Import of CCTZ from GitHub.

PiperOrigin-RevId: 501343076 Change-Id: I12e04a87b9a90951f9b52bd9690cce28d03b0f29

Import of CCTZ from GitHub.
PiperOrigin-RevId: 501343076 Change-Id: I12e04a87b9a90951f9b52bd9690cce28d03b0f29
570dc02b · Abseil Team · Copybara-Service · 10ff83d9 · 570dc02b
Commit 570dc02b authored Jan 11, 2023 by Abseil Team Committed by Copybara-Service Jan 11, 2023
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absl/time/internal/cctz/src/zone_info_source.cc
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--- a/absl/time/internal/cctz/src/zone_info_source.cc
+++ b/absl/time/internal/cctz/src/zone_info_source.cc
@@ -58,7 +58,8 @@ std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource> DefaultFactory(
 // MinGW is GCC on Windows, so while it asserts __has_attribute(weak), the
 // Windows linker cannot handle that. Nor does the MinGW compiler know how to
 // pass "#pragma comment(linker, ...)" to the Windows linker.
-#if (__has_attribute(weak) || defined(__GNUC__)) && !defined(__MINGW32__)
+#if (__has_attribute(weak) || defined(__GNUC__)) && !defined(__MINGW32__) && \
+    !defined(__CYGWIN__)
 ZoneInfoSourceFactory zone_info_source_factory __attribute__((weak)) =
    DefaultFactory;
 #elif defined(_MSC_VER) && !defined(__MINGW32__) && !defined(_LIBCPP_VERSION)