configure raw
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 --disable-warnings build with recommended warnings flags [enabled]
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 Optional packages:
39 --with-malloc=... choose malloc implementation [mallocng]
40
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='$(prefix)/include'
132 syslibdir='/lib'
133 tools=
134 tool_libs=
135 build=
136 target=
137 optimize=auto
138 debug=no
139 warnings=yes
140 shared=auto
141 static=yes
142 wrapper=auto
143 gcc_wrapper=no
144 clang_wrapper=no
145 malloc_dir=mallocng
146
147 for arg ; do
148 case "$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 ;;
175 --with-malloc=*) malloc_dir=${arg#*=} ;;
176 --enable-*|--disable-*|--with-*|--without-*|--*dir=*) ;;
177 --host=*|--target=*) target=${arg#*=} ;;
178 --build=*) build=${arg#*=} ;;
179 -* ) echo "$0: unknown option $arg" ;;
180 AR=*) AR=${arg#*=} ;;
181 RANLIB=*) RANLIB=${arg#*=} ;;
182 CC=*) CC=${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" = "$abs_builddir" && srcdir=.
207 test "$srcdir" != "." && test -f Makefile && test ! -h Makefile && fail "$0: Makefile already exists in the working directory"
208
209 #
210 # Get a temp filename we can use
211 #
212 i=0
213 set -C
214 while : ; do i=$(($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
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
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 #
282 if test "$wrapper" = auto || test "$wrapper" = detect ; then
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 ;;
338 riscv64*) ARCH=riscv64 ;;
339 sh[1-9bel-]*|sh|superh*) ARCH=sh ;;
340 s390x*) ARCH=s390x ;;
341 unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;;
342 *) fail "$0: unknown or unsupported target \"$target\"" ;;
343 esac
344
345 #
346 # Try to get a conforming C99 freestanding environment
347 #
348 tryflag CFLAGS_C99FSE -std=c99
349 tryflag CFLAGS_C99FSE -nostdinc
350 tryflag CFLAGS_C99FSE -ffreestanding \
351 || tryflag CFLAGS_C99FSE -fno-builtin
352 tryflag CFLAGS_C99FSE -fexcess-precision=standard \
353 || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; }
354 tryflag CFLAGS_C99FSE -frounding-math
355
356 #
357 # We may use the may_alias attribute if __GNUC__ is defined, so
358 # if the compiler defines __GNUC__ but does not provide it,
359 # it must be defined away as part of the CFLAGS.
360 #
361 printf "checking whether compiler needs attribute((may_alias)) suppression... "
362 cat > "$tmpc" <<EOF
363 typedef int
364 #ifdef __GNUC__
365 __attribute__((__may_alias__))
366 #endif
367 x;
368 EOF
369 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \
370 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
371 printf "no\n"
372 else
373 printf "yes\n"
374 CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
375 fi
376
377 #
378 # The GNU toolchain defaults to assuming unmarked files need an
379 # executable stack, potentially exposing vulnerabilities in programs
380 # linked with such object files. Fix this.
381 #
382 tryflag CFLAGS_C99FSE -Wa,--noexecstack
383
384 #
385 # Check for options to disable stack protector, which needs to be
386 # disabled for a few early-bootstrap translation units. If not found,
387 # this is not an error; we assume the toolchain does not do ssp.
388 #
389 tryflag CFLAGS_NOSSP -fno-stack-protector
390
391 #
392 # Check for options that may be needed to prevent the compiler from
393 # generating self-referential versions of memcpy,, memmove, memcmp,
394 # and memset. Really, we should add a check to determine if this
395 # option is sufficient, and if not, add a macro to cripple these
396 # functions with volatile...
397 #
398 tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns
399
400 #
401 # Enable debugging if requessted.
402 #
403 test "$debug" = yes && CFLAGS_AUTO=-g
404
405 #
406 # Preprocess asm files to add extra debugging information if debug is
407 # enabled, our assembler supports the needed directives, and the
408 # preprocessing script has been written for our architecture.
409 #
410 printf "checking whether we should preprocess assembly to add debugging information... "
411 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" &&
412 test -f "$srcdir/tools/add-cfi.$ARCH.awk" &&
413 printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null -
414 then
415 ADD_CFI=yes
416 else
417 ADD_CFI=no
418 fi
419 printf "%s\n" "$ADD_CFI"
420
421 #
422 # Possibly add a -O option to CFLAGS and select modules to optimize with
423 # -O3 based on the status of --enable-optimize and provided CFLAGS.
