1 # Process this file with autoconf to produce a configure script, like so:
2 # aclocal -I ../config && autoconf && autoheader && automake
5 AC_INIT([GNU OpenMP Runtime Library], 1.0,,[libgomp])
6 AC_CONFIG_HEADER(config.h)
12 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
13 LIBGOMP_ENABLE(version-specific-runtime-libs, no, ,
14 [Specify that runtime libraries should be installed in a compiler-specific directory],
16 AC_MSG_RESULT($enable_version_specific_runtime_libs)
18 AC_MSG_CHECKING([for --enable-linux-futex])
19 LIBGOMP_ENABLE(linux-futex, default, ,
20 [Use the Linux futex system call],
21 permit yes|no|default)
22 AC_MSG_RESULT($enable_linux_futex)
27 # Gets build, host, target, *_vendor, *_cpu, *_os, etc.
29 # You will slowly go insane if you do not grok the following fact: when
30 # building this library, the top-level /target/ becomes the library's /host/.
32 # configure then causes --target to default to --host, exactly like any
33 # other package using autoconf. Therefore, 'target' and 'host' will
34 # always be the same. This makes sense both for native and cross compilers
35 # just think about it for a little while. :-)
37 # Also, if this library is being configured as part of a cross compiler, the
38 # top-level configure script will pass the "real" host as $with_cross_host.
40 # Do not delete or change the following two lines. For why, see
41 # http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
43 target_alias=${target_alias-$host_alias}
45 # Sets up automake. Must come after AC_CANONICAL_SYSTEM. Each of the
46 # following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
47 # 1.9.0: minimum required version
48 # no-define: PACKAGE and VERSION will not be #define'd in config.h (a bunch
49 # of other PACKAGE_* variables will, however, and there's nothing
50 # we can do about that; they come from AC_INIT).
51 # foreign: we don't follow the normal rules for GNU packages (no COPYING
52 # file in the top srcdir, etc, etc), so stop complaining.
53 # no-dependencies: turns off auto dependency generation (just for now)
54 # -Wall: turns on all automake warnings...
55 # -Wno-portability: ...except this one, since GNU make is required.
56 # -Wno-override: ... and this one, since we do want this in testsuite.
57 AM_INIT_AUTOMAKE([1.9.0 foreign -Wall -Wno-portability -Wno-override])
58 AM_ENABLE_MULTILIB(, ..)
60 # Calculate toolexeclibdir
61 # Also toolexecdir, though it's only used in toolexeclibdir
62 case ${enable_version_specific_runtime_libs} in
64 # Need the gcc compiler version to know where to install libraries
65 # and header files if --enable-version-specific-runtime-libs option
67 toolexecdir='$(libdir)/gcc/$(target_alias)'
68 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
71 if test -n "$with_cross_host" &&
72 test x"$with_cross_host" != x"no"; then
73 # Install a library built with a cross compiler in tooldir, not libdir.
74 toolexecdir='$(exec_prefix)/$(target_alias)'
75 toolexeclibdir='$(toolexecdir)/lib'
77 toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
78 toolexeclibdir='$(libdir)'
80 multi_os_directory=`$CC -print-multi-os-directory`
81 case $multi_os_directory in
82 .) ;; # Avoid trailing /.
83 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
88 AC_SUBST(toolexeclibdir)
91 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
92 # We must force CC to /not/ be precious variables; otherwise
93 # the wrong, non-multilib-adjusted value will be used in multilibs.
94 # As a side effect, we have to subst CFLAGS ourselves.
96 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
97 m4_define([_AC_ARG_VAR_PRECIOUS],[])
99 m4_rename([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
103 # In order to override CFLAGS_FOR_TARGET, all of our special flags go
104 # in XCFLAGS. But we need them in CFLAGS during configury. So put them
105 # in both places for now and restore CFLAGS at the end of config.
106 save_CFLAGS="$CFLAGS"
108 # Add -Wall -Werror if we are using GCC.
109 if test "x$GCC" = "xyes"; then
110 XCFLAGS="$XCFLAGS -Wall -Werror"
113 # Find other programs we need.
114 AC_CHECK_TOOL(AR, ar)
115 AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
116 AC_PATH_PROG(PERL, perl, perl-not-found-in-path-error)
122 AC_SUBST(enable_shared)
123 AC_SUBST(enable_static)
127 # We need gfortran to compile parts of the library
128 # We can't use AC_PROG_FC because it expects a fully working gfortran.
129 #AC_PROG_FC(gfortran)
132 FCFLAGS="$FCFLAGS -Wall"
134 # For libtool versioning info, format is CURRENT:REVISION:AGE
135 libtool_VERSION=1:0:0
136 AC_SUBST(libtool_VERSION)
138 # Check header files.
141 AC_CHECK_HEADERS(unistd.h semaphore.h sys/loadavg.h sys/time.h)
143 GCC_HEADER_STDINT(gstdint.h)
145 # Check to see if -pthread or -lpthread is needed. Prefer the former.
146 # In case the pthread.h system header is not found, this test will fail.
149 # Darwin doesn't need the -pthread option since threads are in libSystem
152 [#include <pthread.h>
153 void *g(void *d) { return NULL; }],
154 [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
159 XPCFLAGS=" -Wc,-pthread"
162 [CFLAGS="$save_CFLAGS" LIBS="-lpthread $LIBS"
165 [#include <pthread.h>
166 void *g(void *d) { return NULL; }],
167 [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
169 [AC_MSG_ERROR([Pthreads are required to build libgomp])])])
171 # Check for functions needed.
172 AC_CHECK_FUNCS(getloadavg clock_gettime)
174 # Check for broken semaphore implementation on darwin.
175 # sem_init returns: sem_init error: Function not implemented.
