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IDProjectCategoryView StatusDate SubmittedLast Update
0015156CMakeCMakepublic2014-09-14 08:332015-03-02 08:57
ReporterMeng-Yuan Huang 
Assigned To 
PrioritynormalSeverityminorReproducibilityalways
StatusclosedResolutionfixed 
PlatformLinuxOSCentOSOS Version6.5 x64
Product VersionCMake 2.8.12 
Target VersionCMake 3.1Fixed in VersionCMake 3.1 
Summary0015156: Sometime, CMake can't find clang/clang++
DescriptionI 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 Reproduce1. 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.
TagsNo tags attached.
Attached Filesgz file icon test.tar.gz [^] (26,051 bytes) 2014-09-14 08:33

 Relationships

  Notes
(0036793)
Brad King (manager)
2014-09-15 09:47

 Please try either:

 cmake -DCMAKE_C_COMPILER=/full/path/to/bin/clang -DCMAKE_CXX_COMPILER=/full/path/to/bin/clang++ .

or

 CC=clang CXX=clang++ cmake .

in a fresh tree.
(0036794)
Meng-Yuan Huang (reporter)
2014-09-15 09:54

 Hi Brad King,

Thanks. I know using absolute paths to clang and clang++ can work around the problem. However, I want to know whether this problem be fixed.
(0036796)
Brad King (manager)
2014-09-15 10:09

 I think this may have been fixed since 3.0. Please try a version from the Git 'master' branch or a nightly binary:

 http://www.cmake.org/files/dev/?C=M;O=D [^]
(0036798)
Brad King (manager)
2014-09-15 10:11

 Re 0015156:0036796: IIRC, the fix was here:

 cmGlobalGenerator: Do not re-add CMAKE_<LANG>_COMPILER
 http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=731427a6 [^]
(0036811)
Meng-Yuan Huang (reporter)
2014-09-15 20:09

 Hi Brad King,

Thanks.
I confirmed ver. 3.0.20140911-g5cbab solves this problem.
However, ver. 3.0.2 surely has a similar but different problem.
(0036814)
Brad King (manager)
2014-09-16 08:37

 Re 0015156:0036811: Thanks for testing. The fix will be in the 3.1 release. For older versions please use one of the methods suggested in 0015156:0036793.
(0038124)
Robert Maynard (manager)
2015-03-02 08:57

 Closing resolved issues that have not been updated in more than 4 months.

 Issue History
Date Modified Username Field Change
2014-09-14 08:33 Meng-Yuan Huang New Issue
2014-09-14 08:33 Meng-Yuan Huang File Added: test.tar.gz
2014-09-15 09:47 Brad King Note Added: 0036793
2014-09-15 09:54 Meng-Yuan Huang Note Added: 0036794
2014-09-15 10:09 Brad King Note Added: 0036796
2014-09-15 10:11 Brad King Note Added: 0036798
2014-09-15 20:09 Meng-Yuan Huang Note Added: 0036811
2014-09-16 08:37 Brad King Note Added: 0036814
2014-09-16 08:37 Brad King Status new => resolved
2014-09-16 08:37 Brad King Resolution open => fixed
2014-09-16 08:37 Brad King Fixed in Version => CMake 3.1
2014-09-16 08:37 Brad King Target Version => CMake 3.1
2015-03-02 08:57 Robert Maynard Note Added: 0038124
2015-03-02 08:57 Robert Maynard Status resolved => closed

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