mirror of
git://git.musl-libc.org/musl
synced 2024-12-28 09:53:24 +00:00
a80847d86a
the motivation for this patch is that the vast majority of libc is code that does not benefit at all from optimizations, but that certain components like string/memory operations can be major performance bottlenecks. at the same time, the old -falign-*=1 options are removed, since they were only beneficial for avoiding bloat when global -O3 was used, and in that case, they may have prevented some of the performance gains. to be the most useful, this patch will need further tuning. in particular, research is needed to determine which components should be built with -O3 by default, and it may be desirable to remove the hard-coded -O3 and instead allow more customization of the optimization level used for selected modules.
419 lines
11 KiB
Bash
Executable File
419 lines
11 KiB
Bash
Executable File
#!/bin/sh
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usage () {
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cat <<EOF
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Usage: $0 [OPTION]... [VAR=VALUE]... [TARGET]
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To assign environment variables (e.g., CC, CFLAGS...), specify them as
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VAR=VALUE. See below for descriptions of some of the useful variables.
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Defaults for the options are specified in brackets.
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Installation directories:
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--prefix=PREFIX main installation prefix [/usr/local/musl]
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--exec-prefix=EPREFIX installation prefix for executable files [PREFIX]
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Fine tuning of the installation directories:
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--bindir=DIR user executables [EPREFIX/bin]
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--libdir=DIR library files for the linker [PREFIX/lib]
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--includedir=DIR include files for the C compiler [PREFIX/include]
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--syslibdir=DIR location for the dynamic linker [/lib]
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System types:
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--target=TARGET configure to run on target TARGET [detected]
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--host=HOST same as --target
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Optional features:
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--enable-optimize=... optimize listed components for speed over size [auto]
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--enable-debug build with debugging information [disabled]
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--enable-warnings build with recommended warnings flags [disabled]
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--enable-gcc-wrapper build musl-gcc toolchain wrapper [auto]
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--disable-shared inhibit building shared library [enabled]
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--disable-static inhibit building static library [enabled]
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Some influential environment variables:
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CC C compiler command [detected]
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CFLAGS C compiler flags [-Os -pipe ...]
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CROSS_COMPILE prefix for cross compiler and tools [none]
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LIBCC compiler runtime library [detected]
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Use these variables to override the choices made by configure.
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EOF
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exit 0
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}
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# Helper functions
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echo () { printf "%s\n" "$*" ; }
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fail () { echo "$*" ; exit 1 ; }
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fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
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cmdexists () { type "$1" >/dev/null 2>&1 ; }
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trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
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stripdir () {
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while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
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}
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trycppif () {
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printf "checking preprocessor condition %s... " "$1"
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echo "typedef int x;" > "$tmpc"
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echo "#if $1" >> "$tmpc"
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echo "#error yes" >> "$tmpc"
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echo "#endif" >> "$tmpc"
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if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
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printf "false\n"
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return 1
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else
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printf "true\n"
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return 0
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fi
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}
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tryflag () {
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printf "checking whether compiler accepts %s... " "$2"
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echo "typedef int x;" > "$tmpc"
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if $CC "$2" -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
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printf "yes\n"
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eval "$1=\"\${$1} \$2\""
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eval "$1=\${$1# }"
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return 0
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else
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printf "no\n"
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return 1
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fi
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}
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tryldflag () {
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printf "checking whether linker accepts %s... " "$2"
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echo "typedef int x;" > "$tmpc"
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if $CC -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
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printf "yes\n"
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eval "$1=\"\${$1} \$2\""
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eval "$1=\${$1# }"
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return 0
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else
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printf "no\n"
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return 1
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fi
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}
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# Beginning of actual script
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CFLAGS_C99FSE=
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CFLAGS_AUTO=
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LDFLAGS_AUTO=
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OPTIMIZE_GLOBS=
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prefix=/usr/local/musl
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exec_prefix='$(prefix)'
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bindir='$(exec_prefix)/bin'
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libdir='$(prefix)/lib'
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includedir='$(prefix)/include'
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syslibdir='/lib'
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target=
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optimize=auto
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debug=no
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warnings=no
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shared=yes
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static=yes
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for arg ; do
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case "$arg" in
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--help) usage ;;
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--prefix=*) prefix=${arg#*=} ;;
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--exec-prefix=*) exec_prefix=${arg#*=} ;;
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--bindir=*) bindir=${arg#*=} ;;
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--libdir=*) libdir=${arg#*=} ;;
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--includedir=*) includedir=${arg#*=} ;;
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--syslibdir=*) syslibdir=${arg#*=} ;;
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--enable-shared|--enable-shared=yes) shared=yes ;;
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--disable-shared|--enable-shared=no) shared=no ;;
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--enable-static|--enable-static=yes) static=yes ;;
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--disable-static|--enable-static=no) static=no ;;
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--enable-optimize) optimize=yes ;;
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--enable-optimize=*) optimize=${arg#*=} ;;
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--disable-optimize) optimize=no ;;
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--enable-debug|--enable-debug=yes) debug=yes ;;
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--disable-debug|--enable-debug=no) debug=no ;;
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--enable-warnings|--enable-warnings=yes) warnings=yes ;;
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--disable-warnings|--enable-warnings=no) warnings=no ;;
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--enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ;;
