libgfortran/acinclude.m4

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