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]
39 --with-malloc=... choose malloc implementation [mallocng]
41 Some influential environment variables:
42 CC C compiler command [detected]
43 CFLAGS C compiler flags [-Os -pipe ...]
44 CROSS_COMPILE prefix for cross compiler and tools [none]
45 LIBCC compiler runtime library [detected]
47 Use these variables to override the choices made by configure.
56 tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
59 printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
61 echo () { printf "%s\n" "$*" ; }
62 fail () { echo "$*" ; exit 1 ; }
63 fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
64 cmdexists () { type "$1" >/dev/null 2>&1 ; }
65 trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
68 while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
72 printf "checking preprocessor condition %s... " "$1"
73 echo "typedef int x;" > "$tmpc"
74 echo "#if $1" >> "$tmpc"
75 echo "#error yes" >> "$tmpc"
76 echo "#endif" >> "$tmpc"
77 if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
87 printf "checking whether compiler accepts %s... " "$2"
88 echo "typedef int x;" > "$tmpc"
89 if $CC $CFLAGS_TRY $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
91 eval "$1=\"\${$1} \$2\""
101 printf "checking whether linker accepts %s... " "$2"
102 echo "typedef int x;" > "$tmpc"
103 if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
105 eval "$1=\"\${$1} \$2\""
116 # Beginning of actual script
127 prefix=/usr/local/musl
128 exec_prefix='$(prefix)'
129 bindir='$(exec_prefix)/bin'
130 libdir='$(prefix)/lib'
131 includedir='$(prefix)/include'
150 --srcdir=*) srcdir=${arg#*=} ;;
151 --prefix=*) prefix=${arg#*=} ;;
152 --exec-prefix=*) exec_prefix=${arg#*=} ;;
153 --bindir=*) bindir=${arg#*=} ;;
154 --libdir=*) libdir=${arg#*=} ;;
155 --includedir=*) includedir=${arg#*=} ;;
156 --syslibdir=*) syslibdir=${arg#*=} ;;
157 --enable-shared|--enable-shared=yes) shared=yes ;;
158 --disable-shared|--enable-shared=no) shared=no ;;
159 --enable-static|--enable-static=yes) static=yes ;;
160 --disable-static|--enable-static=no) static=no ;;
161 --enable-optimize) optimize=yes ;;
162 --enable-optimize=*) optimize=${arg#*=} ;;
163 --disable-optimize) optimize=no ;;
164 --enable-debug|--enable-debug=yes) debug=yes ;;
165 --disable-debug|--enable-debug=no) debug=no ;;
166 --enable-warnings|--enable-warnings=yes) warnings=yes ;;
167 --disable-warnings|--enable-warnings=no) warnings=no ;;
168 --enable-wrapper|--enable-wrapper=yes) wrapper=detect ;;
169 --enable-wrapper=all) wrapper=yes ; gcc_wrapper=yes ; clang_wrapper=yes ;;
170 --enable-wrapper=gcc) wrapper=yes ; gcc_wrapper=yes ;;
171 --enable-wrapper=clang) wrapper=yes ; clang_wrapper=yes ;;
172 --disable-wrapper|--enable-wrapper=no) wrapper=no ;;
173 --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;;
174 --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
175 --with-malloc=*) malloc_dir=${arg#*=} ;;
176 --enable-*|--disable-*|--with-*|--without-*|--*dir=*) ;;
177 --host=*|--target=*) target=${arg#*=} ;;
178 --build=*) build=${arg#*=} ;;
179 -* ) echo "$0: unknown option $arg" ;;
180 AR=*) AR=${arg#*=} ;;
181 RANLIB=*) RANLIB=${arg#*=} ;;
182 CC=*) CC=${arg#*=} ;;
183 CFLAGS=*) CFLAGS=${arg#*=} ;;
184 CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
185 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
186 CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
187 LIBCC=*) LIBCC=${arg#*=} ;;
189 *) build=$arg ; target=$arg ;;
193 for i in srcdir prefix exec_prefix bindir libdir includedir syslibdir ; do
198 # Get the source dir for out-of-tree builds
200 if test -z "$srcdir" ; then
201 srcdir="${0%/configure}"
204 abs_builddir="$(pwd)" || fail "$0: cannot determine working directory"
205 abs_srcdir="$(cd $srcdir && pwd)" || fail "$0: invalid source directory $srcdir"
206 test "$abs_srcdir" = "$abs_builddir" && srcdir=.
