Hook up symbol files to the Windows GN build.

build/toolchain/win/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/win/visual_studio_version.gni")
 import("//build/toolchain/goma.gni")
 
 # Should only be running on Windows.
 assert(is_win)
 
 # Setup the Visual Studio state.
 #
 # Its arguments are the VS path and the compiler wrapper tool. It will write
 # "environment.x86" and "environment.x64" to the build directory and return a
 # list to us.
 gyp_win_tool_path = rebase_path("//tools/gyp/pylib/gyp/win_tool.py",
                                 root_build_dir)
 exec_script("setup_toolchain.py",
             [ visual_studio_path, gyp_win_tool_path, windows_sdk_path ],
             "string")
 
 stamp_command = "$python_path gyp-win-tool stamp \$out"
 copy_command = "$python_path gyp-win-tool recursive-mirror \$in \$out"
 
+# MSVC can't share PDB files between compilers compiling C and C++ files, so
+# we construct different names for each type.
+c_pdb_suffix = " /Fd\${target_out_dir}/\${target_name}_c.pdb"
+cc_pdb_suffix = " /Fd\${target_out_dir}/\${target_name}_cc.pdb"
+
 # 32-bit toolchain -------------------------------------------------------------
 
 toolchain("32") {
   # Make these apply to all tools below.
   lib_prefix = ""
   lib_dir_prefix="/LIBPATH:"
 
-  cc_command = "ninja -t msvc -e environment.x86 -- cl.exe /nologo /showIncludes /FC @\$out.rsp /c \$in /Fo\$out /Fd\$pdbname"
+  cc_command = "ninja -t msvc -e environment.x86 -- cl.exe /nologo /showIncludes /FC @\$out.rsp /c \$in /Fo\$out"
   tool("cc") {
-    command = cc_command
+    command = cc_command + c_pdb_suffix
     description = "CC \$out"
     rspfile = "\$out.rsp"
     rspfile_content = "\$defines \$includes \$cflags \$cflags_c"
     depsformat = "msvc"
   }
   tool("cxx") {
-    command = cc_command  # Same as above
+    command = cc_command + cc_pdb_suffix
     description = "CXX \$out"
     rspfile = "\$out.rsp"
     rspfile_content = "\$defines \$includes \$cflags \$cflags_cc"
     depsformat = "msvc"
   }
   tool("rc") {
     command = "$python_path gyp-win-tool rc-wrapper environment.x86 rc.exe \$defines \$includes \$rcflags /fo\$out \$in"
     description = "RC \$in"
   }
   tool("asm") {
@@ skipping 29 matching lines @@
   }
 }
 
 # 64-bit toolchain -------------------------------------------------------------
 
 toolchain("64") {
   # Make these apply to all tools below.
   lib_prefix = ""
   lib_dir_prefix="/LIBPATH:"
 
-  cc_command = "ninja -t msvc -e environment.x64 -- cl.exe /nologo /showIncludes /FC @\$out.rsp /c \$in /Fo\$out /Fd\$pdbname"
+  cc_command = "ninja -t msvc -e environment.x64 -- cl.exe /nologo /showIncludes /FC @\$out.rsp /c \$in /Fo\$out"
   tool("cc") {
-    command = cc_command
+    command = cc_command + c_pdb_suffix
     description = "CC \$out"
     rspfile = "\$out.rsp"
     rspfile_content = "\$defines \$includes \$cflags \$cflags_c"
     depsformat = "msvc"
   }
   tool("cxx") {
-    command = cc_command  # Same as above
+    command = cc_command + cc_pdb_suffix
     description = "CXX \$out"
     rspfile = "\$out.rsp"
     rspfile_content = "\$defines \$includes \$cflags \$cflags_cc"
     depsformat = "msvc"
   }
   tool("rc") {
     command = "$python_path gyp-win-tool rc-wrapper environment.x64 rc.exe \$defines \$includes \$rcflags /fo\$out \$in"
     description = "RC \$in"
   }
   tool("asm") {
@@ skipping 30 matching lines @@
 
   # When invoking this toolchain not as the default one, these args will be
   # passed to the build. They are ignored when this is the default toolchain.
   toolchain_args() {
     cpu_arch = "x64"
     # Normally the build config resets the CPU architecture to 32-bits. Setting
     # this flag overrides that behavior.
     force_win64 = true
   }
 }