X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=config%2Fconfigure;h=fbf174fd8c95df5e0c591c917699af805102f445;hb=8c860f3d7fd2d0e028df1c2e252366a4c9f98130;hp=33e9ba26a00da52d3c769e536635483d7f3a7b17;hpb=813aa7d002f141db50ff6d2d276542ed91088043;p=bup.git

diff --git a/config/configure b/config/configure
index 33e9ba2..fbf174f 100755
--- a/config/configure
+++ b/config/configure
@@ -97,6 +97,25 @@ AC_CHECK_FUNCS utimes
 AC_CHECK_FUNCS lutimes
 
 
+builtin_mul_overflow_code="
+#include <stddef.h>
+int main(int argc, char **argv)
+{
+    size_t n = 0, size = 0, total;
+    __builtin_mul_overflow(n, size, &total);
+    return 0;
+}
+"
+
+TLOGN "checking for __builtin_mul_overflow"
+if bup_try_c_code "$builtin_mul_overflow_code"; then
+    AC_DEFINE BUP_HAVE_BUILTIN_MUL_OVERFLOW 1
+    TLOG ' (found)'
+else
+    TLOG ' (not found)'
+fi
+
+
 AC_CHECK_FUNCS mincore
 
 mincore_incore_code="