[CMake] VS2005: CMAKE_CXX_FLAGS not used when project() is placed after definition

[Rolf Eike Beer]

> Hi,
>
> I encountered a problem with CMAKE_CXX_FLAGS and the place in the
> CMakeLists.txt where the project() command is placed. Consider two
> CMakeLists.txt files, the first containing
> 	SET(CMAKE_CXX_FLAGS "/EHa /O2")
>
> 	project(CMAKE_BUG)
>
> 	add_executable(testEHa "c:/work/tmp/cmake_eha/test.cpp")
>
> And the second containing
>
> 	project(CMAKE_BUG)
>
> 	SET(CMAKE_CXX_FLAGS "/EHa /O2")
>
> 	add_executable(testEHa "c:/work/tmp/cmake_eha/test.cpp")
>
> When I run cmake 2.8.5 on both files, the exception handling option
> differs. For the first file, it is set to 1 in the generated VS project
> file, which means /Ehsc, the default. The second file generates the
> intended project file with windows structured exceptions enabled.
>
> I only checked the generated VS2005 files, so I don't know if this is an
> issue of this specific generator or a more global one.

PROJECT() initializes a bunch of stuff, e.g. it does the compiler
detection and sets the default flags. So what you are seeing is absolutely
expected behaviour.

Eike