|
--enable-gcc-wrapper=yes) wrapper
=yes ; gcc_wrapper
=yes ;;
170 --disable-gcc-wrapper|
--enable-gcc-wrapper=no
) wrapper
=no
;;
171 --enable-*|
--disable-*|
--with-*|
--without-*|
--*dir
=*) ;;
172 --host=*|
--target=*) target
=${arg#*=} ;;
173 --build=*) build
=${arg#*=} ;;
174 -* ) echo "$0: unknown option $arg" ;;
175 AR
=*) AR
=${arg#*=} ;;
176 RANLIB
=*) RANLIB
=${arg#*=} ;;
177 CC
=*) CC
=${arg#*=} ;;
178 CFLAGS
=*) CFLAGS
=${arg#*=} ;;
179 CPPFLAGS
=*) CPPFLAGS
=${arg#*=} ;;
180 LDFLAGS
=*) LDFLAGS
=${arg#*=} ;;
181 CROSS_COMPILE
=*) CROSS_COMPILE
=${arg#*=} ;;
182 LIBCC
=*) LIBCC
=${arg#*=} ;;
184 *) build
=$arg ; target
=$arg ;;
188 for i
in srcdir prefix exec_prefix bindir libdir includedir syslibdir
; do
193 # Get the source dir for out-of-tree builds
195 if test -z "$srcdir" ; then
196 srcdir
="${0%/configure}"
199 abs_builddir
="$(pwd)" || fail
"$0: cannot determine working directory"
200 abs_srcdir
="$(cd $srcdir && pwd)" || fail
"$0: invalid source directory $srcdir"
201 test "$abs_srcdir" = "$abs_builddir" && srcdir
=.
202 test "$srcdir" != "." -a -f Makefile
-a ! -h Makefile
&& fail
"$0: Makefile already exists in the working directory"
205 # Get a temp filename we can use
209 while : ; do i
=$
(($i+1))
210 tmpc
="./conf$$-$PPID-$i.c"
211 2>|
/dev
/null
> "$tmpc" && break
212 test "$i" -gt 50 && fail
"$0: cannot create temporary file $tmpc"
215 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
218 # Check whether we are cross-compiling, and set a default
219 # CROSS_COMPILE prefix if none was provided.
222 test "$target" != "$build" && \
223 test -z "$CROSS_COMPILE" && \
224 CROSS_COMPILE
="$target-"
227 # Find a C compiler to use
229 printf "checking for C compiler... "
230 trycc
${CROSS_COMPILE}gcc
231 trycc
${CROSS_COMPILE}c99
232 trycc
${CROSS_COMPILE}cc
234 test -n "$CC" ||
{ echo "$0: cannot find a C compiler" ; exit 1 ; }
236 printf "checking whether C compiler works... "
237 echo "typedef int x;" > "$tmpc"
238 if output
=$
($CC $CPPFLAGS $CFLAGS -c -o /dev
/null
"$tmpc" 2>&1) ; then
241 printf "no; compiler output follows:\n%s\n" "$output"
246 # Figure out options to force errors on unknown flags.
