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The compiler fails if LLVM modules are enabled and it cannot write its module
cache. This patch detects and rejects the fake, non-existant $HOME used in Nix
builds.
We could simply return false in `cache_directory`, but that completely disables
module caching, and may unnecessarily slow down builds. Instead, let it use
'/tmp/.cache'.
--- a/lib/Support/Unix/Path.inc
+++ b/lib/Support/Unix/Path.inc
@@ -1380,6 +1380,9 @@ bool user_config_directory(SmallVectorImpl<char> &result) {
if (!home_directory(result)) {
return false;
}
+ if (std::equal(result.begin(), result.end(), "/homeless-shelter")) {
+ return false;
+ }
append(result, ".config");
return true;
}
@@ -1401,6 +1404,9 @@ bool cache_directory(SmallVectorImpl<char> &result) {
if (!home_directory(result)) {
return false;
}
+ if (std::equal(result.begin(), result.end(), "/homeless-shelter")) {
+ system_temp_directory(true/*ErasedOnReboot*/, result);
+ }
append(result, ".cache");
return true;
}
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