blob: 1e8b974194638e9265b9cad44b8c47ace8e79df7 [file] [log] [blame]
Rich Felker64d2f8e2012-05-04 23:24:51 -04001#!/bin/sh
2
3usage () {
4cat <<EOF
Rich Felker278883d2012-06-03 16:22:13 -04005Usage: $0 [OPTION]... [VAR=VALUE]... [TARGET]
Rich Felker64d2f8e2012-05-04 23:24:51 -04006
7To assign environment variables (e.g., CC, CFLAGS...), specify them as
8VAR=VALUE. See below for descriptions of some of the useful variables.
9
10Defaults for the options are specified in brackets.
11
12Installation directories:
13 --prefix=PREFIX main installation prefix [/usr/local/musl]
14 --exec-prefix=EPREFIX installation prefix for executable files [PREFIX]
15
16Fine tuning of the installation directories:
17 --bindir=DIR user executables [EPREFIX/bin]
18 --libdir=DIR library files for the linker [PREFIX/lib]
19 --includedir=DIR include files for the C compiler [PREFIX/include]
20 --syslibdir=DIR location for the dynamic linker [/lib]
21
22System types:
23 --target=TARGET configure to run on target TARGET [detected]
Rich Felker278883d2012-06-03 16:22:13 -040024 --host=HOST same as --target
Rich Felker64d2f8e2012-05-04 23:24:51 -040025
26Optional features:
27 --enable-debug build with debugging information [disabled]
28 --enable-warnings build with recommended warnings flags [disabled]
29 --enable-gcc-wrapper build musl-gcc toolchain wrapper [auto]
30 --disable-shared inhibit building shared library [enabled]
31 --disable-static inhibit building static library [enabled]
32
33Some influential environment variables:
34 CC C compiler command [detected]
35 CFLAGS C compiler flags [-Os -pipe ...]
Rich Felker94e920d2012-08-14 22:50:16 -040036 CROSS_COMPILE prefix for cross compiler and tools [none]
Rich Felker64d2f8e2012-05-04 23:24:51 -040037
38Use these variables to override the choices made by configure.
39
40EOF
41exit 0
42}
43
44# Helper functions
45
46echo () { printf "%s\n" "$*" ; }
47fail () { echo "$*" ; exit 1 ; }
48fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
49cmdexists () { type "$1" >/dev/null 2>&1 ; }
50trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
51
52setdir () {
53if eval "test -z \"\${$1}\"" ; then eval "$1=\$2"
54else eval "fnmatch '*/' \"\${$1}\"" && eval "$1=\${$1%/}" ; fi
55}
56
57tryflag () {
58printf "checking whether compiler accepts %s... " "$2"
59echo "typedef int x;" > "$tmpc"
60if "$CC" "$2" -c -o /dev/null "$tmpc" 2>/dev/null ; then
61printf "yes\n"
62eval "$1=\"\${$1} \$2\""
63eval "$1=\${$1# }"
64return 0
65else
66printf "no\n"
67return 1
68fi
69}
70
Rich Felker08f70a32012-06-06 20:45:52 -040071tryldflag () {
72printf "checking whether linker accepts %s... " "$2"
Rich Felker67a03832012-06-07 00:23:58 -040073echo "typedef int x;" > "$tmpc"
Rich Felkerf1fd7572012-06-07 00:27:34 -040074if "$CC" -nostdlib -shared "$2" -o /dev/null "$tmpc" 2>/dev/null ; then
Rich Felker08f70a32012-06-06 20:45:52 -040075printf "yes\n"
76eval "$1=\"\${$1} \$2\""
77eval "$1=\${$1# }"
78return 0
79else
80printf "no\n"
81return 1
82fi
83}
84
Rich Felker64d2f8e2012-05-04 23:24:51 -040085
86
87# Beginning of actual script
88
Rich Felker08f70a32012-06-06 20:45:52 -040089CFLAGS_C99FSE=
90CFLAGS_AUTO=
91LDFLAGS_AUTO=
Rich Felker64d2f8e2012-05-04 23:24:51 -040092prefix=
93exec_prefix=
94bindir=
95libdir=
96includedir=
97syslibdir=
Rich Felker278883d2012-06-03 16:22:13 -040098target=
Rich Felker64d2f8e2012-05-04 23:24:51 -040099debug=no
100warnings=
101shared=yes
102static=yes
103
104for arg ; do
105case "$arg" in
106--help) usage ;;
107--prefix=*) prefix=${arg#*=} ;;
108--exec-prefix=*) exec_prefix=${arg#*=} ;;
109--bindir=*) bindir=${arg#*=} ;;
110--libdir=*) libdir=${arg#*=} ;;