248 tryflag CFLAGS_TRY
-Werror=unknown-warning-option
249 tryflag CFLAGS_TRY
-Werror=unused-command-line-argument
250 tryflag CFLAGS_TRY
-Werror=ignored-optimization-argument
251 tryldflag LDFLAGS_TRY
-Werror=unknown-warning-option
252 tryldflag LDFLAGS_TRY
-Werror=unused-command-line-argument
255 # Need to know if the compiler is gcc or clang to decide which toolchain
258 printf "checking for C compiler family... "
259 cc_ver
="$(LC_ALL=C $CC -v 2>&1)"
261 if fnmatch
'*gcc\ version*' "$cc_ver" ; then
263 elif fnmatch
'*clang\ version*' "$cc_ver" ; then
269 # Figure out toolchain wrapper to build
271 if test "$wrapper" = auto
-o "$wrapper" = detect
; then
272 echo "#include <stdlib.h>" > "$tmpc"
273 echo "#if ! __GLIBC__" >> "$tmpc"
274 echo "#error no" >> "$tmpc"
275 echo "#endif" >> "$tmpc"
276 printf "checking for toolchain wrapper to build... "
277 if test "$wrapper" = auto
&& ! $CC -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
279 elif test "$cc_family" = gcc
; then
282 elif test "$cc_family" = clang
; then
287 if test "$wrapper" = detect
; then
288 fail
"$0: could not find an appropriate toolchain wrapper"
293 if test "$gcc_wrapper" = yes ; then
294 tools
="$tools obj/musl-gcc"
295 tool_libs
="$tool_libs lib/musl-gcc.specs"
297 if test "$clang_wrapper" = yes ; then
298 tools
="$tools obj/musl-clang obj/ld.musl-clang"
302 # Find the target architecture
304 printf "checking target system type... "
305 test -n "$target" || target
=$
($CC -dumpmachine 2>/dev
/null
) || target
=unknown
306 printf "%s\n" "$target"
309 # Convert to just ARCH
312 # Catch these early to simplify matching for 32-bit archs
314 aarch64
*) ARCH
=aarch64
;;
315 i?
86-nt32*) ARCH
=nt32
;;
317 x86_64-x32
*|x32
*|x86_64
*x32
) ARCH
=x32
;;
318 x86_64-nt64
*) ARCH
=nt64
;;
319 x86_64
*) ARCH
=x86_64
;;
321 mips64
*|mipsisa64
*) ARCH
=mips64
;;
323 microblaze
*) ARCH
=microblaze
;;
325 powerpc64
*|ppc64
*) ARCH
=powerpc64
;;
326 powerpc
*|ppc
*) ARCH
=powerpc
;;
327 riscv64
*) ARCH
=riscv64
;;
328 sh
[1-9bel-]*|sh|superh
*) ARCH
=sh
;;
329 s390x
*) ARCH
=s390x
;;
330 unknown
) fail
"$0: unable to detect target arch; try $0 --target=..." ;;
331 *) fail
"$0: unknown or unsupported target \"$target\"" ;;
335 # Try to get a conforming C99 freestanding environment
337 tryflag CFLAGS_C99FSE
-std=c99
338 tryflag CFLAGS_C99FSE
-nostdinc
339 tryflag CFLAGS_C99FSE
-ffreestanding \
340 || tryflag CFLAGS_C99FSE
-fno-builtin
341 tryflag CFLAGS_C99FSE
-fexcess-precision=standard \
342 ||
{ test "$ARCH" = i386
&& tryflag CFLAGS_C99FSE
-ffloat-store ; }
343 tryflag CFLAGS_C99FSE
-frounding-math
346 # We may use the may_alias attribute if __GNUC__ is defined, so
347 # if the compiler defines __GNUC__ but does not provide it,
348 # it must be defined away as part of the CFLAGS.
350 printf "checking whether compiler needs attribute((may_alias)) suppression... "
354 __attribute__((__may_alias__))
358 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
359 -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
363 CFLAGS_C99FSE
="$CFLAGS_C99FSE -D__may_alias__="
367 # The GNU toolchain defaults to assuming unmarked files need an
368 # executable stack, potentially exposing vulnerabilities in programs
369 # linked with such object files. Fix this.
371 tryflag CFLAGS_C99FSE
-Wa,--noexecstack
374 # Check for options to disable stack protector, which needs to be
375 # disabled for a few early-bootstrap translation units. If not found,
376 # this is not an error; we assume the toolchain does not do ssp.
378 tryflag CFLAGS_NOSSP
-fno-stack-protector
381 # Check for options that may be needed to prevent the compiler from
382 # generating self-referential versions of memcpy,, memmove, memcmp,
383 # and memset. Really, we should add a check to determine if this
384 # option is sufficient, and if not, add a macro to cripple these
385 # functions with volatile...
