Support -fdebug-prefix-map for assembler source (pass to cc1as). This

is useful to omit the debug compilation dir when compiling assembly
files with -g.  Part of PR38050.

Patch by Siddhartha Bagaria!

Differential Revision: https://reviews.llvm.org/D48989

llvm-svn: 336685

1 files changed, 15 insertions, 8 deletions

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 41291397182..472a4163e55 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -600,6 +600,18 @@ static void addDebugCompDirArg(const ArgList &Args, ArgStringList &CmdArgs) {
   }
 }
 
+/// Add a CC1 and CC1AS option to specify the debug file path prefix map.
+static void addDebugPrefixMapArg(const Driver &D, const ArgList &Args, ArgStringList &CmdArgs) {
+  for (const Arg *A : Args.filtered(options::OPT_fdebug_prefix_map_EQ)) {
+    StringRef Map = A->getValue();
+    if (Map.find('=') == StringRef::npos)
+      D.Diag(diag::err_drv_invalid_argument_to_fdebug_prefix_map) << Map;
+    else
+      CmdArgs.push_back(Args.MakeArgString("-fdebug-prefix-map=" + Map));
+    A->claim();
+  }
+}
+
 /// Vectorize at all optimization levels greater than 1 except for -Oz.
 /// For -Oz the loop vectorizer is disable, while the slp vectorizer is enabled.
 static bool shouldEnableVectorizerAtOLevel(const ArgList &Args, bool isSlpVec) {
@@ -3800,14 +3812,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   // Add in -fdebug-compilation-dir if necessary.
   addDebugCompDirArg(Args, CmdArgs);
 
-  for (const Arg *A : Args.filtered(options::OPT_fdebug_prefix_map_EQ)) {
-    StringRef Map = A->getValue();
-    if (Map.find('=') == StringRef::npos)
-      D.Diag(diag::err_drv_invalid_argument_to_fdebug_prefix_map) << Map;
-    else
-      CmdArgs.push_back(Args.MakeArgString("-fdebug-prefix-map=" + Map));
-    A->claim();
-  }
+  addDebugPrefixMapArg(D, Args, CmdArgs);
 
   if (Arg *A = Args.getLastArg(options::OPT_ftemplate_depth_,
                                options::OPT_ftemplate_depth_EQ)) {
@@ -5352,6 +5357,8 @@ void ClangAs::ConstructJob(Compilation &C, const JobAction &JA,
     // Add the -fdebug-compilation-dir flag if needed.
     addDebugCompDirArg(Args, CmdArgs);
 
+    addDebugPrefixMapArg(getToolChain().getDriver(), Args, CmdArgs);
+
     // Set the AT_producer to the clang version when using the integrated
     // assembler on assembly source files.
     CmdArgs.push_back("-dwarf-debug-producer");