Defaults for the options are specified in brackets.
+Configuration:
+ --srcdir=DIR source directory [detected]
+
Installation directories:
--prefix=PREFIX main installation prefix [/usr/local/musl]
--exec-prefix=EPREFIX installation prefix for executable files [PREFIX]
System types:
--target=TARGET configure to run on target TARGET [detected]
--host=HOST same as --target
+ --build=BUILD build system type; used only to infer cross-compiling
Optional features:
--enable-optimize=... optimize listed components for speed over size [auto]
LDFLAGS_AUTO=
LDFLAGS_TRY=
OPTIMIZE_GLOBS=
+srcdir=
prefix=/usr/local/musl
exec_prefix='$(prefix)'
bindir='$(exec_prefix)/bin'
syslibdir='/lib'
tools=
tool_libs=
+build=
target=
optimize=auto
debug=no
for arg ; do
case "$arg" in
---help) usage ;;
+--help|-h) usage ;;
+--srcdir=*) srcdir=${arg#*=} ;;
--prefix=*) prefix=${arg#*=} ;;
--exec-prefix=*) exec_prefix=${arg#*=} ;;
--bindir=*) bindir=${arg#*=} ;;
--disable-wrapper|--enable-wrapper=no) wrapper=no ;;
--enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;;
--disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
---enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
+--enable-*|--disable-*|--with-*|--without-*|--*dir=*) ;;
--host=*|--target=*) target=${arg#*=} ;;
+--build=*) build=${arg#*=} ;;
-* ) echo "$0: unknown option $arg" ;;
CC=*) CC=${arg#*=} ;;
CFLAGS=*) CFLAGS=${arg#*=} ;;
CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
LIBCC=*) LIBCC=${arg#*=} ;;
*=*) ;;
-*) target=$arg ;;
+*) build=$arg ; target=$arg ;;
esac
done
-for i in prefix exec_prefix bindir libdir includedir syslibdir ; do
+for i in srcdir prefix exec_prefix bindir libdir includedir syslibdir ; do
stripdir $i
done
+#
+# Get the source dir for out-of-tree builds
+#
+if test -z "$srcdir" ; then
+srcdir="${0%/configure}"
+stripdir srcdir
+fi
+abs_builddir="$(pwd)" || fail "$0: cannot determine working directory"
+abs_srcdir="$(cd $srcdir && pwd)" || fail "$0: invalid source directory $srcdir"
+test "$abs_srcdir" = "$abs_builddir" && srcdir=.
+test "$srcdir" != "." -a -f Makefile -a ! -h Makefile && fail "$0: Makefile already exists in the working directory"
+
#
# Get a temp filename we can use
#
set +C
trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
+#
+# Check whether we are cross-compiling, and set a default
+# CROSS_COMPILE prefix if none was provided.
+#
+test "$target" && \
+test "$target" != "$build" && \
+test -z "$CROSS_COMPILE" && \
+CROSS_COMPILE="$target-"
+
#
# Find a C compiler to use
#
#
tryflag CFLAGS_TRY -Werror=unknown-warning-option
tryflag CFLAGS_TRY -Werror=unused-command-line-argument
+tryflag CFLAGS_TRY -Werror=ignored-optimization-argument
tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
fi
if test "$gcc_wrapper" = yes ; then
-tools="$tools tools/musl-gcc"
+tools="$tools obj/musl-gcc"
tool_libs="$tool_libs lib/musl-gcc.specs"
fi
if test "$clang_wrapper" = yes ; then
-tools="$tools tools/musl-clang tools/ld.musl-clang"
+tools="$tools obj/musl-clang obj/ld.musl-clang"
fi
#
#
case "$target" in
# Catch these early to simplify matching for 32-bit archs
-mips64*|powerpc64*) fail "$0: unsupported target \"$target\"" ;;
arm*) ARCH=arm ;;
aarch64*) ARCH=aarch64 ;;
+i?86-nt32*) ARCH=nt32 ;;
i?86*) ARCH=i386 ;;
x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;;
+x86_64-nt64*) ARCH=nt64 ;;
x86_64*) ARCH=x86_64 ;;
+mips64*|mipsisa64*) ARCH=mips64 ;;
mips*) ARCH=mips ;;
microblaze*) ARCH=microblaze ;;
or1k*) ARCH=or1k ;;
+powerpc64*) ARCH=powerpc64 ;;
powerpc*) ARCH=powerpc ;;
sh[1-9bel-]*|sh|superh*) ARCH=sh ;;
+s390x*) ARCH=s390x ;;
unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
*) fail "$0: unknown or unsupported target \"$target\"" ;;
esac
#endif
x;
EOF
-if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \
+if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
-c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
printf "no\n"
else
CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
fi
+#
+# The GNU toolchain defaults to assuming unmarked files need an
+# executable stack, potentially exposing vulnerabilities in programs
+# linked with such object files. Fix this.