387 tryflag CFLAGS_MEMOPS
-fno-tree-loop-distribute-patterns
390 # Enable debugging if requessted.
392 test "$debug" = yes && CFLAGS_AUTO
=-g
395 # Preprocess asm files to add extra debugging information if debug is
396 # enabled, our assembler supports the needed directives, and the
397 # preprocessing script has been written for our architecture.
399 printf "checking whether we should preprocess assembly to add debugging information... "
400 if fnmatch
'-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" &&
401 test -f "tools/add-cfi.$ARCH.awk" &&
402 printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" |
$CC -g -x assembler
-c -o /dev
/null
2>/dev
/null
-
408 printf "%s\n" "$ADD_CFI"
411 # Possibly add a -O option to CFLAGS and select modules to optimize with
412 # -O3 based on the status of --enable-optimize and provided CFLAGS.
414 printf "checking for optimization settings... "
417 if fnmatch
'-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
418 printf "using provided CFLAGS\n" ;optimize
=no
420 printf "using defaults\n" ; optimize
=yes
423 xsize|xnone
) printf "minimize size\n" ; optimize
=size
;;
424 xno|x
) printf "disabled\n" ; optimize
=no
;;
425 *) printf "custom\n" ;;
428 test "$optimize" = no || tryflag CFLAGS_AUTO
-Os || tryflag CFLAGS_AUTO
-O2
429 test "$optimize" = yes && optimize
="internal,malloc,string"
431 if fnmatch
'no|size' "$optimize" ; then :
433 printf "components to be optimized for speed:"
434 while test "$optimize" ; do
436 *,*) this
=${optimize%%,*} optimize
=${optimize#*,} ;;
437 *) this
=$optimize optimize
=
442 */*) this
=$this*.c
;;
445 OPTIMIZE_GLOBS
="$OPTIMIZE_GLOBS $this"
447 OPTIMIZE_GLOBS
=${OPTIMIZE_GLOBS# }
452 tryflag CFLAGS_AUTO
-pipe
455 # If debugging is disabled, omit frame pointer. Modern GCC does this
456 # anyway on most archs even when debugging is enabled since the frame
457 # pointer is no longer needed for debugging.
459 if fnmatch
'-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
461 tryflag CFLAGS_AUTO
-fomit-frame-pointer
465 # Modern GCC wants to put DWARF tables (used for debugging and
466 # unwinding) in the loaded part of the program where they are
467 # unstrippable. These options force them back to debug sections (and
468 # cause them not to get generated at all if debugging is off).
470 tryflag CFLAGS_AUTO
-fno-unwind-tables
471 tryflag CFLAGS_AUTO
-fno-asynchronous-unwind-tables
474 # Attempt to put each function and each data object in its own
475 # section. This both allows additional size optimizations at link
476 # time and works around a dangerous class of compiler/assembler bugs
477 # whereby relative address expressions are constant-folded by the
478 # assembler even when one or more of the symbols involved is
479 # replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc.
481 tryflag CFLAGS_AUTO
-ffunction-sections
482 tryflag CFLAGS_AUTO
-fdata-sections
485 # On x86, make sure we don't have incompatible instruction set
486 # extensions enabled by default. This is bad for making static binaries.
487 # We cheat and use i486 rather than i386 because i386 really does not
488 # work anyway (issues with atomic ops).
489 # Some build environments pass -march and -mtune options via CC, so
490 # check both CC and CFLAGS.
492 if test "$ARCH" = "i386" ; then
493 fnmatch
'-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO
-march=i486
494 fnmatch
'-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO
-mtune=generic
498 # GCC defines -w as overriding any -W options, regardless of order, but
499 # clang has a bunch of annoying warnings enabled by default and needs -w
500 # to start from a clean slate. So use -w if building with clang.
502 test "$cc_family" = clang
&& tryflag CFLAGS_AUTO
-w
505 # Even with -std=c99, gcc accepts some constructs which are constraint
506 # violations. We want to treat these as errors regardless of whether
507 # other purely stylistic warnings are enabled -- especially implicit
508 # function declarations, which are a dangerous programming error.
