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[VAR=VALUE]... [TARGET] To assign environment variables (e.g., CC, CFLAGS...), specify them as VAR=VALUE. See below for descriptions of some of the useful variables. Defaults for the options are specified in brackets. Installation directories: --prefix=PREFIX main installation prefix [/usr/local/musl] --exec-prefix=EPREFIX installation prefix for executable files [PREFIX] Fine tuning of the installation directories: --bindir=DIR user executables [EPREFIX/bin] --libdir=DIR library files for the linker [PREFIX/lib] --includedir=DIR include files for the C compiler [PREFIX/include] --syslibdir=DIR location for the dynamic linker [/lib] System types: --target=TARGET configure to run on target TARGET [detected] --host=HOST same as --target Optional features: --enable-optimize=... optimize listed components for speed over size [auto] --enable-debug build with debugging information [disabled] --enable-warnings build with recommended warnings flags [disabled] --enable-gcc-wrapper build musl-gcc toolchain wrapper [auto] --disable-shared inhibit building shared library [enabled] --disable-static inhibit building static library [enabled] Some influential environment variables: CC C compiler command [detected] CFLAGS C compiler flags [-Os -pipe ...] CROSS_COMPILE prefix for cross compiler and tools [none] LIBCC compiler runtime library [detected] Use these variables to override the choices made by configure. EOF exit 0 } # Helper functions quote () { tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; } $1 EOF printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#" } echo () { printf "%s\n" "$*" ; } fail () { echo "$*" ; exit 1 ; } fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; } cmdexists () { type "$1" >/dev/null 2>&1 ; } trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; } stripdir () { while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done } trycppif () { printf "checking preprocessor condition %s... " "$1" echo "typedef int x;" > "$tmpc" echo "#if $1" >> "$tmpc" echo "#error yes" >> "$tmpc" echo "#endif" >> "$tmpc" if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then printf "false\n" return 1 else printf "true\n" return 0 fi } tryflag () { printf "checking whether compiler accepts %s... " "$2" echo "typedef int x;" > "$tmpc" if $CC "$2" -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then printf "yes\n" eval "$1=\"\${$1} \$2\"" eval "$1=\${$1# }" return 0 else printf "no\n" return 1 fi } tryldflag () { printf "checking whether linker accepts %s... " "$2" echo "typedef int x;" > "$tmpc" if $CC -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then printf "yes\n" eval "$1=\"\${$1} \$2\"" eval "$1=\${$1# }" return 0 else printf "no\n" return 1 fi } # Beginning of actual script CFLAGS_C99FSE= CFLAGS_AUTO= CFLAGS_MEMOPS= LDFLAGS_AUTO= OPTIMIZE_GLOBS= prefix=/usr/local/musl exec_prefix='$(prefix)' bindir='$(exec_prefix)/bin' libdir='$(prefix)/lib' includedir='$(prefix)/include' syslibdir='/lib' target= optimize=auto debug=no warnings=no shared=yes static=yes wrapper=auto for arg ; do case "$arg" in --help) usage ;; --prefix=*) prefix=${arg#*=} ;; --exec-prefix=*) exec_prefix=${arg#*=} ;; --bindir=*) bindir=${arg#*=} ;; --libdir=*) libdir=${arg#*=} ;; --includedir=*) includedir=${arg#*=} ;; --syslibdir=*) syslibdir=${arg#*=} ;; --enable-shared|--enable-shared=yes) shared=yes ;; --disable-shared|--enable-shared=no) shared=no ;; --enable-static|--enable-static=yes) static=yes ;; --disable-static|--enable-static=no) static=no ;; --enable-optimize) optimize=yes ;; --enable-optimize=*) optimize=${arg#*=} ;; --disable-optimize) optimize=no ;; --enable-debug|--enable-debug=yes) debug=yes ;; --disable-debug|--enable-debug=no) debug=no ;; --enable-warnings|--enable-warnings=yes) warnings=yes ;; --disable-warnings|--enable-warnings=no) warnings=no ;; --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ;; --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;; --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;; --host=*|--target=*) target=${arg#*=} ;; -* ) echo "$0: unknown option $arg" ;; CC=*) CC=${arg#*=} ;; CFLAGS=*) CFLAGS=${arg#*=} ;; CPPFLAGS=*) CPPFLAGS=${arg#*=} ;; LDFLAGS=*) LDFLAGS=${arg#*=} ;; CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;; LIBCC=*) LIBCC=${arg#*=} ;; *=*) ;; *) target=$arg ;; esac done for i in prefix exec_prefix bindir libdir includedir syslibdir ; do stripdir $i done # # Get a temp filename we can use # i=0 set -C while : ; do i=$(($i+1)) tmpc="./conf$$-$PPID-$i.c" 2>|/dev/null > "$tmpc" && break test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc" done set +C trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP # # Find a C compiler to use # printf "checking for C compiler... " trycc ${CROSS_COMPILE}gcc trycc ${CROSS_COMPILE}c99 trycc ${CROSS_COMPILE}cc printf "%s\n" "$CC" test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; } printf "checking whether C compiler works... " echo "typedef int x;" > "$tmpc" if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then printf "yes\n" else printf "no; compiler output follows:\n%s\n" "$output" exit 1 fi # # Need to know if the compiler is gcc to decide whether to build the # musl-gcc wrapper, and for critical bug detection in some gcc versions. # printf "checking whether compiler is gcc... " if fnmatch '*gcc\ version*' "$($CC -v 2>&1)" ; then cc_is_gcc=yes else cc_is_gcc=no fi echo "$cc_is_gcc" # # Only build musl-gcc wrapper if toolchain does not already target musl # if test "$wrapper" = auto ; then printf "checking whether to build musl-gcc wrapper... " if test "$cc_is_gcc" = yes ; then wrapper=yes while read line ; do case "$line" in */ld-musl-*) wrapper=no ;; esac done <<EOF $($CC -dumpspecs) EOF else wrapper=no fi echo "$wrapper" fi # # Find the target architecture # printf "checking target system type... " test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown printf "%s\n" "$target" # # Convert to just ARCH # case "$target" in # Catch these early to simplify matching for 32-bit archs mips64*|powerpc64*) fail "$0: unsupported target \"$target\"" ;; arm*) ARCH=arm ;; i?86*) ARCH=i386 ;; x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;; x86_64*) ARCH=x86_64 ;; mips*) ARCH=mips ;; microblaze*) ARCH=microblaze ;; powerpc*) ARCH=powerpc ;; sh[1-9bel-]*|sh|superh*) ARCH=sh ;; unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;; *) fail "$0: unknown or unsupported target \"$target\"" ;; esac # # Try to get a conforming C99 freestanding environment # tryflag CFLAGS_C99FSE -std=c99 tryflag CFLAGS_C99FSE -nostdinc tryflag CFLAGS_C99FSE -ffreestanding \ || tryflag CFLAGS_C99FSE -fno-builtin tryflag CFLAGS_C99FSE -fexcess-precision=standard \ || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; } tryflag CFLAGS_C99FSE -frounding-math # # We may use the may_alias attribute if __GNUC__ is defined, so # if the compiler defines __GNUC__ but does not provide it, # it must be defined away as part of the CFLAGS. # printf "checking whether compiler needs attribute((may_alias)) suppression... " cat > "$tmpc" <<EOF typedef int #ifdef __GNUC__ __attribute__((__may_alias__)) #endif x; EOF if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \ -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then printf "no\n" else printf "yes\n" CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__=" fi # # Check for options that may be needed to prevent the compiler from # generating self-referential versions of memcpy,, memmove, memcmp, # and memset. Really, we should add a check to determine if this # option is sufficient, and if not, add a macro to cripple these # functions with volatile... # tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns # # If debugging is explicitly enabled, don't auto-enable optimizations # if test "$debug" = yes ; then CFLAGS_AUTO=-g test "$optimize" = auto && optimize=no fi # # Possibly add a -O option to CFLAGS and select modules to optimize with # -O3 based on the status of --enable-optimize and provided CFLAGS. # printf "checking for optimization settings... " case "x$optimize" in xauto) if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then printf "using provided CFLAGS\n" ;optimize=no else printf "using defaults\n" ; optimize=yes fi ;; xsize|xnone) printf "minimize size\n" ; optimize=size ;; xno|x) printf "disabled\n" ; optimize=no ;; *) printf "custom\n" ;; esac test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2 test "$optimize" = yes && optimize="internal,malloc,string" if fnmatch 'no|size' "$optimize" ; then : else printf "components to be optimized for speed:" while test "$optimize" ; do case "$optimize" in *,*) this=${optimize%%,*} optimize=${optimize#*,} ;; *) this=$optimize optimize= esac printf " $this" case "$this" in */*.c) ;; */*) this=$this*.c ;; *) this=$this/*.c ;; esac OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this" done OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# } printf "\n" fi # Always try -pipe tryflag CFLAGS_AUTO -pipe # # If debugging is disabled, omit frame pointer. Modern GCC does this # anyway on most archs even when debugging is enabled since the frame # pointer is no longer needed for debugging. # if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then : else tryflag CFLAGS_AUTO -fomit-frame-pointer fi # # Modern GCC wants to put DWARF tables (used for debugging and # unwinding) in the loaded part of the program where they are # unstrippable. These options force them back to debug sections (and # cause them not to get generated at all if debugging is off). # tryflag CFLAGS_AUTO -fno-unwind-tables tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables # # The GNU toolchain defaults to assuming unmarked files need an # executable