[cmake-developers] [CMake 0011629]: CheckCCompilerFlag quirk.
Mantis Bug Tracker
mantis at public.kitware.com
Sun Dec 19 07:41:57 EST 2010
The following issue has been SUBMITTED.
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http://www.cmake.org/Bug/view.php?id=11629
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Reported By: Campbell Barton
Assigned To:
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Project: CMake
Issue ID: 11629
Category: (No Category)
Reproducibility: have not tried
Severity: minor
Priority: normal
Status: new
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Date Submitted: 2010-12-19 07:41 EST
Last Modified: 2010-12-19 07:41 EST
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Summary: CheckCCompilerFlag quirk.
Description:
Hi, we were having some problems with warnings and gcc versions so I
thought to write a macro that adds a flag to any string (typically
CMAKE_C_FLAGS)
ADD_CHECK_C_COMPILER_FLAG(CMAKE_C_FLAGS -Wno-unknown-pragmas)
...this is the macro.
macro(ADD_CHECK_C_COMPILER_FLAG
_CFLAGS
_FLAG)
include(CheckCCompilerFlag)
# odd workaround
set(CFLAG_TEST "CFLAG_TEST")
CHECK_C_COMPILER_FLAG("${_FLAG}" CFLAG_TEST)
if(CFLAG_TEST)
# message(STATUS "Using CFLAG: ${_FLAG}")
set(${_CFLAGS} "${${_CFLAGS}} ${_FLAG}")
else()
message(STATUS "Unsupported CFLAG: ${_FLAG}")
endif()
endmacro()
My question is why this is needed?
set(CFLAG_TEST "CFLAG_TEST")
CHECK_C_COMPILER_FLAG("${_FLAG}" CFLAG_TEST)
If I do this (as I see in other examples online)...
CHECK_C_COMPILER_FLAG("${_FLAG}" CFLAG_TEST)
This if check fails in CheckCSourceCompiles.cmake:28 ...
MACRO(CHECK_C_SOURCE_COMPILES SOURCE VAR)
IF("${VAR}" MATCHES "^${VAR}$")
This is confusing since from what I can tell CFLAG_TEST can be an
undefined variable.
Any idea whats going on?
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Issue History
Date Modified Username Field Change
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2010-12-19 07:41 Campbell BartonNew Issue
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