[llvm] r282704 - [modules] Centralize the module cache.

[Adrian Prantl via llvm-commits]

Nice! Which build configuration were you using? I've never seen this fail with cmake+ninja, which seems to not change directories while building.

-- adrian
> On Sep 29, 2016, at 1:14 AM, Vassil Vassilev via llvm-commits <llvm-commits at lists.llvm.org> wrote:
> 
> Author: vvassilev
> Date: Thu Sep 29 03:14:06 2016
> New Revision: 282704
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=282704&view=rev
> Log:
> [modules] Centralize the module cache.
> 
> This reduces the build size from 17G to 1.9G on my machine.
> 
> 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=282704&r1=282703&r2=282704&view=diff
> ==============================================================================
> --- llvm/trunk/cmake/modules/HandleLLVMOptions.cmake (original)
> +++ llvm/trunk/cmake/modules/HandleLLVMOptions.cmake Thu Sep 29 03:14:06 2016
> @@ -475,7 +475,7 @@ elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE
>   endif()
>   if (LLVM_ENABLE_MODULES)
>     set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
> -    set(module_flags "-fmodules -fmodules-cache-path=module.cache")
> +    set(module_flags "-fmodules -fmodules-cache-path=${PROJECT_BINARY_DIR}/module.cache")
>     if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
>       # On Darwin -fmodules does not imply -fcxx-modules.
>       set(module_flags "${module_flags} -fcxx-modules")
> 
> 
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