MantisBT - CMake

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Date Submitted

Last Update

0015264

CMake

public

2014-11-25 04:22

2015-04-06 09:07

Reporter

Evgeniy Stepanov

Assigned To

Priority

normal

Severity

major

Reproducibility

always

Status

closed

Resolution

duplicate

Platform

x86_64

Linux

OS Version

Product Version

CMake 3.0.2

Target Version

Fixed in Version

Summary

0015264: check_cxx_compiler_flag fails to use linker flags

Description

check_cxx_compiler_flag test compilation AND linking of a test source file, but it fails to use linker flags when doing so.

In certain configurations, custom compiler flags used by the project require custom linker flags. For example, if I've got libc++ in a non-standard location, I would use CMAKE_CXX_FLAGS=-stdlib=libc++ CMAKE_EXE_LINKER_FLAGS=-L/path/to/libc++ CMAKE_MODULE_LINKER_FLAGS=-L/path/to/libc++ CMAKE_SHARED_LINKER_FLAGS=-L/path/to/libc++.

In this situation, check_cxx_compiler_flag uses compiler flags, but not linker flags, which fails linking if there is no system-wide installation of libc++.

See also: http://llvm.org/bugs/show_bug.cgi?id=19071 [^]

Note that there is a similar problem with the compiler test ("Check for working CXX compiler"). It uses CMAKE_CXX_FLAGS and env['LDFLAGS']. It does not use any of CMAKE_*_LINKER_FLAGS or env['CXXFLAGS']. It does not make any sense to me. Let me know if I should file it as a separate issue.

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