The following issue has been SUBMITTED. 
====================================================================== 
http://public.kitware.com/Bug/view.php?id=12576 
====================================================================== 
Reported By:                Hans Johnson
Assigned To:                
====================================================================== 
Project:                    CMake
Issue ID:                   12576
Category:                   Modules
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
====================================================================== 
Date Submitted:             2011-11-12 09:19 EST
Last Modified:              2011-11-12 09:19 EST
====================================================================== 
Summary:                    CHECK_C_COMPILER_FLAG is inflexible for FAIL_REGEX
Description: 
The end user that wants to use a new compiler has no way to add a new FAIL_REGEX
option to the 
CHECK_C_COMPILER_FLAG macro.

In ITK we created a custom ITK_CHECK_C_COMPILER_FLAG that adds only one line in
order to properly handle the intel compiler.

It would be very nice if this macro were refactored so that one could append new
FAIL_REGEX strings from end-user build environments without the need to copy and
alter this macro set.

Hans


Steps to Reproduce: 
        MACRO (ITK_CHECK_C_COMPILER_FLAG _FLAG _RESULT)
26         SET(SAFE_CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS}")
27         SET(CMAKE_REQUIRED_DEFINITIONS "${_FLAG}")
28         CHECK_C_SOURCE_COMPILES("int main(void) { return 0; }" ${_RESULT}
29           # Some compilers do not fail with a bad flag
30           FAIL_REGEX "warning: command line option .* is valid for .* but 
not for
C"
31                                                                  # Apple gcc
32           FAIL_REGEX "unrecognized .*option"                     # GNU
33           FAIL_REGEX "unknown .*option"                          # Clang
34           FAIL_REGEX "ignoring unknown option"                   # MSVC
35           FAIL_REGEX "warning D9002"                             # MSVC, any 
lang
36           FAIL_REGEX "[Uu]nknown option"                         # HP
37           FAIL_REGEX "[Ww]arning: [Oo]ption"                     # SunPro
38           FAIL_REGEX "command option .* is not recognized"       # XL
39           FAIL_REGEX "warning 
http://public.kitware.com/Bug/view.php?id=10156:
ignoring option"       # INTEL compilers
40           )
====================================================================== 

Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2011-11-12 09:19 Hans Johnson   New Issue                                    
======================================================================

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