================
@@ -161,8 +161,13 @@ static TypeCode getTypeCodeForTypeClass(Type::TypeClass
id) {
namespace {
-std::set<const FileEntry *> GetAffectingModuleMaps(const Preprocessor &PP,
- Module *RootModule) {
+std::optional<std::set<const FileEntry *>>
+GetAffectingModuleMaps(const Preprocessor &PP, Module *RootModule) {
+ // Without implicit module map search, there's no good reason to know about
+ // any module maps that are not affecting.
+ if (!PP.getHeaderSearchInfo().getHeaderSearchOpts().ImplicitModuleMaps)
+ return std::nullopt;
----------------
zygoloid wrote:
Yes, that sounds great, thank you. In our case, it's not that the module map
files are unused, it's that we specify the same `-fmodule-map-file=` flag to
all of our compilations, and so we *usually* get the information from a `.pcm`
file rather than from the module map file, and it turns out that pruning out
the repeated module maps make a rather large difference to our source location
address space usage :)
All that said, we have some other ideas for how to address the problems we're
seeing with source location address space usage. Maybe we can get to a point
where we're not relying on this at all -- I think this patch is probably the
right behavior, even though I think it's contributing to a regression for us,
so I think this new behavior should be the default, and we can clean up the
flag once we don't need it any more.
https://github.com/llvm/llvm-project/pull/87849
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