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