111--includedir=*) includedir=${arg#*=} ;;
112--syslibdir=*) syslibdir=${arg#*=} ;;
113--enable-shared|--enable-shared=yes) shared=yes ;;
114--disable-shared|--enable-shared=no) shared=no ;;
115--enable-static|--enable-static=yes) static=yes ;;
116--disable-static|--enable-static=no) static=no ;;
117--enable-debug|--enable-debug=yes) debug=yes ;;
118--disable-debug|--enable-debug=no) debug=no ;;
119--enable-warnings|--enable-warnings=yes) warnings=yes ;;
120--disable-warnings|--enable-warnings=no) warnings=no ;;
121--enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ;;
122--disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
Rich Felker278883d2012-06-03 16:22:13 -0400123--enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
124--host=*|--target=*) target=${arg#*=} ;;
Rich Felker64d2f8e2012-05-04 23:24:51 -0400125-* ) echo "$0: unknown option $arg" ;;
126CC=*) CC=${arg#*=} ;;
127CFLAGS=*) CFLAGS=${arg#*=} ;;
128CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
129LDFLAGS=*) LDFLAGS=${arg#*=} ;;
Rich Felker94e920d2012-08-14 22:50:16 -0400130CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;;
Rich Felker278883d2012-06-03 16:22:13 -0400131*=*) ;;
132*) target=$arg ;;
Rich Felker64d2f8e2012-05-04 23:24:51 -0400133esac
134done
135
136setdir prefix /usr/local/musl
137setdir exec_prefix '$(prefix)'
138setdir bindir '$(exec_prefix)/bin'
139setdir libdir '$(prefix)/lib'
140setdir includedir '$(prefix)/include'
141setdir syslibdir '/lib'
142
143#
144# Get a temp filename we can use
145#
146i=0
147set -C
148while : ; do i=$(($i+1))
149tmpc="./conf$$-$PPID-$i.c"
1502>/dev/null > "$tmpc" && break
151test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
152done
153set +C
154trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
155
156#
157# Find a C compiler to use
158#
159printf "checking for C compiler... "
Rich Felker94e920d2012-08-14 22:50:16 -0400160trycc ${CROSS_COMPILE}gcc
161trycc ${CROSS_COMPILE}c99
162trycc ${CROSS_COMPILE}cc
Rich Felker64d2f8e2012-05-04 23:24:51 -0400163printf "%s\n" "$CC"
164test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
165
166#
167# Only build musl-gcc wrapper if toolchain does not already target musl
168#
169if test -z "$wrapper" ; then
170printf "checking whether compiler is gcc... "
Rich Felkerc5f3add2012-05-14 14:52:55 -0400171if fnmatch '*gcc\ version*' "$("$CC" -v 2>&1)" ; then
Rich Felker64d2f8e2012-05-04 23:24:51 -0400172echo yes
173printf "checking whether to build musl-gcc wrapper... "
174wrapper=yes
175while read line ; do
176case "$line" in */ld-musl-*) wrapper=no ;; esac
177done <<EOF
178$($CC -dumpspecs)
179EOF
180echo $wrapper
181else
182echo no
183fi
184fi
185
186
187
188#
Rich Felker278883d2012-06-03 16:22:13 -0400189# Find the target architecture
Rich Felker64d2f8e2012-05-04 23:24:51 -0400190#
Rich Felker278883d2012-06-03 16:22:13 -0400191printf "checking target system type... "
192test -n "$target" || target=$("$CC" -dumpmachine 2>/dev/null) || target=unknown
193printf "%s\n" "$target"
Rich Felker64d2f8e2012-05-04 23:24:51 -0400194
195#
196# Convert to just ARCH
197#
Rich Felker278883d2012-06-03 16:22:13 -0400198case "$target" in
Rich Felker64d2f8e2012-05-04 23:24:51 -0400199arm*) ARCH=arm ;;
200i?86*) ARCH=i386 ;;
201x86_64*) ARCH=x86_64 ;;
Rich Felker721564a2012-08-05 17:23:38 -0400202mips-*|mipsel-*) ARCH=mips ;;
Rich Felker278883d2012-06-03 16:22:13 -0400203unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
204*) fail "$0: unknown or unsupported target \"$target\"" ;;
Rich Felker64d2f8e2012-05-04 23:24:51 -0400205esac
206
207#
208# Try to get a conforming C99 freestanding environment
209#
210tryflag CFLAGS_C99FSE -std=c99
