diff options
Diffstat (limited to '')
| -rw-r--r-- | m4/glibc.m4 | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/m4/glibc.m4 b/m4/glibc.m4 new file mode 100644 index 0000000..5d722aa --- /dev/null +++ b/m4/glibc.m4 @@ -0,0 +1,49 @@ +AC_DEFUN([DOVECOT_GLIBC], [ + AC_CACHE_CHECK([whether we have glibc],i_cv_have_glibc,[ + AC_TRY_COMPILE([ + #include <stdlib.h> + #ifdef __GLIBC__ + we have glibc + #endif + ],, [ + i_cv_have_glibc=no + ], [ + i_cv_have_glibc=yes + ]) + ]) + if test "$i_cv_have_glibc" = "yes"; then + AC_DEFINE(PREAD_WRAPPERS,, [Define if pread/pwrite needs _XOPEN_SOURCE 500]) + fi + dnl * Old glibcs have broken posix_fallocate(). Make sure not to use it. + dnl * It may also be broken in AIX. + AC_CACHE_CHECK([whether posix_fallocate() works],i_cv_posix_fallocate_works,[ + AC_TRY_RUN([ + #define _XOPEN_SOURCE 600 + #include <stdio.h> + #include <stdlib.h> + #include <fcntl.h> + #include <unistd.h> + #if defined(__GLIBC__) && (__GLIBC__ < 2 || __GLIBC_MINOR__ < 7) + possibly broken posix_fallocate + #endif + int main() { + int fd = creat("conftest.temp", 0600); + int ret; + if (fd == -1) { + perror("creat()"); + return 2; + } + ret = posix_fallocate(fd, 1024, 1024) < 0 ? 1 : 0; + unlink("conftest.temp"); + return ret; + } + ], [ + i_cv_posix_fallocate_works=yes + ], [ + i_cv_posix_fallocate_works=no + ]) + ]) + if test $i_cv_posix_fallocate_works = yes; then + AC_DEFINE(HAVE_POSIX_FALLOCATE,, [Define if you have a working posix_fallocate()]) + fi +]) |