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='$(prefix)/include'
142 --prefix=*) prefix=${arg#*=} ;;
143 --exec-prefix=*) exec_prefix=${arg#*=} ;;
144 --bindir=*) bindir=${arg#*=} ;;
145 --libdir=*) libdir=${arg#*=} ;;
146 --includedir=*) includedir=${arg#*=} ;;
147 --syslibdir=*) syslibdir=${arg#*=} ;;
148 --enable-shared|--enable-shared=yes) shared=yes ;;
149 --disable-shared|--enable-shared=no) shared=no ;;
150 --enable-static|--enable-static=yes) static=yes ;;
151 --disable-static|--enable-static=no) static=no ;;
152 --enable-optimize) optimize=yes ;;
153 --enable-optimize=*) optimize=${arg#*=} ;;
154 --disable-optimize) optimize=no ;;
155 --enable-debug|--enable-debug=yes) debug=yes ;;
156 --disable-debug|--enable-debug=no) debug=no ;;
157 --enable-warnings|--enable-warnings=yes) warnings=yes ;;
158 --disable-warnings|--enable-warnings=no) warnings=no ;;
159 --enable-visibility|--enable-visibility=yes) visibility=yes ;;
160 --disable-visibility|--enable-visibility=no) visibility=no ;;
161 --enable-wrapper|--enable-wrapper=yes) wrapper=detect ;;
162 --enable-wrapper=all) wrapper=yes ; gcc_wrapper=yes ; clang_wrapper=yes ;;
163 --enable-wrapper=gcc) wrapper=yes ; gcc_wrapper=yes ;;
164 --enable-wrapper=clang) wrapper=yes ; clang_wrapper=yes ;;
165 --disable-wrapper|--enable-wrapper=no) wrapper=no ;;
166 --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;;
167 --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
168 --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
169 --host=*|--target=*) target=${arg#*=} ;;
170 -* ) echo "$0: unknown option $arg" ;;
171 CC=*) CC=${arg#*=} ;;
172 CFLAGS=*) CFLAGS=${arg#*=} ;;
173 CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
174 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
175 CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
176 LIBCC=*) LIBCC=${arg#*=} ;;
182 for i in prefix exec_prefix bindir libdir includedir syslibdir ; do
187 # Get a temp filename we can use
191 while : ; do i=$(($i+1))
192 tmpc="./conf$$-$PPID-$i.c"
193 2>|/dev/null > "$tmpc" && break
194 test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
197 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
200 # Find a C compiler to use
202 printf "checking for C compiler... "
203 trycc ${CROSS_COMPILE}gcc
204 trycc ${CROSS_COMPILE}c99
205 trycc ${CROSS_COMPILE}cc
207 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
209 printf "checking whether C compiler works... "
210 echo "typedef int x;" > "$tmpc"
211 if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then
214 printf "no; compiler output follows:\n%s\n" "$output"
219 # Figure out options to force errors on unknown flags.
221 tryflag CFLAGS_TRY -Werror=unknown-warning-option
222 tryflag CFLAGS_TRY -Werror=unused-command-line-argument
223 tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
224 tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
227 # Need to know if the compiler is gcc or clang to decide which toolchain
230 printf "checking for C compiler family... "
231 cc_ver="$(LC_ALL=C $CC -v 2>&1)"
233 if fnmatch '*gcc\ version*' "$cc_ver" ; then
235 elif fnmatch '*clang\ version*' "$cc_ver" ; then
241 # Figure out toolchain wrapper to build
243 if test "$wrapper" = auto -o "$wrapper" = detect ; then
244 echo "#include <stdlib.h>" > "$tmpc"
245 echo "#if ! __GLIBC__" >> "$tmpc"
246 echo "#error no" >> "$tmpc"
247 echo "#endif" >> "$tmpc"
248 printf "checking for toolchain wrapper to build... "
249 if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
251 elif test "$cc_family" = gcc ; then
254 elif test "$cc_family" = clang ; then
259 if test "$wrapper" = detect ; then
260 fail "$0: could not find an appropriate toolchain wrapper"
265 if test "$gcc_wrapper" = yes ; then
266 tools="$tools tools/musl-gcc"
267 tool_libs="$tool_libs lib/musl-gcc.specs"
269 if test "$clang_wrapper" = yes ; then
270 tools="$tools tools/musl-clang tools/ld.musl-clang"
274 # Find the target architecture
276 printf "checking target system type... "
277 test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown
278 printf "%s\n" "$target"
281 # Convert to just ARCH
284 # Catch these early to simplify matching for 32-bit archs
285 mips64*|powerpc64*) fail "$0: unsupported target \"$target\"" ;;
287 aarch64*) ARCH=aarch64 ;;
289 x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;;
290 x86_64*) ARCH=x86_64 ;;
292 microblaze*) ARCH=microblaze ;;
294 powerpc*) ARCH=powerpc ;;
295 sh[1-9bel-]*|sh|superh*) ARCH=sh ;;
296 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
297 *) fail "$0: unknown or unsupported target \"$target\"" ;;
301 # Try to get a conforming C99 freestanding environment
303 tryflag CFLAGS_C99FSE -std=c99
304 tryflag CFLAGS_C99FSE -nostdinc
305 tryflag CFLAGS_C99FSE -ffreestanding \
306 || tryflag CFLAGS_C99FSE -fno-builtin
307 tryflag CFLAGS_C99FSE -fexcess-precision=standard \
308 || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
309 tryflag CFLAGS_C99FSE -frounding-math
312 # We may use the may_alias attribute if __GNUC__ is defined, so
313 # if the compiler defines __GNUC__ but does not provide it,
314 # it must be defined away as part of the CFLAGS.
