patch 8.2.0541: Travis CI does not give compiler warnings
Problem: Travis CI does not give compiler warnings.
Solution: Add flags for warnings. Fix uncovered problems. (Ozaki Kiichi,
closes #5898)
diff --git a/src/if_ruby.c b/src/if_ruby.c
index 9b6d388..e989c01 100644
--- a/src/if_ruby.c
+++ b/src/if_ruby.c
@@ -99,6 +99,12 @@
# define rb_ary_detransient rb_ary_detransient_stub
#endif
+// On macOS pre-installed Ruby defines "SIZEOF_TIME_T" as "SIZEOF_LONG" so it
+// conflicts with the definition in config.h then causes macro-redifned warning.
+#ifdef SIZEOF_TIME_T
+# undef SIZEOF_TIME_T
+#endif
+
#include <ruby.h>
#if RUBY_VERSION >= 19
# include <ruby/encoding.h>