From 8bc3959537adae26b470c8223845555ea26693cc Mon Sep 17 00:00:00 2001
From: Fangrui Song <i@maskray.me>
Date: Sun, 15 Jan 2023 12:10:05 -0800
Subject: [PATCH] Use raw module format to fix -gmodules crash

To avoid `llvm::report_fatal_error("unknown module format")` in getPCHContainerWriter.
See https://github.com/llvm/llvm-project/commit/a3e2ff19e59c587ea14611eb64400c6d0ecabcee
---
 src/clang_tu.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/clang_tu.cc b/src/clang_tu.cc
index 9e026652..2762aa8c 100644
--- a/src/clang_tu.cc
+++ b/src/clang_tu.cc
@@ -175,6 +175,8 @@ buildCompilerInvocation(const std::string &main, std::vector<const char *> args,
   ci->getPreprocessorOpts().ImplicitPCHInclude.clear();
   ci->getPreprocessorOpts().PrecompiledPreambleBytes = {0, false};
   ci->getPreprocessorOpts().PCHThroughHeader.clear();
+
+  ci->getHeaderSearchOpts().ModuleFormat = "raw";
   return ci;
 }