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--disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
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--enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
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--host=*|--target=*) target=${arg#*=} ;;
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-* ) echo "$0: unknown option $arg" ;;
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CC=*) CC=${arg#*=} ;;
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CFLAGS=*) CFLAGS=${arg#*=} ;;
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CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
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LDFLAGS=*) LDFLAGS=${arg#*=} ;;
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CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
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LIBCC=*) LIBCC=${arg#*=} ;;
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*=*) ;;
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*) target=$arg ;;
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esac
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done
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for i in prefix exec_prefix bindir libdir includedir syslibdir ; do
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stripdir $i
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done
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#
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# Get a temp filename we can use
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#
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i=0
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set -C
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while : ; do i=$(($i+1))
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tmpc="./conf$$-$PPID-$i.c"
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2>|/dev/null > "$tmpc" && break
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test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
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done
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set +C
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trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
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#
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# Find a C compiler to use
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#
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printf "checking for C compiler... "
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trycc ${CROSS_COMPILE}gcc
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trycc ${CROSS_COMPILE}c99
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trycc ${CROSS_COMPILE}cc
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printf "%s\n" "$CC"
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test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
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#
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# Only build musl-gcc wrapper if toolchain does not already target musl
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#
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if test -z "$wrapper" ; then
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printf "checking whether compiler is gcc... "
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if fnmatch '*gcc\ version*' "$($CC -v 2>&1)" ; then
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echo yes
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printf "checking whether to build musl-gcc wrapper... "
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wrapper=yes
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while read line ; do
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case "$line" in */ld-musl-*) wrapper=no ;; esac
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done <<EOF
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$($CC -dumpspecs)
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EOF
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echo $wrapper
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else
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echo no
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fi
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fi
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#
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# Find the target architecture
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#
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printf "checking target system type... "
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test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown
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printf "%s\n" "$target"
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#
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# Convert to just ARCH
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#
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case "$target" in
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arm*) ARCH=arm ;;
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i?86*) ARCH=i386 ;;
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x86_64*) ARCH=x86_64 ;;
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mips-*|mipsel-*) ARCH=mips ;;
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microblaze-*) ARCH=microblaze ;;
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powerpc-*) ARCH=powerpc ;;
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unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
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*) fail "$0: unknown or unsupported target \"$target\"" ;;
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esac
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#
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# Try to get a conforming C99 freestanding environment
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#
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tryflag CFLAGS_C99FSE -std=c99
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tryflag CFLAGS_C99FSE -nostdinc
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tryflag CFLAGS_C99FSE -ffreestanding \
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|| tryflag CFLAGS_C99FSE -fno-builtin
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tryflag CFLAGS_C99FSE -fexcess-precision=standard \
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|| { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
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tryflag CFLAGS_C99FSE -frounding-math
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#
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# If debugging is explicitly enabled, don't auto-enable optimizations
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#
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if test "$debug" = yes ; then
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CFLAGS_AUTO=-g
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test "$optimize" = auto && optimize=no
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fi
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#
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# Possibly add a -O option to CFLAGS and select modules to optimize with
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# -O3 based on the status of --enable-optimize and provided CFLAGS.
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#
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printf "checking for optimization settings... "
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case "x$optimize" in
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xauto)
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if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
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printf "using provided CFLAGS\n" ;optimize=no
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else
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printf "using defaults\n" ; optimize=yes
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fi
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;;
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xsize|xnone) printf "minimize size\n" ; optimize=size ;;
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xno|x) printf "disabled\n" ; optimize=no ;;
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*) printf "custom\n" ;;
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esac
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test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
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test "$optimize" = yes && optimize="internal,malloc,math,string"
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if fnmatch 'no|size' "$optimize" ; then :
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else
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printf "components to be optimized for speed:"
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while test "$optimize" ; do
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case "$optimize" in
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*,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
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*) this=$optimize optimize=
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esac
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printf " $this"
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case "$this" in
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*/*.c) ;;
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*/*) this=$this*.c ;;
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*) this=$this/*.c ;;
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esac
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OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
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done
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OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
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printf "\n"
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fi
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# Always try -pipe
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tryflag CFLAGS_AUTO -pipe
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#
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# If debugging is disabled, omit frame pointer. Modern GCC does this
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# anyway on most archs even when debugging is enabled since the frame
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# pointer is no longer needed for debugging.
