libgfortran/acinclude.m4

   1 m4_include(../config/acx.m4)
   2 m4_include(../config/no-executables.m4)
   3 m4_include(../config/math.m4)
   4 m4_include(../config/ax_check_define.m4)
   5
   6 dnl Check that we have a working GNU Fortran compiler
   7 AC_DEFUN([LIBGFOR_WORKING_GFORTRAN], [
   8 AC_MSG_CHECKING([whether the GNU Fortran compiler is working])
   9 AC_LANG_PUSH([Fortran])
  10 AC_COMPILE_IFELSE([[
  11       program foo
  12       real, parameter :: bar = sin (12.34 / 2.5)
  13       end program foo]],
  14     [AC_MSG_RESULT([yes])],
  15     [AC_MSG_RESULT([no])
  16      AC_MSG_ERROR([GNU Fortran is not working; please report a bug in http://gcc.gnu.org/bugzilla, attaching $PWD/config.log])
  17     ])
  18 AC_LANG_POP([Fortran])
  19 ])
  20
  21
  22 sinclude(../libtool.m4)
  23 dnl The lines below arrange for aclocal not to bring an installed
  24 dnl libtool.m4 into aclocal.m4, while still arranging for automake to
  25 dnl add a definition of LIBTOOL to Makefile.in.
  26 ifelse(,,,[AC_SUBST(LIBTOOL)
  27 AC_DEFUN([AM_PROG_LIBTOOL])
  28 AC_DEFUN([AC_LIBTOOL_DLOPEN])
  29 AC_DEFUN([AC_PROG_LD])
  30 ])
  31
  32 dnl Check whether the target supports hidden visibility.
  33 AC_DEFUN([LIBGFOR_CHECK_ATTRIBUTE_VISIBILITY], [
  34   AC_CACHE_CHECK([whether the target supports hidden visibility],
  35                  libgfor_cv_have_attribute_visibility, [
  36   save_CFLAGS="$CFLAGS"
  37   CFLAGS="$CFLAGS -Werror"
  38   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[void __attribute__((visibility("hidden"))) foo(void) { }]], [])],
  39                     libgfor_cv_have_attribute_visibility=yes,
  40                     libgfor_cv_have_attribute_visibility=no)
  41   CFLAGS="$save_CFLAGS"])
  42   if test $libgfor_cv_have_attribute_visibility = yes; then
  43     AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1,
  44       [Define to 1 if the target supports __attribute__((visibility(...))).])
  45   fi])
  46
  47 dnl Check whether the target supports symbol aliases.
  48 AC_DEFUN([LIBGFOR_CHECK_ATTRIBUTE_ALIAS], [
  49   AC_CACHE_CHECK([whether the target supports symbol aliases],
  50                  libgfor_cv_have_attribute_alias, [
  51   AC_LINK_IFELSE([AC_LANG_PROGRAM([[
  52 void foo(void) { }
  53 extern void bar(void) __attribute__((alias("foo")));]],
  54     [[bar();]])], libgfor_cv_have_attribute_alias=yes, libgfor_cv_have_attribute_alias=no)])
  55   if test $libgfor_cv_have_attribute_alias = yes; then
  56     AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1,
  57       [Define to 1 if the target supports __attribute__((alias(...))).])
  58   fi])
  59
  60 dnl Check whether the target supports __sync_fetch_and_add.
  61 AC_DEFUN([LIBGFOR_CHECK_SYNC_FETCH_AND_ADD], [
  62   AC_CACHE_CHECK([whether the target supports __sync_fetch_and_add],
  63                  libgfor_cv_have_sync_fetch_and_add, [
  64   AC_LINK_IFELSE([AC_LANG_PROGRAM([[int foovar = 0;]], [[
  65 if (foovar <= 0) return __sync_fetch_and_add (&foovar, 1);
  66 if (foovar > 10) return __sync_add_and_fetch (&foovar, -1);]])],
  67               libgfor_cv_have_sync_fetch_and_add=yes, libgfor_cv_have_sync_fetch_and_add=no)])
  68   if test $libgfor_cv_have_sync_fetch_and_add = yes; then
  69     AC_DEFINE(HAVE_SYNC_FETCH_AND_ADD, 1,
  70               [Define to 1 if the target supports __sync_fetch_and_add])
  71   fi])
  72
  73 dnl Check for pragma weak.
