[CMake] Append to property COMPILE_DEFINITIONS

[Petr Kmoch]

On 24 July 2017 at 04:32, Florian Lindner <mailinglists at xgm.de> wrote:

>
>
> [snip]
>
> Still, I don't undertand what is wrong with:
>
> set_property(GLOBAL APPEND PROPERTY COMPILE_DEFINITIONS
> $<$<CONFIG:Debug>:-FOO>)
>
> ?
>

What's wrong is that there is no such global property. See the list of
global properties:
https://cmake.org/cmake/help/latest/manual/cmake-properties.7.html#properties-of-global-scope

COMPILE_DEFINITIONS is not among them.

You're therefore effectively creating a new user-defined global property,
which of course has no effect on CMake's behaviour.

Petr
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