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320054e8 DG |
1 | #!/bin/sh |
2 | ||
3 | usage () { | |
4 | cat <<EOF | |
5 | Usage: $0 [OPTION]... [VAR=VALUE]... [TARGET] | |
6 | ||
7 | To assign environment variables (e.g., CC, CFLAGS...), specify them as | |
8 | VAR=VALUE. See below for descriptions of some of the useful variables. | |
9 | ||
10 | Defaults for the options are specified in brackets. | |
11 | ||
12 | Configuration: | |
13 | --srcdir=DIR source directory [detected] | |
14 | ||
15 | Installation directories: | |
16 | --prefix=PREFIX main installation prefix [/usr/local/musl] | |
17 | --exec-prefix=EPREFIX installation prefix for executable files [PREFIX] | |
18 | ||
19 | Fine tuning of the installation directories: | |
20 | --bindir=DIR user executables [EPREFIX/bin] | |
21 | --libdir=DIR library files for the linker [PREFIX/lib] | |
22 | --includedir=DIR include files for the C compiler [PREFIX/include] | |
23 | --syslibdir=DIR location for the dynamic linker [/lib] | |
24 | ||
25 | System types: | |
26 | --target=TARGET configure to run on target TARGET [detected] | |
27 | --host=HOST same as --target | |
28 | --build=BUILD build system type; used only to infer cross-compiling | |
29 | ||
30 | Optional features: | |
31 | --enable-optimize=... optimize listed components for speed over size [auto] | |
32 | --enable-debug build with debugging information [disabled] | |
322bd4ff | 33 | --disable-warnings build with recommended warnings flags [enabled] |
320054e8 DG |
34 | --enable-wrapper=... build given musl toolchain wrapper [auto] |
35 | --disable-shared inhibit building shared library [enabled] | |
36 | --disable-static inhibit building static library [enabled] | |
37 | ||
58795582 DG |
38 | Optional packages: |
39 | --with-malloc=... choose malloc implementation [mallocng] | |
40 | ||
320054e8 DG |
41 | Some influential environment variables: |
42 | CC C compiler command [detected] | |
43 | CFLAGS C compiler flags [-Os -pipe ...] | |
44 | CROSS_COMPILE prefix for cross compiler and tools [none] | |
45 | LIBCC compiler runtime library [detected] | |
46 | ||
47 | Use these variables to override the choices made by configure. | |
48 | ||
49 | EOF | |
50 | exit 0 | |
51 | } | |
52 | ||
53 | # Helper functions | |
54 | ||
55 | quote () { | |
56 | tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; } | |
57 | $1 | |
58 | EOF | |
59 | printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#" | |
60 | } | |
61 | echo () { printf "%s\n" "$*" ; } | |
62 | fail () { echo "$*" ; exit 1 ; } | |
63 | fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; } | |
64 | cmdexists () { type "$1" >/dev/null 2>&1 ; } | |
65 | trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; } | |
66 | ||
67 | stripdir () { | |
68 | while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done | |
69 | } | |
70 | ||
71 | trycppif () { | |
72 | printf "checking preprocessor condition %s... " "$1" | |
73 | echo "typedef int x;" > "$tmpc" | |
74 | echo "#if $1" >> "$tmpc" | |
75 | echo "#error yes" >> "$tmpc" | |
76 | echo "#endif" >> "$tmpc" | |
77 | if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then | |
78 | printf "false\n" | |
79 | return 1 | |
80 | else | |
81 | printf "true\n" | |
82 | return 0 | |
83 | fi | |
84 | } | |
85 | ||
86 | tryflag () { | |
87 | printf "checking whether compiler accepts %s... " "$2" | |
88 | echo "typedef int x;" > "$tmpc" | |
89 | if $CC $CFLAGS_TRY $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then | |
90 | printf "yes\n" | |
91 | eval "$1=\"\${$1} \$2\"" | |
92 | eval "$1=\${$1# }" | |
93 | return 0 | |
94 | else | |
95 | printf "no\n" | |
96 | return 1 | |
97 | fi | |
98 | } | |
99 | ||
100 | tryldflag () { | |
101 | printf "checking whether linker accepts %s... " "$2" | |
102 | echo "typedef int x;" > "$tmpc" | |
103 | if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then | |
104 | printf "yes\n" | |
105 | eval "$1=\"\${$1} \$2\"" | |
106 | eval "$1=\${$1# }" | |
107 | return 0 | |
108 | else | |
109 | printf "no\n" | |
110 | return 1 | |
111 | fi | |
112 | } | |
113 | ||
114 | ||
115 | ||
116 | # Beginning of actual script | |