424 #
425 printf "checking for optimization settings... "
426 case "x$optimize" in
427 xauto)
428 if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then
429 printf "using provided CFLAGS\n" ;optimize=no
430 else
431 printf "using defaults\n" ; optimize=yes
432 fi
433 ;;
434 xsize|xnone) printf "minimize size\n" ; optimize=size ;;
435 xno|x) printf "disabled\n" ; optimize=no ;;
436 *) printf "custom\n" ;;
437 esac
438
439 test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
440 test "$optimize" = yes && optimize="internal,malloc,string"
441
442 if fnmatch 'no|size' "$optimize" ; then :
443 else
444 printf "components to be optimized for speed:"
445 while test "$optimize" ; do
446 case "$optimize" in
447 *,*) this=${optimize%%,*} optimize=${optimize#*,} ;;
448 *) this=$optimize optimize=
449 esac
450 printf " $this"
451 case "$this" in
452 */*.c) ;;
453 */*) this=$this*.c ;;
454 *) this=$this/*.c ;;
455 esac
456 OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this"
457 done
458 OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# }
459 printf "\n"
460 fi
461
462 # Always try -pipe
463 tryflag CFLAGS_AUTO -pipe
464
465 #
466 # If debugging is disabled, omit frame pointer. Modern GCC does this
467 # anyway on most archs even when debugging is enabled since the frame
468 # pointer is no longer needed for debugging.
469 #
470 if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then :
471 else
472 tryflag CFLAGS_AUTO -fomit-frame-pointer
473 fi
474
475 #
476 # Modern GCC wants to put DWARF tables (used for debugging and
477 # unwinding) in the loaded part of the program where they are
478 # unstrippable. These options force them back to debug sections (and
479 # cause them not to get generated at all if debugging is off).
480 #
481 tryflag CFLAGS_AUTO -fno-unwind-tables
482 tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
483
484 #
485 # Attempt to put each function and each data object in its own
486 # section. This both allows additional size optimizations at link
487 # time and works around a dangerous class of compiler/assembler bugs
488 # whereby relative address expressions are constant-folded by the
489 # assembler even when one or more of the symbols involved is
490 # replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc.
491 #
492 tryflag CFLAGS_AUTO -ffunction-sections
493 tryflag CFLAGS_AUTO -fdata-sections
494
495 #
496 # On x86, make sure we don't have incompatible instruction set
497 # extensions enabled by default. This is bad for making static binaries.
498 # We cheat and use i486 rather than i386 because i386 really does not
499 # work anyway (issues with atomic ops).
500 # Some build environments pass -march and -mtune options via CC, so
501 # check both CC and CFLAGS.
502 #
503 if test "$ARCH" = "i386" ; then
504 fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
505 fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
506 fi
507
508 #
509 # GCC defines -w as overriding any -W options, regardless of order, but
510 # clang has a bunch of annoying warnings enabled by default and needs -w
511 # to start from a clean slate. So use -w if building with clang. Also
512 # turn off a common on-by-default cast warning regardless of compiler.
513 #
514 test "$cc_family" = clang && tryflag CFLAGS_AUTO -w
515
516 tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
517
518 #
519 # Even with -std=c99, gcc accepts some constructs which are constraint
520 # violations. We want to treat these as errors regardless of whether
521 # other purely stylistic warnings are enabled -- especially implicit
522 # function declarations, which are a dangerous programming error.
523 #
524 tryflag CFLAGS_AUTO -Werror=implicit-function-declaration
525 tryflag CFLAGS_AUTO -Werror=implicit-int
526 tryflag CFLAGS_AUTO -Werror=pointer-sign
527 tryflag CFLAGS_AUTO -Werror=pointer-arith
528 tryflag CFLAGS_AUTO -Werror=int-conversion
529 tryflag CFLAGS_AUTO -Werror=incompatible-pointer-types
530 tryflag CFLAGS_AUTO -Werror=discarded-qualifiers
531 tryflag CFLAGS_AUTO -Werror=discarded-array-qualifiers
532
533 #
534 # GCC ignores unused arguements by default, but Clang needs this extra
535 # parameter to stop printing warnings about LDFLAGS passed during
536 # compiling stage and CFLAGS passed during linking stage.
537 #
538 test "$cc_family" = clang && tryflag CFLAGS_AUTO -Qunused-arguments
539
540 if test "x$warnings" = xyes ; then
541 tryflag CFLAGS_AUTO -Waddress
542 tryflag CFLAGS_AUTO -Warray-bounds
543 tryflag CFLAGS_AUTO -Wchar-subscripts
544 tryflag CFLAGS_AUTO -Wduplicate-decl-specifier
545 tryflag CFLAGS_AUTO -Winit-self
546 tryflag CFLAGS_AUTO -Wreturn-type
547 tryflag CFLAGS_AUTO -Wsequence-point
548 tryflag CFLAGS_AUTO -Wstrict-aliasing
549 tryflag CFLAGS_AUTO -Wunused-function
550 tryflag CFLAGS_AUTO -Wunused-label
551 tryflag CFLAGS_AUTO -Wunused-variable
552 fi
553
554 # Determine if the compiler produces position-independent code (PIC)
555 # by default. If so, we don't need to compile separate object files
556 # for libc.a and libc.so.
