From: Reid Kleckner <rnk@google.com>
Date: Thu, 22 Dec 2016 19:12:14 +0000 (+0000)
Subject: Pass -Wa,-mbig-obj in 64-bit mingw builds
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e1c9f504c6810be782714b8b39f11579e50fa5c7;p=llvm

Pass -Wa,-mbig-obj in 64-bit mingw builds

COFF has a 2**16 section limit, and on Win64, every COMDAT function
creates at least 3 sections: .text, .pdata, and .xdata. For MSVC, we
enable bigobj on a file-by-file basis, but GCC appears to hit the limit
on different files.

Fixes PR25953

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290358 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/cmake/modules/HandleLLVMOptions.cmake b/cmake/modules/HandleLLVMOptions.cmake
index 964fa59c0ba..133e8ef3d8a 100644
--- a/cmake/modules/HandleLLVMOptions.cmake
+++ b/cmake/modules/HandleLLVMOptions.cmake
@@ -232,6 +232,13 @@ if(MSVC)
   set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /STACK:10000000")
 elseif(MINGW) # FIXME: Also cygwin?
   set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--stack,16777216")
+
+  # Pass -mbig-obj to mingw gas on Win64. COFF has a 2**16 section limit, and
+  # on Win64, every COMDAT function creates at least 3 sections: .text, .pdata,
+  # and .xdata.
+  if (CMAKE_SIZEOF_VOID_P EQUAL 8)
+    append("-Wa,-mbig-obj" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+  endif()
 endif()
 
 if( MSVC )