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Nix compiles with _FORTIFY_SOURCE enabled. Fix error due to -Werror and an unused return value warning.
--- swift-corelibs-libdispatch/src/internal.h 2019-04-26 09:33:38.287289099 +0200
+++ swift-corelibs-libdispatch/src/internal.h 2019-04-26 15:31:10.485334128 +0200
@@ -1053,7 +1053,7 @@
#else
#define _dispatch_client_assert_fail(fmt, ...) do { \
char *_msg = NULL; \
- asprintf(&_msg, "%s" fmt, DISPATCH_ASSERTION_FAILED_MESSAGE, \
+ (void)asprintf(&_msg, "%s" fmt, DISPATCH_ASSERTION_FAILED_MESSAGE, \
##__VA_ARGS__); \
_dispatch_assert_crash(_msg); \
free(_msg); \
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