  74 AC_DEFUN([LIBGFOR_GTHREAD_WEAK], [
  75   AC_CACHE_CHECK([whether pragma weak works],
  76                  libgfor_cv_have_pragma_weak, [
  77   gfor_save_CFLAGS="$CFLAGS"
  78   CFLAGS="$CFLAGS -Wunknown-pragmas"
  79   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
  80 void foo (void);
  81 #pragma weak foo
  82 ]], [[if (foo) foo ();]])],
  83                     libgfor_cv_have_pragma_weak=yes, libgfor_cv_have_pragma_weak=no)])
  84   if test $libgfor_cv_have_pragma_weak = yes; then
  85     AC_DEFINE(SUPPORTS_WEAK, 1,
  86               [Define to 1 if the target supports #pragma weak])
  87   fi
  88   case "$host" in
  89     *-*-darwin* | *-*-hpux* | *-*-cygwin* | *-*-mingw* | *-*-musl* )
  90       AC_DEFINE(GTHREAD_USE_WEAK, 0,
  91                 [Define to 0 if the target shouldn't use #pragma weak])
  92       ;;
  93   esac])
  94
  95 dnl Check whether target effectively supports weakref
  96 AC_DEFUN([LIBGFOR_CHECK_WEAKREF], [
  97   AC_CACHE_CHECK([whether the target supports weakref],
  98                  libgfor_cv_have_weakref, [
  99   save_CFLAGS="$CFLAGS"
 100   CFLAGS="$CFLAGS -Wunknown-pragmas -Werror"
 101   AC_LINK_IFELSE([AC_LANG_PROGRAM([[
 102 static int mytoto (int) __attribute__((__weakref__("toto")));
 103 ]], [[return (mytoto != 0);]])],
 104                  libgfor_cv_have_weakref=yes, libgfor_cv_have_weakref=no)
 105   CFLAGS="$save_CFLAGS"])
 106   if test $libgfor_cv_have_weakref = yes; then
 107     AC_DEFINE(SUPPORTS_WEAKREF, 1,
 108               [Define to 1 if the target supports weakref])
 109   fi])
 110
 111 dnl Check whether target can unlink a file still open.
 112 AC_DEFUN([LIBGFOR_CHECK_UNLINK_OPEN_FILE], [
 113   AC_CACHE_CHECK([whether the target can unlink an open file],
 114                   libgfor_cv_have_unlink_open_file, [
 115   AC_RUN_IFELSE([AC_LANG_SOURCE([[
 116 #include <errno.h>
 117 #include <fcntl.h>
 118 #include <unistd.h>
 119 #include <sys/stat.h>
 120
 121 int main ()
 122 {
 123   int fd;
 124
 125   fd = open ("testfile", O_RDWR | O_CREAT, S_IWUSR | S_IRUSR);
 126   if (fd <= 0)
 127     return 0;
 128   if (unlink ("testfile") == -1)
 129     return 1;
 130   write (fd, "This is a test\n", 15);
 131   close (fd);
 132
 133   if (open ("testfile", O_RDONLY) == -1 && errno == ENOENT)
 134     return 0;
 135   else
 136     return 1;
 137 }]])], libgfor_cv_have_unlink_open_file=yes, libgfor_cv_have_unlink_open_file=no, [
 138 case "${target}" in
 139   *mingw*) libgfor_cv_have_unlink_open_file=no ;;
 140   *) libgfor_cv_have_unlink_open_file=yes;;
 141 esac])])
 142 if test x"$libgfor_cv_have_unlink_open_file" = xyes; then
 143   AC_DEFINE(HAVE_UNLINK_OPEN_FILE, 1, [Define if target can unlink open files.])
 144 fi])
 145
 146 dnl Check whether CRLF is the line terminator
 147 AC_DEFUN([LIBGFOR_CHECK_CRLF], [
 148   AC_CACHE_CHECK([whether the target has CRLF as line terminator],
 149                   libgfor_cv_have_crlf, [
 150   AC_RUN_IFELSE([AC_LANG_SOURCE([[
 151 /* This test program should exit with status 0 if system uses a CRLF as
 152    line terminator, and status 1 otherwise.
