libgfortran/acinclude.m4

   1 m4_include(../config/acx.m4)
   2 m4_include(../config/no-executables.m4)
   3
   4 dnl Check that we have a working GNU Fortran compiler
   5 AC_DEFUN([LIBGFOR_WORKING_GFORTRAN], [
   6 AC_MSG_CHECKING([whether the GNU Fortran compiler is working])
   7 AC_LANG_PUSH([Fortran])
   8 AC_COMPILE_IFELSE([[
   9       program foo
  10       real, parameter :: bar = sin (12.34 / 2.5)
  11       end program foo]],
  12     [AC_MSG_RESULT([yes])],
  13     [AC_MSG_RESULT([no])
  14      AC_MSG_ERROR([GNU Fortran is not working; please report a bug in http://gcc.gnu.org/bugzilla, attaching $PWD/config.log])
  15     ])
  16 AC_LANG_POP([Fortran])
  17 ])
  18
  19
  20 sinclude(../libtool.m4)
  21 dnl The lines below arrange for aclocal not to bring an installed
  22 dnl libtool.m4 into aclocal.m4, while still arranging for automake to
  23 dnl add a definition of LIBTOOL to Makefile.in.
  24 ifelse(,,,[AC_SUBST(LIBTOOL)
  25 AC_DEFUN([AM_PROG_LIBTOOL])
  26 AC_DEFUN([AC_LIBTOOL_DLOPEN])
  27 AC_DEFUN([AC_PROG_LD])
  28 ])
  29
  30 dnl Check whether the target supports hidden visibility.
  31 AC_DEFUN([LIBGFOR_CHECK_ATTRIBUTE_VISIBILITY], [
  32   AC_CACHE_CHECK([whether the target supports hidden visibility],
  33                  libgfor_cv_have_attribute_visibility, [
  34   save_CFLAGS="$CFLAGS"
  35   CFLAGS="$CFLAGS -Werror"
  36   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[void __attribute__((visibility("hidden"))) foo(void) { }]], [])],
  37                     libgfor_cv_have_attribute_visibility=yes,
  38                     libgfor_cv_have_attribute_visibility=no)
  39   CFLAGS="$save_CFLAGS"])
  40   if test $libgfor_cv_have_attribute_visibility = yes; then
  41     AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1,
  42       [Define to 1 if the target supports __attribute__((visibility(...))).])
  43   fi])
  44
  45 dnl Check whether the target supports dllexport
  46 AC_DEFUN([LIBGFOR_CHECK_ATTRIBUTE_DLLEXPORT], [
  47   AC_CACHE_CHECK([whether the target supports dllexport],
  48                  libgfor_cv_have_attribute_dllexport, [
  49   save_CFLAGS="$CFLAGS"
  50   CFLAGS="$CFLAGS -Werror"
  51   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[void __attribute__((dllexport)) foo(void) { }]], [])],
  52                     libgfor_cv_have_attribute_dllexport=yes,
  53                     libgfor_cv_have_attribute_dllexport=no)
  54   CFLAGS="$save_CFLAGS"])
  55   if test $libgfor_cv_have_attribute_dllexport = yes; then
  56     AC_DEFINE(HAVE_ATTRIBUTE_DLLEXPORT, 1,
  57       [Define to 1 if the target supports __attribute__((dllexport)).])
  58   fi])
  59
  60 dnl Check whether the target supports symbol aliases.
  61 AC_DEFUN([LIBGFOR_CHECK_ATTRIBUTE_ALIAS], [
  62   AC_CACHE_CHECK([whether the target supports symbol aliases],
  63                  libgfor_cv_have_attribute_alias, [
  64   AC_LINK_IFELSE([AC_LANG_PROGRAM([[
  65 void foo(void) { }
  66 extern void bar(void) __attribute__((alias("foo")));]],
  67     [[bar();]])], libgfor_cv_have_attribute_alias=yes, libgfor_cv_have_attribute_alias=no)])
  68   if test $libgfor_cv_have_attribute_alias = yes; then
  69     AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1,
  70       [Define to 1 if the target supports __attribute__((alias(...))).])
  71   fi])
  72
  73 dnl Check whether the target supports __sync_fetch_and_add.
  74 AC_DEFUN([LIBGFOR_CHECK_SYNC_FETCH_AND_ADD], [
  75   AC_CACHE_CHECK([whether the target supports __sync_fetch_and_add],
  76                  libgfor_cv_have_sync_fetch_and_add, [
  77   AC_LINK_IFELSE([AC_LANG_PROGRAM([[int foovar = 0;]], [[
  78 if (foovar <= 0) return __sync_fetch_and_add (&foovar, 1);
  79 if (foovar > 10) return __sync_add_and_fetch (&foovar, -1);]])],
  80               libgfor_cv_have_sync_fetch_and_add=yes, libgfor_cv_have_sync_fetch_and_add=no)])
  81   if test $libgfor_cv_have_sync_fetch_and_add = yes; then
  82     AC_DEFINE(HAVE_SYNC_FETCH_AND_ADD, 1,
  83               [Define to 1 if the target supports __sync_fetch_and_add])
  84   fi])
  85
  86 dnl Check if threads are supported.