557 if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
558 pic_default=yes
559 else
560 pic_default=no
561 fi
562
563 # Reduce space lost to padding for alignment purposes by sorting data
564 # objects according to their alignment reqirements. This approximates
565 # optimal packing.
566 tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment
567 tryldflag LDFLAGS_AUTO -Wl,--sort-common
568
569 # When linking shared library, drop dummy weak definitions that were
570 # replaced by strong definitions from other translation units.
571 tryldflag LDFLAGS_AUTO -Wl,--gc-sections
572
573 # Some patched GCC builds have these defaults messed up...
574 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
575
576 # Prevent linking if there are undefined symbols; if any exist,
577 # libc.so will crash at runtime during relocation processing.
578 # The common way this can happen is failure to link the compiler
579 # runtime library; implementation error is also a possibility.
580 tryldflag LDFLAGS_AUTO -Wl,--no-undefined
581
582 # Avoid exporting symbols from compiler runtime libraries. They
583 # should be hidden anyway, but some toolchains including old gcc
584 # versions built without shared library support and pcc are broken.
585 tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL
586
587 # Public data symbols must be interposable to allow for copy
588 # relocations, but otherwise we want to bind symbols at libc link
589 # time to eliminate startup relocations and PLT overhead. Use
590 # --dynamic-list rather than -Bsymbolic-functions for greater
591 # control over what symbols are left unbound.
592 tryldflag LDFLAGS_AUTO -Wl,--dynamic-list="$srcdir/dynamic.list"
593
594 # Find compiler runtime library
595 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
596 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
597 test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \
598 && tryldflag LIBCC "$try_libcc"
599 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
600 && tryldflag LIBCC "$try_libcc"
601 printf "using compiler runtime libraries: %s\n" "$LIBCC"
602
603 # Figure out arch variants for archs with variants
604 SUBARCH=
605 t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS"
606
607 if test "$ARCH" = "i386" ; then
608 printf "checking whether compiler can use ebx in PIC asm constraints... "
609 cat > "$tmpc" <<EOF
610 int foo(int x) { __asm__ ( "" : "+b"(x) ); return x; }
611 EOF
612 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -fPIC \
613 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
614 printf "yes\n"
615 else
616 printf "no\n"
617 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_EBX_ASM"
618 fi
619 fi
620
621 if test "$ARCH" = "x86_64" ; then
622 trycppif __ILP32__ "$t" && ARCH=x32
623 fi
624
625 if test "$ARCH" = "arm" ; then
626 if trycppif __thumb2__ "$t" ; then
627 tryflag CFLAGS_AUTO -mimplicit-it=always
628 tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always
629 tryflag CFLAGS_AUTO -Wa,-mthumb
630 fi
631 trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
632 trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
633 # Versions of clang up until at least 3.8 have the wrong constraint codes
634 # for floating point operands to inline asm. Detect this so the affected
635 # source files can just disable the asm.
636 if test "$cc_family" = clang ; then
637 printf "checking whether clang's vfp asm constraints work... "
638 echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc"
639 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
640 printf "yes\n"
641 else
642 printf "no\n"
643 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_VFP_ASM"
644 CFLAGS_AUTO="${CFLAGS_AUTO# }"
645 fi
646 fi
647 fi
648
649 if test "$ARCH" = "aarch64" ; then
650 trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be
651 fi
652
653 if test "$ARCH" = "m68k" ; then
654 if trycppif "__HAVE_68881__" ; then : ;
655 elif trycppif "__mcffpu__" ; then SUBARCH="-fp64"
656 else SUBARCH="-sf"
657 fi
658 fi
659
660 if test "$ARCH" = "mips" ; then
661 trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
662 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
663 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
664 fi
665
666 if test "$ARCH" = "mips64" ; then
667 trycppif "_MIPS_SIM != _ABI64" "$t" && ARCH=mipsn32
668 trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
669 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el
670 trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
671 fi
672
673 if test "$ARCH" = "powerpc" ; then
674 trycppif "_SOFT_FLOAT || __NO_FPRS__" "$t" && SUBARCH=${SUBARCH}-sf
675 printf "checking whether compiler can use 'd' constraint in asm... "
676 echo 'double f(double x) { __asm__ ("fabs %0, %1" : "=d"(x) : "d"(x)); return x; }' > "$tmpc"
677 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
678 printf "yes\n"
679 else
680 printf "no\n"
681 CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_PPC_D_ASM"
682 CFLAGS_AUTO="${CFLAGS_AUTO# }"
683 fi
684 fi
685
686 test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
687 && SUBARCH=${SUBARCH}el
688
689 if test "$ARCH" = "powerpc64" ; then
690 trycppif "_CALL_ELF == 2" "$t" || fail "$0: error: unsupported powerpc64 ABI"
691 trycppif __LITTLE_ENDIAN__ "$t" && SUBARCH=${SUBARCH}le
692 trycppif _SOFT_FLOAT "$t" && fail "$0: error: soft-float not supported on powerpc64"
693 fi
694
695 if test "$ARCH" = "riscv64" ; then
696 trycppif __riscv_float_abi_soft "$t" && SUBARCH=${SUBARCH}-sf
697 trycppif __riscv_float_abi_single "$t" && SUBARCH=${SUBARCH}-sp
698 fi
699
700 if test "$ARCH" = "sh" ; then
701 tryflag CFLAGS_AUTO -Wa,--isa=any
702 trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb
703 if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then
704 # Some sh configurations are broken and replace double with float
705 # rather than using softfloat when the fpu is present but only
706 # supports single precision. Reject them.
