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-gcc-wrapper build musl-gcc 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 $2 -c -o /dev/null "$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 -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
99 eval "$1=\"\${$1} \$2\""
110 # Beginning of actual script
118 prefix=/usr/local/musl
119 exec_prefix='$(prefix)'
120 bindir='$(exec_prefix)/bin'
121 libdir='$(prefix)/lib'
122 includedir='$(prefix)/include'
136 --prefix=*) prefix=${arg#*=} ;;
137 --exec-prefix=*) exec_prefix=${arg#*=} ;;
138 --bindir=*) bindir=${arg#*=} ;;
139 --libdir=*) libdir=${arg#*=} ;;
140 --includedir=*) includedir=${arg#*=} ;;
141 --syslibdir=*) syslibdir=${arg#*=} ;;
142 --enable-shared|--enable-shared=yes) shared=yes ;;
143 --disable-shared|--enable-shared=no) shared=no ;;
144 --enable-static|--enable-static=yes) static=yes ;;
145 --disable-static|--enable-static=no) static=no ;;
146 --enable-optimize) optimize=yes ;;
147 --enable-optimize=*) optimize=${arg#*=} ;;
148 --disable-optimize) optimize=no ;;
149 --enable-debug|--enable-debug=yes) debug=yes ;;
150 --disable-debug|--enable-debug=no) debug=no ;;
151 --enable-warnings|--enable-warnings=yes) warnings=yes ;;
152 --disable-warnings|--enable-warnings=no) warnings=no ;;
153 --enable-visibility|--enable-visibility=yes) visibility=yes ;;
154 --disable-visibility|--enable-visibility=no) visibility=no ;;
155 --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ;;
156 --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
157 --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
158 --host=*|--target=*) target=${arg#*=} ;;
159 -* ) echo "$0: unknown option $arg" ;;
160 CC=*) CC=${arg#*=} ;;
161 CFLAGS=*) CFLAGS=${arg#*=} ;;
162 CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
163 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
164 CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
165 LIBCC=*) LIBCC=${arg#*=} ;;
171 for i in prefix exec_prefix bindir libdir includedir syslibdir ; do
176 # Get a temp filename we can use
180 while : ; do i=$(($i+1))
181 tmpc="./conf$$-$PPID-$i.c"
182 2>|/dev/null > "$tmpc" && break
183 test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
186 trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
189 # Find a C compiler to use
191 printf "checking for C compiler... "
192 trycc ${CROSS_COMPILE}gcc
193 trycc ${CROSS_COMPILE}c99
194 trycc ${CROSS_COMPILE}cc
196 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
198 printf "checking whether C compiler works... "
199 echo "typedef int x;" > "$tmpc"
200 if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then
203 printf "no; compiler output follows:\n%s\n" "$output"
208 # Need to know if the compiler is gcc to decide whether to build the
209 # musl-gcc wrapper, and for critical bug detection in some gcc versions.
211 printf "checking whether compiler is gcc... "
212 if fnmatch '*gcc\ version*' "$(LC_ALL=C $CC -v 2>&1)" ; then
220 # Only build musl-gcc wrapper if toolchain does not already target musl
222 if test "$wrapper" = auto ; then
223 printf "checking whether to build musl-gcc wrapper... "
224 if test "$cc_is_gcc" = yes ; then
227 case "$line" in */ld-musl-*) wrapper=no ;; esac
240 # Find the target architecture
242 printf "checking target system type... "
243 test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown
244 printf "%s\n" "$target"
247 # Convert to just ARCH
250 # Catch these early to simplify matching for 32-bit archs
251 mips64*|powerpc64*) fail "$0: unsupported target \"$target\"" ;;
253 aarch64*) ARCH=aarch64 ;;
255 x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;;
256 x86_64*) ARCH=x86_64 ;;
258 microblaze*) ARCH=microblaze ;;
260 powerpc*) ARCH=powerpc ;;
261 sh[1-9bel-]*|sh|superh*) ARCH=sh ;;
262 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
263 *) fail "$0: unknown or unsupported target \"$target\"" ;;
267 # Try to get a conforming C99 freestanding environment
269 tryflag CFLAGS_C99FSE -std=c99
270 tryflag CFLAGS_C99FSE -nostdinc
271 tryflag CFLAGS_C99FSE -ffreestanding \
272 || tryflag CFLAGS_C99FSE -fno-builtin
273 tryflag CFLAGS_C99FSE -fexcess-precision=standard \
274 || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
275 tryflag CFLAGS_C99FSE -frounding-math
278 # We may use the may_alias attribute if __GNUC__ is defined, so
279 # if the compiler defines __GNUC__ but does not provide it,
280 # it must be defined away as part of the CFLAGS.
