commit 47edc57806056f3c8764241ed41b8acc72bd2ebf
author Keith Smiley <keithbsmiley@gmail.com> Thu Apr 01 02:58:58 2021 -0700
committer Copybara-Service <copybara-worker@google.com> Thu Apr 01 02:59:59 2021 -0700
tree e745ab56961c38e986afbe0bf7d6c81727ebbcf7
parent 0299cd7e17203a4ce0ea947b62a7c55f1afb8225

Silence swiftmodule timestamp warnings

As part of https://github.com/bazelbuild/bazel/pull/13091 dsymtuil started producing these warnings:

```
warning: Timestamp mismatch for bazel-out/ios-x86_64-min11.0-applebin_ios-ios_x86_64-fastbuild-ST-7786d55448f4/bin/Modules/DependencyInjection/DependencyInjection.swiftmodule: 2021-03-05 13:54:33.542331246 and 1969-12-31 16:00:00.000000000
```

In general we're happily ignoring this to get hermetic outputs instead (it's being compared against the file modification timestamp)

This change disables this warning.

It appears this feature has been around for at least 3 years https://github.com/apple/llvm-project/commit/2dd9848304c94b91399ad56189aa373fa9aebde6 so we should be good for all the versions of Xcode we support.

Relevant logic: https://github.com/apple/llvm-project/blob/902bb11a46eb82e81d7e8b34450481e143a208b2/llvm/tools/dsymutil/DwarfLinkerForBinary.cpp#L407-L421

Closes #13165.

PiperOrigin-RevId: 366215825

tools/osx/crosstool/wrapped_clang.cc

diff --git a/tools/osx/crosstool/wrapped_clang.cc b/tools/osx/crosstool/wrapped_clang.cc
index 765b7a7..bc3efd1 100644
--- a/tools/osx/crosstool/wrapped_clang.cc
+++ b/tools/osx/crosstool/wrapped_clang.cc
@@ -405,8 +405,13 @@
     return 0;
   }
 
-  std::vector<std::string> dsymutil_args = {
-      "/usr/bin/xcrun", "dsymutil", linked_binary, "-o", dsym_path, "--flat"};
+  std::vector<std::string> dsymutil_args = {"/usr/bin/xcrun",
+                                            "dsymutil",
+                                            linked_binary,
+                                            "-o",
+                                            dsym_path,
+                                            "--flat",
+                                            "--no-swiftmodule-timestamp"};
   RunSubProcess(dsymutil_args);
   return 0;
 }