  87 AC_DEFUN([LIBGFOR_CHECK_GTHR_DEFAULT], [
  88   AC_CACHE_CHECK([configured target thread model],
  89                  libgfor_cv_target_thread_file, [
  90 libgfor_cv_target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`])
  91
  92   if test $libgfor_cv_target_thread_file != single; then
  93     AC_DEFINE(HAVE_GTHR_DEFAULT, 1,
  94               [Define if the compiler has a thread header that is non single.])
  95   fi])
  96
  97 dnl Check for pragma weak.
  98 AC_DEFUN([LIBGFOR_GTHREAD_WEAK], [
  99   AC_CACHE_CHECK([whether pragma weak works],
 100                  libgfor_cv_have_pragma_weak, [
 101   gfor_save_CFLAGS="$CFLAGS"
 102   CFLAGS="$CFLAGS -Wunknown-pragmas"
 103   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 104 void foo (void);
 105 #pragma weak foo
 106 ]], [[if (foo) foo ();]])],
 107                     libgfor_cv_have_pragma_weak=yes, libgfor_cv_have_pragma_weak=no)])
 108   if test $libgfor_cv_have_pragma_weak = yes; then
 109     AC_DEFINE(SUPPORTS_WEAK, 1,
 110               [Define to 1 if the target supports #pragma weak])
 111   fi
 112   case "$host" in
 113     *-*-darwin* | *-*-hpux* | *-*-cygwin* | *-*-mingw* | alpha*-dec-osf* )
 114       AC_DEFINE(GTHREAD_USE_WEAK, 0,
 115                 [Define to 0 if the target shouldn't use #pragma weak])
 116       ;;
 117   esac])
 118
 119 dnl Check whether target can unlink a file still open.
 120 AC_DEFUN([LIBGFOR_CHECK_UNLINK_OPEN_FILE], [
 121   AC_CACHE_CHECK([whether the target can unlink an open file],
 122                   libgfor_cv_have_unlink_open_file, [
 123   AC_RUN_IFELSE([AC_LANG_SOURCE([[
 124 #include <errno.h>
 125 #include <fcntl.h>
 126 #include <unistd.h>
 127 #include <sys/stat.h>
 128
 129 int main ()
 130 {
 131   int fd;
 132
 133   fd = open ("testfile", O_RDWR | O_CREAT, S_IWRITE | S_IREAD);
 134   if (fd <= 0)
 135     return 0;
 136   if (unlink ("testfile") == -1)
 137     return 1;
 138   write (fd, "This is a test\n", 15);
 139   close (fd);
 140
 141   if (open ("testfile", O_RDONLY, S_IWRITE | S_IREAD) == -1 && errno == ENOENT)
 142     return 0;
 143   else
 144     return 1;
 145 }]])], libgfor_cv_have_unlink_open_file=yes, libgfor_cv_have_unlink_open_file=no, [
 146 case "${target}" in
 147   *mingw*) libgfor_cv_have_unlink_open_file=no ;;
 148   *) libgfor_cv_have_unlink_open_file=yes;;
 149 esac])])
 150 if test x"$libgfor_cv_have_unlink_open_file" = xyes; then
 151   AC_DEFINE(HAVE_UNLINK_OPEN_FILE, 1, [Define if target can unlink open files.])
 152 fi])
 153
 154 dnl Check whether CRLF is the line terminator
 155 AC_DEFUN([LIBGFOR_CHECK_CRLF], [
 156   AC_CACHE_CHECK([whether the target has CRLF as line terminator],
 157                   libgfor_cv_have_crlf, [
 158   AC_RUN_IFELSE([AC_LANG_SOURCE([[
 159 /* This test program should exit with status 0 if system uses a CRLF as
 160    line terminator, and status 1 otherwise.
