--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]
trycppif () {
printf "checking preprocessor condition %s... " "$1"
-echo "#if $1" > "$tmpc"
+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
CFLAGS_C99FSE=
CFLAGS_AUTO=
+CFLAGS_MEMOPS=
LDFLAGS_AUTO=
+OPTIMIZE_GLOBS=
prefix=/usr/local/musl
exec_prefix='$(prefix)'
bindir='$(exec_prefix)/bin'
includedir='$(prefix)/include'
syslibdir='/lib'
target=
+optimize=auto
debug=no
warnings=no
shared=yes
--disable-shared|--enable-shared=no) shared=no ;;
--enable-static|--enable-static=yes) static=yes ;;
--disable-static|--enable-static=no) static=no ;;
+--enable-optimize) optimize=yes ;;
+--enable-optimize=*) optimize=${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 ;;
tryflag CFLAGS_C99FSE -frounding-math
#
-# Setup basic default CFLAGS: debug, optimization, and -pipe
+# 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.
#
-if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then :
+printf "checking for optimization settings... "
+case "x$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.
test "$SUBARCH" \
&& printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
+#
+# 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... "
exec 3>&1 1>config.mak
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 ="