--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]
# 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" ; }
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"
CFLAGS_C99FSE=
CFLAGS_AUTO=
+CFLAGS_MEMOPS=
LDFLAGS_AUTO=
+OPTIMIZE_GLOBS=
prefix=/usr/local/musl
exec_prefix='$(prefix)'
bindir='$(exec_prefix)/bin'
includedir='$(prefix)/include'
syslibdir='/lib'
target=
+optimize=auto
debug=no
warnings=no
-shared=yes
+shared=auto
static=yes
+wrapper=auto
for arg ; do
case "$arg" in
--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=${arg#*=} ;;
+--disable-optimize) optimize=no ;;
--enable-debug|--enable-debug=yes) debug=yes ;;
--disable-debug|--enable-debug=no) debug=no ;;
--enable-warnings|--enable-warnings=yes) warnings=yes ;;
printf "%s\n" "$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" "$output"
+exit 1
+fi
+
#
-# Only build musl-gcc wrapper if toolchain does not already target musl
+# Need to know if the compiler is gcc to decide whether to build the
+# musl-gcc wrapper, and for critical bug detection in some gcc versions.
#
-if test -z "$wrapper" ; then
printf "checking whether compiler is gcc... "
if fnmatch '*gcc\ version*' "$($CC -v 2>&1)" ; then
-echo yes
+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
-echo $wrapper
else
-echo no
+wrapper=no
fi
+echo "$wrapper"
fi
# 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-*|mipsel-*) ARCH=mips ;;
-microblaze-*) ARCH=microblaze ;;
-powerpc-*) ARCH=powerpc ;;
+mips*) ARCH=mips ;;
+microblaze*) ARCH=microblaze ;;
+or1k*) ARCH=or1k ;;
+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
tryflag CFLAGS_C99FSE -frounding-math
#
-# Setup basic default CFLAGS: debug, optimization, and -pipe
+# 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="$CFLAGS_C99FSE -D__may_alias__="
+fi
+
+#
+# Check for options that may be needed to prevent the compiler from
+# generating self-referential versions of memcpy,, memmove, memcmp,
+# and memset. Really, we should add a check to determine if this
+# option is sufficient, and if not, add a macro to cripple these
+# functions with volatile...
+#
+tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
+
#
-if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then :
+# Enable debugging if requessted.
+#
+test "$debug" = yes && CFLAGS_AUTO=-g
+
+#
+# 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 $CFLAGS" ; then
+printf "using provided CFLAGS\n" ;optimize=no
else
-tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
+printf "using defaults\n" ; optimize=yes
fi
-test "x$debug" = xyes && CFLAGS_AUTO="-g"
+;;
+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
#
#
tryflag CFLAGS_AUTO -Wa,--noexecstack
-#
-# Some optimization levels add bloated alignment that hurt performance
-#
-tryflag CFLAGS_AUTO -falign-functions=1
-tryflag CFLAGS_AUTO -falign-labels=1
-tryflag CFLAGS_AUTO -falign-loops=1
-tryflag CFLAGS_AUTO -falign-jumps=1
-
#
# On x86, make sure we don't have incompatible instruction set
# extensions enabled by default. This is bad for making static binaries.
if test "x$warnings" = xyes ; then
tryflag CFLAGS_AUTO -Wall
-tryflag CFLAGS_AUTO -Wcast-align
tryflag CFLAGS_AUTO -Wno-parentheses
tryflag CFLAGS_AUTO -Wno-uninitialized
tryflag CFLAGS_AUTO -Wno-missing-braces
tryflag CFLAGS_AUTO -Wno-unused-value
tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
tryflag CFLAGS_AUTO -Wno-unknown-pragmas
+tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
fi
# Some patched GCC builds have these defaults messed up...
tryflag CFLAGS_AUTO -fno-stack-protector
tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
+test "$shared" = "no" || {
# Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
LDFLAGS_DUMMY=
tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || {
+test "$shared" = "yes" && fail "$0: error: linker cannot build shared library"
printf "warning: disabling dynamic linking support\n"
shared=no
}
+}
# Find compiler runtime library
test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
&& 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 configure
+# 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
includedir = $includedir
syslibdir = $syslibdir
CC = $CC
-CFLAGS= $CFLAGS_AUTO $CFLAGS
+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 ="