[LLVMdev] CMake, compiler-rt, and MacOS

[Kostya Serebryany]

+samsonov, glider


On Tue, Feb 5, 2013 at 12:16 PM, Chandler Carruth <chandlerc at google.com>wrote:

> On Mon, Feb 4, 2013 at 6:21 AM, Erik Verbruggen <erik.verbruggen at me.com>wrote:
>
>> Hi Chandler,
>>
>> If I remember correctly, you are the de-facto maintainer for the
>> CMake-built-mainainer, so..:
>>
>
> Sure, but I'm often busy. You're better off using the development mailing
> list for questions such as this, and I've moved the conversation there.
>
>
>> I have a problem compiling compiler-rt on MacOS with libc++. For this to
>> work, the flag -mmacosx-version-min=10.7 is required, so I use:
>> CMAKE_CXX_FLAGS:STRING=-mmacosx-version-min=10.7 -stdlib=libc++
>>
>> However, around line 140, the CMakeLists.txt of compiler-rt contains:
>> if(APPLE)
>>   list(APPEND SANITIZER_COMMON_CFLAGS -mmacosx-version-min=10.5)
>> endif()
>>
>> Now, when building with clang, the minimal minimal version is used, so
>> 10.5, which results in a compiler error complaining that the minimal
>> version should be 10.7.
>>
>> My question: could you please add some CMake logic to the compiler-rt
>> CMakeLists.txt to check if there is already a macosx-version-min flag set,
>> or to not include the flag if -stdlib=libc++ is set?
>>
>
> I don't know the specific needs of either libc++ or the sanitizer on mac;
> instead this should be answered by one of the folks actively working on
> that area. There are several on the list that can likely help.
>
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