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 symbol aliases.
  47 AC_DEFUN([LIBGFOR_CHECK_ATTRIBUTE_ALIAS], [
  48   AC_CACHE_CHECK([whether the target supports symbol aliases],
  49                  libgfor_cv_have_attribute_alias, [
  50   AC_LINK_IFELSE([AC_LANG_PROGRAM([[
  51 void foo(void) { }
  52 extern void bar(void) __attribute__((alias("foo")));]],
  53     [[bar();]])], libgfor_cv_have_attribute_alias=yes, libgfor_cv_have_attribute_alias=no)])
  54   if test $libgfor_cv_have_attribute_alias = yes; then
  55     AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1,
  56       [Define to 1 if the target supports __attribute__((alias(...))).])
  57   fi])
  58
  59 dnl Check whether the target supports __sync_fetch_and_add.
  60 AC_DEFUN([LIBGFOR_CHECK_SYNC_FETCH_AND_ADD], [
  61   AC_CACHE_CHECK([whether the target supports __sync_fetch_and_add],
  62                  libgfor_cv_have_sync_fetch_and_add, [
  63   AC_LINK_IFELSE([AC_LANG_PROGRAM([[int foovar = 0;]], [[
  64 if (foovar <= 0) return __sync_fetch_and_add (&foovar, 1);
  65 if (foovar > 10) return __sync_add_and_fetch (&foovar, -1);]])],
  66               libgfor_cv_have_sync_fetch_and_add=yes, libgfor_cv_have_sync_fetch_and_add=no)])
  67   if test $libgfor_cv_have_sync_fetch_and_add = yes; then
  68     AC_DEFINE(HAVE_SYNC_FETCH_AND_ADD, 1,
  69               [Define to 1 if the target supports __sync_fetch_and_add])
  70   fi])
  71
  72 dnl Check for pragma weak.
  73 AC_DEFUN([LIBGFOR_GTHREAD_WEAK], [
  74   AC_CACHE_CHECK([whether pragma weak works],
  75                  libgfor_cv_have_pragma_weak, [
  76   gfor_save_CFLAGS="$CFLAGS"
  77   CFLAGS="$CFLAGS -Wunknown-pragmas"
  78   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
  79 void foo (void);
  80 #pragma weak foo
  81 ]], [[if (foo) foo ();]])],
  82                     libgfor_cv_have_pragma_weak=yes, libgfor_cv_have_pragma_weak=no)])
  83   if test $libgfor_cv_have_pragma_weak = yes; then
  84     AC_DEFINE(SUPPORTS_WEAK, 1,
  85               [Define to 1 if the target supports #pragma weak])
  86   fi
  87   case "$host" in
  88     *-*-darwin* | *-*-hpux* | *-*-cygwin* | *-*-mingw* | *-*-musl* )
  89       AC_DEFINE(GTHREAD_USE_WEAK, 0,
  90                 [Define to 0 if the target shouldn't use #pragma weak])
  91       ;;
  92   esac])
  93
  94 dnl Check whether target effectively supports weakref
  95 AC_DEFUN([LIBGFOR_CHECK_WEAKREF], [
  96   AC_CACHE_CHECK([whether the target supports weakref],
  97                  libgfor_cv_have_weakref, [
  98   save_CFLAGS="$CFLAGS"
  99   CFLAGS="$CFLAGS -Wunknown-pragmas -Werror"
 100   AC_LINK_IFELSE([AC_LANG_PROGRAM([[
 101 static int mytoto (int) __attribute__((__weakref__("toto")));
 102 ]], [[return (mytoto != 0);]])],
 103                  libgfor_cv_have_weakref=yes, libgfor_cv_have_weakref=no)
 104   CFLAGS="$save_CFLAGS"])
 105   if test $libgfor_cv_have_weakref = yes; then
 106     AC_DEFINE(SUPPORTS_WEAKREF, 1,
 107               [Define to 1 if the target supports weakref])
 108   fi])
 109
 110 dnl Check whether target can unlink a file still open.