+#
+tryflag CFLAGS_C99FSE -Wa,--noexecstack
+
#
# Check for options to disable stack protector, which needs to be
# disabled for a few early-bootstrap translation units. If not found,
tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
#
-# The GNU toolchain defaults to assuming unmarked files need an
-# executable stack, potentially exposing vulnerabilities in programs
-# linked with such object files. Fix this.
+# Attempt to put each function and each data object in its own
+# section. This both allows additional size optimizations at link
+# time and works around a dangerous class of compiler/assembler bugs
+# whereby relative address expressions are constant-folded by the
+# assembler even when one or more of the symbols involved is
+# replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc.
#
-tryflag CFLAGS_AUTO -Wa,--noexecstack
+tryflag CFLAGS_AUTO -ffunction-sections
+tryflag CFLAGS_AUTO -fdata-sections
#
# On x86, make sure we don't have incompatible instruction set
tryflag CFLAGS_AUTO -Werror=pointer-sign
tryflag CFLAGS_AUTO -Werror=pointer-arith
+#
+# GCC ignores unused arguements by default, but Clang needs this extra
+# parameter to stop printing warnings about LDFLAGS passed during
+# compiling stage and CFLAGS passed during linking stage.
+#
+tryflag CFLAGS_AUTO -Qunused-arguments
+
if test "x$warnings" = xyes ; then
tryflag CFLAGS_AUTO -Wall
tryflag CFLAGS_AUTO -Wno-parentheses
# - the -include option
# - the attributes/pragmas used in vis.h
# - linking code that takes the address of protected symbols
+# - gcc 3.x bug that wrongly claims declarations mismatch
printf "checking whether global visibility preinclude works... "
-echo 'int (*fp)(void);' > "$tmpc"
-echo 'int foo(void) { }' >> "$tmpc"
-echo 'int bar(void) { fp = foo; return foo(); }' >> "$tmpc"
+cat > "$tmpc" <<EOF
+__attribute__((__visibility__("default")))
+extern struct a *const x;
+typedef struct a b;
+extern b *const x;
+b *const x;
+int (*fp)(void);
+int foo(void) { }
+int bar(void) { fp = foo; return foo(); }
+EOF
if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
- -DSHARED -fPIC -I./src/internal -include vis.h \
+ -DSHARED -fPIC -I$srcdir/src/internal -include vis.h \
-nostdlib -shared -Wl,-Bsymbolic-functions \
-o /dev/null "$tmpc" >/dev/null 2>&1 ; then
visibility=yes
CFLAGS_AUTO="${CFLAGS_AUTO# }"
fi
+# Determine if the compiler produces position-independent code (PIC)
+# by default. If so, we don't need to compile separate object files
+# for libc.a and libc.so.
+if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
+pic_default=yes
+else
+pic_default=no
+fi
+
+# Reduce space lost to padding for alignment purposes by sorting data
+# objects according to their alignment reqirements. This approximates
+# optimal packing.
+tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment
+tryldflag LDFLAGS_AUTO -Wl,--sort-common
+
+# When linking shared library, drop dummy weak definitions that were
+# replaced by strong definitions from other translation units.
+tryldflag LDFLAGS_AUTO -Wl,--gc-sections
+
# Some patched GCC builds have these defaults messed up...
tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
-test "$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 "$0: error: linker cannot build shared library"
-printf "warning: disabling dynamic linking support\n"
-shared=no
-}
-}
+# Prevent linking if there are undefined symbols; if any exist,
+# libc.so will crash at runtime during relocation processing.
+# The common way this can happen is failure to link the compiler
+# runtime library; implementation error is also a possibility.
+tryldflag LDFLAGS_AUTO -Wl,--no-undefined
+
+# Avoid exporting symbols from compiler runtime libraries. They
+# should be hidden anyway, but some toolchains including old gcc
+# versions built without shared library support and pcc are broken.
+tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL
+
+# Linking with -Bsymbolic-functions is no longer mandatory for
+# the dynamic linker to work, but enable it if it works as
+# a linking optimization.
+tryldflag LDFLAGS_AUTO -Wl,-Bsymbolic-functions
# Find compiler runtime library
test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
fi
if test "$ARCH" = "arm" ; then
+if trycppif __thumb2__ "$t" ; then
+tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always
+tryflag CFLAGS_AUTO -Wa,-mthumb
+fi
trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
+# Versions of clang up until at least 3.8 have the wrong constraint codes
+# for floating point operands to inline asm. Detect this so the affected
+# source files can just disable the asm.
+if test "$cc_family" = clang ; then
+printf "checking whether clang's vfp asm constraints work... "
+echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc"
+if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
+printf "yes\n"
+else
+printf "no\n"
+CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_VFP_ASM"
+CFLAGS_AUTO="${CFLAGS_AUTO# }"
+fi
+fi
fi
if test "$ARCH" = "aarch64" ; then
fi
if test "$ARCH" = "mips" ; then
+trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
fi
+if test "$ARCH" = "mips64" ; then
+trycppif "_MIPS_SIM != _ABI64" "$t" && ARCH=mipsn32
+trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
+trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
+trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
+fi
+
+if test "$ARCH" = "powerpc" ; then
+trycppif "__NO_FPRS__ && !_SOFT_FLOAT" "$t" && fail \
+ "$0: error: compiler's floating point configuration is unsupported"
+trycppif _SOFT_FLOAT "$t" && SUBARCH=${SUBARCH}-sf
+fi
+
test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
&& SUBARCH=${SUBARCH}el
+if test "$ARCH" = "powerpc64" ; then
+trycppif "_CALL_ELF == 2" "$t" || fail "$0: error: unsupported powerpc64 ABI"
+trycppif __LITTLE_ENDIAN__ "$t" && SUBARCH=${SUBARCH}le
+trycppif _SOFT_FLOAT "$t" && fail "$0: error: soft-float not supported on powerpc64"
+fi
+
if test "$ARCH" = "sh" ; then
+tryflag CFLAGS_AUTO -Wa,--isa=any
trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
# Some sh configurations are broken and replace double with float
fi
if trycppif __SH_FDPIC__ "$t" ; then
SUBARCH=${SUBARCH}-fdpic
-shared=no
fi
fi
echo '#if LDBL_MANT_DIG == 53' >> "$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
+if $CC $CFLAGS_C99FSE \
+ -I$srcdir/arch/$ARCH -I$srcdir/arch/generic -I$srcdir/include \
+ $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
printf "yes\n"
else
printf "no\n"
fail "$0: error: unsupported long double type"
fi
+#
+# Some build systems globally pass in broken CFLAGS like -ffast-math
+# for all packages. On recent GCC we can detect this and error out
+# early rather than producing a seriously-broken math library.
+#
+if trycppif "__FAST_MATH__" \
+ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
+fail "$0: error: compiler has broken floating point; check CFLAGS"
+fi
+
printf "creating config.mak... "
cmdline=$(quote "$0")
ARCH = $ARCH
SUBARCH = $SUBARCH
ASMSUBARCH = $ASMSUBARCH
+srcdir = $srcdir
prefix = $prefix
exec_prefix = $exec_prefix
bindir = $bindir
includedir = $includedir
syslibdir = $syslibdir
CC = $CC
-CFLAGS = $CFLAGS_AUTO $CFLAGS
+CFLAGS = $CFLAGS
+CFLAGS_AUTO = $CFLAGS_AUTO
CFLAGS_C99FSE = $CFLAGS_C99FSE
CFLAGS_MEMOPS = $CFLAGS_MEMOPS
CFLAGS_NOSSP = $CFLAGS_NOSSP
CPPFLAGS = $CPPFLAGS
-LDFLAGS = $LDFLAGS_AUTO $LDFLAGS
+LDFLAGS = $LDFLAGS
+LDFLAGS_AUTO = $LDFLAGS_AUTO
CROSS_COMPILE = $CROSS_COMPILE
LIBCC = $LIBCC
OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
test "x$shared" = xno && echo "SHARED_LIBS ="
test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)'
test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)'
+test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)'
exec 1>&3 3>&-
+test "$srcdir" = "." || ln -sf $srcdir/Makefile .
+
printf "done\n"
projects / musl / blobdiff