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0001587

CMake

public

2005-02-09 10:17

2006-10-04 20:21

Reporter

Kris Dekeyser

Assigned To

Bill Hoffman

Priority

normal

Severity

minor

Reproducibility

always

Status

closed

Resolution

won't fix

Platform

OS Version

Product Version

Target Version

Fixed in Version

Summary

0001587: EnableLanguage bug

Description

Dekeyser, Kris wrote:
> However, if we change the BUILD_TYPE in the GUI and reconfigure, the
> CMAKE_CONFIGURATION_TYPES is not overwritten, but appended to. After a
> couple of changes from and to debug and release we end up with
> CMAKE_CONFIGURATION_TYPES="Debug;Release;RelWithDebInfo;MinSizeRel".
[snip]
> I traced this down to the fact that the PROJECT setting is only done in
> the macro, but why is not clear to me. If I include a PROJECT setting
> directly in the CMakeLists.txt everything workes as expected.
>
> WHY ????

The PROJECT command is special in that it internally calls an
"EnableLanguage" method on the generator. This call must be done before
anything can be generated, so there is a check when the top-level
listfile is parsed to make sure it has a PROJECT command. If it does
not, an IMPLICIT project command is automatically added at the top.
Since in your case the project command is hidden inside the macro it is
not found and the implicit project command is invoked first. When it
runs it sees that CMAKE_CONFIGURATION_TYPES is empty so it adds the
default configurations "Debug;Release". Then your project command comes
along and calls the EnableLanguage code again. This code has a bug that
is only exposed in this situation and causes the append behavior.

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