207 test "$srcdir" != "." -a -f Makefile -a ! -h Makefile && fail "$0: Makefile already exists in the working directory"
210 # Get a temp filename we can use
214 while : ; do i=$(($i+1))
215 tmpc="./conf$$-$PPID-$i.c"
216 2>|/dev/null > "$tmpc" && break
217 test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
220 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
223 # Check that the requested malloc implementation exists
225 test -d "$srcdir/src/malloc/$malloc_dir" \
226 || fail "$0: error: chosen malloc implementation '$malloc_dir' does not exist"
229 # Check whether we are cross-compiling, and set a default
230 # CROSS_COMPILE prefix if none was provided.
233 test "$target" != "$build" && \
234 test -z "$CROSS_COMPILE" && \
235 CROSS_COMPILE="$target-"
238 # Find a C compiler to use
240 printf "checking for C compiler... "
241 trycc ${CROSS_COMPILE}gcc
242 trycc ${CROSS_COMPILE}c99
243 trycc ${CROSS_COMPILE}cc
245 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
247 printf "checking whether C compiler works... "
248 echo "typedef int x;" > "$tmpc"
249 if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then
252 printf "no; compiler output follows:\n%s\n" "$output"
257 # Figure out options to force errors on unknown flags.
259 tryflag CFLAGS_TRY -Werror=unknown-warning-option
260 tryflag CFLAGS_TRY -Werror=unused-command-line-argument
261 tryflag CFLAGS_TRY -Werror=ignored-optimization-argument
262 tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
263 tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
266 # Need to know if the compiler is gcc or clang to decide which toolchain
269 printf "checking for C compiler family... "
270 cc_ver="$(LC_ALL=C $CC -v 2>&1)"
272 if fnmatch '*gcc\ version*' "$cc_ver" ; then
274 elif fnmatch '*clang\ version*' "$cc_ver" ; then
280 # Figure out toolchain wrapper to build
282 if test "$wrapper" = auto -o "$wrapper" = detect ; then
283 echo "#include <stdlib.h>" > "$tmpc"
284 echo "#if ! __GLIBC__" >> "$tmpc"
285 echo "#error no" >> "$tmpc"
286 echo "#endif" >> "$tmpc"
287 printf "checking for toolchain wrapper to build... "
288 if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
290 elif test "$cc_family" = gcc ; then
293 elif test "$cc_family" = clang ; then
298 if test "$wrapper" = detect ; then
299 fail "$0: could not find an appropriate toolchain wrapper"
304 if test "$gcc_wrapper" = yes ; then
305 tools="$tools obj/musl-gcc"
306 tool_libs="$tool_libs lib/musl-gcc.specs"
308 if test "$clang_wrapper" = yes ; then
309 tools="$tools obj/musl-clang obj/ld.musl-clang"
313 # Find the target architecture
315 printf "checking target system type... "
316 test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown
317 printf "%s\n" "$target"
320 # Convert to just ARCH
323 # Catch these early to simplify matching for 32-bit archs
325 aarch64*) ARCH=aarch64 ;;
326 i?86-nt32*) ARCH=nt32 ;;
328 x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;;
329 x86_64-nt64*) ARCH=nt64 ;;
330 x86_64*) ARCH=x86_64 ;;
332 mips64*|mipsisa64*) ARCH=mips64 ;;
334 microblaze*) ARCH=microblaze ;;
336 powerpc64*|ppc64*) ARCH=powerpc64 ;;
337 powerpc*|ppc*) ARCH=powerpc ;;
338 riscv64*) ARCH=riscv64 ;;
339 sh[1-9bel-]*|sh|superh*) ARCH=sh ;;
340 s390x*) ARCH=s390x ;;
341 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
342 *) fail "$0: unknown or unsupported target \"$target\"" ;;
346 # Try to get a conforming C99 freestanding environment
348 tryflag CFLAGS_C99FSE -std=c99
349 tryflag CFLAGS_C99FSE -nostdinc
350 tryflag CFLAGS_C99FSE -ffreestanding \
351 || tryflag CFLAGS_C99FSE -fno-builtin
352 tryflag CFLAGS_C99FSE -fexcess-precision=standard \
353 || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
354 tryflag CFLAGS_C99FSE -frounding-math
357 # We may use the may_alias attribute if __GNUC__ is defined, so
358 # if the compiler defines __GNUC__ but does not provide it,
359 # it must be defined away as part of the CFLAGS.
