add a macro for large file support and autoconf < 2.54 , from wxWindows

diff --git a/macros/Makefile.am b/macros/Makefile.am
index 0fbad467e7426ae9d78158eb5a07e73e4b437f6d..4c7a38bf13b8add66c533e72ea137550a31394e1 100644 (file)
--- a/macros/Makefile.am
+++ b/macros/Makefile.am
@@ -9,4 +9,5 @@ EXTRA_DIST = \
        quota-check.m4          \
        srvloc.m4               \
        ssl-check.m4            \
+       largefile-check.m4      \
        snprintf-check.m4

diff --git a/macros/largefile-check.m4 b/macros/largefile-check.m4
new file mode 100644 (file)
index 0000000..ec526bd
--- /dev/null
+++ b/macros/largefile-check.m4
@@ -0,0 +1,63 @@
+dnl -------------------------------------------------------------------
+dnl This test for largefile support was written by Vadim Zeitlin for 
+dnl wxWindows. 
+dnl -------------------------------------------------------------------
+
+dnl WX_SYS_LARGEFILE_TEST
+dnl
+dnl NB: original autoconf test was checking if compiler supported 6 bit off_t
+dnl     arithmetic properly but this failed miserably with gcc under Linux
+dnl     whereas the system still supports 64 bit files, so now simply check
+dnl     that off_t is big enough
+define(WX_SYS_LARGEFILE_TEST,
+[typedef struct {
+    unsigned int field: sizeof(off_t) == 8;
+} wxlf;
+])
+
+dnl WX_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR)
+define(WX_SYS_LARGEFILE_MACRO_VALUE,
+[
+    AC_CACHE_CHECK([for $1 value needed for large files], [$3],
+        [
+          AC_TRY_COMPILE([#define $1 $2
+                          #include <sys/types.h>],
+                         WX_SYS_LARGEFILE_TEST,
+                         [$3=$2],
+                         [$3=no])
+        ]
+    )
+
+    if test "$$3" != no; then
+        wx_largefile=yes
+        AC_DEFINE_UNQUOTED([$1], [$$3])
+    fi
+])
+
+dnl AC_SYS_LARGEFILE
+dnl ----------------
+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.
+dnl For more details about this brain damage please see:
+dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
+AC_DEFUN([AC_SYS_LARGEFILE],
+[AC_ARG_ENABLE(largefile,
+               [  --disable-largefile     omit support for large files])
+if test "$enable_largefile" != no; then
+    dnl _FILE_OFFSET_BITS==64 is needed for Linux, Solaris, ...
+    dnl _LARGE_FILES -- for AIX
+    wx_largefile=no
+    WX_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64, ac_cv_sys_file_offset_bits) 
+    if test "x$wx_largefile" != "xyes"; then
+        WX_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1, ac_cv_sys_large_files)
+    fi
+
+    AC_MSG_CHECKING(if large file support is available)
+    if test "x$wx_largefile" = "xyes"; then
+        AC_DEFINE(HAVE_LARGEFILE_SUPPORT)
+    fi
+    AC_MSG_RESULT($wx_largefile)
+fi
+])
+
+dnl ----------end of largefile test------------------------------------