Alan W. Irwin wrote:
> Hi Hazen:
> 
> This is mostly addressed to you, but there is a question at the end for all
> our developers.
> 
> On 2009-07-23 12:23-0400 Hazen Babcock wrote:
> 
>> [...]I think I managed to figure out a few things. Maybe the problem 
>> is with the cmake command that is used to test the c++ compiler (the 
>> one that is run by language_support.cmake)? If I run the same command 
>> by hand:
>>
>> xx\plplot_build\language_tests\CXX>"c:\Program Files\CMake 
>> 2.6\bin\cmake.exe" .
>>
>> I get:
>>
>> CMake Error: CMake was unable to find a build program corresponding to 
>> "Visual Studio 6". CMAKE_MAKE_PROGRAM is not set. You probably need to 
>> select a different build tool.
>>
>> Anyway, if I simply comment out the workaround_9220 section in 
>> c++.cmake then I can build PLplot with the Qt drivers and (untested) 
>> PyQt4 support so it all looks very promising.
> 
> Thanks for that information which I think contains a strong clue about what
> is happening.  workaround_9220 does a small test run of the cmake 
> command to
> check the language support.  But when executing that test run, it just
> invoked cmake with no generator specified.  That default won't work if an
> overall generator is specified (which I assume it true in your case).  To
> fix this I propagated the overall generator to the test run (revision
> 10176).
> 
> Please give that a try.

It works now, thanks!

> Note, there are quite a few ways within CMake to choose a compiler such as
> specifying CMAKE_<lang>_COMPILER or CMAKE_<lang>_COMPILER_INIT.  There are
> also a large plethora of ways to specify options for any given compiler.
> workaround_9220 ignores all of that because I think it is too 
> complicated to
> propagate all the possibilities while still insuring a reliable result.
> workaround_9220 should work fine if you use the default compiler for your
> generator or if you have specified the compiler (and flags) with the
> appropriate environment variable, e.g.,
> 
> export CXX="g++ -g -fvisibility=hidden"
> 
> since the environment variable should just propagate to the test cmake run.
> 
> I am inclined to simply say in the release notes that until CMake bug 9220
> is fixed, we do not support any methods of specifying the compiler for the
> soft landing logic other than using the appropriate environment 
> variable.

Sounds reasonable to me. I almost never specify the compiler anyway and 
simply rely on cmake to pick up the right compiler.

-Hazen

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