361 printf "checking whether compiler needs attribute((may_alias)) suppression... "
365 __attribute__((__may_alias__))
369 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
370 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
374 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
378 # The GNU toolchain defaults to assuming unmarked files need an
379 # executable stack, potentially exposing vulnerabilities in programs
380 # linked with such object files. Fix this.
382 tryflag CFLAGS_C99FSE -Wa,--noexecstack
385 # Check for options to disable stack protector, which needs to be
386 # disabled for a few early-bootstrap translation units. If not found,
387 # this is not an error; we assume the toolchain does not do ssp.
389 tryflag CFLAGS_NOSSP -fno-stack-protector
392 # Check for options that may be needed to prevent the compiler from
393 # generating self-referential versions of memcpy,, memmove, memcmp,
394 # and memset. Really, we should add a check to determine if this
395 # option is sufficient, and if not, add a macro to cripple these
396 # functions with volatile...
398 tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
401 # Enable debugging if requessted.
403 test "$debug" = yes && CFLAGS_AUTO=-g
406 # Preprocess asm files to add extra debugging information if debug is
407 # enabled, our assembler supports the needed directives, and the
408 # preprocessing script has been written for our architecture.
410 printf "checking whether we should preprocess assembly to add debugging information... "
411 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" &&
412 test -f "tools/add-cfi.$ARCH.awk" &&
413 printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null -
419 printf "%s\n" "$ADD_CFI"
422 # Possibly add a -O option to CFLAGS and select modules to optimize with
423 # -O3 based on the status of --enable-optimize and provided CFLAGS.
425 printf "checking for optimization settings... "
428 if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
429 printf "using provided CFLAGS\n" ;optimize=no
431 printf "using defaults\n" ; optimize=yes
434 xsize|xnone) printf "minimize size\n" ; optimize=size ;;
435 xno|x) printf "disabled\n" ; optimize=no ;;
436 *) printf "custom\n" ;;
439 test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
440 test "$optimize" = yes && optimize="internal,malloc,string"
442 if fnmatch 'no|size' "$optimize" ; then :
444 printf "components to be optimized for speed:"
445 while test "$optimize" ; do
447 *,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
448 *) this=$optimize optimize=
453 */*) this=$this*.c ;;
456 OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
458 OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
463 tryflag CFLAGS_AUTO -pipe
466 # If debugging is disabled, omit frame pointer. Modern GCC does this
467 # anyway on most archs even when debugging is enabled since the frame
468 # pointer is no longer needed for debugging.
470 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
472 tryflag CFLAGS_AUTO -fomit-frame-pointer
476 # Modern GCC wants to put DWARF tables (used for debugging and
477 # unwinding) in the loaded part of the program where they are
478 # unstrippable. These options force them back to debug sections (and
479 # cause them not to get generated at all if debugging is off).
481 tryflag CFLAGS_AUTO -fno-unwind-tables
482 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
485 # Attempt to put each function and each data object in its own
486 # section. This both allows additional size optimizations at link
487 # time and works around a dangerous class of compiler/assembler bugs
488 # whereby relative address expressions are constant-folded by the
489 # assembler even when one or more of the symbols involved is
490 # replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc.
492 tryflag CFLAGS_AUTO -ffunction-sections
493 tryflag CFLAGS_AUTO -fdata-sections
496 # On x86, make sure we don't have incompatible instruction set
497 # extensions enabled by default. This is bad for making static binaries.
498 # We cheat and use i486 rather than i386 because i386 really does not
499 # work anyway (issues with atomic ops).
500 # Some build environments pass -march and -mtune options via CC, so
501 # check both CC and CFLAGS.
503 if test "$ARCH" = "i386" ; then
504 fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
505 fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
509 # GCC defines -w as overriding any -W options, regardless of order, but
510 # clang has a bunch of annoying warnings enabled by default and needs -w
511 # to start from a clean slate. So use -w if building with clang.
513 test "$cc_family" = clang && tryflag CFLAGS_AUTO -w
516 # Even with -std=c99, gcc accepts some constructs which are constraint
517 # violations. We want to treat these as errors regardless of whether
518 # other purely stylistic warnings are enabled -- especially implicit
519 # function declarations, which are a dangerous programming error.
521 tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
522 tryflag CFLAGS_AUTO -Werror=implicit-int
523 tryflag CFLAGS_AUTO -Werror=pointer-sign
524 tryflag CFLAGS_AUTO -Werror=pointer-arith
527 # GCC ignores unused arguements by default, but Clang needs this extra
528 # parameter to stop printing warnings about LDFLAGS passed during
529 # compiling stage and CFLAGS passed during linking stage.
