[llvm] r290358 - Pass -Wa,-mbig-obj in 64-bit mingw builds

[Reid Kleckner via llvm-commits]

Author: rnk
Date: Thu Dec 22 13:12:14 2016
New Revision: 290358

URL: http://llvm.org/viewvc/llvm-project?rev=290358&view=rev
Log:
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

Modified:
    llvm/trunk/cmake/modules/HandleLLVMOptions.cmake

Modified: llvm/trunk/cmake/modules/HandleLLVMOptions.cmake
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/cmake/modules/HandleLLVMOptions.cmake?rev=290358&r1=290357&r2=290358&view=diff
==============================================================================
--- llvm/trunk/cmake/modules/HandleLLVMOptions.cmake (original)
+++ llvm/trunk/cmake/modules/HandleLLVMOptions.cmake Thu Dec 22 13:12:14 2016
@@ -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 )