[Modules] Stop creating timestamps for the modules cache and trying to
prune it when we have disabled implicit module generation and thus are
not using any cached modules.
Also update a test of explicitly generated modules to pass this CC1 flag
correctly.
This fixes an issue where Clang was dropping files into the source tree
while running its tests.
llvm-svn: 233117
diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index b23baa5..1c5b322 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -1239,9 +1239,10 @@
if (!hasASTContext())
createASTContext();
- // If we're not recursively building a module, check whether we
- // need to prune the module cache.
- if (getSourceManager().getModuleBuildStack().empty() &&
+ // If we're implicitly building modules but not currently recursively
+ // building a module, check whether we need to prune the module cache.
+ if (getLangOpts().ImplicitModules &&
+ getSourceManager().getModuleBuildStack().empty() &&
getHeaderSearchOpts().ModuleCachePruneInterval > 0 &&
getHeaderSearchOpts().ModuleCachePruneAfter > 0) {
pruneModuleCache(getHeaderSearchOpts());