 111 AC_DEFUN([LIBGFOR_CHECK_UNLINK_OPEN_FILE], [
 112   AC_CACHE_CHECK([whether the target can unlink an open file],
 113                   libgfor_cv_have_unlink_open_file, [
 114   AC_RUN_IFELSE([AC_LANG_SOURCE([[
 115 #include <errno.h>
 116 #include <fcntl.h>
 117 #include <unistd.h>
 118 #include <sys/stat.h>
 119
 120 int main ()
 121 {
 122   int fd;
 123
 124   fd = open ("testfile", O_RDWR | O_CREAT, S_IWUSR | S_IRUSR);
 125   if (fd <= 0)
 126     return 0;
 127   if (unlink ("testfile") == -1)
 128     return 1;
 129   write (fd, "This is a test\n", 15);
 130   close (fd);
 131
 132   if (open ("testfile", O_RDONLY) == -1 && errno == ENOENT)
 133     return 0;
 134   else
 135     return 1;
 136 }]])], libgfor_cv_have_unlink_open_file=yes, libgfor_cv_have_unlink_open_file=no, [
 137 case "${target}" in
 138   *mingw*) libgfor_cv_have_unlink_open_file=no ;;
 139   *) libgfor_cv_have_unlink_open_file=yes;;
 140 esac])])
 141 if test x"$libgfor_cv_have_unlink_open_file" = xyes; then
 142   AC_DEFINE(HAVE_UNLINK_OPEN_FILE, 1, [Define if target can unlink open files.])
 143 fi])
 144
 145 dnl Check whether CRLF is the line terminator
 146 AC_DEFUN([LIBGFOR_CHECK_CRLF], [
 147   AC_CACHE_CHECK([whether the target has CRLF as line terminator],
 148                   libgfor_cv_have_crlf, [
 149   AC_RUN_IFELSE([AC_LANG_SOURCE([[
 150 /* This test program should exit with status 0 if system uses a CRLF as
 151    line terminator, and status 1 otherwise.
 152    Since it is used to check for mingw systems, and should return 0 in any
 153    other case, in case of a failure we will not use CRLF.  */
 154 #include <sys/stat.h>
 155 #include <stdlib.h>
 156 #include <fcntl.h>
 157 #include <stdio.h>
 158
 159 int main ()
 160 {
 161 #ifndef O_BINARY
 162   exit(1);
 163 #else
 164   int fd, bytes;
 165   char buff[5];
 166
 167   fd = open ("foo", O_WRONLY | O_CREAT | O_TRUNC, S_IRWXU);
 168   if (fd < 0)
 169     exit(1);
 170   if (write (fd, "\n", 1) < 0)
 171     perror ("write");
 172
 173   close (fd);
 174
 175   if ((fd = open ("foo", O_RDONLY | O_BINARY, S_IRWXU)) < 0)
 176     exit(1);
 177   bytes = read (fd, buff, 5);
 178   if (bytes == 2 && buff[0] == '\r' && buff[1] == '\n')
 179     exit(0);
 180   else
 181     exit(1);
 182 #endif
 183 }]])], libgfor_cv_have_crlf=yes, libgfor_cv_have_crlf=no, [
 184 case "${target}" in
 185   *mingw*) libgfor_cv_have_crlf=yes ;;
 186   *) libgfor_cv_have_crlf=no;;
 187 esac])])
 188 if test x"$libgfor_cv_have_crlf" = xyes; then
 189   AC_DEFINE(HAVE_CRLF, 1, [Define if CRLF is line terminator.])
 190 fi])
 191
 192 dnl Check whether the st_ino and st_dev stat fields taken together uniquely
 193 dnl identify the file within the system. This is should be true for POSIX
 194 dnl systems; it is known to be false on mingw32.
