[LLVMdev] CMake does not propagate flags to build

[Martin J. O'Riordan]

I regularly use '-DCMAKE_CXX_FLAGS' when configuring CLang/LLVM to distinguish my builds (Alpha/Beta/Final) or to build custom versions, usually by adding additional '-D' flags, but I discovered I had to add the ':STRING' qualifier to it when invoking 'cmake'.  With 'gmake' this is equivalent to '--with-extra-options="whatever flags":

	-DCMAKE_CXX_FLAGS:STRING="whatever flags"

This works regardless of whether it is a Debug or Release build.

All the best,

	MartinO

-----Original Message-----
From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Chris Bieneman
Sent: 20 July 2015 19:23
To: adek at adek.io
Cc: llvmdev at cs.uiuc.edu
Subject: Re: [LLVMdev] CMake does not propagate flags to build

Adrian,

What makes you think CMAKE_CXX_FLAGS isn’t being respected?

The tests will always occur regardless of whether or not you set the CXX_FLAGS explicitly.

-Chris

> On Jul 20, 2015, at 9:36 AM, adek at adek.io wrote:
> 
> 
> Hey Pete,
> 
> I also tried CMAKE_CXX_FLAGS_RELEASE
> with the same effect.
> 
> On Mon, Jul 20, 2015, at 09:34 AM, Pete Cooper wrote:
>> Hi Adrian
>> 
>> I’m not sure if the CMAKE_CXX_FLAGS is used in LLVM.  We have our own 
>> flags for different configurations.  I don’t remember if our ones 
>> inherit from CMAKE_CXX_FLAGS or override it completely.  Anyway, they are:
>> - CMAKE_CXX_FLAGS_DEBUG
>> - CMAKE_CXX_FLAGS_MINSIZEREL
>> - CMAKE_CXX_FLAGS_RELEASE
>> - CMAKE_CXX_FLAGS_RELWITHDEBINFO
>> 
>> The one of those you get depends on what you set CMAKE_BUILD_TYPE to. 
>> Options are ‘Debug, Release, RelWithDebInfo, MinSizeRel’
>> 
>> Cheers,
>> Pete
>>> On Jul 17, 2015, at 8:41 PM, adek at adek.io wrote:
>>> 
>>> '-DCMAKE_CXX_FLAGS=-fno-omit-frame-pointer -Wno-maybe-uninitialized 
>>> -fPIC -fPIE'
>>> -- The C compiler identification is GNU 4.8.1
>>> -- The CXX compiler identification is GNU 4.8.1
>>> -- Check for working C compiler:
>>> /home/engshare/third-party2/gcc/4.8.1/centos6-native/cc6c9dc/bin/gcc
>>> -- Check for working C compiler:
>>> /home/engshare/third-party2/gcc/4.8.1/centos6-native/cc6c9dc/bin/gcc 
>>> -- works
>>> -- Detecting C compiler ABI info
>>> -- Detecting C compiler ABI info - done
>>> -- Detecting C compile features
>>> -- Detecting C compile features - done
>>> -- Check for working CXX compiler:
>>> /home/engshare/third-party2/gcc/4.8.1/centos6-native/cc6c9dc/bin/g++
>>> -- Check for working CXX compiler:
>>> /home/engshare/third-party2/gcc/4.8.1/centos6-native/cc6c9dc/bin/g++ 
>>> -- works
>>> -- Detecting CXX compiler ABI info
>>> -- Detecting CXX compiler ABI info - done
>>> -- Detecting CXX compile features
>>> -- Detecting CXX compile features - done
>>> -- Found PythonInterp:
>>> /home/engshare/third-party2/python/2.7.5/centos6-native/da39a3e/bin/
>>> python2.7
>>> (found version "2.7.5")
>>> -- Looking for unwind.h
>>> -- Looking for unwind.h - found
>>> -- Performing Test COMPILER_RT_HAS_FPIC_FLAG
>>> -- Performing Test COMPILER_RT_HAS_FPIC_FLAG - Success
>>> -- Performing Test COMPILER_RT_HAS_FPIE_FLAG
>>> -- Performing Test COMPILER_RT_HAS_FPIE_FLAG - Success
>>> -- Performing Test COMPILER_RT_HAS_FNO_BUILTIN_FLAG
>>> -- Performing Test COMPILER_RT_HAS_FNO_BUILTIN_FLAG - Success
>>> -- Performing Test COMPILER_RT_HAS_FNO_EXCEPTIONS_FLAG
>>> -- Performing Test COMPILER_RT_HAS_FNO_EXCEPTIONS_FLAG - Success
>>> -- Performing Test COMPILER_RT_HAS_FOMIT_FRAME_POINTER_FLAG
>>> -- Performing Test COMPILER_RT_HAS_FOMIT_FRAME_POINTER_FLAG - 
>>> Success
>>> 
>>> Is it still related to this:
>>> http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-March/071394.html
>>> 
>>> 
>>> Adrian Zgorzałek
>>> 
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>> 
> 
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev


_______________________________________________
LLVM Developers mailing list
LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev