diff options
Diffstat (limited to 'acinclude.m4')
| -rw-r--r-- | acinclude.m4 | 55 |
1 files changed, 36 insertions, 19 deletions
diff --git a/acinclude.m4 b/acinclude.m4 index 2809dcfc4..db38757d7 100644 --- a/acinclude.m4 +++ b/acinclude.m4 @@ -1,4 +1,4 @@ -#serial 12 +#serial 19 dnl By default, many hosts won't let programs access large files; dnl one must use special compiler options to get large-file access to work. @@ -11,7 +11,14 @@ dnl Internal subroutine of AC_SYS_LARGEFILE. dnl AC_SYS_LARGEFILE_TEST_INCLUDES AC_DEFUN(AC_SYS_LARGEFILE_TEST_INCLUDES, [[#include <sys/types.h> - int a[(off_t) 9223372036854775807 == 9223372036854775807 ? 1 : -1]; + /* Check that off_t can represent 2**63 - 1 correctly. + We can't simply "#define LARGE_OFF_T 9223372036854775807", + since some C++ compilers masquerading as C compilers + incorrectly reject 9223372036854775807. */ +# define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62)) + int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721 + && LARGE_OFF_T % 2147483647 == 1) + ? 1 : -1]; ]]) dnl Internal subroutine of AC_SYS_LARGEFILE. @@ -19,14 +26,11 @@ dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR, COMMENT, INCLUDES, F AC_DEFUN(AC_SYS_LARGEFILE_MACRO_VALUE, [AC_CACHE_CHECK([for $1 value needed for large files], $3, [$3=no - AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES -$5 - , + AC_TRY_COMPILE([$5], [$6], , [AC_TRY_COMPILE([#define $1 $2] -AC_SYS_LARGEFILE_TEST_INCLUDES -$5 +[$5] , [$6], [$3=$2])])]) @@ -35,7 +39,8 @@ $5 fi]) AC_DEFUN(AC_SYS_LARGEFILE, - [AC_ARG_ENABLE(largefile, + [AC_REQUIRE([AC_PROG_CC]) + AC_ARG_ENABLE(largefile, [ --disable-largefile omit support for large files]) if test "$enable_largefile" != no; then @@ -58,18 +63,30 @@ AC_DEFUN(AC_SYS_LARGEFILE, AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64, ac_cv_sys_file_offset_bits, - [Number of bits in a file offset, on hosts where this is settable.]) - AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1, - ac_cv_sys_largefile_source, - [Define to make ftello visible on some hosts (e.g. HP-UX 10.20).], - [#include <stdio.h>], [return !ftello;]) + [Number of bits in a file offset, on hosts where this is settable.], + AC_SYS_LARGEFILE_TEST_INCLUDES) AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1, ac_cv_sys_large_files, - [Define for large files, on AIX-style hosts.]) -dnl lftp does not need ftello, and _XOPEN_SOURCE=500 makes resolv.h fail. -dnl AC_SYS_LARGEFILE_MACRO_VALUE(_XOPEN_SOURCE, 500, -dnl ac_cv_sys_xopen_source, -dnl [Define to make ftello visible on some hosts (e.g. glibc 2.1.3).], -dnl [#include <stdio.h>], [return !ftello;]) + [Define for large files, on AIX-style hosts.], + AC_SYS_LARGEFILE_TEST_INCLUDES) fi ]) + +AC_DEFUN(AC_FUNC_FSEEKO, + [AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1, + ac_cv_sys_largefile_source, + [Define to make fseeko visible on some hosts (e.g. glibc 2.2).], + [#include <stdio.h>], [return !fseeko;]) + # We used to try defining _XOPEN_SOURCE=500 too, to work around a bug + # in glibc 2.1.3, but that breaks too many other things. + # If you want fseeko and ftello with glibc, upgrade to a fixed glibc. + + AC_CACHE_CHECK([for fseeko], ac_cv_func_fseeko, + [ac_cv_func_fseeko=no + AC_TRY_LINK([#include <stdio.h>], + [return fseeko && fseeko (stdin, 0, 0);], + [ac_cv_func_fseeko=yes])]) + if test $ac_cv_func_fseeko != no; then + AC_DEFINE(HAVE_FSEEKO, 1, + [Define if fseeko (and presumably ftello) exists and is declared.]) + fi]) |