 153    Since it is used to check for mingw systems, and should return 0 in any
 154    other case, in case of a failure we will not use CRLF.  */
 155 #include <sys/stat.h>
 156 #include <stdlib.h>
 157 #include <fcntl.h>
 158 #include <stdio.h>
 159
 160 int main ()
 161 {
 162 #ifndef O_BINARY
 163   exit(1);
 164 #else
 165   int fd, bytes;
 166   char buff[5];
 167
 168   fd = open ("foo", O_WRONLY | O_CREAT | O_TRUNC, S_IRWXU);
 169   if (fd < 0)
 170     exit(1);
 171   if (write (fd, "\n", 1) < 0)
 172     perror ("write");
 173
 174   close (fd);
 175
 176   if ((fd = open ("foo", O_RDONLY | O_BINARY, S_IRWXU)) < 0)
 177     exit(1);
 178   bytes = read (fd, buff, 5);
 179   if (bytes == 2 && buff[0] == '\r' && buff[1] == '\n')
 180     exit(0);
 181   else
 182     exit(1);
 183 #endif
 184 }]])], libgfor_cv_have_crlf=yes, libgfor_cv_have_crlf=no, [
 185 case "${target}" in
 186   *mingw*) libgfor_cv_have_crlf=yes ;;
 187   *) libgfor_cv_have_crlf=no;;
 188 esac])])
 189 if test x"$libgfor_cv_have_crlf" = xyes; then
 190   AC_DEFINE(HAVE_CRLF, 1, [Define if CRLF is line terminator.])
 191 fi])
 192
 193 dnl Check whether the st_ino and st_dev stat fields taken together uniquely
 194 dnl identify the file within the system. This is should be true for POSIX
 195 dnl systems; it is known to be false on mingw32.
 196 AC_DEFUN([LIBGFOR_CHECK_WORKING_STAT], [
 197   AC_CACHE_CHECK([whether the target stat is reliable],
 198                   libgfor_cv_have_working_stat, [
 199   AC_RUN_IFELSE([AC_LANG_SOURCE([[
 200 #include <stdio.h>
 201 #include <sys/types.h>
 202 #include <sys/stat.h>
 203 #include <unistd.h>
 204
 205 int main ()
 206 {
 207   FILE *f, *g;
 208   struct stat st1, st2;
 209
 210   f = fopen ("foo", "w");
 211   g = fopen ("bar", "w");
 212   if (stat ("foo", &st1) != 0 || stat ("bar", &st2))
 213     return 1;
 214   if (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino)
 215     return 1;
 216   fclose(f);
 217   fclose(g);
 218   return 0;
 219 }]])], libgfor_cv_have_working_stat=yes, libgfor_cv_have_working_stat=no, [
 220 case "${target}" in
 221   *mingw*) libgfor_cv_have_working_stat=no ;;
 222   *) libgfor_cv_have_working_stat=yes;;
 223 esac])])
 224 if test x"$libgfor_cv_have_working_stat" = xyes; then
 225   AC_DEFINE(HAVE_WORKING_STAT, 1, [Define if target has a reliable stat.])
 226 fi])
 227
 228 dnl Checks for fpsetmask function.
 229 AC_DEFUN([LIBGFOR_CHECK_FPSETMASK], [
 230   AC_CACHE_CHECK([whether fpsetmask is present], libgfor_cv_have_fpsetmask, [
 231     AC_LINK_IFELSE([AC_LANG_PROGRAM([[
 232 #if HAVE_FLOATINGPOINT_H
 233 # include <floatingpoint.h>
 234 #endif /* HAVE_FLOATINGPOINT_H */
 235 #if HAVE_IEEEFP_H
 236 # include <ieeefp.h>
 237 #endif /* HAVE_IEEEFP_H */]],[[fpsetmask(0);]])],
 238     eval "libgfor_cv_have_fpsetmask=yes", eval "libgfor_cv_have_fpsetmask=no")
 239   ])
 240   if test x"$libgfor_cv_have_fpsetmask" = xyes; then
 241     have_fpsetmask=yes
 242     AC_DEFINE(HAVE_FPSETMASK, 1, [Define if you have fpsetmask.])
 243   fi
 244 ])
 245
 246 dnl Check whether we have a mingw that provides a __mingw_snprintf function
 247 AC_DEFUN([LIBGFOR_CHECK_MINGW_SNPRINTF], [
 248   AC_CACHE_CHECK([whether __mingw_snprintf is present], libgfor_cv_have_mingw_snprintf, [
 249     AC_LINK_IFELSE([AC_LANG_PROGRAM([[
 250 #include <stdio.h>
 251 extern int __mingw_snprintf (char *, size_t, const char *, ...);
 252 ]],[[
 253 __mingw_snprintf (NULL, 0, "%d\n", 1);
 254 ]])],
 255     eval "libgfor_cv_have_mingw_snprintf=yes", eval "libgfor_cv_have_mingw_snprintf=no")
 256   ])