510 tryflag CFLAGS_AUTO
-Werror=implicit-function-declaration
511 tryflag CFLAGS_AUTO
-Werror=implicit-int
512 tryflag CFLAGS_AUTO
-Werror=pointer-sign
513 tryflag CFLAGS_AUTO
-Werror=pointer-arith
516 # GCC ignores unused arguements by default, but Clang needs this extra
517 # parameter to stop printing warnings about LDFLAGS passed during
518 # compiling stage and CFLAGS passed during linking stage.
520 test "$cc_family" = clang
&& tryflag CFLAGS_AUTO
-Qunused-arguments
522 if test "x$warnings" = xyes
; then
523 tryflag CFLAGS_AUTO
-Wall
524 tryflag CFLAGS_AUTO
-Wno-parentheses
525 tryflag CFLAGS_AUTO
-Wno-uninitialized
526 tryflag CFLAGS_AUTO
-Wno-missing-braces
527 tryflag CFLAGS_AUTO
-Wno-unused-value
528 tryflag CFLAGS_AUTO
-Wno-unused-but-set-variable
529 tryflag CFLAGS_AUTO
-Wno-unknown-pragmas
530 tryflag CFLAGS_AUTO
-Wno-pointer-to-int-cast
533 # Determine if the compiler produces position-independent code (PIC)
534 # by default. If so, we don't need to compile separate object files
535 # for libc.a and libc.so.
536 if trycppif __PIC__
"$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
542 # Reduce space lost to padding for alignment purposes by sorting data
543 # objects according to their alignment reqirements. This approximates
545 tryldflag LDFLAGS_AUTO
-Wl,--sort-section,alignment
546 tryldflag LDFLAGS_AUTO
-Wl,--sort-common
548 # When linking shared library, drop dummy weak definitions that were
549 # replaced by strong definitions from other translation units.
550 tryldflag LDFLAGS_AUTO
-Wl,--gc-sections
552 # Some patched GCC builds have these defaults messed up...
553 tryldflag LDFLAGS_AUTO
-Wl,--hash-style=both
555 # Prevent linking if there are undefined symbols; if any exist,
556 # libc.so will crash at runtime during relocation processing.
557 # The common way this can happen is failure to link the compiler
558 # runtime library; implementation error is also a possibility.
559 tryldflag LDFLAGS_AUTO
-Wl,--no-undefined
561 # Avoid exporting symbols from compiler runtime libraries. They
562 # should be hidden anyway, but some toolchains including old gcc
563 # versions built without shared library support and pcc are broken.
564 tryldflag LDFLAGS_AUTO
-Wl,--exclude-libs=ALL
566 # Public data symbols must be interposable to allow for copy
567 # relocations, but otherwise we want to bind symbols at libc link
568 # time to eliminate startup relocations and PLT overhead. Use
569 # --dynamic-list rather than -Bsymbolic-functions for greater
570 # control over what symbols are left unbound.