117 | ||
118 | CFLAGS_C99FSE= | |
119 | CFLAGS_AUTO= | |
120 | CFLAGS_MEMOPS= | |
121 | CFLAGS_NOSSP= | |
122 | CFLAGS_TRY= | |
123 | LDFLAGS_AUTO= | |
124 | LDFLAGS_TRY= | |
125 | OPTIMIZE_GLOBS= | |
126 | srcdir= | |
127 | prefix=/usr/local/musl | |
128 | exec_prefix='$(prefix)' | |
129 | bindir='$(exec_prefix)/bin' | |
130 | libdir='$(prefix)/lib' | |
131 | includedir='$(prefix)/include' | |
132 | syslibdir='/lib' | |
133 | tools= | |
134 | tool_libs= | |
135 | build= | |
136 | target= | |
137 | optimize=auto | |
138 | debug=no | |
322bd4ff | 139 | warnings=yes |
320054e8 DG |
140 | shared=auto |
141 | static=yes | |
142 | wrapper=auto | |
143 | gcc_wrapper=no | |
144 | clang_wrapper=no | |
58795582 | 145 | malloc_dir=mallocng |
320054e8 DG |
146 | |
147 | for arg ; do | |
148 | case "$arg" in | |
149 | --help|-h) usage ;; | |
150 | --srcdir=*) srcdir=${arg#*=} ;; | |
151 | --prefix=*) prefix=${arg#*=} ;; | |
152 | --exec-prefix=*) exec_prefix=${arg#*=} ;; | |
153 | --bindir=*) bindir=${arg#*=} ;; | |
154 | --libdir=*) libdir=${arg#*=} ;; | |
155 | --includedir=*) includedir=${arg#*=} ;; | |
156 | --syslibdir=*) syslibdir=${arg#*=} ;; | |
157 | --enable-shared|--enable-shared=yes) shared=yes ;; | |
158 | --disable-shared|--enable-shared=no) shared=no ;; | |
159 | --enable-static|--enable-static=yes) static=yes ;; | |
160 | --disable-static|--enable-static=no) static=no ;; | |
161 | --enable-optimize) optimize=yes ;; | |
162 | --enable-optimize=*) optimize=${arg#*=} ;; | |
163 | --disable-optimize) optimize=no ;; | |
164 | --enable-debug|--enable-debug=yes) debug=yes ;; | |
165 | --disable-debug|--enable-debug=no) debug=no ;; | |
166 | --enable-warnings|--enable-warnings=yes) warnings=yes ;; | |
167 | --disable-warnings|--enable-warnings=no) warnings=no ;; | |
168 | --enable-wrapper|--enable-wrapper=yes) wrapper=detect ;; | |
169 | --enable-wrapper=all) wrapper=yes ; gcc_wrapper=yes ; clang_wrapper=yes ;; | |
170 | --enable-wrapper=gcc) wrapper=yes ; gcc_wrapper=yes ;; | |
171 | --enable-wrapper=clang) wrapper=yes ; clang_wrapper=yes ;; | |
172 | --disable-wrapper|--enable-wrapper=no) wrapper=no ;; | |
173 | --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;; | |
174 | --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;; | |
58795582 | 175 | --with-malloc=*) malloc_dir=${arg#*=} ;; |
320054e8 DG |
176 | --enable-*|--disable-*|--with-*|--without-*|--*dir=*) ;; |
177 | --host=*|--target=*) target=${arg#*=} ;; | |
178 | --build=*) build=${arg#*=} ;; | |
179 | -* ) echo "$0: unknown option $arg" ;; | |
d4db3fa2 DG |
180 | AR=*) AR=${arg#*=} ;; |
181 | RANLIB=*) RANLIB=${arg#*=} ;; | |
320054e8 DG |
182 | CC=*) CC=${arg#*=} ;; |
183 | CFLAGS=*) CFLAGS=${arg#*=} ;; | |
184 | CPPFLAGS=*) CPPFLAGS=${arg#*=} ;; | |
185 | LDFLAGS=*) LDFLAGS=${arg#*=} ;; | |
186 | CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;; | |
187 | LIBCC=*) LIBCC=${arg#*=} ;; | |
188 | *=*) ;; | |
189 | *) build=$arg ; target=$arg ;; | |
190 | esac | |
191 | done | |
192 | ||
193 | for i in srcdir prefix exec_prefix bindir libdir includedir syslibdir ; do | |
194 | stripdir $i | |
195 | done | |
196 | ||
197 | # | |
198 | # Get the source dir for out-of-tree builds | |
199 | # | |
200 | if test -z "$srcdir" ; then | |
201 | srcdir="${0%/configure}" | |
202 | stripdir srcdir | |
203 | fi | |
204 | abs_builddir="$(pwd)" || fail "$0: cannot determine working directory" | |
205 | abs_srcdir="$(cd $srcdir && pwd)" || fail "$0: invalid source directory $srcdir" | |
206 | test "$abs_srcdir" = "$abs_builddir" && srcdir=. | |
322bd4ff | 207 | test "$srcdir" != "." && test -f Makefile && test ! -h Makefile && fail "$0: Makefile already exists in the working directory" |
320054e8 DG |
208 | |
209 | # | |
210 | # Get a temp filename we can use | |
211 | # | |
212 | i=0 | |
213 | set -C | |
214 | while : ; do i=$(($i+1)) | |
215 | tmpc="./conf$$-$PPID-$i.c" | |
216 | 2>|/dev/null > "$tmpc" && break | |
217 | test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc" | |
218 | done | |
219 | set +C | |
220 | trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP | |
221 | ||
58795582 DG |
