chore: config.h defines HAVE___UINT128_T (#1216)

igraph · Feb 8, 2024 · 790375b · 790375b
2 parents b0df457 + 75660c5
commit 790375b
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/vendor/config.h b/src/vendor/config.h
@@ -17,7 +17,9 @@
 
 /* #undef HAVE__UMUL128 */
 /* #undef HAVE___UMULH */
-#define HAVE___UINT128_T 1
+#if defined(__GNUC__) && defined(__SIZEOF_INT128__)
+#  define HAVE___UINT128_T 1
+#endif
 
 #define HAVE_GLPK 1
 #define HAVE_LIBXML 1