[cmake-developers] [CMake 0015156]: Sometime, CMake can't find clang/clang++

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://public.kitware.com/Bug/view.php?id=15156 
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Reported By:                Meng-Yuan Huang
Assigned To:                
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Project:                    CMake
Issue ID:                   15156
Category:                   CMake
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
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Date Submitted:             2014-09-14 08:33 EDT
Last Modified:              2014-09-14 08:33 EDT
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Summary:                    Sometime, CMake can't find clang/clang++
Description: 
I have a CMake C++ project, test. I want to build it by clang/clang++ on CentOS
6.5. I run cmake by this command line:
cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ .

Unfortunately, sometime, cmake said it can't find clang/clang++.
Strangely, if I run the command line again, it becomes to able to find them.
Strangely again, if run the command line again, it becomes to not able to find
them.
...

If cmake can find clang/clang++, then running make will invoke clang/clang++.
Otherwise, if cmake can't find clang/clang++, then running make will invoke
gcc/g++.

I recorded a video to show the problem:
http://1drv.ms/1uwXVek

Please fix this problem.

CMake 3.0.2 also has a similar but different problem as 2.8.12.

Steps to Reproduce: 
1. Download the attached test project, test.tar.gz and extract it.
2. Run cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ .
for several times and inspect the cmake output messages.
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Issue History 
Date Modified    Username       Field                    Change               
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2014-09-14 08:33 Meng-Yuan HuangNew Issue                                    
2014-09-14 08:33 Meng-Yuan HuangFile Added: test.tar.gz                      
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