222 | # |
223 | # Check that the requested malloc implementation exists | |
224 | # | |
225 | test -d "$srcdir/src/malloc/$malloc_dir" \ | |
226 | || fail "$0: error: chosen malloc implementation '$malloc_dir' does not exist" | |
227 | ||
320054e8 DG |
228 | # |
229 | # Check whether we are cross-compiling, and set a default | |
230 | # CROSS_COMPILE prefix if none was provided. | |
231 | # | |
232 | test "$target" && \ | |
233 | test "$target" != "$build" && \ | |
234 | test -z "$CROSS_COMPILE" && \ | |
235 | CROSS_COMPILE="$target-" | |
236 | ||
237 | # | |
238 | # Find a C compiler to use | |
239 | # | |
240 | printf "checking for C compiler... " | |
241 | trycc ${CROSS_COMPILE}gcc | |
242 | trycc ${CROSS_COMPILE}c99 | |
243 | trycc ${CROSS_COMPILE}cc | |
244 | printf "%s\n" "$CC" | |
245 | test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; } | |
246 | ||
247 | printf "checking whether C compiler works... " | |
248 | echo "typedef int x;" > "$tmpc" | |
249 | if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then | |
250 | printf "yes\n" | |
251 | else | |
252 | printf "no; compiler output follows:\n%s\n" "$output" | |
253 | exit 1 | |
254 | fi | |
255 | ||
256 | # | |
257 | # Figure out options to force errors on unknown flags. | |
258 | # | |
259 | tryflag CFLAGS_TRY -Werror=unknown-warning-option | |
260 | tryflag CFLAGS_TRY -Werror=unused-command-line-argument | |
261 | tryflag CFLAGS_TRY -Werror=ignored-optimization-argument | |
262 | tryldflag LDFLAGS_TRY -Werror=unknown-warning-option | |
263 | tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument | |
264 | ||
265 | # | |
266 | # Need to know if the compiler is gcc or clang to decide which toolchain | |
267 | # wrappers to build. | |
268 | # | |
269 | printf "checking for C compiler family... " | |
270 | cc_ver="$(LC_ALL=C $CC -v 2>&1)" | |
271 | cc_family=unknown | |
272 | if fnmatch '*gcc\ version*' "$cc_ver" ; then | |
273 | cc_family=gcc | |
274 | elif fnmatch '*clang\ version*' "$cc_ver" ; then | |
275 | cc_family=clang | |
276 | fi | |
277 | echo "$cc_family" | |
278 | ||
279 | # | |
280 | # Figure out toolchain wrapper to build | |
281 | # | |
322bd4ff | 282 | if test "$wrapper" = auto || test "$wrapper" = detect ; then |
320054e8 DG |
283 | echo "#include <stdlib.h>" > "$tmpc" |
284 | echo "#if ! __GLIBC__" >> "$tmpc" | |
285 | echo "#error no" >> "$tmpc" | |
286 | echo "#endif" >> "$tmpc" | |
287 | printf "checking for toolchain wrapper to build... " | |
288 | if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then | |
289 | echo "none" | |
290 | elif test "$cc_family" = gcc ; then | |
291 | gcc_wrapper=yes | |
292 | echo "gcc" | |
293 | elif test "$cc_family" = clang ; then | |
294 | clang_wrapper=yes | |
295 | echo "clang" | |
296 | else | |
297 | echo "none" | |
298 | if test "$wrapper" = detect ; then | |
299 | fail "$0: could not find an appropriate toolchain wrapper" | |
300 | fi | |
301 | fi | |
302 | fi | |
303 | ||
304 | if test "$gcc_wrapper" = yes ; then | |
305 | tools="$tools obj/musl-gcc" | |
306 | tool_libs="$tool_libs lib/musl-gcc.specs" | |
307 | fi | |
308 | if test "$clang_wrapper" = yes ; then | |
309 | tools="$tools obj/musl-clang obj/ld.musl-clang" | |
310 | fi | |
311 | ||
312 | # | |
313 | # Find the target architecture | |
314 | # | |
315 | printf "checking target system type... " | |
316 | test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown | |
317 | printf "%s\n" "$target" | |
318 | ||
319 | # | |
320 | # Convert to just ARCH | |
321 | # | |
322 | case "$target" in | |
323 | # Catch these early to simplify matching for 32-bit archs | |
324 | arm*) ARCH=arm ;; | |
325 | aarch64*) ARCH=aarch64 ;; | |
326 | i?86-nt32*) ARCH=nt32 ;; | |
327 | i?86*) ARCH=i386 ;; | |
328 | x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;; | |
329 | x86_64-nt64*) ARCH=nt64 ;; | |
330 | x86_64*) ARCH=x86_64 ;; | |
331 | m68k*) ARCH=m68k ;; | |
332 | mips64*|mipsisa64*) ARCH=mips64 ;; | |
333 | mips*) ARCH=mips ;; | |
334 | microblaze*) ARCH=microblaze ;; | |
335 | or1k*) ARCH=or1k ;; | |
336 | powerpc64*|ppc64*) ARCH=powerpc64 ;; | |
337 | powerpc*|ppc*) ARCH=powerpc ;; | |