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#
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if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
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else
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tryflag CFLAGS_AUTO -fomit-frame-pointer
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fi
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#
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# Modern GCC wants to put DWARF tables (used for debugging and
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# unwinding) in the loaded part of the program where they are
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# unstrippable. These options force them back to debug sections (and
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# cause them not to get generated at all if debugging is off).
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#
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tryflag CFLAGS_AUTO -fno-unwind-tables
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tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
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#
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# The GNU toolchain defaults to assuming unmarked files need an
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# executable stack, potentially exposing vulnerabilities in programs
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# linked with such object files. Fix this.
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#
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tryflag CFLAGS_AUTO -Wa,--noexecstack
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#
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# On x86, make sure we don't have incompatible instruction set
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# extensions enabled by default. This is bad for making static binaries.
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# We cheat and use i486 rather than i386 because i386 really does not
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# work anyway (issues with atomic ops).
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#
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if test "$ARCH" = "i386" ; then
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fnmatch '-march=*|*\ -march=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
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fnmatch '-mtune=*|*\ -mtune=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
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fi
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#
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# Even with -std=c99, gcc accepts some constructs which are constraint
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# violations. We want to treat these as errors regardless of whether
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# other purely stylistic warnings are enabled -- especially implicit
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# function declarations, which are a dangerous programming error.
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#
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tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
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tryflag CFLAGS_AUTO -Werror=implicit-int
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tryflag CFLAGS_AUTO -Werror=pointer-sign
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tryflag CFLAGS_AUTO -Werror=pointer-arith
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if test "x$warnings" = xyes ; then
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tryflag CFLAGS_AUTO -Wall
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tryflag CFLAGS_AUTO -Wcast-align
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tryflag CFLAGS_AUTO -Wno-parentheses
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tryflag CFLAGS_AUTO -Wno-uninitialized
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tryflag CFLAGS_AUTO -Wno-missing-braces
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tryflag CFLAGS_AUTO -Wno-unused-value
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tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
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tryflag CFLAGS_AUTO -Wno-unknown-pragmas
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fi
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# Some patched GCC builds have these defaults messed up...
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tryflag CFLAGS_AUTO -fno-stack-protector
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tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
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# Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
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LDFLAGS_DUMMY=
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tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || {
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printf "warning: disabling dynamic linking support\n"
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shared=no
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}
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# Find compiler runtime library
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test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
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test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
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test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
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&& tryldflag LIBCC "$try_libcc"
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printf "using compiler runtime libraries: %s\n" "$LIBCC"
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# Figure out arch variants for archs with variants
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SUBARCH=
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t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS_AUTO $CFLAGS"
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if test "$ARCH" = "arm" ; then
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trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
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trycppif __SOFTFP__ "$t" || SUBARCH=${SUBARCH}hf
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fi
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test "$ARCH" = "mips" && trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" \
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&& SUBARCH=${SUBARCH}el
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test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
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&& SUBARCH=${SUBARCH}el
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test "$SUBARCH" \
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&& printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
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printf "creating config.mak... "
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exec 3>&1 1>config.mak
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cat << EOF
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# This version of config.mak was generated by configure
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# Any changes made here will be lost if configure is re-run
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ARCH = $ARCH
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SUBARCH = $SUBARCH
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prefix = $prefix
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exec_prefix = $exec_prefix
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bindir = $bindir
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libdir = $libdir
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includedir = $includedir
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syslibdir = $syslibdir
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CC = $CC
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CFLAGS= $CFLAGS_AUTO $CFLAGS
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CFLAGS_C99FSE = $CFLAGS_C99FSE
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CPPFLAGS = $CPPFLAGS
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LDFLAGS = $LDFLAGS_AUTO $LDFLAGS
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CROSS_COMPILE = $CROSS_COMPILE
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LIBCC = $LIBCC
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OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
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EOF
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test "x$static" = xno && echo "STATIC_LIBS ="
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test "x$shared" = xno && echo "SHARED_LIBS ="
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test "x$wrapper" = xno && echo "ALL_TOOLS ="
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test "x$wrapper" = xno && echo "TOOL_LIBS ="
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exec 1>&3 3>&-
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printf "done\n"
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