571 tryldflag LDFLAGS_AUTO
-Wl,--dynamic-list="$srcdir/dynamic.list"
573 # Find compiler runtime library
574 test -z "$LIBCC" && tryldflag LIBCC
-lgcc && tryldflag LIBCC
-lgcc_eh
575 test -z "$LIBCC" && tryldflag LIBCC
-lcompiler_rt
576 test -z "$LIBCC" && try_libcc
=`$CC -print-libgcc-file-name 2>/dev/null` \
577 && tryldflag LIBCC
"$try_libcc"
578 test -z "$LIBCC" && try_libcc
=`$CC -print-file-name=libpcc.a 2>/dev/null` \
579 && tryldflag LIBCC
"$try_libcc"
580 printf "using compiler runtime libraries: %s\n" "$LIBCC"
582 # Figure out arch variants for archs with variants
584 t
="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
586 if test "$ARCH" = "i386" ; then
587 printf "checking whether compiler can use ebx in PIC asm constraints... "
589 int foo(int x) { __asm__ ( "" : "+b"(x) ); return x; }
591 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -fPIC \
592 -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
596 CFLAGS_AUTO
="$CFLAGS_AUTO -DBROKEN_EBX_ASM"
600 if test "$ARCH" = "x86_64" ; then
601 trycppif __ILP32__
"$t" && ARCH
=x32
604 if test "$ARCH" = "arm" ; then
605 if trycppif __thumb2__
"$t" ; then
606 tryflag CFLAGS_AUTO
-mimplicit-it=always
607 tryflag CFLAGS_AUTO
-Wa,-mimplicit-it=always
608 tryflag CFLAGS_AUTO
-Wa,-mthumb
610 trycppif __ARMEB__
"$t" && SUBARCH
=${SUBARCH}eb
611 trycppif __ARM_PCS_VFP
"$t" && SUBARCH
=${SUBARCH}hf
612 # Versions of clang up until at least 3.8 have the wrong constraint codes
613 # for floating point operands to inline asm. Detect this so the affected
614 # source files can just disable the asm.
615 if test "$cc_family" = clang
; then
616 printf "checking whether clang's vfp asm constraints work... "
617 echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc"
618 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
622 CFLAGS_AUTO
="$CFLAGS_AUTO -DBROKEN_VFP_ASM"
623 CFLAGS_AUTO
="${CFLAGS_AUTO# }"
628 if test "$ARCH" = "aarch64" ; then
629 trycppif __AARCH64EB__
"$t" && SUBARCH
=${SUBARCH}_be
632 if test "$ARCH" = "m68k" ; then
633 if trycppif
"__HAVE_68881__" ; then : ;
634 elif trycppif
"__mcffpu__" ; then SUBARCH
="-fp64"
639 if test "$ARCH" = "mips" ; then
640 trycppif
"__mips_isa_rev >= 6" "$t" && SUBARCH
=${SUBARCH}r6
641 trycppif
"_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH
=${SUBARCH}el
642 trycppif __mips_soft_float
"$t" && SUBARCH
=${SUBARCH}-sf
645 if test "$ARCH" = "mips64" ; then
646 trycppif
"_MIPS_SIM != _ABI64" "$t" && ARCH
=mipsn32
647 trycppif
"__mips_isa_rev >= 6" "$t" && SUBARCH
=${SUBARCH}r6
648 trycppif
"_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH
=${SUBARCH}el
649 trycppif __mips_soft_float
"$t" && SUBARCH
=${SUBARCH}-sf
652 if test "$ARCH" = "powerpc" ; then
653 trycppif
"__NO_FPRS__ && !_SOFT_FLOAT" "$t" && fail \
654 "$0: error: compiler's floating point configuration is unsupported"
655 trycppif _SOFT_FLOAT
"$t" && SUBARCH
=${SUBARCH}-sf
656 printf "checking whether compiler can use 'd' constraint in asm... "
657 echo 'double f(double x) { __asm__ ("fabs %0, %1" : "=d"(x) : "d"(x)); return x; }' > "$tmpc"
658 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
662 CFLAGS_AUTO
="$CFLAGS_AUTO -DBROKEN_PPC_D_ASM"
663 CFLAGS_AUTO
="${CFLAGS_AUTO# }"
667 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__
"$t" \
668 && SUBARCH
=${SUBARCH}el
670 if test "$ARCH" = "powerpc64" ; then
671 trycppif
"_CALL_ELF == 2" "$t" || fail
"$0: error: unsupported powerpc64 ABI"
672 trycppif __LITTLE_ENDIAN__
"$t" && SUBARCH
=${SUBARCH}le
673 trycppif _SOFT_FLOAT
"$t" && fail
"$0: error: soft-float not supported on powerpc64"
676 if test "$ARCH" = "riscv64" ; then
677 trycppif __riscv_float_abi_soft
"$t" && SUBARCH
=${SUBARCH}-sf
678 trycppif __riscv_float_abi_single
"$t" && SUBARCH
=${SUBARCH}-sp
681 if test "$ARCH" = "sh" ; then
682 tryflag CFLAGS_AUTO
-Wa,--isa=any
683 trycppif __BIG_ENDIAN__
"$t" && SUBARCH
=${SUBARCH}eb
684 if trycppif
"__SH_FPU_ANY__ || __SH4__" "$t" ; then
685 # Some sh configurations are broken and replace double with float
686 # rather than using softfloat when the fpu is present but only
687 # supports single precision. Reject them.