d4db3fa2 | 338 | riscv64*) ARCH=riscv64 ;; |
320054e8 DG |
339 | sh[1-9bel-]*|sh|superh*) ARCH=sh ;; |
340 | s390x*) ARCH=s390x ;; | |
341 | wasm32) ARCH=wasm32 ;; | |
342 | wasm64) ARCH=wasm64 ;; | |
343 | unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;; | |
344 | *) fail "$0: unknown or unsupported target \"$target\"" ;; | |
345 | esac | |
346 | ||
347 | # | |
348 | # Try to get a conforming C99 freestanding environment | |
349 | # | |
350 | tryflag CFLAGS_C99FSE -std=c99 | |
351 | tryflag CFLAGS_C99FSE -nostdinc | |
352 | tryflag CFLAGS_C99FSE -ffreestanding \ | |
353 | || tryflag CFLAGS_C99FSE -fno-builtin | |
354 | tryflag CFLAGS_C99FSE -fexcess-precision=standard \ | |
355 | || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; } | |
356 | tryflag CFLAGS_C99FSE -frounding-math | |
357 | ||
358 | # | |
359 | # We may use the may_alias attribute if __GNUC__ is defined, so | |
360 | # if the compiler defines __GNUC__ but does not provide it, | |
361 | # it must be defined away as part of the CFLAGS. | |
362 | # | |
363 | printf "checking whether compiler needs attribute((may_alias)) suppression... " | |
364 | cat > "$tmpc" <<EOF | |
365 | typedef int | |
366 | #ifdef __GNUC__ | |
367 | __attribute__((__may_alias__)) | |
368 | #endif | |
369 | x; | |
370 | EOF | |
371 | if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \ | |
372 | -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then | |
373 | printf "no\n" | |
374 | else | |
375 | printf "yes\n" | |
376 | CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__=" | |
377 | fi | |
378 | ||
379 | # | |
380 | # The GNU toolchain defaults to assuming unmarked files need an | |
381 | # executable stack, potentially exposing vulnerabilities in programs | |
382 | # linked with such object files. Fix this. | |
383 | # | |
384 | tryflag CFLAGS_C99FSE -Wa,--noexecstack | |
385 | ||
386 | # | |
387 | # Check for options to disable stack protector, which needs to be | |
388 | # disabled for a few early-bootstrap translation units. If not found, | |
389 | # this is not an error; we assume the toolchain does not do ssp. | |
390 | # | |
391 | tryflag CFLAGS_NOSSP -fno-stack-protector | |
392 | ||
393 | # | |
394 | # Check for options that may be needed to prevent the compiler from | |
395 | # generating self-referential versions of memcpy,, memmove, memcmp, | |
396 | # and memset. Really, we should add a check to determine if this | |
397 | # option is sufficient, and if not, add a macro to cripple these | |
398 | # functions with volatile... | |
399 | # | |
400 | tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns | |
401 | ||
402 | # | |
403 | # Enable debugging if requessted. | |
404 | # | |
405 | test "$debug" = yes && CFLAGS_AUTO=-g | |
406 | ||
407 | # | |
408 | # Preprocess asm files to add extra debugging information if debug is | |
409 | # enabled, our assembler supports the needed directives, and the | |
410 | # preprocessing script has been written for our architecture. | |
411 | # | |
412 | printf "checking whether we should preprocess assembly to add debugging information... " | |
413 | if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" && | |
5d8a1409 | 414 | test -f "$srcdir/tools/add-cfi.$ARCH.awk" && |
320054e8 DG |
415 | printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null - |
416 | then | |
417 | ADD_CFI=yes | |
418 | else | |
419 | ADD_CFI=no | |
420 | fi | |
421 | printf "%s\n" "$ADD_CFI" | |
422 | ||
423 | # | |
424 | # Possibly add a -O option to CFLAGS and select modules to optimize with | |
425 | # -O3 based on the status of --enable-optimize and provided CFLAGS. | |
426 | # | |
427 | printf "checking for optimization settings... " | |
428 | case "x$optimize" in | |
429 | xauto) | |
430 | if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then | |
431 | printf "using provided CFLAGS\n" ;optimize=no | |
432 | else | |
433 | printf "using defaults\n" ; optimize=yes | |
434 | fi | |
435 | ;; | |
436 | xsize|xnone) printf "minimize size\n" ; optimize=size ;; | |
437 | xno|x) printf "disabled\n" ; optimize=no ;; | |
438 | *) printf "custom\n" ;; | |
439 | esac | |
440 | ||
