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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
])
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