531 test "$cc_family" = clang && tryflag CFLAGS_AUTO -Qunused-arguments
533 if test "x$warnings" = xyes ; then
534 tryflag CFLAGS_AUTO -Wall
535 tryflag CFLAGS_AUTO -Wno-parentheses
536 tryflag CFLAGS_AUTO -Wno-uninitialized
537 tryflag CFLAGS_AUTO -Wno-missing-braces
538 tryflag CFLAGS_AUTO -Wno-unused-value
539 tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
540 tryflag CFLAGS_AUTO -Wno-unknown-pragmas
541 tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
544 # Determine if the compiler produces position-independent code (PIC)
545 # by default. If so, we don't need to compile separate object files
546 # for libc.a and libc.so.
547 if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
553 # Reduce space lost to padding for alignment purposes by sorting data
554 # objects according to their alignment reqirements. This approximates
556 tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment
557 tryldflag LDFLAGS_AUTO -Wl,--sort-common
559 # When linking shared library, drop dummy weak definitions that were
560 # replaced by strong definitions from other translation units.
561 tryldflag LDFLAGS_AUTO -Wl,--gc-sections
563 # Some patched GCC builds have these defaults messed up...
564 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
566 # Prevent linking if there are undefined symbols; if any exist,
567 # libc.so will crash at runtime during relocation processing.
568 # The common way this can happen is failure to link the compiler
569 # runtime library; implementation error is also a possibility.
570 tryldflag LDFLAGS_AUTO -Wl,--no-undefined
572 # Avoid exporting symbols from compiler runtime libraries. They
573 # should be hidden anyway, but some toolchains including old gcc
574 # versions built without shared library support and pcc are broken.
575 tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL
577 # Public data symbols must be interposable to allow for copy
578 # relocations, but otherwise we want to bind symbols at libc link
579 # time to eliminate startup relocations and PLT overhead. Use
580 # --dynamic-list rather than -Bsymbolic-functions for greater
581 # control over what symbols are left unbound.
582 tryldflag LDFLAGS_AUTO -Wl,--dynamic-list="$srcdir/dynamic.list"
584 # Find compiler runtime library
585 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
586 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
587 test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \
588 && tryldflag LIBCC "$try_libcc"
589 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
590 && tryldflag LIBCC "$try_libcc"
591 printf "using compiler runtime libraries: %s\n" "$LIBCC"
593 # Figure out arch variants for archs with variants
595 t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
597 if test "$ARCH" = "i386" ; then
598 printf "checking whether compiler can use ebx in PIC asm constraints... "
600 int foo(int x) { __asm__ ( "" : "+b"(x) ); return x; }
602 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -fPIC \
603 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
607 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_EBX_ASM"
611 if test "$ARCH" = "x86_64" ; then
612 trycppif __ILP32__ "$t" && ARCH=x32
615 if test "$ARCH" = "arm" ; then
616 if trycppif __thumb2__ "$t" ; then
617 tryflag CFLAGS_AUTO -mimplicit-it=always
618 tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always
619 tryflag CFLAGS_AUTO -Wa,-mthumb
621 trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
622 trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
623 # Versions of clang up until at least 3.8 have the wrong constraint codes
624 # for floating point operands to inline asm. Detect this so the affected
625 # source files can just disable the asm.