441 | test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2 | |
442 | test "$optimize" = yes && optimize="internal,malloc,string" | |
443 | ||
444 | if fnmatch 'no|size' "$optimize" ; then : | |
445 | else | |
446 | printf "components to be optimized for speed:" | |
447 | while test "$optimize" ; do | |
448 | case "$optimize" in | |
449 | *,*) this=${optimize%%,*} optimize=${optimize#*,} ;; | |
450 | *) this=$optimize optimize= | |
451 | esac | |
452 | printf " $this" | |
453 | case "$this" in | |
454 | */*.c) ;; | |
455 | */*) this=$this*.c ;; | |
456 | *) this=$this/*.c ;; | |
457 | esac | |
458 | OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this" | |
459 | done | |
460 | OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# } | |
461 | printf "\n" | |
462 | fi | |
463 | ||
464 | # Always try -pipe | |
465 | tryflag CFLAGS_AUTO -pipe | |
466 | ||
467 | # | |
468 | # If debugging is disabled, omit frame pointer. Modern GCC does this | |
469 | # anyway on most archs even when debugging is enabled since the frame | |
470 | # pointer is no longer needed for debugging. | |
471 | # | |
472 | if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then : | |
322bd4ff | 473 | else |
320054e8 DG |
474 | tryflag CFLAGS_AUTO -fomit-frame-pointer |
475 | fi | |
476 | ||
477 | # | |
478 | # Modern GCC wants to put DWARF tables (used for debugging and | |
479 | # unwinding) in the loaded part of the program where they are | |
480 | # unstrippable. These options force them back to debug sections (and | |
481 | # cause them not to get generated at all if debugging is off). | |
482 | # | |
483 | tryflag CFLAGS_AUTO -fno-unwind-tables | |
484 | tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables | |
485 | ||
486 | # | |
487 | # Attempt to put each function and each data object in its own | |
488 | # section. This both allows additional size optimizations at link | |
489 | # time and works around a dangerous class of compiler/assembler bugs | |
490 | # whereby relative address expressions are constant-folded by the | |
491 | # assembler even when one or more of the symbols involved is | |
492 | # replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc. | |
493 | # | |
494 | tryflag CFLAGS_AUTO -ffunction-sections | |
495 | tryflag CFLAGS_AUTO -fdata-sections | |
496 | ||
497 | # | |
498 | # On x86, make sure we don't have incompatible instruction set | |
499 | # extensions enabled by default. This is bad for making static binaries. | |
500 | # We cheat and use i486 rather than i386 because i386 really does not | |
501 | # work anyway (issues with atomic ops). | |
502 | # Some build environments pass -march and -mtune options via CC, so | |
503 | # check both CC and CFLAGS. | |
504 | # | |
505 | if test "$ARCH" = "i386" ; then | |
506 | fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486 | |
507 | fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic | |
508 | fi | |
509 | ||
58795582 DG |
510 | # |
511 | # GCC defines -w as overriding any -W options, regardless of order, but | |
512 | # clang has a bunch of annoying warnings enabled by default and needs -w | |
322bd4ff DG |
513 | # to start from a clean slate. So use -w if building with clang. Also |
514 | # turn off a common on-by-default cast warning regardless of compiler. | |
58795582 DG |
515 | # |
516 | test "$cc_family" = clang && tryflag CFLAGS_AUTO -w | |
517 | ||
322bd4ff DG |
518 | tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast |
519 | ||
320054e8 DG |
520 | # |
521 | # Even with -std=c99, gcc accepts some constructs which are constraint | |
522 | # violations. We want to treat these as errors regardless of whether | |
523 | # other purely stylistic warnings are enabled -- especially implicit | |
524 | # function declarations, which are a dangerous programming error. | |
525 | # | |
526 | tryflag CFLAGS_AUTO -Werror=implicit-function-declaration | |
527 | tryflag CFLAGS_AUTO -Werror=implicit-int | |
528 | tryflag CFLAGS_AUTO -Werror=pointer-sign | |
529 | tryflag CFLAGS_AUTO -Werror=pointer-arith | |
322bd4ff DG |
530 | tryflag CFLAGS_AUTO -Werror=int-conversion |