688 printf "checking whether compiler's double type is IEEE double... "
689 echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
690 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
694 fail
"$0: error: compiler's floating point configuration is unsupported"
697 SUBARCH
=${SUBARCH}-nofpu
699 if trycppif __SH_FDPIC__
"$t" ; then
700 SUBARCH
=${SUBARCH}-fdpic
705 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
707 case "$ARCH$SUBARCH" in
708 arm
) ASMSUBARCH
=el
;;
709 *) ASMSUBARCH
=$SUBARCH ;;
713 # Some archs (powerpc) have different possible long double formats
714 # that the compiler can be configured for. The logic for whether this
715 # is supported is in bits/float.h; in general, it is not. We need to
716 # check for mismatches here or code in printf, strotd, and scanf will
717 # be dangerously incorrect because it depends on (1) the macros being
718 # correct, and (2) IEEE semantics.
720 printf "checking whether compiler's long double definition matches float.h... "
721 echo '#include <float.h>' > "$tmpc"
722 echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc"
723 echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc"
724 if $CC $CFLAGS_C99FSE \
725 -I$srcdir/arch
/$ARCH -I$srcdir/arch
/generic
-I$srcdir/include \
726 $CPPFLAGS $CFLAGS -c -o /dev
/null
"$tmpc" >/dev
/null
2>&1 ; then
730 fail
"$0: error: unsupported long double type"
734 # Some build systems globally pass in broken CFLAGS like -ffast-math
735 # for all packages. On recent GCC we can detect this and error out
736 # early rather than producing a seriously-broken math library.
738 if trycppif
"__FAST_MATH__" \
739 "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
740 fail
"$0: error: compiler has broken floating point; check CFLAGS"
743 printf "creating config.mak... "
745 cmdline
=$
(quote
"$0")
746 for i
; do cmdline
="$cmdline $(quote "$i")" ; done
748 exec 3>&1 1>config.mak
752 # This version of config.mak was generated by:
754 # Any changes made here will be lost if configure is re-run
755 AR = ${AR:-\$(CROSS_COMPILE)ar}
756 RANLIB = ${RANLIB:-\$(CROSS_COMPILE)ranlib}
759 ASMSUBARCH = $ASMSUBARCH
762 exec_prefix = $exec_prefix
765 includedir = $includedir
766 syslibdir = $syslibdir
769 CFLAGS_AUTO = $CFLAGS_AUTO
770 CFLAGS_C99FSE = $CFLAGS_C99FSE
771 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
772 CFLAGS_NOSSP = $CFLAGS_NOSSP
775 LDFLAGS_AUTO = $LDFLAGS_AUTO
776 CROSS_COMPILE = $CROSS_COMPILE
778 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
780 TOOL_LIBS = $tool_libs
783 test "x$static" = xno
&& echo "STATIC_LIBS ="
784 test "x$shared" = xno
&& echo "SHARED_LIBS ="
785 test "x$cc_family" = xgcc
&& echo 'WRAPCC_GCC = $(CC)'
786 test "x$cc_family" = xclang
&& echo 'WRAPCC_CLANG = $(CC)'
787 test "x$pic_default" = xyes
&& echo 'AOBJS = $(LOBJS)'
790 test "$srcdir" = "." ||
ln -sf $srcdir/Makefile .