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.
12 Installation directories:
13 --prefix=PREFIX main installation prefix [/usr/local/musl]
14 --exec-prefix=EPREFIX installation prefix for executable files [PREFIX]
16 Fine tuning of the installation directories:
17 --bindir=DIR user executables [EPREFIX/bin]
18 --libdir=DIR library files for the linker [PREFIX/lib]
19 --includedir=DIR include files for the C compiler [PREFIX/include]
20 --syslibdir=DIR location for the dynamic linker [/lib]
23 --target=TARGET configure to run on target TARGET [detected]
24 --host=HOST same as --target
27 --enable-optimize=... optimize listed components for speed over size [auto]
28 --enable-debug build with debugging information [disabled]
29 --enable-warnings build with recommended warnings flags [disabled]
30 --enable-visibility use global visibility options to optimize PIC [auto]
31 --enable-wrapper=... build given musl toolchain wrapper [auto]
32 --disable-shared inhibit building shared library [enabled]
33 --disable-static inhibit building static library [enabled]
35 Some influential environment variables:
36 CC C compiler command [detected]
37 CFLAGS C compiler flags [-Os -pipe ...]
38 CROSS_COMPILE prefix for cross compiler and tools [none]
39 LIBCC compiler runtime library [detected]
41 Use these variables to override the choices made by configure.
50 tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
53 printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
55 echo () { printf "%s\n" "$*" ; }
56 fail () { echo "$*" ; exit 1 ; }
57 fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
58 cmdexists () { type "$1" >/dev/null 2>&1 ; }
59 trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
62 while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
66 printf "checking preprocessor condition %s... " "$1"
67 echo "typedef int x;" > "$tmpc"
68 echo "#if $1" >> "$tmpc"
69 echo "#error yes" >> "$tmpc"
70 echo "#endif" >> "$tmpc"
71 if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
81 printf "checking whether compiler accepts %s... " "$2"
82 echo "typedef int x;" > "$tmpc"
83 if $CC $CFLAGS_TRY $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
85 eval "$1=\"\${$1} \$2\""
95 printf "checking whether linker accepts %s... " "$2"
96 echo "typedef int x;" > "$tmpc"
97 if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
99 eval "$1=\"\${$1} \$2\""
110 # Beginning of actual script
120 prefix=/usr/local/musl
121 exec_prefix='$(prefix)'
122 bindir='$(exec_prefix)/bin'
123 libdir='$(prefix)/lib'
124 includedir='$(prefix)/include'
141 --prefix=*) prefix=${arg#*=} ;;
142 --exec-prefix=*) exec_prefix=${arg#*=} ;;
143 --bindir=*) bindir=${arg#*=} ;;
144 --libdir=*) libdir=${arg#*=} ;;
145 --includedir=*) includedir=${arg#*=} ;;
146 --syslibdir=*) syslibdir=${arg#*=} ;;
147 --enable-shared|--enable-shared=yes) shared=yes ;;
148 --disable-shared|--enable-shared=no) shared=no ;;
149 --enable-static|--enable-static=yes) static=yes ;;
150 --disable-static|--enable-static=no) static=no ;;
151 --enable-optimize) optimize=yes ;;
152 --enable-optimize=*) optimize=${arg#*=} ;;
153 --disable-optimize) optimize=no ;;
154 --enable-debug|--enable-debug=yes) debug=yes ;;
155 --disable-debug|--enable-debug=no) debug=no ;;
156 --enable-warnings|--enable-warnings=yes) warnings=yes ;;
157 --disable-warnings|--enable-warnings=no) warnings=no ;;
158 --enable-visibility|--enable-visibility=yes) visibility=yes ;;
159 --disable-visibility|--enable-visibility=no) visibility=no ;;
160 --enable-wrapper|--enable-wrapper=yes) wrapper=detect ;;
161 --enable-wrapper=all) wrapper=yes ; gcc_wrapper=yes ;;
162 --enable-wrapper=gcc) wrapper=yes ; gcc_wrapper=yes ;;