282 printf "checking whether compiler needs attribute((may_alias)) suppression... "
286 __attribute__((__may_alias__))
290 if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \
291 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
295 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
299 # Check for options to disable stack protector, which needs to be
300 # disabled for a few early-bootstrap translation units. If not found,
301 # this is not an error; we assume the toolchain does not do ssp.
303 tryflag CFLAGS_NOSSP -fno-stack-protector
306 # Check for options that may be needed to prevent the compiler from
307 # generating self-referential versions of memcpy,, memmove, memcmp,
308 # and memset. Really, we should add a check to determine if this
309 # option is sufficient, and if not, add a macro to cripple these
310 # functions with volatile...
312 tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
315 # Enable debugging if requessted.
317 test "$debug" = yes && CFLAGS_AUTO=-g
320 # Possibly add a -O option to CFLAGS and select modules to optimize with
321 # -O3 based on the status of --enable-optimize and provided CFLAGS.
323 printf "checking for optimization settings... "
326 if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
327 printf "using provided CFLAGS\n" ;optimize=no
329 printf "using defaults\n" ; optimize=yes
332 xsize|xnone) printf "minimize size\n" ; optimize=size ;;
333 xno|x) printf "disabled\n" ; optimize=no ;;
334 *) printf "custom\n" ;;
337 test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
338 test "$optimize" = yes && optimize="internal,malloc,string"
340 if fnmatch 'no|size' "$optimize" ; then :
342 printf "components to be optimized for speed:"
343 while test "$optimize" ; do
345 *,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
346 *) this=$optimize optimize=
351 */*) this=$this*.c ;;
354 OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
356 OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
361 tryflag CFLAGS_AUTO -pipe
364 # If debugging is disabled, omit frame pointer. Modern GCC does this
365 # anyway on most archs even when debugging is enabled since the frame
366 # pointer is no longer needed for debugging.
368 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
370 tryflag CFLAGS_AUTO -fomit-frame-pointer
374 # Modern GCC wants to put DWARF tables (used for debugging and
375 # unwinding) in the loaded part of the program where they are
376 # unstrippable. These options force them back to debug sections (and
377 # cause them not to get generated at all if debugging is off).
379 tryflag CFLAGS_AUTO -fno-unwind-tables
380 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
383 # The GNU toolchain defaults to assuming unmarked files need an
384 # executable stack, potentially exposing vulnerabilities in programs
385 # linked with such object files. Fix this.
387 tryflag CFLAGS_AUTO -Wa,--noexecstack
390 # On x86, make sure we don't have incompatible instruction set
391 # extensions enabled by default. This is bad for making static binaries.
392 # We cheat and use i486 rather than i386 because i386 really does not
393 # work anyway (issues with atomic ops).
394 # Some build environments pass -march and -mtune options via CC, so
395 # check both CC and CFLAGS.
397 if test "$ARCH" = "i386" ; then
398 fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
399 fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
403 # Even with -std=c99, gcc accepts some constructs which are constraint
404 # violations. We want to treat these as errors regardless of whether
405 # other purely stylistic warnings are enabled -- especially implicit
406 # function declarations, which are a dangerous programming error.
