[cairo-bugs] [Bug 88050] Compiler warning in cairo-gl.h undefined #if check

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88050

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
This is not a bug, but correct cpp behaviour.

An undefined macro is evaluated as 0.

The preference is to use #if MACRO_NAME rather than #ifdef.

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