From 88f72854157486050a8f1e46151369e48d10b4f5 Mon Sep 17 00:00:00 2001
From: Nico Weber <nicolasweber@gmx.de>
Date: Tue, 4 Sep 2018 18:00:14 +0000
Subject: [PATCH] clang-cl: Pass /Brepro to linker if it was passed to the
 compiler

Differential Revision: https://reviews.llvm.org/D51635

llvm-svn: 341390
---
 clang/lib/Driver/ToolChains/MSVC.cpp |  9 +++++++++
 clang/test/Driver/msvc-link.c        | 12 ++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/clang/lib/Driver/ToolChains/MSVC.cpp b/clang/lib/Driver/ToolChains/MSVC.cpp
index 4df43ac8ce90..105544840cfb 100644
--- a/clang/lib/Driver/ToolChains/MSVC.cpp
+++ b/clang/lib/Driver/ToolChains/MSVC.cpp
@@ -355,6 +355,15 @@ void visualstudio::Linker::ConstructJob(Compilation &C, const JobAction &JA,
                   options::OPT__SLASH_Zd))
     CmdArgs.push_back("-debug");
 
+  // Pass on /Brepro if it was passed to the compiler.
+  // Note that /Brepro maps to -mno-incremental-linker-compatible.
+  bool DefaultIncrementalLinkerCompatible =
+      C.getDefaultToolChain().getTriple().isWindowsMSVCEnvironment();
+  if (!Args.hasFlag(options::OPT_mincremental_linker_compatible,
+                    options::OPT_mno_incremental_linker_compatible,
+                    DefaultIncrementalLinkerCompatible))
+    CmdArgs.push_back("-Brepro");
+
   bool DLL = Args.hasArg(options::OPT__SLASH_LD, options::OPT__SLASH_LDd,
                          options::OPT_shared);
   if (DLL) {
diff --git a/clang/test/Driver/msvc-link.c b/clang/test/Driver/msvc-link.c
index 8fe57331ee47..412f4ad05d94 100644
--- a/clang/test/Driver/msvc-link.c
+++ b/clang/test/Driver/msvc-link.c
@@ -3,6 +3,7 @@
 // BASIC: "-out:a.exe"
 // BASIC: "-defaultlib:libcmt"
 // BASIC: "-nologo"
+// BASIC-NOT: "-Brepro"
 
 // RUN: %clang -target i686-pc-windows-msvc -shared -o a.dll -### %s 2>&1 | FileCheck --check-prefix=DLL %s
 // DLL: link.exe"
@@ -16,3 +17,14 @@
 // LIBPATH: "-libpath:/usr/lib"
 // LIBPATH: "-nologo"
 
+// RUN: %clang_cl /Brepro -### %s 2>&1 | FileCheck --check-prefix=REPRO %s
+// REPRO: link.exe"
+// REPRO: "-out:msvc-link.exe"
+// REPRO: "-nologo"
+// REPRO: "-Brepro"
+
+// RUN: %clang_cl /Brepro- -### %s 2>&1 | FileCheck --check-prefix=NOREPRO %s
+// NOREPRO: link.exe"
+// NOREPRO: "-out:msvc-link.exe"
+// NOREPRO: "-nologo"
+// NOREPRO-NOT: "-Brepro"