Initial implementation of -fmacro-prefix-map and -ffile-prefix-map

GCC 8 implements -fmacro-prefix-map. Like -fdebug-prefix-map, it replaces a string prefix for the __FILE__ macro.
-ffile-prefix-map is the union of -fdebug-prefix-map and -fmacro-prefix-map

Reviewed By: rnk, Lekensteyn, maskray

Differential Revision: https://reviews.llvm.org/D49466

1 files changed, 13 insertions, 0 deletions

diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp b/clang/lib/Driver/ToolChains/Gnu.cpp
index 4c6956d54b7..1a729f112bd 100644
--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -868,6 +868,19 @@ void tools::gnutools::Assembler::ConstructJob(Compilation &C,
   }
   }
 
+  for (const Arg *A : Args.filtered(options::OPT_ffile_prefix_map_EQ,
+                                    options::OPT_fdebug_prefix_map_EQ)) {
+    StringRef Map = A->getValue();
+    if (Map.find('=') == StringRef::npos)
+      D.Diag(diag::err_drv_invalid_argument_to_option)
+          << Map << A->getOption().getName();
+    else {
+      CmdArgs.push_back(Args.MakeArgString("--debug-prefix-map"));
+      CmdArgs.push_back(Args.MakeArgString(Map));
+    }
+    A->claim();
+  }
+
   Args.AddAllArgs(CmdArgs, options::OPT_I);
   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);