 257   if test x"$libgfor_cv_have_mingw_snprintf" = xyes; then
 258     AC_DEFINE(HAVE_MINGW_SNPRINTF, 1, [Define if you have __mingw_snprintf.])
 259   fi
 260 ])
 261
 262 dnl Check whether we have a __float128 type
 263 AC_DEFUN([LIBGFOR_CHECK_FLOAT128], [
 264   LIBQUADSPEC=
 265
 266   if test "x$enable_libquadmath_support" != xno; then
 267
 268   AC_CACHE_CHECK([whether we have a usable __float128 type],
 269                  libgfor_cv_have_float128, [
 270    GCC_TRY_COMPILE_OR_LINK([
 271     typedef _Complex float __attribute__((mode(TC))) __complex128;
 272
 273     __float128 foo (__float128 x)
 274     {
 275
 276      __complex128 z1, z2;
 277
 278      z1 = x;
 279      z2 = x / 7.Q;
 280      z2 /= z1;
 281
 282      return (__float128) z2;
 283     }
 284
 285     __float128 bar (__float128 x)
 286     {
 287       return x * __builtin_huge_valq ();
 288     }
 289   ],[
 290     foo (1.2Q);
 291     bar (1.2Q);
 292   ],[
 293     libgfor_cv_have_float128=yes
 294   ],[
 295     libgfor_cv_have_float128=no
 296 ])])
 297
 298   if test "x$libgfor_cv_have_float128" = xyes; then
 299     AC_DEFINE(HAVE_FLOAT128, 1, [Define if have a usable __float128 type.])
 300
 301     dnl Check whether -Wl,--as-needed resp. -Wl,-zignore is supported
 302     dnl
 303     dnl Turn warnings into error to avoid testsuite breakage.  So enable
 304     dnl AC_LANG_WERROR, but there's currently (autoconf 2.64) no way to turn
 305     dnl it off again.  As a workaround, save and restore werror flag like
 306     dnl AC_PATH_XTRA.
 307     dnl Cf. http://gcc.gnu.org/ml/gcc-patches/2010-05/msg01889.html
 308     ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag=$ac_[]_AC_LANG_ABBREV[]_werror_flag
 309     AC_CACHE_CHECK([whether --as-needed/-z ignore works],
 310       [libgfor_cv_have_as_needed],
 311       [
 312       # Test for native Solaris options first.
 313       # No whitespace after -z to pass it through -Wl.
 314       libgfor_cv_as_needed_option="-zignore"
 315       libgfor_cv_no_as_needed_option="-zrecord"
 316       save_LDFLAGS="$LDFLAGS"
 317       LDFLAGS="$LDFLAGS -Wl,$libgfor_cv_as_needed_option -lm -Wl,$libgfor_cv_no_as_needed_option"
 318       libgfor_cv_have_as_needed=no
 319       AC_LANG_WERROR
 320       AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
 321                      [libgfor_cv_have_as_needed=yes],
 322                      [libgfor_cv_have_as_needed=no])
 323       LDFLAGS="$save_LDFLAGS"
 324       if test "x$libgfor_cv_have_as_needed" = xno; then
 325         libgfor_cv_as_needed_option="--as-needed"
 326         libgfor_cv_no_as_needed_option="--no-as-needed"
 327         save_LDFLAGS="$LDFLAGS"
 328         LDFLAGS="$LDFLAGS -Wl,$libgfor_cv_as_needed_option -lm -Wl,$libgfor_cv_no_as_needed_option"
 329         libgfor_cv_have_as_needed=no
 330         AC_LANG_WERROR
 331         AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
 332                        [libgfor_cv_have_as_needed=yes],
 333                        [libgfor_cv_have_as_needed=no])
 334         LDFLAGS="$save_LDFLAGS"
 335       fi
 336       ac_[]_AC_LANG_ABBREV[]_werror_flag=$ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag
 337     ])
 338
 339     dnl For static libgfortran linkage, depend on libquadmath only if needed.