 195 AC_DEFUN([LIBGFOR_CHECK_WORKING_STAT], [
 196   AC_CACHE_CHECK([whether the target stat is reliable],
 197                   libgfor_cv_have_working_stat, [
 198   AC_RUN_IFELSE([AC_LANG_SOURCE([[
 199 #include <stdio.h>
 200 #include <sys/types.h>
 201 #include <sys/stat.h>
 202 #include <unistd.h>
 203
 204 int main ()
 205 {
 206   FILE *f, *g;
 207   struct stat st1, st2;
 208
 209   f = fopen ("foo", "w");
 210   g = fopen ("bar", "w");
 211   if (stat ("foo", &st1) != 0 || stat ("bar", &st2))
 212     return 1;
 213   if (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino)
 214     return 1;
 215   fclose(f);
 216   fclose(g);
 217   return 0;
 218 }]])], libgfor_cv_have_working_stat=yes, libgfor_cv_have_working_stat=no, [
 219 case "${target}" in
 220   *mingw*) libgfor_cv_have_working_stat=no ;;
 221   *) libgfor_cv_have_working_stat=yes;;
 222 esac])])
 223 if test x"$libgfor_cv_have_working_stat" = xyes; then
 224   AC_DEFINE(HAVE_WORKING_STAT, 1, [Define if target has a reliable stat.])
 225 fi])
 226
 227 dnl Checks for fpsetmask function.
 228 AC_DEFUN([LIBGFOR_CHECK_FPSETMASK], [
 229   AC_CACHE_CHECK([whether fpsetmask is present], libgfor_cv_have_fpsetmask, [
 230     AC_LINK_IFELSE([AC_LANG_PROGRAM([[
 231 #if HAVE_FLOATINGPOINT_H
 232 # include <floatingpoint.h>
 233 #endif /* HAVE_FLOATINGPOINT_H */
 234 #if HAVE_IEEEFP_H
 235 # include <ieeefp.h>
 236 #endif /* HAVE_IEEEFP_H */]],[[fpsetmask(0);]])],
 237     eval "libgfor_cv_have_fpsetmask=yes", eval "libgfor_cv_have_fpsetmask=no")
 238   ])
 239   if test x"$libgfor_cv_have_fpsetmask" = xyes; then
 240     have_fpsetmask=yes
 241     AC_DEFINE(HAVE_FPSETMASK, 1, [Define if you have fpsetmask.])
 242   fi
 243 ])
 244
 245 dnl Check whether we have a mingw that provides a __mingw_snprintf function
 246 AC_DEFUN([LIBGFOR_CHECK_MINGW_SNPRINTF], [
 247   AC_CACHE_CHECK([whether __mingw_snprintf is present], libgfor_cv_have_mingw_snprintf, [
 248     AC_LINK_IFELSE([AC_LANG_PROGRAM([[
 249 #include <stdio.h>
 250 extern int __mingw_snprintf (char *, size_t, const char *, ...);
 251 ]],[[
 252 __mingw_snprintf (NULL, 0, "%d\n", 1);
 253 ]])],
 254     eval "libgfor_cv_have_mingw_snprintf=yes", eval "libgfor_cv_have_mingw_snprintf=no")
 255   ])
 256   if test x"$libgfor_cv_have_mingw_snprintf" = xyes; then
 257     AC_DEFINE(HAVE_MINGW_SNPRINTF, 1, [Define if you have __mingw_snprintf.])
 258   fi
 259 ])
 260
 261 dnl Check whether we have a __float128 type
 262 AC_DEFUN([LIBGFOR_CHECK_FLOAT128], [
 263   LIBQUADSPEC=
 264
 265   if test "x$enable_libquadmath_support" != xno; then
 266
 267   AC_CACHE_CHECK([whether we have a usable __float128 type],
 268                  libgfor_cv_have_float128, [
 269    GCC_TRY_COMPILE_OR_LINK([
 270     typedef _Complex float __attribute__((mode(TC))) __complex128;
 271
 272     __float128 foo (__float128 x)
 273     {
 274
 275      __complex128 z1, z2;
 276
 277      z1 = x;
 278      z2 = x / 7.Q;
 279      z2 /= z1;
 280
 281      return (__float128) z2;
 282     }
 283
 284     __float128 bar (__float128 x)
 285     {
 286       return x * __builtin_huge_valq ();
 287     }
 288   ],[
 289     foo (1.2Q);
 290     bar (1.2Q);
 291   ],[
 292     libgfor_cv_have_float128=yes
 293   ],[
 294     libgfor_cv_have_float128=no
 295 ])])