 161    Since it is used to check for mingw systems, and should return 0 in any
 162    other case, in case of a failure we will not use CRLF.  */
 163 #include <sys/stat.h>
 164 #include <stdlib.h>
 165 #include <fcntl.h>
 166 #include <stdio.h>
 167
 168 int main ()
 169 {
 170 #ifndef O_BINARY
 171   exit(1);
 172 #else
 173   int fd, bytes;
 174   char buff[5];
 175
 176   fd = open ("foo", O_WRONLY | O_CREAT | O_TRUNC, S_IRWXU);
 177   if (fd < 0)
 178     exit(1);
 179   if (write (fd, "\n", 1) < 0)
 180     perror ("write");
 181
 182   close (fd);
 183
 184   if ((fd = open ("foo", O_RDONLY | O_BINARY, S_IRWXU)) < 0)
 185     exit(1);
 186   bytes = read (fd, buff, 5);
 187   if (bytes == 2 && buff[0] == '\r' && buff[1] == '\n')
 188     exit(0);
 189   else
 190     exit(1);
 191 #endif
 192 }]])], libgfor_cv_have_crlf=yes, libgfor_cv_have_crlf=no, [
 193 case "${target}" in
 194   *mingw*) libgfor_cv_have_crlf=yes ;;
 195   *) libgfor_cv_have_crlf=no;;
 196 esac])])
 197 if test x"$libgfor_cv_have_crlf" = xyes; then
 198   AC_DEFINE(HAVE_CRLF, 1, [Define if CRLF is line terminator.])
 199 fi])
 200
 201 dnl Check whether the st_ino and st_dev stat fields taken together uniquely
 202 dnl identify the file within the system. This is should be true for POSIX
 203 dnl systems; it is known to be false on mingw32.
 204 AC_DEFUN([LIBGFOR_CHECK_WORKING_STAT], [
 205   AC_CACHE_CHECK([whether the target stat is reliable],
 206                   libgfor_cv_have_working_stat, [
 207   AC_RUN_IFELSE([AC_LANG_SOURCE([[
 208 #include <stdio.h>
 209 #include <sys/types.h>
 210 #include <sys/stat.h>
 211 #include <unistd.h>
 212
 213 int main ()
 214 {
 215   FILE *f, *g;
 216   struct stat st1, st2;
 217
 218   f = fopen ("foo", "w");
 219   g = fopen ("bar", "w");
 220   if (stat ("foo", &st1) != 0 || stat ("bar", &st2))
 221     return 1;
 222   if (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino)
 223     return 1;
 224   fclose(f);
 225   fclose(g);
 226   return 0;
 227 }]])], libgfor_cv_have_working_stat=yes, libgfor_cv_have_working_stat=no, [
 228 case "${target}" in
 229   *mingw*) libgfor_cv_have_working_stat=no ;;
 230   *) libgfor_cv_have_working_stat=yes;;
 231 esac])])
 232 if test x"$libgfor_cv_have_working_stat" = xyes; then
 233   AC_DEFINE(HAVE_WORKING_STAT, 1, [Define if target has a reliable stat.])
 234 fi])
 235
 236 dnl Checks for fpsetmask function.
 237 AC_DEFUN([LIBGFOR_CHECK_FPSETMASK], [
 238   AC_CACHE_CHECK([whether fpsetmask is present], libgfor_cv_have_fpsetmask, [
 239     AC_LINK_IFELSE([AC_LANG_PROGRAM([[
 240 #if HAVE_FLOATINGPOINT_H
 241 # include <floatingpoint.h>
 242 #endif /* HAVE_FLOATINGPOINT_H */
 243 #if HAVE_IEEEFP_H
 244 # include <ieeefp.h>
 245 #endif /* HAVE_IEEEFP_H */]],[[fpsetmask(0);]])],
 246     eval "libgfor_cv_have_fpsetmask=yes", eval "libgfor_cv_have_fpsetmask=no")
 247   ])
 248   if test x"$libgfor_cv_have_fpsetmask" = xyes; then
 249     have_fpsetmask=yes
 250     AC_DEFINE(HAVE_FPSETMASK, 1, [Define if you have fpsetmask.])
 251   fi
 252 ])
 253
 254 dnl Check whether we have a mingw that provides a __mingw_snprintf function
 255 AC_DEFUN([LIBGFOR_CHECK_MINGW_SNPRINTF], [
 256   AC_CACHE_CHECK([whether __mingw_snprintf is present], libgfor_cv_have_mingw_snprintf, [
 257     AC_LINK_IFELSE([AC_LANG_PROGRAM([[
 258 #include <stdio.h>
 259 extern int __mingw_snprintf (char *, size_t, const char *, ...);
 260 ]],[[
 261 __mingw_snprintf (NULL, 0, "%d\n", 1);
 262 ]])],
 263     eval "libgfor_cv_have_mingw_snprintf=yes", eval "libgfor_cv_have_mingw_snprintf=no")
 264   ])
