musl/configure
Rich Felker cd31a1fc08 further pcc fixes in configure
-lpcc only works if -nostdlib is not passed, so it's useless. instead,
use -print-file-name to look up the full pathname for libpcc.a, and
check whether that succeeds before trying to link with the result.

also, silence pcc's junk printed on stdout during tests.
2012-10-26 18:15:51 -04:00

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#!/bin/sh
usage () {
cat <<EOF
Usage: $0 [OPTION]... [VAR=VALUE]... [TARGET]
To assign environment variables (e.g., CC, CFLAGS...), specify them as
VAR=VALUE. See below for descriptions of some of the useful variables.
Defaults for the options are specified in brackets.
Installation directories:
--prefix=PREFIX main installation prefix [/usr/local/musl]
--exec-prefix=EPREFIX installation prefix for executable files [PREFIX]
Fine tuning of the installation directories:
--bindir=DIR user executables [EPREFIX/bin]
--libdir=DIR library files for the linker [PREFIX/lib]
--includedir=DIR include files for the C compiler [PREFIX/include]
--syslibdir=DIR location for the dynamic linker [/lib]
System types:
--target=TARGET configure to run on target TARGET [detected]
--host=HOST same as --target
Optional features:
--enable-debug build with debugging information [disabled]
--enable-warnings build with recommended warnings flags [disabled]
--enable-gcc-wrapper build musl-gcc toolchain wrapper [auto]
--disable-shared inhibit building shared library [enabled]
--disable-static inhibit building static library [enabled]
Some influential environment variables:
CC C compiler command [detected]
CFLAGS C compiler flags [-Os -pipe ...]
CROSS_COMPILE prefix for cross compiler and tools [none]
LIBCC compiler runtime library [detected]
Use these variables to override the choices made by configure.
EOF
exit 0
}
# Helper functions
echo () { printf "%s\n" "$*" ; }
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 ; }
setdir () {
if eval "test -z \"\${$1}\"" ; then eval "$1=\$2"
else eval "fnmatch '*/' \"\${$1}\"" && eval "$1=\${$1%/}" ; 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=\${$1# }"
return 0
else
printf "no\n"
return 1
fi
}
# Beginning of actual script
CFLAGS_C99FSE=
CFLAGS_AUTO=
LDFLAGS_AUTO=
prefix=
exec_prefix=
bindir=
libdir=
includedir=
syslibdir=
target=
debug=no
warnings=
shared=yes
static=yes
for arg ; do
case "$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-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
setdir prefix /usr/local/musl
setdir exec_prefix '$(prefix)'
setdir bindir '$(exec_prefix)/bin'
setdir libdir '$(prefix)/lib'
setdir includedir '$(prefix)/include'
setdir syslibdir '/lib'
#
# 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 "$0: cannot find a C compiler" ; exit 1 ; }
#
# Only build musl-gcc wrapper if toolchain does not already target musl
#
if test -z "$wrapper" ; then
printf "checking whether compiler is gcc... "
if fnmatch '*gcc\ version*' "$($CC -v 2>&1)" ; then
echo yes
printf "checking whether to build musl-gcc wrapper... "
wrapper=yes
while read line ; do
case "$line" in */ld-musl-*) wrapper=no ;; esac
done <<EOF
$($CC -dumpspecs)
EOF
echo $wrapper
else
echo no
fi
fi
#
# Find the target architecture
#
printf "checking target system type... "
test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown
printf "%s\n" "$target"
#
# Convert to just ARCH
#
case "$target" in
arm*) ARCH=arm ;;
i?86*) ARCH=i386 ;;
x86_64*) ARCH=x86_64 ;;
mips-*|mipsel-*) ARCH=mips ;;
microblaze-*) ARCH=microblaze ;;
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 "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
tryflag CFLAGS_C99FSE -frounding-math
#
# Setup basic default CFLAGS: debug, optimization, and -pipe
#
if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then :
else
tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
fi
test "x$debug" = xyes && CFLAGS_AUTO="-g"
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 $CFLAGS" ; then :
else
tryflag CFLAGS_AUTO -fomit-frame-pointer
fi
#
# Modern GCC wants to put DWARF tables (used for debugging and
# unwinding) in the loaded part of the program where they are
# unstrippable. These options force them back to debug sections (and
# cause them not to get generated at all if debugging is off).
#
tryflag CFLAGS_AUTO -fno-unwind-tables
tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
#
# The GNU toolchain defaults to assuming unmarked files need an
# executable stack, potentially exposing vulnerabilities in programs
# linked with such object files. Fix this.
#
tryflag CFLAGS_AUTO -Wa,--noexecstack
#
# Some optimization levels add bloated alignment that hurt performance
#
tryflag CFLAGS_AUTO -falign-functions=1
tryflag CFLAGS_AUTO -falign-labels=1
tryflag CFLAGS_AUTO -falign-loops=1
tryflag CFLAGS_AUTO -falign-jumps=1
#
# On x86, make sure we don't have incompatible instruction set
# extensions enabled by default. This is bad for making static binaries.
# We cheat and use i486 rather than i386 because i386 really does not
# work anyway (issues with atomic ops).
#
if test "$ARCH" = "i386" ; then
fnmatch '-march=*|*\ -march=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
fnmatch '-mtune=*|*\ -mtune=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
fi
if test "x$warnings" = xyes ; then
tryflag CFLAGS_AUTO -Wall
tryflag CFLAGS_AUTO -Wpointer-arith
tryflag CFLAGS_AUTO -Wcast-align
tryflag CFLAGS_AUTO -Wno-parentheses
tryflag CFLAGS_AUTO -Wno-uninitialized
tryflag CFLAGS_AUTO -Wno-missing-braces
tryflag CFLAGS_AUTO -Wno-unused-value
tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
tryflag CFLAGS_AUTO -Wno-unknown-pragmas
fi
# Some patched GCC builds have these defaults messed up...
tryflag CFLAGS_AUTO -fno-stack-protector
tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
# Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
LDFLAGS_DUMMY=
tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || {
printf "warning: disabling dynamic linking support\n"
shared=no
}
# Find compiler runtime library
test -z "$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"
printf "creating config.mak... "
exec 3>&1 1>config.mak
cat << EOF
# This version of config.mak was generated by configure
# Any changes made here will be lost if configure is re-run
ARCH = $ARCH
prefix = $prefix
exec_prefix = $exec_prefix
bindir = $bindir
libdir = $libdir
includedir = $includedir
syslibdir = $syslibdir
CC = $CC
CFLAGS= $CFLAGS_AUTO $CFLAGS
CFLAGS_C99FSE = $CFLAGS_C99FSE
CPPFLAGS = $CPPFLAGS
LDFLAGS = $LDFLAGS_AUTO $LDFLAGS
CROSS_COMPILE = $CROSS_COMPILE
LIBCC = $LIBCC
EOF
test "x$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"