[CMake] 2.8.11: CMAKE_COMPILER_IS_GNUCC AND CMAKE_COMPILER_IS_GNUCXX Value Changed

[Giordano Khouri]

Looking at the source code, a check is first made for __clang__ and sets CMAKE_<LANG>_COMPILER_ID to "Clang". If you are using CMake 2.8.12, you can even get "AppleClang" to further differentiate it. Since you are using clang, this is correct. This is the variable you should be looking at. Since so many flavors of compilers are based on or compatible with gcc, the test for __GNUC__ comes after testing for all of the others. CMAKE_COMPILER_IS_GNUCC is only set for this last case.





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Khouri Giordano
Software Technology Researcher

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From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On Behalf Of vv zhao
Sent: Wednesday, October 16, 2013 2:46 AM
To: cmake at cmake.org
Subject: [CMake] 2.8.11: CMAKE_COMPILER_IS_GNUCC AND CMAKE_COMPILER_IS_GNUCXX Value Changed


Hi Guys,

I'm v.v., a developer using cmake to generate our project,

Recently we updated our cmake from 2.8.8 to 2.8.11 on Mac, immediately I found a difference between the latest and previous version,

I see CMAKE_COMPILER_IS_GNUCC AND CMAKE_COMPILER_IS_GNUCXX is changed from true to false, but I didn't change my compiler at all, I am using XCode4.5 and select com.apple.compilers.llvm.clang.1_0 as CMAKE_XCODE_ATTRIBUTE_GCC_VERSION in toolchain file,

So my question here is: Is this a correct behaviour for latest 2.8.11 that CMAKE_COMPILER_IS_GNUCC AND CMAKE_COMPILER_IS_GNUCXX is false?

BTW, I read all of documents from 2.8.8 to 2.8.11 about this variable, but seems no explicit description about this change,

Do you have any ideas?

Thanks in advance!

V.V.



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