[cmake-developers] [CMake 0015641]: In CMake 3.3.0-rc3 macro CHECK_CXX_COMPILER_FLAG is broken on OSX for some flags

Mantis Bug Tracker mantis at public.kitware.com
Wed Jul 8 09:27:24 EDT 2015


The following issue has been SUBMITTED. 
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https://public.kitware.com/Bug/view.php?id=15641 
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Reported By:                Nikolay Zapolnov
Assigned To:                
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Project:                    CMake
Issue ID:                   15641
Category:                   CMake
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
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Date Submitted:             2015-07-08 09:27 EDT
Last Modified:              2015-07-08 09:27 EDT
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Summary:                    In CMake 3.3.0-rc3 macro CHECK_CXX_COMPILER_FLAG is
broken on OSX for some flags
Description: 
In CMake 3.2.3 the CHECK_CXX_COMPILER_FLAG macro launches compiler and then
linker.
But tested flag is passed *only* to the compiler and test passes.

But in CMake 3.3.0-rc3 argument is passed to *both* the compiler and the linker.
This causes an error for some flags, for example for '-x objective-c++'. Passing
this flag to the linker makes it recognize .o files as objective-c++ sources and
fail.

Steps to Reproduce: 
Use the following CMakeLists.txt

INCLUDE(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("-x objective-c++" HAVE_OBJC)

This will work correctly in CMake 3.2.3 but in CMake 3.3.0-rc3 HAVE_OBJC will be
always false.

Additional Information: 
Part of CMakeOutput.log for good case and part of CMakeError.log for broken case
are attached to the ticket.
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Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2015-07-08 09:27 Nikolay ZapolnovNew Issue                                    
2015-07-08 09:27 Nikolay ZapolnovFile Added: good-cmake322.log                  
 
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