163 --disable-wrapper|--enable-wrapper=no) wrapper=no ;;
164 --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;;
165 --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
166 --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
167 --host=*|--target=*) target=${arg#*=} ;;
168 -* ) echo "$0: unknown option $arg" ;;
169 CC=*) CC=${arg#*=} ;;
170 CFLAGS=*) CFLAGS=${arg#*=} ;;
171 CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
172 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
173 CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
174 LIBCC=*) LIBCC=${arg#*=} ;;
180 for i in prefix exec_prefix bindir libdir includedir syslibdir ; do
185 # Get a temp filename we can use
189 while : ; do i=$(($i+1))
190 tmpc="./conf$$-$PPID-$i.c"
191 2>|/dev/null > "$tmpc" && break
192 test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
195 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
198 # Find a C compiler to use
200 printf "checking for C compiler... "
201 trycc ${CROSS_COMPILE}gcc
202 trycc ${CROSS_COMPILE}c99
203 trycc ${CROSS_COMPILE}cc
205 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
207 printf "checking whether C compiler works... "
208 echo "typedef int x;" > "$tmpc"
209 if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then
212 printf "no; compiler output follows:\n%s\n" "$output"
217 # Figure out options to force errors on unknown flags.
219 tryflag CFLAGS_TRY -Werror=unknown-warning-option
220 tryflag CFLAGS_TRY -Werror=unused-command-line-argument
221 tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
222 tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
225 # Need to know if the compiler is gcc or clang to decide which toolchain
228 printf "checking for C compiler family... "
229 cc_ver="$(LC_ALL=C $CC -v 2>&1)"
231 if fnmatch '*gcc\ version*' "$cc_ver" ; then
237 # Figure out toolchain wrapper to build
239 if test "$wrapper" = auto -o "$wrapper" = detect ; then
240 echo "#include <stdlib.h>" > "$tmpc"
241 echo "#if ! __GLIBC__" >> "$tmpc"
242 echo "#error no" >> "$tmpc"
243 echo "#endif" >> "$tmpc"
244 printf "checking for toolchain wrapper to build... "
245 if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
247 elif test "$cc_family" = gcc ; then
252 if test "$wrapper" = detect ; then
253 fail "$0: could not find an appropriate toolchain wrapper"
258 if test "$gcc_wrapper" = yes ; then
259 tools="$tools tools/musl-gcc"
260 tool_libs="$tool_libs lib/musl-gcc.specs"
264 # Find the target architecture
266 printf "checking target system type... "
267 test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown
268 printf "%s\n" "$target"
271 # Convert to just ARCH
274 # Catch these early to simplify matching for 32-bit archs
275 mips64*|powerpc64*) fail "$0: unsupported target \"$target\"" ;;
277 aarch64*) ARCH=aarch64 ;;
279 x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;;
280 x86_64*) ARCH=x86_64 ;;
282 microblaze*) ARCH=microblaze ;;
284 powerpc*) ARCH=powerpc ;;
285 sh[1-9bel-]*|sh|superh*) ARCH=sh ;;
286 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
287 *) fail "$0: unknown or unsupported target \"$target\"" ;;
291 # Try to get a conforming C99 freestanding environment
293 tryflag CFLAGS_C99FSE -std=c99
294 tryflag CFLAGS_C99FSE -nostdinc
295 tryflag CFLAGS_C99FSE -ffreestanding \
296 || tryflag CFLAGS_C99FSE -fno-builtin
297 tryflag CFLAGS_C99FSE -fexcess-precision=standard \
298 || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
299 tryflag CFLAGS_C99FSE -frounding-math
302 # We may use the may_alias attribute if __GNUC__ is defined, so
303 # if the compiler defines __GNUC__ but does not provide it,
304 # it must be defined away as part of the CFLAGS.
306 printf "checking whether compiler needs attribute((may_alias)) suppression... "
310 __attribute__((__may_alias__))
314 if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \
315 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
319 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
323 # Check for options to disable stack protector, which needs to be
324 # disabled for a few early-bootstrap translation units. If not found,
325 # this is not an error; we assume the toolchain does not do ssp.
327 tryflag CFLAGS_NOSSP -fno-stack-protector
330 # Check for options that may be needed to prevent the compiler from
331 # generating self-referential versions of memcpy,, memmove, memcmp,
332 # and memset. Really, we should add a check to determine if this
333 # option is sufficient, and if not, add a macro to cripple these
334 # functions with volatile...
336 tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
339 # Enable debugging if requessted.
341 test "$debug" = yes && CFLAGS_AUTO=-g
344 # Possibly add a -O option to CFLAGS and select modules to optimize with
345 # -O3 based on the status of --enable-optimize and provided CFLAGS.
347 printf "checking for optimization settings... "
350 if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
351 printf "using provided CFLAGS\n" ;optimize=no
353 printf "using defaults\n" ; optimize=yes
356 xsize|xnone) printf "minimize size\n" ; optimize=size ;;
357 xno|x) printf "disabled\n" ; optimize=no ;;
358 *) printf "custom\n" ;;
361 test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
362 test "$optimize" = yes && optimize="internal,malloc,string"
364 if fnmatch 'no|size' "$optimize" ; then :
366 printf "components to be optimized for speed:"
367 while test "$optimize" ; do
369 *,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
370 *) this=$optimize optimize=
375 */*) this=$this*.c ;;
378 OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
380 OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
385 tryflag CFLAGS_AUTO -pipe
388 # If debugging is disabled, omit frame pointer. Modern GCC does this
389 # anyway on most archs even when debugging is enabled since the frame
390 # pointer is no longer needed for debugging.
392 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
394 tryflag CFLAGS_AUTO -fomit-frame-pointer
398 # Modern GCC wants to put DWARF tables (used for debugging and
399 # unwinding) in the loaded part of the program where they are
400 # unstrippable. These options force them back to debug sections (and
401 # cause them not to get generated at all if debugging is off).
403 tryflag CFLAGS_AUTO -fno-unwind-tables
404 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
407 # The GNU toolchain defaults to assuming unmarked files need an
408 # executable stack, potentially exposing vulnerabilities in programs
409 # linked with such object files. Fix this.
411 tryflag CFLAGS_AUTO -Wa,--noexecstack
414 # On x86, make sure we don't have incompatible instruction set
415 # extensions enabled by default. This is bad for making static binaries.
416 # We cheat and use i486 rather than i386 because i386 really does not
417 # work anyway (issues with atomic ops).
418 # Some build environments pass -march and -mtune options via CC, so
419 # check both CC and CFLAGS.
421 if test "$ARCH" = "i386" ; then
422 fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
423 fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
427 # Even with -std=c99, gcc accepts some constructs which are constraint
428 # violations. We want to treat these as errors regardless of whether
429 # other purely stylistic warnings are enabled -- especially implicit
430 # function declarations, which are a dangerous programming error.
432 tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
433 tryflag CFLAGS_AUTO -Werror=implicit-int
434 tryflag CFLAGS_AUTO -Werror=pointer-sign
435 tryflag CFLAGS_AUTO -Werror=pointer-arith
437 if test "x$warnings" = xyes ; then
438 tryflag CFLAGS_AUTO -Wall
439 tryflag CFLAGS_AUTO -Wno-parentheses
440 tryflag CFLAGS_AUTO -Wno-uninitialized
441 tryflag CFLAGS_AUTO -Wno-missing-braces
442 tryflag CFLAGS_AUTO -Wno-unused-value
443 tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
444 tryflag CFLAGS_AUTO -Wno-unknown-pragmas
445 tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
448 if test "x$visibility" = xauto ; then
449 # This test checks toolchain support for several things:
450 # - the -include option
451 # - the attributes/pragmas used in vis.h
452 # - linking code that takes the address of protected symbols
453 printf "checking whether global visibility preinclude works... "
454 echo 'int (*fp)(void);' > "$tmpc"
455 echo 'int foo(void) { }' >> "$tmpc"
456 echo 'int bar(void) { fp = foo; return foo(); }' >> "$tmpc"
457 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
458 -DSHARED -fPIC -I./src/internal -include vis.h \
459 -nostdlib -shared -Wl,-Bsymbolic-functions \
460 -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
465 printf "%s\n" "$visibility"
468 if test "x$visibility" = xyes ; then
469 CFLAGS_AUTO="$CFLAGS_AUTO -include vis.h"
470 CFLAGS_AUTO="${CFLAGS_AUTO# }"
473 # Some patched GCC builds have these defaults messed up...
474 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
476 test "$shared" = "no" || {
477 # Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
479 tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || {
480 test "$shared" = "yes" && fail "$0: error: linker cannot build shared library"
481 printf "warning: disabling dynamic linking support\n"
486 # Find compiler runtime library
487 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
488 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
489 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
490 && tryldflag LIBCC "$try_libcc"
491 printf "using compiler runtime libraries: %s\n" "$LIBCC"
493 # Figure out arch variants for archs with variants
495 t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
497 if test "$ARCH" = "x86_64" ; then
498 trycppif __ILP32__ "$t" && ARCH=x32
501 if test "$ARCH" = "arm" ; then
502 trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
503 trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
506 if test "$ARCH" = "aarch64" ; then
507 trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be
510 if test "$ARCH" = "mips" ; then
511 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
512 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
515 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
516 && SUBARCH=${SUBARCH}el
518 if test "$ARCH" = "sh" ; then
519 trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
520 if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
521 # Some sh configurations are broken and replace double with float
522 # rather than using softfloat when the fpu is present but only
523 # supports single precision. Reject them.
524 printf "checking whether compiler's double type is IEEE double... "
525 echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
526 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
530 fail "$0: error: compiler's floating point configuration is unsupported"
533 SUBARCH=${SUBARCH}-nofpu
538 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
540 case "$ARCH$SUBARCH" in
541 arm) ASMSUBARCH=el ;;
542 *) ASMSUBARCH=$SUBARCH ;;
546 # Some archs (powerpc) have different possible long double formats
547 # that the compiler can be configured for. The logic for whether this
548 # is supported is in bits/float.h; in general, it is not. We need to
549 # check for mismatches here or code in printf, strotd, and scanf will
550 # be dangerously incorrect because it depends on (1) the macros being
551 # correct, and (2) IEEE semantics.
553 printf "checking whether compiler's long double definition matches float.h... "
554 echo '#include <float.h>' > "$tmpc"
555 echo '#if LDBL_MANT_DIG == 53' >> "$tmpc"
556 echo 'typedef char ldcheck[9-(int)sizeof(long double)];' >> "$tmpc"
557 echo '#endif' >> "$tmpc"
558 if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \
559 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
563 fail "$0: error: unsupported long double type"
566 printf "creating config.mak... "
568 cmdline=$(quote "$0")
569 for i ; do cmdline="$cmdline $(quote "$i")" ; done
571 exec 3>&1 1>config.mak
575 # This version of config.mak was generated by:
577 # Any changes made here will be lost if configure is re-run
580 ASMSUBARCH = $ASMSUBARCH
582 exec_prefix = $exec_prefix
585 includedir = $includedir
586 syslibdir = $syslibdir
588 CFLAGS = $CFLAGS_AUTO $CFLAGS
589 CFLAGS_C99FSE = $CFLAGS_C99FSE
590 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
591 CFLAGS_NOSSP = $CFLAGS_NOSSP
593 LDFLAGS = $LDFLAGS_AUTO $LDFLAGS
594 CROSS_COMPILE = $CROSS_COMPILE
596 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
598 TOOL_LIBS = $tool_libs
600 test "x$static" = xno && echo "STATIC_LIBS ="
601 test "x$shared" = xno && echo "SHARED_LIBS ="
602 test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)'