531 | tryflag CFLAGS_AUTO -Werror=incompatible-pointer-types | |
532 | tryflag CFLAGS_AUTO -Werror=discarded-qualifiers | |
533 | tryflag CFLAGS_AUTO -Werror=discarded-array-qualifiers | |
320054e8 DG |
534 | |
535 | # | |
536 | # GCC ignores unused arguements by default, but Clang needs this extra | |
537 | # parameter to stop printing warnings about LDFLAGS passed during | |
538 | # compiling stage and CFLAGS passed during linking stage. | |
539 | # | |
540 | test "$cc_family" = clang && tryflag CFLAGS_AUTO -Qunused-arguments | |
541 | ||
542 | if test "x$warnings" = xyes ; then | |
322bd4ff DG |
543 | tryflag CFLAGS_AUTO -Waddress |
544 | tryflag CFLAGS_AUTO -Warray-bounds | |
545 | tryflag CFLAGS_AUTO -Wchar-subscripts | |
546 | tryflag CFLAGS_AUTO -Wduplicate-decl-specifier | |
547 | tryflag CFLAGS_AUTO -Winit-self | |
548 | tryflag CFLAGS_AUTO -Wreturn-type | |
549 | tryflag CFLAGS_AUTO -Wsequence-point | |
550 | tryflag CFLAGS_AUTO -Wstrict-aliasing | |
551 | tryflag CFLAGS_AUTO -Wunused-function | |
552 | tryflag CFLAGS_AUTO -Wunused-label | |
553 | tryflag CFLAGS_AUTO -Wunused-variable | |
320054e8 DG |
554 | fi |
555 | ||
556 | # Determine if the compiler produces position-independent code (PIC) | |
557 | # by default. If so, we don't need to compile separate object files | |
558 | # for libc.a and libc.so. | |
559 | if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then | |
560 | pic_default=yes | |
561 | else | |
562 | pic_default=no | |
563 | fi | |
564 | ||
565 | # Reduce space lost to padding for alignment purposes by sorting data | |
566 | # objects according to their alignment reqirements. This approximates | |
567 | # optimal packing. | |
568 | tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment | |
569 | tryldflag LDFLAGS_AUTO -Wl,--sort-common | |
570 | ||
571 | # When linking shared library, drop dummy weak definitions that were | |
572 | # replaced by strong definitions from other translation units. | |
573 | tryldflag LDFLAGS_AUTO -Wl,--gc-sections | |
574 | ||
575 | # Some patched GCC builds have these defaults messed up... | |
576 | tryldflag LDFLAGS_AUTO -Wl,--hash-style=both | |
577 | ||
578 | # Prevent linking if there are undefined symbols; if any exist, | |
579 | # libc.so will crash at runtime during relocation processing. | |
580 | # The common way this can happen is failure to link the compiler | |
581 | # runtime library; implementation error is also a possibility. | |
582 | tryldflag LDFLAGS_AUTO -Wl,--no-undefined | |
583 | ||
584 | # Avoid exporting symbols from compiler runtime libraries. They | |
585 | # should be hidden anyway, but some toolchains including old gcc | |
586 | # versions built without shared library support and pcc are broken. | |
587 | tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL | |
588 | ||
589 | # Public data symbols must be interposable to allow for copy | |
590 | # relocations, but otherwise we want to bind symbols at libc link | |
591 | # time to eliminate startup relocations and PLT overhead. Use | |
592 | # --dynamic-list rather than -Bsymbolic-functions for greater | |
593 | # control over what symbols are left unbound. | |
594 | tryldflag LDFLAGS_AUTO -Wl,--dynamic-list="$srcdir/dynamic.list" | |
595 | ||
596 | # Find compiler runtime library | |
597 | test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh | |
598 | test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt | |
599 | test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \ | |
600 | && tryldflag LIBCC "$try_libcc" | |
601 | test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \ | |
602 | && tryldflag LIBCC "$try_libcc" | |
603 | printf "using compiler runtime libraries: %s\n" "$LIBCC" | |
604 | ||
605 | # Figure out arch variants for archs with variants | |
606 | SUBARCH= | |
607 | t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" | |
608 | ||
d4db3fa2 DG |
609 | if test "$ARCH" = "i386" ; then |
610 | printf "checking whether compiler can use ebx in PIC asm constraints... " | |
611 | cat > "$tmpc" <<EOF | |
612 | int foo(int x) { __asm__ ( "" : "+b"(x) ); return x; } | |
613 | EOF | |
614 | if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -fPIC \ | |