stack, potentially exposing vulnerabilities in programs # linked with such object files. Fix this. # tryflag CFLAGS_AUTO -Wa,--noexecstack # # On x86, make sure we don't have incompatible instruction set # extensions enabled by default. This is bad for making static binaries. # We cheat and use i486 rather than i386 because i386 really does not # work anyway (issues with atomic ops). # if test "$ARCH" = "i386" ; then fnmatch '-march=*|*\ -march=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -march=i486 fnmatch '-mtune=*|*\ -mtune=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic fi # # Even with -std=c99, gcc accepts some constructs which are constraint # violations. We want to treat these as errors regardless of whether # other purely stylistic warnings are enabled -- especially implicit # function declarations, which are a dangerous programming error. # tryflag CFLAGS_AUTO -Werror=implicit-function-declaration tryflag CFLAGS_AUTO -Werror=implicit-int tryflag CFLAGS_AUTO -Werror=pointer-sign tryflag CFLAGS_AUTO -Werror=pointer-arith if test "x$warnings" = xyes ; then tryflag CFLAGS_AUTO -Wall tryflag CFLAGS_AUTO -Wno-parentheses tryflag CFLAGS_AUTO -Wno-uninitialized tryflag CFLAGS_AUTO -Wno-missing-braces tryflag CFLAGS_AUTO -Wno-unused-value tryflag CFLAGS_AUTO -Wno-unused-but-set-variable tryflag CFLAGS_AUTO -Wno-unknown-pragmas tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast fi # Some patched GCC builds have these defaults messed up... tryflag CFLAGS_AUTO -fno-stack-protector tryldflag LDFLAGS_AUTO -Wl,--hash-style=both # Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions LDFLAGS_DUMMY= tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || { printf "warning: disabling dynamic linking support\n" shared=no } # Find compiler runtime library test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \ && tryldflag LIBCC "$try_libcc" printf "using compiler runtime libraries: %s\n" "$LIBCC" # Figure out arch variants for archs with variants SUBARCH= t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS_AUTO $CFLAGS" if test "$ARCH" = "x86_64" ; then trycppif __ILP32__ "$t" && ARCH=x32 fi if test "$ARCH" = "arm" ; then trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf fi if test "$ARCH" = "mips" ; then trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf fi test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \ && SUBARCH=${SUBARCH}el if test "$ARCH" = "sh" ; then trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then # Some sh configurations are broken and replace double with float # rather than using softfloat when the fpu is present but only # supports single precision. Reject them. printf "checking whether compiler's double type is IEEE double... " echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc" if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then printf "yes\n" else printf "no\n" fail "$0: error: compiler's floating point configuration is unsupported" fi else SUBARCH=${SUBARCH}-nofpu fi fi test "$SUBARCH" \ && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH" case "$ARCH$SUBARCH" in arm) ASMSUBARCH=el ;; *) ASMSUBARCH=$SUBARCH ;; esac # # Some archs (powerpc) have different possible long double formats # that the compiler can be configured for. The logic for whether this # is supported is in bits/float.h; in general, it is not. We need to # check for mismatches here or code in printf, strotd, and scanf will # be dangerously incorrect because it depends on (1) the macros being # correct, and (2) IEEE semantics. # printf "checking whether compiler's long double definition matches float.h... " echo '#include <float.h>' > "$tmpc" echo '#if LDBL_MANT_DIG == 53' >> "$tmpc" echo 'typedef char ldcheck[9-(int)sizeof(long double)];' >> "$tmpc" echo '#endif' >> "$tmpc" if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \ -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then printf "yes\n" else printf "no\n" fail "$0: error: unsupported long double type" fi printf "creating config.mak... " cmdline=$(quote "$0") for i ; do cmdline="$cmdline $(quote "$i")" ; done exec 3>&1 1>config.mak cat << EOF # This version of config.mak was generated by: # $cmdline # Any changes made here will be lost if configure is re-run ARCH = $ARCH SUBARCH = $SUBARCH ASMSUBARCH = $ASMSUBARCH prefix = $prefix exec_prefix = $exec_prefix bindir = $bindir libdir = $libdir includedir = $includedir syslibdir = $syslibdir CC = $CC CFLAGS = $CFLAGS_AUTO $CFLAGS CFLAGS_C99FSE = $CFLAGS_C99FSE CFLAGS_MEMOPS = $CFLAGS_MEMOPS CPPFLAGS = $CPPFLAGS LDFLAGS = $LDFLAGS_AUTO $LDFLAGS CROSS_COMPILE = $CROSS_COMPILE LIBCC = $LIBCC OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS EOF test "x$static" = xno && echo "STATIC_LIBS =" test "x$shared" = xno && echo "SHARED_LIBS =" test "x$wrapper" = xno && echo "ALL_TOOLS =" test "x$wrapper" = xno && echo "TOOL_LIBS =" exec 1>&3 3>&- printf "done\n" |