 265   if test x"$libgfor_cv_have_mingw_snprintf" = xyes; then
 266     AC_DEFINE(HAVE_MINGW_SNPRINTF, 1, [Define if you have __mingw_snprintf.])
 267   fi
 268 ])
 269
 270 dnl Check whether we have a broken powf implementation
 271 AC_DEFUN([LIBGFOR_CHECK_FOR_BROKEN_POWF], [
 272   AC_CACHE_CHECK([whether powf is broken], libgfor_cv_have_broken_powf, [
 273 case "${target}" in
 274   hppa*64*-*-hpux*) libgfor_cv_have_broken_powf=yes ;;
 275   *) libgfor_cv_have_broken_powf=no;;
 276 esac])
 277   if test x"$libgfor_cv_have_broken_powf" = xyes; then
 278     AC_DEFINE(HAVE_BROKEN_POWF, 1, [Define if powf is broken.])
 279   fi
 280 ])
 281
 282 dnl Check whether we have a __float128 type
 283 AC_DEFUN([LIBGFOR_CHECK_FLOAT128], [
 284   LIBQUADSPEC=
 285
 286   if test "x$enable_libquadmath_support" != xno; then
 287
 288   AC_CACHE_CHECK([whether we have a usable __float128 type],
 289                  libgfor_cv_have_float128, [
 290    GCC_TRY_COMPILE_OR_LINK([
 291     typedef _Complex float __attribute__((mode(TC))) __complex128;
 292
 293     __float128 foo (__float128 x)
 294     {
 295
 296      __complex128 z1, z2;
 297
 298      z1 = x;
 299      z2 = x / 7.Q;
 300      z2 /= z1;
 301
 302      return (__float128) z2;
 303     }
 304
 305     __float128 bar (__float128 x)
 306     {
 307       return x * __builtin_huge_valq ();
 308     }
 309   ],[
 310     foo (1.2Q);
 311     bar (1.2Q);
 312   ],[
 313     libgfor_cv_have_float128=yes
 314   ],[
 315     libgfor_cv_have_float128=no
 316 ])])
 317
 318   if test "x$libgfor_cv_have_float128" = xyes; then
 319     AC_DEFINE(HAVE_FLOAT128, 1, [Define if have a usable __float128 type.])
 320
 321     dnl Check whether -Wl,--as-needed is supported
 322     dnl
 323     dnl Turn warnings into error to avoid testsuite breakage.  So enable
 324     dnl AC_LANG_WERROR, but there's currently (autoconf 2.64) no way to turn
 325     dnl it off again.  As a workaround, save and restore werror flag like
 326     dnl AC_PATH_XTRA.
 327     dnl Cf. http://gcc.gnu.org/ml/gcc-patches/2010-05/msg01889.html
 328     ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag=$ac_[]_AC_LANG_ABBREV[]_werror_flag
 329     AC_CACHE_CHECK([whether --as-needed works],
 330       [libgfor_cv_have_as_needed],
 331       [
 332       save_LDFLAGS="$LDFLAGS"
 333       LDFLAGS="$LDFLAGS -Wl,--as-needed -lm -Wl,--no-as-needed"
 334       libgfor_cv_have_as_needed=no
 335       AC_LANG_WERROR
 336       AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
 337                      [libgfor_cv_have_as_needed=yes],
 338                      [libgfor_cv_have_as_needed=no])
 339       LDFLAGS="$save_LDFLAGS"
 340       ac_[]_AC_LANG_ABBREV[]_werror_flag=$ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag
 341     ])
 342
 343     dnl For static libgfortran linkage, depend on libquadmath only if needed.
 344     if test "x$libgfor_cv_have_as_needed" = xyes; then
 345       LIBQUADSPEC="%{static-libgfortran:--as-needed} -lquadmath %{static-libgfortran:--no-as-needed}"
 346     else
 347       LIBQUADSPEC="-lquadmath"
 348     fi
 349     if test -f ../libquadmath/libquadmath.la; then
 350       LIBQUADLIB=../libquadmath/libquadmath.la
 351       LIBQUADLIB_DEP=../libquadmath/libquadmath.la
 352       LIBQUADINCLUDE='-I$(srcdir)/../libquadmath'
 353     else
 354       LIBQUADLIB="-lquadmath"
 355       LIBQUADLIB_DEP=
 356       LIBQUADINCLUDE=
 357     fi
 358   fi
 359   else
 360     # for --disable-quadmath
 361     LIBQUADLIB=
 362     LIBQUADLIB_DEP=
 363     LIBQUADINCLUDE=
 364   fi
 365
 366   dnl For the spec file
 367   AC_SUBST(LIBQUADSPEC)
 368   AC_SUBST(LIBQUADLIB)
 369   AC_SUBST(LIBQUADLIB_DEP)
 370   AC_SUBST(LIBQUADINCLUDE)
 371
 372   dnl We need a conditional for the Makefile
 373   AM_CONDITIONAL(LIBGFOR_BUILD_QUAD, [test "x$libgfor_cv_have_float128" = xyes])
 374 ])