Fix #480 Build error on CentOS

phaag · Nov 1, 2023 · cbc617f · cbc617f
1 parent fded574
commit cbc617f
Showing 1 changed file with 9 additions and 3 deletions.
diff --git a/m4/c17.m4 b/m4/c17.m4
@@ -3,9 +3,15 @@ AC_DEFUN([AX_CHECK_C17],
     [AX_APPEND_FLAG([-std=gnu17])],
     [AX_CHECK_COMPILE_FLAG([-std=c17],
         [AX_APPEND_FLAG([-std=c17])],
-        [AX_CHECK_COMPILE_FLAG([-std=c99],
-            [AX_APPEND_FLAG([-std=c99])],
-            [AC_MSG_ERROR([C compiled does not support at least C99!])])
+        [AX_CHECK_COMPILE_FLAG([-std=gnu11],
+            [AX_APPEND_FLAG([-std=gnu11])],
+            [AX_CHECK_COMPILE_FLAG([-std=c11],
+                [AX_APPEND_FLAG([-std=c11])],
+                [AX_CHECK_COMPILE_FLAG([-std=c99],
+                    [AX_APPEND_FLAG([-std=c99])],
+                    [AC_MSG_ERROR([C compiled does not support at least C99!])])
+                ])
+            ])
         ])
     ])
 ])