 296
 297   if test "x$libgfor_cv_have_float128" = xyes; then
 298     AC_DEFINE(HAVE_FLOAT128, 1, [Define if have a usable __float128 type.])
 299
 300     dnl Check whether -Wl,--as-needed resp. -Wl,-zignore is supported
 301     dnl
 302     dnl Turn warnings into error to avoid testsuite breakage.  So enable
 303     dnl AC_LANG_WERROR, but there's currently (autoconf 2.64) no way to turn
 304     dnl it off again.  As a workaround, save and restore werror flag like
 305     dnl AC_PATH_XTRA.
 306     dnl Cf. http://gcc.gnu.org/ml/gcc-patches/2010-05/msg01889.html
 307     ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag=$ac_[]_AC_LANG_ABBREV[]_werror_flag
 308     AC_CACHE_CHECK([whether --as-needed/-z ignore works],
 309       [libgfor_cv_have_as_needed],
 310       [
 311       # Test for native Solaris options first.
 312       # No whitespace after -z to pass it through -Wl.
 313       libgfor_cv_as_needed_option="-zignore"
 314       libgfor_cv_no_as_needed_option="-zrecord"
 315       save_LDFLAGS="$LDFLAGS"
 316       LDFLAGS="$LDFLAGS -Wl,$libgfor_cv_as_needed_option -lm -Wl,$libgfor_cv_no_as_needed_option"
 317       libgfor_cv_have_as_needed=no
 318       AC_LANG_WERROR
 319       AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
 320                      [libgfor_cv_have_as_needed=yes],
 321                      [libgfor_cv_have_as_needed=no])
 322       LDFLAGS="$save_LDFLAGS"
 323       if test "x$libgfor_cv_have_as_needed" = xno; then
 324         libgfor_cv_as_needed_option="--as-needed"
 325         libgfor_cv_no_as_needed_option="--no-as-needed"
 326         save_LDFLAGS="$LDFLAGS"
 327         LDFLAGS="$LDFLAGS -Wl,$libgfor_cv_as_needed_option -lm -Wl,$libgfor_cv_no_as_needed_option"
 328         libgfor_cv_have_as_needed=no
 329         AC_LANG_WERROR
 330         AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
 331                        [libgfor_cv_have_as_needed=yes],
 332                        [libgfor_cv_have_as_needed=no])
 333         LDFLAGS="$save_LDFLAGS"
 334       fi
 335       ac_[]_AC_LANG_ABBREV[]_werror_flag=$ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag
 336     ])
 337
 338     dnl For static libgfortran linkage, depend on libquadmath only if needed.
 339     if test "x$libgfor_cv_have_as_needed" = xyes; then
 340       LIBQUADSPEC="%{static-libgfortran:$libgfor_cv_as_needed_option} -lquadmath %{static-libgfortran:$libgfor_cv_no_as_needed_option}"
 341     else
 342       LIBQUADSPEC="-lquadmath"
 343     fi
 344     if test -f ../libquadmath/libquadmath.la; then
 345       LIBQUADLIB=../libquadmath/libquadmath.la
 346       LIBQUADLIB_DEP=../libquadmath/libquadmath.la
 347       LIBQUADINCLUDE='-I$(srcdir)/../libquadmath'
 348     else
 349       LIBQUADLIB="-lquadmath"
 350       LIBQUADLIB_DEP=
 351       LIBQUADINCLUDE=
 352     fi
 353   fi
 354   else
 355     # for --disable-quadmath
 356     LIBQUADLIB=
 357     LIBQUADLIB_DEP=
 358     LIBQUADINCLUDE=
 359   fi
 360
 361   dnl For the spec file
 362   AC_SUBST(LIBQUADSPEC)
 363   AC_SUBST(LIBQUADLIB)
 364   AC_SUBST(LIBQUADLIB_DEP)
 365   AC_SUBST(LIBQUADINCLUDE)
 366
 367   dnl We need a conditional for the Makefile