408 tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
409 tryflag CFLAGS_AUTO -Werror=implicit-int
410 tryflag CFLAGS_AUTO -Werror=pointer-sign
411 tryflag CFLAGS_AUTO -Werror=pointer-arith
413 if test "x$warnings" = xyes ; then
414 tryflag CFLAGS_AUTO -Wall
415 tryflag CFLAGS_AUTO -Wno-parentheses
416 tryflag CFLAGS_AUTO -Wno-uninitialized
417 tryflag CFLAGS_AUTO -Wno-missing-braces
418 tryflag CFLAGS_AUTO -Wno-unused-value
419 tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
420 tryflag CFLAGS_AUTO -Wno-unknown-pragmas
421 tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
424 if test "x$visibility" = xauto ; then
425 # This test checks toolchain support for several things:
426 # - the -include option
427 # - the attributes/pragmas used in vis.h
428 # - linking code that takes the address of protected symbols
429 printf "checking whether global visibility preinclude works... "
430 echo 'int (*fp)(void);' > "$tmpc"
431 echo 'int foo(void) { }' >> "$tmpc"
432 echo 'int bar(void) { fp = foo; return foo(); }' >> "$tmpc"
433 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
434 -DSHARED -fPIC -I./src/internal -include vis.h \
435 -nostdlib -shared -Wl,-Bsymbolic-functions \
436 -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
441 printf "%s\n" "$visibility"
444 if test "x$visibility" = xyes ; then
445 CFLAGS_AUTO="$CFLAGS_AUTO -include vis.h"
446 CFLAGS_AUTO="${CFLAGS_AUTO# }"
449 # Some patched GCC builds have these defaults messed up...
450 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
452 test "$shared" = "no" || {
453 # Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
455 tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || {
456 test "$shared" = "yes" && fail "$0: error: linker cannot build shared library"
457 printf "warning: disabling dynamic linking support\n"
462 # Find compiler runtime library
463 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
464 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
465 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
466 && tryldflag LIBCC "$try_libcc"
467 printf "using compiler runtime libraries: %s\n" "$LIBCC"
469 # Figure out arch variants for archs with variants
471 t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
473 if test "$ARCH" = "x86_64" ; then
474 trycppif __ILP32__ "$t" && ARCH=x32
477 if test "$ARCH" = "arm" ; then
478 trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
479 trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
482 if test "$ARCH" = "aarch64" ; then
483 trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be
486 if test "$ARCH" = "mips" ; then
487 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
488 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
491 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
492 && SUBARCH=${SUBARCH}el
494 if test "$ARCH" = "sh" ; then
495 trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
496 if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
497 # Some sh configurations are broken and replace double with float
498 # rather than using softfloat when the fpu is present but only
499 # supports single precision. Reject them.
500 printf "checking whether compiler's double type is IEEE double... "
501 echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
502 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
506 fail "$0: error: compiler's floating point configuration is unsupported"
509 SUBARCH=${SUBARCH}-nofpu
514 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
516 case "$ARCH$SUBARCH" in
517 arm) ASMSUBARCH=el ;;
518 *) ASMSUBARCH=$SUBARCH ;;
522 # Some archs (powerpc) have different possible long double formats
523 # that the compiler can be configured for. The logic for whether this
524 # is supported is in bits/float.h; in general, it is not. We need to
525 # check for mismatches here or code in printf, strotd, and scanf will
526 # be dangerously incorrect because it depends on (1) the macros being
527 # correct, and (2) IEEE semantics.
529 printf "checking whether compiler's long double definition matches float.h... "
530 echo '#include <float.h>' > "$tmpc"
531 echo '#if LDBL_MANT_DIG == 53' >> "$tmpc"
532 echo 'typedef char ldcheck[9-(int)sizeof(long double)];' >> "$tmpc"
533 echo '#endif' >> "$tmpc"
534 if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \
535 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
539 fail "$0: error: unsupported long double type"
542 printf "creating config.mak... "
544 cmdline=$(quote "$0")
545 for i ; do cmdline="$cmdline $(quote "$i")" ; done
547 exec 3>&1 1>config.mak
551 # This version of config.mak was generated by:
553 # Any changes made here will be lost if configure is re-run
556 ASMSUBARCH = $ASMSUBARCH
558 exec_prefix = $exec_prefix
561 includedir = $includedir
562 syslibdir = $syslibdir
564 CFLAGS = $CFLAGS_AUTO $CFLAGS
565 CFLAGS_C99FSE = $CFLAGS_C99FSE
566 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
567 CFLAGS_NOSSP = $CFLAGS_NOSSP
569 LDFLAGS = $LDFLAGS_AUTO $LDFLAGS
570 CROSS_COMPILE = $CROSS_COMPILE
572 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
574 test "x$static" = xno && echo "STATIC_LIBS ="
575 test "x$shared" = xno && echo "SHARED_LIBS ="
576 test "x$wrapper" = xno && echo "ALL_TOOLS ="
577 test "x$wrapper" = xno && echo "TOOL_LIBS ="