211tryflag CFLAGS_C99FSE -nostdinc
212tryflag CFLAGS_C99FSE -ffreestanding \
213|| tryflag CFLAGS_C99FSE -fno-builtin
214tryflag CFLAGS_C99FSE -fexcess-precision=standard \
Rich Felker2121b8a2012-07-03 23:53:05 -0400215|| { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
Rich Felkerb4ccc3c2012-05-05 17:18:31 -0400216tryflag CFLAGS_C99FSE -frounding-math
Rich Felker64d2f8e2012-05-04 23:24:51 -0400217
218#
219# Setup basic default CFLAGS: debug, optimization, and -pipe
220#
221if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then :
222else
223tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
224fi
225test "x$debug" = xyes && CFLAGS_AUTO="-g"
226tryflag CFLAGS_AUTO -pipe
227
228#
229# If debugging is disabled, omit bloated DWARF2 unwind tables & frame ptr
230#
231if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
232else
233tryflag CFLAGS_AUTO -fno-unwind-tables
234tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
235tryflag CFLAGS_AUTO -fomit-frame-pointer
236fi
237
238#
239# Some optimization levels add bloated alignment that hurt performance
240#
241tryflag CFLAGS_AUTO -falign-functions=1
242tryflag CFLAGS_AUTO -falign-labels=1
243tryflag CFLAGS_AUTO -falign-loops=1
244tryflag CFLAGS_AUTO -falign-jumps=1
245
246#
247# On x86, make sure we don't have incompatible instruction set
248# extensions enabled by default. This is bad for making static binaries.
249# We cheat and use i486 rather than i386 because i386 really does not
250# work anyway (issues with atomic ops).
251#
252if test "$ARCH" = "i386" ; then
253fnmatch '-march=*|*\ -march=*' "$CFLAGS" || tryflag CFLAGS_AUTO -march=i486
254fnmatch '-mtune=*|*\ -mtune=*' "$CFLAGS" || tryflag CFLAGS_AUTO -mtune=generic
255fi
256
257if test "x$warnings" = xyes ; then
258tryflag CFLAGS_AUTO -Wall
259tryflag CFLAGS_AUTO -Wpointer-arith
260tryflag CFLAGS_AUTO -Wcast-align
261tryflag CFLAGS_AUTO -Wno-parentheses
262tryflag CFLAGS_AUTO -Wno-uninitialized
263tryflag CFLAGS_AUTO -Wno-missing-braces
264tryflag CFLAGS_AUTO -Wno-unused-value
265tryflag CFLAGS_AUTO -Wno-unused-but-set-variable
266tryflag CFLAGS_AUTO -Wno-unknown-pragmas
267fi
268
Rich Felker0c5efde2012-06-06 22:00:08 -0400269# Some patched GCC builds have these defaults messed up...
270tryflag CFLAGS_AUTO -fno-stack-protector
Rich Felker08f70a32012-06-06 20:45:52 -0400271tryldflag LDFLAGS_AUTO -Wl,--hash-style=sysv
272
Rich Felker498a1002012-06-07 00:32:22 -0400273# Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
274LDFLAGS_DUMMY=
275tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || {
276printf "warning: disabling dynamic linking support\n"
277shared=no
278}
279
Rich Felkera1546e82012-07-12 14:24:10 -0400280
Rich Felker64d2f8e2012-05-04 23:24:51 -0400281
282printf "creating config.mak... "
283
284exec 3>&1 1>config.mak
285
286
287cat << EOF
288# This version of config.mak was generated by configure
289# Any changes made here will be lost if configure is re-run
290ARCH = $ARCH
291prefix = $prefix
292exec_prefix = $exec_prefix
293bindir = $bindir
294libdir = $libdir
295includedir = $includedir
296syslibdir = $syslibdir
297CC = $CC
298CFLAGS= $CFLAGS_AUTO $CFLAGS
299CFLAGS_C99FSE = $CFLAGS_C99FSE
300CPPFLAGS = $CPPFLAGS
Rich Felker08f70a32012-06-06 20:45:52 -0400301LDFLAGS = $LDFLAGS_AUTO $LDFLAGS
Rich Felker94e920d2012-08-14 22:50:16 -0400302CROSS_COMPILE = $CROSS_COMPILE
Rich Felker64d2f8e2012-05-04 23:24:51 -0400303EOF
304test "x$static" = xno && echo "STATIC_LIBS ="
305test "x$shared" = xno && echo "SHARED_LIBS ="
306test "x$wrapper" = xno && echo "ALL_TOOLS ="
307test "x$wrapper" = xno && echo "TOOL_LIBS ="
308exec 1>&3 3>&-
309
310printf "done\n"