 368   AM_CONDITIONAL(LIBGFOR_BUILD_QUAD, [test "x$libgfor_cv_have_float128" = xyes])
 369 ])
 370
 371
 372 dnl Check whether we have strerror_r
 373 AC_DEFUN([LIBGFOR_CHECK_STRERROR_R], [
 374   dnl Check for three-argument POSIX version of strerror_r
 375   ac_save_CFLAGS="$CFLAGS"
 376   CFLAGS="-Wimplicit-function-declaration -Werror"
 377   AC_TRY_COMPILE([#define _GNU_SOURCE 1
 378                   #include <string.h>
 379                   #include <locale.h>],
 380                   [char s[128]; strerror_r(5, s, 128);],
 381                   AC_DEFINE(HAVE_STRERROR_R, 1,
 382                   [Define if strerror_r is available in <string.h>.]),)
 383   CFLAGS="$ac_save_CFLAGS"
 384
 385   dnl Check for two-argument version of strerror_r (e.g. for VxWorks)
 386   ac_save_CFLAGS="$CFLAGS"
 387   CFLAGS="-Wimplicit-function-declaration -Werror"
 388   AC_TRY_COMPILE([#define _GNU_SOURCE 1
 389                   #include <string.h>
 390                   #include <locale.h>],
 391                   [char s[128]; strerror_r(5, s);],
 392                   AC_DEFINE(HAVE_STRERROR_R_2ARGS, 1,
 393                   [Define if strerror_r takes two arguments and is available in <string.h>.]),)
 394   CFLAGS="$ac_save_CFLAGS"
 395 ])
 396
 397 dnl Check for AVX
 398
 399 AC_DEFUN([LIBGFOR_CHECK_AVX], [
 400   ac_save_CFLAGS="$CFLAGS"
 401   CFLAGS="-O2 -mavx"
 402   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 403   void _mm256_zeroall (void)
 404         {
 405            __builtin_ia32_vzeroall ();
 406         }]], [[]])],
 407         AC_DEFINE(HAVE_AVX, 1,
 408         [Define if AVX instructions can be compiled.]),
 409         [])
 410   CFLAGS="$ac_save_CFLAGS"
 411 ])
 412
 413 dnl Check for AVX2
 414
 415 AC_DEFUN([LIBGFOR_CHECK_AVX2], [
 416   ac_save_CFLAGS="$CFLAGS"
 417   CFLAGS="-O2 -mavx2"
 418   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 419   typedef long long __v4di __attribute__ ((__vector_size__ (32)));
 420         __v4di
 421         mm256_is32_andnotsi256  (__v4di __X, __v4di __Y)
 422         {
 423            return __builtin_ia32_andnotsi256 (__X, __Y);
 424         }]], [[]])],
 425         AC_DEFINE(HAVE_AVX2, 1,
 426         [Define if AVX2 instructions can be compiled.]),
 427         [])
 428   CFLAGS="$ac_save_CFLAGS"
 429 ])
 430
 431 dnl Check for AVX512f
 432
 433 AC_DEFUN([LIBGFOR_CHECK_AVX512F], [
 434   ac_save_CFLAGS="$CFLAGS"
 435   CFLAGS="-O2 -mavx512f"
 436   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 437         typedef double __m512d __attribute__ ((__vector_size__ (64)));
 438         __m512d _mm512_add (__m512d a)
 439         {
 440           __m512d b = __builtin_ia32_addpd512_mask (a, a, a, 1, 4);
 441           /* For -m64/-mx32 also verify that code will work even if
 442              the target uses call saved zmm16+ and needs to emit
 443              unwind info for them (e.g. on mingw).  See PR79127.  */
 444 #ifdef __x86_64__
 445           asm volatile ("" : : : "zmm16", "zmm17", "zmm18", "zmm19");
 446 #endif
 447           return b;
 448         }]], [[]])],
 449         AC_DEFINE(HAVE_AVX512F, 1,
 450         [Define if AVX512f instructions can be compiled.]),
 451         [])
 452   CFLAGS="$ac_save_CFLAGS"
 453 ])