 340     if test "x$libgfor_cv_have_as_needed" = xyes; then
 341       LIBQUADSPEC="%{static-libgfortran:$libgfor_cv_as_needed_option} -lquadmath %{static-libgfortran:$libgfor_cv_no_as_needed_option}"
 342     else
 343       LIBQUADSPEC="-lquadmath"
 344     fi
 345     if test -f ../libquadmath/libquadmath.la; then
 346       LIBQUADLIB=../libquadmath/libquadmath.la
 347       LIBQUADLIB_DEP=../libquadmath/libquadmath.la
 348       LIBQUADINCLUDE='-I$(srcdir)/../libquadmath'
 349     else
 350       LIBQUADLIB="-lquadmath"
 351       LIBQUADLIB_DEP=
 352       LIBQUADINCLUDE=
 353     fi
 354   fi
 355   else
 356     # for --disable-quadmath
 357     LIBQUADLIB=
 358     LIBQUADLIB_DEP=
 359     LIBQUADINCLUDE=
 360   fi
 361
 362   dnl For the spec file
 363   AC_SUBST(LIBQUADSPEC)
 364   AC_SUBST(LIBQUADLIB)
 365   AC_SUBST(LIBQUADLIB_DEP)
 366   AC_SUBST(LIBQUADINCLUDE)
 367
 368   dnl We need a conditional for the Makefile
 369   AM_CONDITIONAL(LIBGFOR_BUILD_QUAD, [test "x$libgfor_cv_have_float128" = xyes])
 370 ])
 371
 372
 373 dnl Check whether we have strerror_r
 374 AC_DEFUN([LIBGFOR_CHECK_STRERROR_R], [
 375   dnl Check for three-argument POSIX version of strerror_r
 376   ac_save_CFLAGS="$CFLAGS"
 377   CFLAGS="-Wimplicit-function-declaration -Werror"
 378   AC_TRY_COMPILE([#define _GNU_SOURCE 1
 379                   #include <string.h>
 380                   #include <locale.h>],
 381                   [char s[128]; strerror_r(5, s, 128);],
 382                   AC_DEFINE(HAVE_STRERROR_R, 1,
 383                   [Define if strerror_r is available in <string.h>.]),)
 384   CFLAGS="$ac_save_CFLAGS"
 385
 386   dnl Check for two-argument version of strerror_r (e.g. for VxWorks)
 387   ac_save_CFLAGS="$CFLAGS"
 388   CFLAGS="-Wimplicit-function-declaration -Werror"
 389   AC_TRY_COMPILE([#define _GNU_SOURCE 1
 390                   #include <string.h>
 391                   #include <locale.h>],
 392                   [char s[128]; strerror_r(5, s);],
 393                   AC_DEFINE(HAVE_STRERROR_R_2ARGS, 1,
 394                   [Define if strerror_r takes two arguments and is available in <string.h>.]),)
 395   CFLAGS="$ac_save_CFLAGS"
 396 ])
 397
 398 dnl Check for AVX
 399
 400 AC_DEFUN([LIBGFOR_CHECK_AVX], [
 401   ac_save_CFLAGS="$CFLAGS"
 402   CFLAGS="-O2 -mavx"
 403   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 404   void _mm256_zeroall (void)
 405         {
 406            __builtin_ia32_vzeroall ();
 407         }]], [[]])],
 408         AC_DEFINE(HAVE_AVX, 1,
 409         [Define if AVX instructions can be compiled.]),
 410         [])
 411   CFLAGS="$ac_save_CFLAGS"
 412 ])
 413
 414 dnl Check for AVX2
 415
 416 AC_DEFUN([LIBGFOR_CHECK_AVX2], [
 417   ac_save_CFLAGS="$CFLAGS"
 418   CFLAGS="-O2 -mavx2"
 419   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 420   typedef long long __v4di __attribute__ ((__vector_size__ (32)));
 421         __v4di
 422         mm256_is32_andnotsi256  (__v4di __X, __v4di __Y)
 423         {
 424            return __builtin_ia32_andnotsi256 (__X, __Y);
 425         }]], [[]])],
 426         AC_DEFINE(HAVE_AVX2, 1,
 427         [Define if AVX2 instructions can be compiled.]),
 428         [])
 429   CFLAGS="$ac_save_CFLAGS"
 430 ])
 431
 432 dnl Check for AVX512f
 433
 434 AC_DEFUN([LIBGFOR_CHECK_AVX512F], [
 435   ac_save_CFLAGS="$CFLAGS"
 436   CFLAGS="-O2 -mavx512f"
 437   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 438         typedef double __m512d __attribute__ ((__vector_size__ (64)));
 439         __m512d _mm512_add (__m512d a)
 440         {
 441           __m512d b = __builtin_ia32_addpd512_mask (a, a, a, 1, 4);
 442           /* For -m64/-mx32 also verify that code will work even if
 443              the target uses call saved zmm16+ and needs to emit
 444              unwind info for them (e.g. on mingw).  See PR79127.  */
 445 #ifdef __x86_64__
 446           asm volatile ("" : : : "zmm16", "zmm17", "zmm18", "zmm19");
 447 #endif
 448           return b;
 449         }]], [[]])],
 450         AC_DEFINE(HAVE_AVX512F, 1,
 451         [Define if AVX512f instructions can be compiled.]),
 452         [])
 453   CFLAGS="$ac_save_CFLAGS"
 454 ])