Relax fallthrough attribute detection

1219b65f · Victor Zverovich · 071794ec · 1219b65f
Commit 1219b65f authored Dec 05, 2019 by Victor Zverovich
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include/fmt/format.h include/fmt/format.h +2 -1

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--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -69,7 +69,8 @@
 #  define FMT_HAS_BUILTIN(x) 0
 #endif

-#if FMT_HAS_CPP_ATTRIBUTE(fallthrough) >= 201603 && __cplusplus >= 201703
+#if FMT_HAS_CPP_ATTRIBUTE(fallthrough) && \
+    (__cplusplus >= 201703 || FMT_GCC_VERSION != 0)
 #  define FMT_FALLTHROUGH [[fallthrough]]
 #else
 #  define FMT_FALLTHROUGH