178 AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,
179 Define if the POSIX Semaphores do not work on your system.)
182 case "$enable_linux_futex" in
184 # If headers don't have gettid/futex syscalls definition, then
185 # default to no, otherwise there will be compile time failures.
186 # Otherwise, default to yes. If we don't detect we are
187 # compiled/linked against NPTL and not cross-compiling, check
188 # if programs are run by default against NPTL and if not, issue
190 enable_linux_futex=no
193 [#include <sys/syscall.h>
195 [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],
199 #define _GNU_SOURCE 1
202 pthread_t th; void *status;],
203 [pthread_tryjoin_np (th, &status);])],[enable_linux_futex=yes],
204 [if test x$cross_compiling = xno; then
205 if getconf GNU_LIBPTHREAD_VERSION 2>/dev/null \
206 | LC_ALL=C grep -i NPTL > /dev/null 2>/dev/null; then
207 AC_MSG_WARN([The kernel might not support futex or gettid syscalls.
208 If so, please configure with --disable-linux-futex])
211 enable_linux_futex=yes])])
216 [#include <sys/syscall.h>
218 [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],[],
219 [AC_MSG_ERROR([SYS_gettid and SYS_futex required for --enable-linux-futex])])
225 # At least for glibc, clock_gettime is in librt. But don't pull that
226 # in if it still doesn't give us the function we want.
227 if test $ac_cv_func_clock_gettime = no; then
228 AC_CHECK_LIB(rt, clock_gettime,
230 AC_DEFINE(HAVE_CLOCK_GETTIME,
231 [Define to 1 if you have the `clock_gettime' function.])])
234 # See if we support thread-local storage.
237 # See what sort of export controls are availible.
238 LIBGOMP_CHECK_ATTRIBUTE_VISIBILITY
239 LIBGOMP_CHECK_ATTRIBUTE_DLLEXPORT
240 LIBGOMP_CHECK_ATTRIBUTE_ALIAS
241 LIBGOMP_ENABLE_SYMVERS
243 # Get target configury.
244 . ${srcdir}/configure.tgt
245 CFLAGS="$save_CFLAGS $XCFLAGS"
247 # Check for __sync_val_compare_and_swap, but only after the target has
248 # had a chance to set XCFLAGS.
249 LIBGOMP_CHECK_SYNC_BUILTINS
251 XCFLAGS="$XCFLAGS$XPCFLAGS"
253 AC_SUBST(config_path)
258 CFLAGS="$save_CFLAGS"
261 if test ${multilib} = yes; then
262 multilib_arg="--enable-multilib"
267 # Set up the set of libraries that we need to link against for libgomp.
268 # Note that the GOMP_SELF_SPEC in gcc.c will force -pthread for -fopenmp,
269 # which will force linkage against -lpthread (or equivalent for the system).
270 # That's not 100% ideal, but about the best we can do easily.
271 if test $enable_shared = yes; then
272 link_gomp="-lgomp %{static: $LIBS}"
274 link_gomp="-lgomp $LIBS"
278 AM_CONDITIONAL([USE_FORTRAN], [test "$ac_cv_fc_compiler_gnu" = yes])
280 # ??? 2006-01-24: Paulo committed to asking autoconf folk to document
281 # and export AC_COMPUTE_INT. If that happens, then we'll need to remove
282 # the underscore here and update the PREREQ. If it doesn't, then we'll
283 # need to copy this macro to our acinclude.m4.
284 save_CFLAGS="$CFLAGS"
285 for i in $config_path; do
286 if test -f $srcdir/config/$i/omp-lock.h; then
287 CFLAGS="$CFLAGS -include $srcdir/config/$i/omp-lock.h"
292 _AC_COMPUTE_INT([sizeof (omp_lock_t)], [OMP_LOCK_SIZE],,
293 [AC_MSG_ERROR([unsupported system, cannot find sizeof (omp_lock_t)])])
294 _AC_COMPUTE_INT([__alignof (omp_lock_t)], [OMP_LOCK_ALIGN])
295 _AC_COMPUTE_INT([sizeof (omp_nest_lock_t)], [OMP_NEST_LOCK_SIZE])
296 _AC_COMPUTE_INT([__alignof (omp_nest_lock_t)], [OMP_NEST_LOCK_ALIGN])
298 # If the lock fits in an integer, then arrange for Fortran to use that
299 # integer. If it doesn't, then arrange for Fortran to use a pointer.
300 # Except that we don't have a way at present to multi-lib the installed
301 # Fortran modules, so we assume 8 bytes for pointers, regardless of the
303 OMP_LOCK_KIND=$OMP_LOCK_SIZE
304 OMP_NEST_LOCK_KIND=$OMP_NEST_LOCK_SIZE
305 if test $OMP_LOCK_SIZE -gt 8 || test $OMP_LOCK_ALIGN -gt $OMP_LOCK_SIZE; then
308 if test $OMP_NEST_LOCK_SIZE -gt 8 || test $OMP_NEST_LOCK_ALIGN -gt $OMP_NEST_LOCK_SIZE; then
312 AC_SUBST(OMP_LOCK_SIZE)
313 AC_SUBST(OMP_LOCK_ALIGN)
314 AC_SUBST(OMP_NEST_LOCK_SIZE)
315 AC_SUBST(OMP_NEST_LOCK_ALIGN)
316 AC_SUBST(OMP_LOCK_KIND)
317 AC_SUBST(OMP_NEST_LOCK_KIND)
318 CFLAGS="$save_CFLAGS"
320 AC_CONFIG_FILES(omp.h omp_lib.h omp_lib.f90 libgomp_f.h)
321 AC_CONFIG_FILES(Makefile testsuite/Makefile libgomp.spec)