615 | -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then | |
616 | printf "yes\n" | |
617 | else | |
618 | printf "no\n" | |
619 | CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_EBX_ASM" | |
620 | fi | |
621 | fi | |
622 | ||
320054e8 DG |
623 | if test "$ARCH" = "x86_64" ; then |
624 | trycppif __ILP32__ "$t" && ARCH=x32 | |
625 | fi | |
626 | ||
627 | if test "$ARCH" = "arm" ; then | |
628 | if trycppif __thumb2__ "$t" ; then | |
629 | tryflag CFLAGS_AUTO -mimplicit-it=always | |
630 | tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always | |
631 | tryflag CFLAGS_AUTO -Wa,-mthumb | |
632 | fi | |
633 | trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb | |
634 | trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf | |
635 | # Versions of clang up until at least 3.8 have the wrong constraint codes | |
636 | # for floating point operands to inline asm. Detect this so the affected | |
637 | # source files can just disable the asm. | |
638 | if test "$cc_family" = clang ; then | |
639 | printf "checking whether clang's vfp asm constraints work... " | |
640 | echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc" | |
641 | if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then | |
642 | printf "yes\n" | |
643 | else | |
644 | printf "no\n" | |
645 | CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_VFP_ASM" | |
646 | CFLAGS_AUTO="${CFLAGS_AUTO# }" | |
647 | fi | |
648 | fi | |
649 | fi | |
650 | ||
651 | if test "$ARCH" = "aarch64" ; then | |
652 | trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be | |
653 | fi | |
654 | ||
655 | if test "$ARCH" = "m68k" ; then | |
656 | if trycppif "__HAVE_68881__" ; then : ; | |
657 | elif trycppif "__mcffpu__" ; then SUBARCH="-fp64" | |
658 | else SUBARCH="-sf" | |
659 | fi | |
660 | fi | |
661 | ||
662 | if test "$ARCH" = "mips" ; then | |
663 | trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6 | |
664 | trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el | |
665 | trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf | |
666 | fi | |
667 | ||
668 | if test "$ARCH" = "mips64" ; then | |
669 | trycppif "_MIPS_SIM != _ABI64" "$t" && ARCH=mipsn32 | |
670 | trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6 | |
671 | trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el | |
672 | trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf | |
673 | fi | |
674 | ||
675 | if test "$ARCH" = "powerpc" ; then | |
5d8a1409 | 676 | trycppif "_SOFT_FLOAT || __NO_FPRS__" "$t" && SUBARCH=${SUBARCH}-sf |
575e1579 DG |
677 | printf "checking whether compiler can use 'd' constraint in asm... " |
678 | echo 'double f(double x) { __asm__ ("fabs %0, %1" : "=d"(x) : "d"(x)); return x; }' > "$tmpc" | |
679 | if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then | |
680 | printf "yes\n" | |
681 | else | |
682 | printf "no\n" | |
683 | CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_PPC_D_ASM" | |
684 | CFLAGS_AUTO="${CFLAGS_AUTO# }" | |
685 | fi | |
320054e8 DG |
686 | fi |
687 | ||
688 | test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \ | |
689 | && SUBARCH=${SUBARCH}el | |
690 | ||
691 | if test "$ARCH" = "powerpc64" ; then | |
692 | trycppif "_CALL_ELF == 2" "$t" || fail "$0: error: unsupported powerpc64 ABI" | |
693 | trycppif __LITTLE_ENDIAN__ "$t" && SUBARCH=${SUBARCH}le | |
694 | trycppif _SOFT_FLOAT "$t" && fail "$0: error: soft-float not supported on powerpc64" | |
695 | fi | |
696 | ||
d4db3fa2 DG |
697 | if test "$ARCH" = "riscv64" ; then |
698 | trycppif __riscv_float_abi_soft "$t" && SUBARCH=${SUBARCH}-sf | |
699 | trycppif __riscv_float_abi_single "$t" && SUBARCH=${SUBARCH}-sp | |
700 | fi | |
701 | ||
320054e8 DG |
702 | if test "$ARCH" = "sh" ; then |
703 | tryflag CFLAGS_AUTO -Wa,--isa=any | |
704 | trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb | |
705 | if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then | |
706 | # Some sh configurations are broken and replace double with float | |
707 | # rather than using softfloat when the fpu is present but only | |
708 | # supports single precision. Reject them. | |
