[PATCH] D145526: [clang][DependencyScanner] Cache modulemap stat failures

[Michael Spencer via Phabricator via cfe-commits]

Bigcheese updated this revision to Diff 503164.
Bigcheese added a comment.

Also handle `module.map`.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D145526/new/

https://reviews.llvm.org/D145526

Files:
  clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp


Index: clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp
===================================================================
--- clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp
+++ clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp
@@ -181,7 +181,11 @@
   StringRef Ext = llvm::sys::path::extension(Filename);
   if (Ext.empty())
     return false; // This may be the module cache directory.
-  // Only cache stat failures on source files.
+  // Only cache stat failures on files that are not expected to change during
+  // the build.
+  StringRef FName = llvm::sys::path::filename(Filename);
+  if (FName == "module.modulemap" || FName == "module.map")
+    return true;
   return shouldScanForDirectivesBasedOnExtension(Filename);
 }
 


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