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