316 printf "checking whether compiler needs attribute((may_alias)) suppression... "
320 __attribute__((__may_alias__))
324 if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \
325 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
329 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
333 # Check for options to disable stack protector, which needs to be
334 # disabled for a few early-bootstrap translation units. If not found,
335 # this is not an error; we assume the toolchain does not do ssp.
337 tryflag CFLAGS_NOSSP -fno-stack-protector
340 # Check for options that may be needed to prevent the compiler from
341 # generating self-referential versions of memcpy,, memmove, memcmp,
342 # and memset. Really, we should add a check to determine if this
343 # option is sufficient, and if not, add a macro to cripple these
344 # functions with volatile...
346 tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
349 # Enable debugging if requessted.
351 test "$debug" = yes && CFLAGS_AUTO=-g
354 # Possibly add a -O option to CFLAGS and select modules to optimize with
355 # -O3 based on the status of --enable-optimize and provided CFLAGS.
357 printf "checking for optimization settings... "
360 if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
361 printf "using provided CFLAGS\n" ;optimize=no
363 printf "using defaults\n" ; optimize=yes
366 xsize|xnone) printf "minimize size\n" ; optimize=size ;;
367 xno|x) printf "disabled\n" ; optimize=no ;;
368 *) printf "custom\n" ;;
371 test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
372 test "$optimize" = yes && optimize="internal,malloc,string"
374 if fnmatch 'no|size' "$optimize" ; then :
376 printf "components to be optimized for speed:"
377 while test "$optimize" ; do
379 *,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
380 *) this=$optimize optimize=
385 */*) this=$this*.c ;;
388 OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
390 OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
395 tryflag CFLAGS_AUTO -pipe
398 # If debugging is disabled, omit frame pointer. Modern GCC does this
399 # anyway on most archs even when debugging is enabled since the frame
400 # pointer is no longer needed for debugging.
402 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
404 tryflag CFLAGS_AUTO -fomit-frame-pointer
408 # Modern GCC wants to put DWARF tables (used for debugging and
409 # unwinding) in the loaded part of the program where they are
410 # unstrippable. These options force them back to debug sections (and
411 # cause them not to get generated at all if debugging is off).
413 tryflag CFLAGS_AUTO -fno-unwind-tables
414 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
417 # The GNU toolchain defaults to assuming unmarked files need an
418 # executable stack, potentially exposing vulnerabilities in programs
419 # linked with such object files. Fix this.
421 tryflag CFLAGS_AUTO -Wa,--noexecstack
424 # On x86, make sure we don't have incompatible instruction set
425 # extensions enabled by default. This is bad for making static binaries.
426 # We cheat and use i486 rather than i386 because i386 really does not
427 # work anyway (issues with atomic ops).
428 # Some build environments pass -march and -mtune options via CC, so
429 # check both CC and CFLAGS.
431 if test "$ARCH" = "i386" ; then
432 fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
433 fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
437 # Even with -std=c99, gcc accepts some constructs which are constraint
438 # violations. We want to treat these as errors regardless of whether
439 # other purely stylistic warnings are enabled -- especially implicit
440 # function declarations, which are a dangerous programming error.
442 tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
443 tryflag CFLAGS_AUTO -Werror=implicit-int
444 tryflag CFLAGS_AUTO -Werror=pointer-sign
445 tryflag CFLAGS_AUTO -Werror=pointer-arith
447 if test "x$warnings" = xyes ; then
448 tryflag CFLAGS_AUTO -Wall
449 tryflag CFLAGS_AUTO -Wno-parentheses
450 tryflag CFLAGS_AUTO -Wno-uninitialized
451 tryflag CFLAGS_AUTO -Wno-missing-braces
452 tryflag CFLAGS_AUTO -Wno-unused-value
453 tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
454 tryflag CFLAGS_AUTO -Wno-unknown-pragmas
455 tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
458 if test "x$visibility" = xauto ; then
459 # This test checks toolchain support for several things:
460 # - the -include option
461 # - the attributes/pragmas used in vis.h
462 # - linking code that takes the address of protected symbols
463 printf "checking whether global visibility preinclude works... "
464 echo 'int (*fp)(void);' > "$tmpc"
465 echo 'int foo(void) { }' >> "$tmpc"
466 echo 'int bar(void) { fp = foo; return foo(); }' >> "$tmpc"
467 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
468 -DSHARED -fPIC -I./src/internal -include vis.h \
469 -nostdlib -shared -Wl,-Bsymbolic-functions \
470 -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
475 printf "%s\n" "$visibility"
478 if test "x$visibility" = xyes ; then
479 CFLAGS_AUTO="$CFLAGS_AUTO -include vis.h"
480 CFLAGS_AUTO="${CFLAGS_AUTO# }"
483 # Some patched GCC builds have these defaults messed up...
484 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
486 test "$shared" = "no" || {
487 # Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
489 tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || {
490 test "$shared" = "yes" && fail "$0: error: linker cannot build shared library"
491 printf "warning: disabling dynamic linking support\n"
496 # Find compiler runtime library
497 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
498 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
499 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
500 && tryldflag LIBCC "$try_libcc"
501 printf "using compiler runtime libraries: %s\n" "$LIBCC"
503 # Figure out arch variants for archs with variants
505 t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
507 if test "$ARCH" = "x86_64" ; then
508 trycppif __ILP32__ "$t" && ARCH=x32
511 if test "$ARCH" = "arm" ; then
512 trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
513 trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
516 if test "$ARCH" = "aarch64" ; then
517 trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be
520 if test "$ARCH" = "mips" ; then
521 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
522 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
525 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
526 && SUBARCH=${SUBARCH}el
528 if test "$ARCH" = "sh" ; then
529 trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
530 if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
531 # Some sh configurations are broken and replace double with float
532 # rather than using softfloat when the fpu is present but only
533 # supports single precision. Reject them.
534 printf "checking whether compiler's double type is IEEE double... "
535 echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
536 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
540 fail "$0: error: compiler's floating point configuration is unsupported"
543 SUBARCH=${SUBARCH}-nofpu
548 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
550 case "$ARCH$SUBARCH" in
551 arm) ASMSUBARCH=el ;;
552 *) ASMSUBARCH=$SUBARCH ;;
556 # Some archs (powerpc) have different possible long double formats
557 # that the compiler can be configured for. The logic for whether this
558 # is supported is in bits/float.h; in general, it is not. We need to
559 # check for mismatches here or code in printf, strotd, and scanf will
560 # be dangerously incorrect because it depends on (1) the macros being
561 # correct, and (2) IEEE semantics.
563 printf "checking whether compiler's long double definition matches float.h... "
564 echo '#include <float.h>' > "$tmpc"
565 echo '#if LDBL_MANT_DIG == 53' >> "$tmpc"
566 echo 'typedef char ldcheck[9-(int)sizeof(long double)];' >> "$tmpc"
567 echo '#endif' >> "$tmpc"
568 if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \
569 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
573 fail "$0: error: unsupported long double type"
576 printf "creating config.mak... "
578 cmdline=$(quote "$0")
579 for i ; do cmdline="$cmdline $(quote "$i")" ; done
581 exec 3>&1 1>config.mak
585 # This version of config.mak was generated by:
587 # Any changes made here will be lost if configure is re-run
590 ASMSUBARCH = $ASMSUBARCH
592 exec_prefix = $exec_prefix
595 includedir = $includedir
596 syslibdir = $syslibdir
598 CFLAGS = $CFLAGS_AUTO $CFLAGS
599 CFLAGS_C99FSE = $CFLAGS_C99FSE
600 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
601 CFLAGS_NOSSP = $CFLAGS_NOSSP
603 LDFLAGS = $LDFLAGS_AUTO $LDFLAGS
604 CROSS_COMPILE = $CROSS_COMPILE
606 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
608 TOOL_LIBS = $tool_libs
610 test "x$static" = xno && echo "STATIC_LIBS ="
611 test "x$shared" = xno && echo "SHARED_LIBS ="
612 test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)'
613 test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)'