[clang] set DebugCompilationDir in PCHContainer

[rmaz]

This change sets the debug compilation directory when generating debug information for PCH object containers. This allows for overriding the compilation directory in debug information in precompiled pcm files.

[llvmbot]

@llvm/pr-subscribers-clang
@llvm/pr-subscribers-clang-codegen

@llvm/pr-subscribers-clang-modules

Changes

This change sets the debug compilation directory when generating debug information for PCH object containers. This allows for overriding the compilation directory in debug information in precompiled pcm files.

---

Full diff: https://github.com/llvm/llvm-project/pull/67744.diff

2 Files Affected:

• (modified) clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp (+2)
• (added) clang/test/Modules/module-debuginfo-compdir.m (+24)

diff --git a/clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp b/clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
index 9ffeef026bd1b76..ee543e40b46099d 100644
--- a/clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
+++ b/clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
@@ -161,6 +161,8 @@ class PCHContainerGenerator : public ASTConsumer {
     CodeGenOpts.setDebugInfo(llvm::codegenoptions::FullDebugInfo);
     CodeGenOpts.setDebuggerTuning(CI.getCodeGenOpts().getDebuggerTuning());
     CodeGenOpts.DwarfVersion = CI.getCodeGenOpts().DwarfVersion;
+    CodeGenOpts.DebugCompilationDir =
+        CI.getInvocation().getCodeGenOpts().DebugCompilationDir;
     CodeGenOpts.DebugPrefixMap =
         CI.getInvocation().getCodeGenOpts().DebugPrefixMap;
     CodeGenOpts.DebugStrictDwarf = CI.getCodeGenOpts().DebugStrictDwarf;
diff --git a/clang/test/Modules/module-debuginfo-compdir.m b/clang/test/Modules/module-debuginfo-compdir.m
new file mode 100644
index 000000000000000..fced242624f75b3
--- /dev/null
+++ b/clang/test/Modules/module-debuginfo-compdir.m
@@ -0,0 +1,24 @@
+// UNSUPPORTED: target={{.*}}-zos{{.*}}, target={{.*}}-aix{{.*}}
+// REQUIRES: asserts
+
+// Modules:
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -x objective-c -fmodules -fmodule-format=obj \
+// RUN:   -fdebug-compilation-dir=/OVERRIDE \
+// RUN:   -fimplicit-module-maps -DMODULES -fmodules-cache-path=%t %s \
+// RUN:   -I %S/Inputs -I %t -emit-llvm -o %t.ll \
+// RUN:   -mllvm -debug-only=pchcontainer &>%t-mod.ll
+// RUN: cat %t-mod.ll | FileCheck %s
+
+// PCH:
+// RUN: %clang_cc1 -x objective-c -emit-pch -fmodule-format=obj -I %S/Inputs \
+// RUN:   -fdebug-compilation-dir=/OVERRIDE \
+// RUN:   -o %t.pch %S/Inputs/DebugObjC.h \
+// RUN:   -mllvm -debug-only=pchcontainer &>%t-pch.ll
+// RUN: cat %t-pch.ll | FileCheck %s
+
+#ifdef MODULES
+@import DebugObjC;
+#endif
+
+// CHECK: !DIFile(filename: "{{.*}}DebugObjC{{(\.h)?}}", directory: "/OVERRIDE")