Modified the large file support check to do a compile-time check instead of a run...

diff --git a/configure.in b/configure.in
index 69f966b4ff79bd3db938e42fce13c3b0c570db6b..2c280455d6f95c47311e7318845e546552da802e 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -1125,19 +1125,18 @@ if test x$target_win32 = xno; then
        AC_DEFUN([LARGE_FILES], [
                large_CPPFLAGS=$CPPFLAGS
                CPPFLAGS="$CPPFLAGS $1"
-               AC_TRY_RUN([
+               AC_TRY_COMPILE([
                        #include <sys/types.h>
+                       #include <limits.h>
+               ], [
+                       # Lifted this compile time assert method from: http://www.jaggersoft.com/pubs/CVu11_3.html
+                       #define COMPILE_TIME_ASSERT(pred) \
+                               switch(0){case 0:case pred:;}
 
-                       #define BIG_OFF_T (((off_t)1<<62)-1+((off_t)1<<62))
-
-                       int main(void) {
-                               int big_off_t=((BIG_OFF_T%2147483629==721) &&
-                                              (BIG_OFF_T%2147483647==1));
-                               if(big_off_t) {
-                                       exit(0);
-                               } else {
-                                       exit(1);
-                               }
+                       int main(void)
+                       {
+                               COMPILE_TIME_ASSERT(sizeof(off_t) * CHAR_BIT == 64);
+                               return 0;
                        }
                ], [
                        AC_MSG_RESULT(ok)
@@ -1146,7 +1145,7 @@ if test x$target_win32 = xno; then
                        large_offt=yes
                ], [
                        AC_MSG_RESULT(no)
-               ], "")
+               ])
                CPPFLAGS=$large_CPPFLAGS
        ])