626 if test "$cc_family" = clang ; then
627 printf "checking whether clang's vfp asm constraints work... "
628 echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc"
629 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
633 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_VFP_ASM"
634 CFLAGS_AUTO="${CFLAGS_AUTO# }"
639 if test "$ARCH" = "aarch64" ; then
640 trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be
643 if test "$ARCH" = "m68k" ; then
644 if trycppif "__HAVE_68881__" ; then : ;
645 elif trycppif "__mcffpu__" ; then SUBARCH="-fp64"
650 if test "$ARCH" = "mips" ; then
651 trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
652 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
653 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
656 if test "$ARCH" = "mips64" ; then
657 trycppif "_MIPS_SIM != _ABI64" "$t" && ARCH=mipsn32
658 trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
659 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
660 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
663 if test "$ARCH" = "powerpc" ; then
664 trycppif "__NO_FPRS__ && !_SOFT_FLOAT" "$t" && fail \
665 "$0: error: compiler's floating point configuration is unsupported"
666 trycppif _SOFT_FLOAT "$t" && SUBARCH=${SUBARCH}-sf
667 printf "checking whether compiler can use 'd' constraint in asm... "
668 echo 'double f(double x) { __asm__ ("fabs %0, %1" : "=d"(x) : "d"(x)); return x; }' > "$tmpc"
669 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
673 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_PPC_D_ASM"
674 CFLAGS_AUTO="${CFLAGS_AUTO# }"
678 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
679 && SUBARCH=${SUBARCH}el
681 if test "$ARCH" = "powerpc64" ; then
682 trycppif "_CALL_ELF == 2" "$t" || fail "$0: error: unsupported powerpc64 ABI"
683 trycppif __LITTLE_ENDIAN__ "$t" && SUBARCH=${SUBARCH}le
684 trycppif _SOFT_FLOAT "$t" && fail "$0: error: soft-float not supported on powerpc64"
687 if test "$ARCH" = "riscv64" ; then
688 trycppif __riscv_float_abi_soft "$t" && SUBARCH=${SUBARCH}-sf
689 trycppif __riscv_float_abi_single "$t" && SUBARCH=${SUBARCH}-sp
692 if test "$ARCH" = "sh" ; then
693 tryflag CFLAGS_AUTO -Wa,--isa=any
694 trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
695 if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
696 # Some sh configurations are broken and replace double with float
697 # rather than using softfloat when the fpu is present but only
698 # supports single precision. Reject them.
699 printf "checking whether compiler's double type is IEEE double... "
700 echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
701 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
705 fail "$0: error: compiler's floating point configuration is unsupported"
708 SUBARCH=${SUBARCH}-nofpu
710 if trycppif __SH_FDPIC__ "$t" ; then
711 SUBARCH=${SUBARCH}-fdpic
716 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
718 case "$ARCH$SUBARCH" in
719 arm) ASMSUBARCH=el ;;
720 *) ASMSUBARCH=$SUBARCH ;;
724 # Some archs (powerpc) have different possible long double formats
725 # that the compiler can be configured for. The logic for whether this
726 # is supported is in bits/float.h; in general, it is not. We need to
727 # check for mismatches here or code in printf, strotd, and scanf will
728 # be dangerously incorrect because it depends on (1) the macros being
729 # correct, and (2) IEEE semantics.
731 printf "checking whether compiler's long double definition matches float.h... "
732 echo '#include <float.h>' > "$tmpc"
733 echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc"
734 echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc"
735 if $CC $CFLAGS_C99FSE \
736 -I$srcdir/arch/$ARCH -I$srcdir/arch/generic -I$srcdir/include \
737 $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
741 fail "$0: error: unsupported long double type"
745 # Some build systems globally pass in broken CFLAGS like -ffast-math
746 # for all packages. On recent GCC we can detect this and error out
747 # early rather than producing a seriously-broken math library.
749 if trycppif "__FAST_MATH__" \
750 "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
751 fail "$0: error: compiler has broken floating point; check CFLAGS"
754 printf "creating config.mak... "
756 cmdline=$(quote "$0")
757 for i ; do cmdline="$cmdline $(quote "$i")" ; done
759 exec 3>&1 1>config.mak
763 # This version of config.mak was generated by:
765 # Any changes made here will be lost if configure is re-run
766 AR = ${AR:-\$(CROSS_COMPILE)ar}
767 RANLIB = ${RANLIB:-\$(CROSS_COMPILE)ranlib}
770 ASMSUBARCH = $ASMSUBARCH
773 exec_prefix = $exec_prefix
776 includedir = $includedir
777 syslibdir = $syslibdir
780 CFLAGS_AUTO = $CFLAGS_AUTO
781 CFLAGS_C99FSE = $CFLAGS_C99FSE
782 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
783 CFLAGS_NOSSP = $CFLAGS_NOSSP
786 LDFLAGS_AUTO = $LDFLAGS_AUTO
787 CROSS_COMPILE = $CROSS_COMPILE
789 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
791 TOOL_LIBS = $tool_libs
793 MALLOC_DIR = $malloc_dir
795 test "x$static" = xno && echo "STATIC_LIBS ="
796 test "x$shared" = xno && echo "SHARED_LIBS ="
797 test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)'
798 test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)'
799 test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)'
802 test "$srcdir" = "." || ln -sf $srcdir/Makefile .