707 printf "checking whether compiler's double type is IEEE double... "
708 echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc"
709 if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
710 printf "yes\n"
711 else
712 printf "no\n"
713 fail "$0: error: compiler's floating point configuration is unsupported"
714 fi
715 else
716 SUBARCH=${SUBARCH}-nofpu
717 fi
718 if trycppif __SH_FDPIC__ "$t" ; then
719 SUBARCH=${SUBARCH}-fdpic
720 fi
721 fi
722
723 test "$SUBARCH" \
724 && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH"
725
726 case "$ARCH$SUBARCH" in
727 arm) ASMSUBARCH=el ;;
728 *) ASMSUBARCH=$SUBARCH ;;
729 esac
730
731 #
732 # Some archs (powerpc) have different possible long double formats
733 # that the compiler can be configured for. The logic for whether this
734 # is supported is in bits/float.h; in general, it is not. We need to
735 # check for mismatches here or code in printf, strotd, and scanf will
736 # be dangerously incorrect because it depends on (1) the macros being
737 # correct, and (2) IEEE semantics.
738 #
739 printf "checking whether compiler's long double definition matches float.h... "
740 echo '#include <float.h>' > "$tmpc"
741 echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc"
742 echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc"
743 if $CC $CFLAGS_C99FSE \
744 -I$srcdir/arch/$ARCH -I$srcdir/arch/generic -I$srcdir/include \
745 $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
746 printf "yes\n"
747 else
748 printf "no\n"
749 fail "$0: error: unsupported long double type"
750 fi
751
752 #
753 # Some build systems globally pass in broken CFLAGS like -ffast-math
754 # for all packages. On recent GCC we can detect this and error out
755 # early rather than producing a seriously-broken math library.
756 #
757 if trycppif "__FAST_MATH__" \
758 "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then
759 fail "$0: error: compiler has broken floating point; check CFLAGS"
760 fi
761
762 printf "creating config.mak... "
763
764 cmdline=$(quote "$0")
765 for i ; do cmdline="$cmdline $(quote "$i")" ; done
766
767 exec 3>&1 1>config.mak
768
769
770 cat << EOF
771 # This version of config.mak was generated by:
772 # $cmdline
773 # Any changes made here will be lost if configure is re-run
774 AR = ${AR:-\$(CROSS_COMPILE)ar}
775 RANLIB = ${RANLIB:-\$(CROSS_COMPILE)ranlib}
776 ARCH = $ARCH
777 SUBARCH = $SUBARCH
778 ASMSUBARCH = $ASMSUBARCH
779 srcdir = $srcdir
780 prefix = $prefix
781 exec_prefix = $exec_prefix
782 bindir = $bindir
783 libdir = $libdir
784 includedir = $includedir
785 syslibdir = $syslibdir
786 CC = $CC
787 CFLAGS = $CFLAGS
788 CFLAGS_AUTO = $CFLAGS_AUTO
789 CFLAGS_C99FSE = $CFLAGS_C99FSE
790 CFLAGS_MEMOPS = $CFLAGS_MEMOPS
791 CFLAGS_NOSSP = $CFLAGS_NOSSP
792 CPPFLAGS = $CPPFLAGS
793 LDFLAGS = $LDFLAGS
794 LDFLAGS_AUTO = $LDFLAGS_AUTO
795 CROSS_COMPILE = $CROSS_COMPILE
796 LIBCC = $LIBCC
797 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
798 ALL_TOOLS = $tools
799 TOOL_LIBS = $tool_libs
800 ADD_CFI = $ADD_CFI
801 MALLOC_DIR = $malloc_dir
802 EOF
803 test "x$static" = xno && echo "STATIC_LIBS ="
804 test "x$shared" = xno && echo "SHARED_LIBS ="
805 test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)'
806 test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)'
807 test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)'
808 exec 1>&3 3>&-
809
810 test "$srcdir" = "." || ln -sf $srcdir/Makefile .
811
812 printf "done\n"
813