diff options
Diffstat (limited to 'libgfortran/acinclude.m4')
| -rw-r--r-- | libgfortran/acinclude.m4 | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/libgfortran/acinclude.m4 b/libgfortran/acinclude.m4 index dbf25f3c636..a94dafafacb 100644 --- a/libgfortran/acinclude.m4 +++ b/libgfortran/acinclude.m4 @@ -349,3 +349,38 @@ esac])] if test x"$have_broken_fpclassify" = xyes; then AC_DEFINE(HAVE_BROKEN_FPCLASSIFY, 1, [Define if fpclassify is broken.]) fi]) + +dnl Check whether the st_ino and st_dev stat fields taken together uniquely +dnl identify the file within the system. This is should be true for POSIX +dnl systems; it is known to be false on mingw32. +AC_DEFUN([LIBGFOR_CHECK_WORKING_STAT], [ + AC_CACHE_CHECK([whether the target stat is reliable], + have_working_stat, [ + AC_TRY_RUN([ +#include <stdio.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> + +int main () +{ + FILE *f, *g; + struct stat st1, st2; + + f = fopen ("foo", "w"); + g = fopen ("bar", "w"); + if (stat ("foo", &st1) != 0 || stat ("bar", &st2)) + return 1; + if (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino) + return 1; + fclose(f); + fclose(g); + return 0; +}], have_working_stat=yes, have_working_stat=no, [ +case "${target}" in + *mingw*) have_working_stat=no ;; + *) have_working_stat=yes;; +esac])]) +if test x"$have_working_stat" = xyes; then + AC_DEFINE(HAVE_WORKING_STAT, 1, [Define if target has a reliable stat.]) +fi]) |