709 | printf "checking whether compiler's double type is IEEE double... " | |
710 | echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc" | |
711 | if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then | |
712 | printf "yes\n" | |
713 | else | |
714 | printf "no\n" | |
715 | fail "$0: error: compiler's floating point configuration is unsupported" | |
716 | fi | |
717 | else | |
718 | SUBARCH=${SUBARCH}-nofpu | |
719 | fi | |
720 | if trycppif __SH_FDPIC__ "$t" ; then | |
721 | SUBARCH=${SUBARCH}-fdpic | |
722 | fi | |
723 | fi | |
724 | ||
725 | test "$SUBARCH" \ | |
726 | && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH" | |
727 | ||
728 | case "$ARCH$SUBARCH" in | |
729 | arm) ASMSUBARCH=el ;; | |
730 | *) ASMSUBARCH=$SUBARCH ;; | |
731 | esac | |
732 | ||
733 | # | |
734 | # Some archs (powerpc) have different possible long double formats | |
735 | # that the compiler can be configured for. The logic for whether this | |
736 | # is supported is in bits/float.h; in general, it is not. We need to | |
737 | # check for mismatches here or code in printf, strotd, and scanf will | |
738 | # be dangerously incorrect because it depends on (1) the macros being | |
739 | # correct, and (2) IEEE semantics. | |
740 | # | |
741 | printf "checking whether compiler's long double definition matches float.h... " | |
742 | echo '#include <float.h>' > "$tmpc" | |
743 | echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc" | |
744 | echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc" | |
745 | if $CC $CFLAGS_C99FSE \ | |
746 | -I$srcdir/arch/$ARCH -I$srcdir/arch/generic -I$srcdir/include \ | |
747 | $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then | |
748 | printf "yes\n" | |
749 | else | |
750 | printf "no\n" | |
751 | fail "$0: error: unsupported long double type" | |
752 | fi | |
753 | ||
754 | # | |
755 | # Some build systems globally pass in broken CFLAGS like -ffast-math | |
756 | # for all packages. On recent GCC we can detect this and error out | |
757 | # early rather than producing a seriously-broken math library. | |
758 | # | |
759 | if trycppif "__FAST_MATH__" \ | |
760 | "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then | |
761 | fail "$0: error: compiler has broken floating point; check CFLAGS" | |
762 | fi | |
763 | ||
764 | printf "creating config.mak... " | |
765 | ||
766 | cmdline=$(quote "$0") | |
767 | for i ; do cmdline="$cmdline $(quote "$i")" ; done | |
768 | ||
769 | exec 3>&1 1>config.mak | |
770 | ||
771 | ||
772 | cat << EOF | |
773 | # This version of config.mak was generated by: | |
774 | # $cmdline | |
775 | # Any changes made here will be lost if configure is re-run | |
d4db3fa2 DG |
776 | AR = ${AR:-\$(CROSS_COMPILE)ar} |
777 | RANLIB = ${RANLIB:-\$(CROSS_COMPILE)ranlib} | |
320054e8 DG |
778 | ARCH = $ARCH |
779 | SUBARCH = $SUBARCH | |
780 | ASMSUBARCH = $ASMSUBARCH | |
781 | srcdir = $srcdir | |
782 | prefix = $prefix | |
783 | exec_prefix = $exec_prefix | |
784 | bindir = $bindir | |
785 | libdir = $libdir | |
786 | includedir = $includedir | |
787 | syslibdir = $syslibdir | |
788 | CC = $CC | |
789 | CFLAGS = $CFLAGS | |
790 | CFLAGS_AUTO = $CFLAGS_AUTO | |
791 | CFLAGS_C99FSE = $CFLAGS_C99FSE | |
792 | CFLAGS_MEMOPS = $CFLAGS_MEMOPS | |
793 | CFLAGS_NOSSP = $CFLAGS_NOSSP | |
794 | CPPFLAGS = $CPPFLAGS | |
795 | LDFLAGS = $LDFLAGS | |
796 | LDFLAGS_AUTO = $LDFLAGS_AUTO | |
797 | CROSS_COMPILE = $CROSS_COMPILE | |
798 | LIBCC = $LIBCC | |
799 | OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS | |
800 | ALL_TOOLS = $tools | |
801 | TOOL_LIBS = $tool_libs | |
802 | ADD_CFI = $ADD_CFI | |
58795582 | 803 | MALLOC_DIR = $malloc_dir |
320054e8 DG |
804 | EOF |
805 | test "x$static" = xno && echo "STATIC_LIBS =" | |
806 | test "x$shared" = xno && echo "SHARED_LIBS =" | |
807 | test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)' | |
808 | test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)' | |
809 | test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)' | |
810 | exec 1>&3 3>&- | |
811 | ||
812 | test "$srcdir" = "." || ln -sf $srcdir/Makefile . | |
813 | ||
814 | printf "done\n" |