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Detect off_t size using AC_CHECK_SIZEOF because it works also when cross-compiling in autoconf-2.50 and higher.

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git-svn-id: http://svn.irssi.org/repos/irssi/trunk@4392 dbcabf3a-b0e7-0310-adc4-f8d773084564
This commit is contained in:
Emanuele Giaquinta 2006-10-27 17:14:57 +00:00 committed by exg
parent d5c75a3208
commit 710fb0c279
1 changed files with 6 additions and 23 deletions
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29
configure.in
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@ -1,4 +1,5 @@
AC_INIT(src)
AC_PREREQ(2.50)
# we don't want VERSION in our config.h
if grep '^#undef VERSION' $srcdir/config.h.in >/dev/null; then
@ -285,41 +286,23 @@ AC_DEFINE_UNQUOTED(_FILE_OFFSET_BITS, $preferred_off_t_bits)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(long long)
AC_CHECK_SIZEOF(off_t)
dnl * older autoconfs don't include sys/types.h, so do it manually
AC_MSG_CHECKING([size of off_t])
AC_TRY_RUN([
#include <stdio.h>
#include <sys/types.h>
int main() {
FILE *f=fopen("conftestval", "w");
if (!f) exit(1);
fprintf(f, "%d\n", sizeof(off_t));
return 0;
}
], [
sizeof_off_t=`cat conftestval`
rm -f conftestval
], [
AC_ERROR([Unsupported off_t size])
])
AC_MSG_RESULT($sizeof_off_t)
if test $sizeof_off_t = 8; then
if test $ac_cv_sizeof_off_t = 8; then
offt_64bit=yes
else
offt_64bit=no
fi
if test x$sizeof_off_t = x$ac_cv_sizeof_long; then
if test x$ac_cv_sizeof_off_t = x$ac_cv_sizeof_long; then
# try to use unsigned long always first
AC_DEFINE_UNQUOTED(PRIuUOFF_T, "lu")
AC_DEFINE(UOFF_T_LONG)
elif test x$sizeof_off_t = x$ac_cv_sizeof_int; then
elif test x$ac_cv_sizeof_off_t = x$ac_cv_sizeof_int; then
# next try int
AC_DEFINE_UNQUOTED(PRIuUOFF_T, "u")
AC_DEFINE(UOFF_T_INT)
elif test x$sizeof_off_t = x$ac_cv_sizeof_long_long; then
elif test x$ac_cv_sizeof_off_t = x$ac_cv_sizeof_long_long; then
# and finally long long
AC_DEFINE_UNQUOTED(PRIuUOFF_T, "llu")
AC_DEFINE(UOFF_T_LONG_LONG)