summaryrefslogtreecommitdiff
path: root/configure
blob: 673d2913572b149f1d196e2d3c9c667c96043aea (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
#!/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-optimize=...   optimize listed components for speed over size [auto]
  --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

quote () {
tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
$1
EOF
printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
}
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 ; }

stripdir () {
while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
}

trycppif () {
printf "checking preprocessor condition %s... " "$1"
echo "typedef int x;" > "$tmpc"
echo "#if $1" >> "$tmpc"
echo "#error yes" >> "$tmpc"
echo "#endif" >> "$tmpc"
if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
printf "false\n"
return 1
else
printf "true\n"
return 0
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=
CFLAGS_MEMOPS=
LDFLAGS_AUTO=
OPTIMIZE_GLOBS=
prefix=/usr/local/musl
exec_prefix='$(prefix)'
bindir='$(exec_prefix)/bin'
libdir='$(prefix)/lib'
includedir='$(prefix)/include'
syslibdir='/lib'
target=
optimize=auto
debug=no
warnings=no
shared=auto
static=yes
wrapper=auto

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=${arg#*=} ;;
--enable-shared|--enable-shared=yes) shared=yes ;;
--disable-shared|--enable-shared=no) shared=no ;;
--enable-static|--enable-static=yes) static=yes ;;
--disable-static|--enable-static=no) static=no ;;
--enable-optimize) optimize=yes ;;
--enable-optimize=*) optimize=${arg#*=} ;;
--disable-optimize) optimize=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

for i in prefix exec_prefix bindir libdir includedir syslibdir ; do
stripdir $i
done

#
# 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 ; }

printf "checking whether C compiler works... "
echo "typedef int x;" > "$tmpc"
if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then
printf "yes\n"
else
printf "no; compiler output follows:\n%s\n" "$output"
exit 1
fi

#
# Need to know if the compiler is gcc to decide whether to build the
# musl-gcc wrapper, and for critical bug detection in some gcc versions.
#
printf "checking whether compiler is gcc... "
if fnmatch '*gcc\ version*' "$($CC -v 2>&1)" ; then
cc_is_gcc=yes
else
cc_is_gcc=no
fi
echo "$cc_is_gcc"

#
# Only build musl-gcc wrapper if toolchain does not already target musl
#
if test "$wrapper" = auto ; then
printf "checking whether to build musl-gcc wrapper... "
if test "$cc_is_gcc" = yes ; then
wrapper=yes
while read line ; do
case "$line" in */ld-musl-*) wrapper=no ;; esac
done <<EOF
$($CC -dumpspecs)
EOF
else
wrapper=no
fi
echo "$wrapper"
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
# Catch these early to simplify matching for 32-bit archs
mips64*|powerpc64*) fail "$0: unsupported target \"$target\"" ;;
arm*) ARCH=arm ;;
i?86*) ARCH=i386 ;;
x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;;
x86_64*) ARCH=x86_64 ;;
mips*) ARCH=mips ;;
microblaze*) ARCH=microblaze ;;
or1k*) ARCH=or1k ;;
powerpc*) ARCH=powerpc ;;
sh[1-9bel-]*|sh|superh*) ARCH=sh ;;
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

#
# We may use the may_alias attribute if __GNUC__ is defined, so
# if the compiler defines __GNUC__ but does not provide it,
# it must be defined away as part of the CFLAGS.
#
printf "checking whether compiler needs attribute((may_alias)) suppression... "
cat > "$tmpc" <<EOF
typedef int
#ifdef __GNUC__
__attribute__((__may_alias__))
#endif
x;
EOF
if $CC $CFLAGS_C99FSE -I./arch/$ARCH -I./include $CPPFLAGS $CFLAGS \
  -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
printf "no\n"
else
printf "yes\n"
CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
fi

#
# Check for options that may be needed to prevent the compiler from
# generating self-referential versions of memcpy,, memmove, memcmp,
# and memset. Really, we should add a check to determine if this
# option is sufficient, and if not, add a macro to cripple these
# functions with volatile...
#
tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns

#
# Enable debugging if requessted.
#
test "$debug" = yes && CFLAGS_AUTO=-g

#
# Possibly add a -O option to CFLAGS and select modules to optimize with
# -O3 based on the status of --enable-optimize and provided CFLAGS.
#
printf "checking for optimization settings... "
case "x$optimize" in
xauto)
if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
printf "using provided CFLAGS\n" ;optimize=no
else
printf "using defaults\n" ; optimize=yes
fi
;;
xsize|xnone) printf "minimize size\n" ; optimize=size ;;
xno|x) printf "disabled\n" ; optimize=no ;;
*) printf "custom\n" ;;
esac

test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
test "$optimize" = yes && optimize="internal,malloc,string"

if fnmatch 'no|size' "$optimize" ; then :
else
printf "components to be optimized for speed:"
while test "$optimize" ; do
case "$optimize" in
*,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
*) this=$optimize optimize=
esac
printf " $this"
case "$this" in
*/*.c) ;;
*/*) this=$this*.c ;;
*) this=$this/*.c ;;
esac
OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
done
OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
printf "\n"
fi

# Always try -pipe
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

#
# 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

#
# Even with -std=c99, gcc accepts some constructs which are constraint
# violations. We want to treat these as errors regardless of whether
# other purely stylistic warnings are enabled -- especially implicit
# function declarations, which are a dangerous programming error.
#
tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
tryflag CFLAGS_AUTO -Werror=implicit-int
tryflag CFLAGS_AUTO -Werror=pointer-sign
tryflag CFLAGS_AUTO -Werror=pointer-arith

if test "x$warnings" = xyes ; then
tryflag CFLAGS_AUTO -Wall
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
tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
fi

# Some patched GCC builds have these defaults messed up...
tryflag CFLAGS_AUTO -fno-stack-protector
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
}
}

# 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"

# Figure out arch variants for archs with variants
SUBARCH=
t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS_AUTO $CFLAGS"

if test "$ARCH" = "x86_64" ; then
trycppif __ILP32__ "$t" && ARCH=x32
fi

if test "$ARCH" = "arm" ; then
trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
fi

if test "$ARCH" = "mips" ; then
trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
fi

test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
&& SUBARCH=${SUBARCH}el

if test "$ARCH" = "sh" ; then
trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
# Some sh configurations are broken and replace double with float
# rather than using softfloat when the fpu is present but only
# supports single precision. Reject them.
printf "checking whether compiler's double type is IEEE double... "
echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
printf "yes\n"
else
printf "no\n"
fail "$0: error: compiler's floating point configuration is unsupported"
fi
else
SUBARCH=${SUBARCH}-nofpu
fi
fi

test "$SUBARCH" \
&& printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"

case "$ARCH$SUBARCH" in
arm) ASMSUBARCH=el ;;
*) ASMSUBARCH=$SUBARCH ;;
esac

#
# Some archs (powerpc) have different possible long double formats
# that the compiler can be configured for. The logic for whether this
# is supported is in bits/float.h; in general, it is not. We need to
# check for mismatches here or code in printf, strotd, and scanf will
# be dangerously incorrect because it depends on (1) the macros being
# correct, and (2) IEEE semantics.
#
printf "checking whether compiler's long double definition matches float.h... "
echo '#include <float.h>' > "$tmpc"
echo '#if LDBL_MANT_DIG == 53' >> "$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
printf "yes\n"
else
printf "no\n"
fail "$0: error: unsupported long double type"
fi

printf "creating config.mak... "

cmdline=$(quote "$0")
for i ; do cmdline="$cmdline $(quote "$i")" ; done

exec 3>&1 1>config.mak


cat << EOF
# This version of config.mak was generated by:
# $cmdline
# Any changes made here will be lost if configure is re-run
ARCH = $ARCH
SUBARCH = $SUBARCH
ASMSUBARCH = $ASMSUBARCH
prefix = $prefix
exec_prefix = $exec_prefix
bindir = $bindir
libdir = $libdir
includedir = $includedir
syslibdir = $syslibdir
CC = $CC
CFLAGS = $CFLAGS_AUTO $CFLAGS
CFLAGS_C99FSE = $CFLAGS_C99FSE
CFLAGS_MEMOPS = $CFLAGS_MEMOPS
CPPFLAGS = $CPPFLAGS
LDFLAGS = $LDFLAGS_AUTO $LDFLAGS
CROSS_COMPILE = $CROSS_COMPILE
LIBCC = $LIBCC
OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
EOF
test "x$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"