From: Rich Felker <dalias@aerifal.cx>
To: musl@lists.openwall.com
Subject: Re: configure script for musl (?!)
Date: Tue, 1 May 2012 19:39:26 -0400 [thread overview]
Message-ID: <20120501233926.GN14673@brightrain.aerifal.cx> (raw)
In-Reply-To: <20120501225408.GM14673@brightrain.aerifal.cx>
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Here's the configure draft..
Rich
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#!/bin/sh
usage () {
cat <<EOF
Usage: $0 [OPTION]... [VAR=VALUE]... [BUILDTYPE]
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 tools [/usr/local]
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]
--build=BUILD same as --target
Optional features:
--enable-debug build libraries with debugging information
--disable-shared inhibit building shared library
--disable-static inhibit building static library
Some influential environment variables:
CC C compiler command [guessed]
CFLAGS C compiler flags [-O2 ...]
Use these variables to override the choices made by configure.
EOF
exit 0
}
# Helper functions
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=\${$1%/}" ; fi
}
tryflag () {
printf "checking whether %s %s works... " "$CC" "$2"
echo "typedef int x;" > "$tmpc"
if "$CC" "$2" -c -o /dev/null "$tmpc" 2>/dev/null ; then
printf "yes\n"
eval "$1=\"\${$1} \$2\""
eval "$1=\${$1# }"
else
printf "no\n"
fi
}
# Beginning of actual script
prefix=
exec_prefix=
bindir=
libdir=
includedir=
syslibdir=
build=
debug=
shared=
static=
for arg ; do
case "$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-*|--disable-*|--with-*|--without-*|--*dir=*|--host=*) ;;
--build=*|--target=*) build=${arg#*=} ;;
-* ) echo "$0: unknown option $arg" ;;
CC=*) CC=${arg#*=} ;;
CFLAGS=*) CFLAGS=${arg#*=} ;;
CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
LDFLAGS=*) LDFLAGS=${arg#*=} ;;
*) build=$arg ;;
esac
done
setdir prefix /usr/local/musl
setdir exec_prefix '/usr/local'
setdir bindir '$(exec_prefix)/bin'
setdir libdir '$(prefix)/lib'
setdir includedir '$(prefix)/include'
setdir syslibdir '/lib'
# Get a temp filename we can use
test -n "$TMPDIR" && tmpc="$TMPDIR/conf$$.c" || tmpc="/tmp/conf$$.c"
set -C
> "$tmpc" || {
echo "$0: cannot create temporary file $tmpc"
exit 1
}
set +C
trap 'rm "$tmpc"' EXIT
# Find a C compiler to use
printf "checking for C compiler... "
trycc gcc
trycc c99
trycc cc
printf "%s\n" "$CC"
test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
# Find the build architecture
printf "checking build system type... "
test -n "$build" || build=$("$CC" -dumpmachine 2>/dev/null) || build=unknown
printf "%s\n" "$build"
# Convert to just ARCH
case "$build" in
arm*) ARCH=arm ;;
i?86*) ARCH=i386 ;;
x86_64*) ARCH=x86_64 ;;
unknown) echo "$0: unable to detect built target; try $0 --build=..." ; exit 1 ;;
*) echo "$0: unknown or unsupported build target \"$build\"" ; exit 1 ;;
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 \
|| tryflag CFLAGS_C99FSE -ffloat-store
# Default CFLAGS
test -z "$CFLAGS" && CFLAGS=-O2
test "x$debug" = xyes && CFLAGS="$CFLAGS -g"
tryflag CFLAGS -pipe
# If debugging is disabled, omit bloated DWARF2 unwind tables & frame ptr
if fnmatch '-g*|*\ -g*' "$CFLAGS" ; then :
else
tryflag CFLAGS -fno-asynchronous-unwind-tables
tryflag CFLAGS -fomit-frame-pointer
fi
# Some optimization levels add bloated alignment that hurt performance
tryflag CFLAGS -falign-functions=1
tryflag CFLAGS -falign-labels=1
tryflag CFLAGS -falign-loops=1
tryflag CFLAGS -falign-jumps=1
if test "$ARCH" = "i386" ; then
fnmatch '-march=*|*\ -march=*' "$CFLAGS" || tryflag CFLAGS -march=i486
fnmatch '-mtune=*|*\ -mtune=*' "$CFLAGS" || tryflag CFLAGS -mtune=generic
fi
exec 1>config.mak
cat << EOF
ARCH = $ARCH
prefix = $prefix
exec_prefix = $exec_prefix
bindir = $bindir
libdir = $libdir
includedir = $includedir
syslibdir = $syslibdir
CC = $CC
CFLAGS = $CFLAGS
CFLAGS_C99FSE = $CFLAGS_C99FSE
CPPFLAGS = $CPPFLAGS
LDFLAGS = $LDFLAGS
EOF
test "x$static" = xno && echo "STATIC_LIBS ="
test "x$shared" = xno && echo "SHARED_LIBS ="
next prev parent reply other threads:[~2012-05-01 23:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-01 22:54 Rich Felker
2012-05-01 23:39 ` Rich Felker [this message]
2012-05-02 14:00 ` Solar Designer
2012-05-02 14:31 ` Rich Felker
2012-05-02 15:05 ` Solar Designer
2012-05-02 15:39 ` Rich Felker
2012-05-02 15:41 ` Solar Designer
2012-05-02 16:26 ` Rich Felker
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