On 08/03/2018 07:12 PM, Simon Richter wrote:
> string(APPEND CMAKE_CXX_FLAGS
> "$<IF:$<SOURCE_PROPERTY:GENERATED>,${WARN_SHADOW_OFF},${WARN_SHADOW_ON}> ")
The generators put the project-/target-wide flags in a place that
does not depend on the source being compiled so there would be no
way to evaluate that. On some generators per-source flags produce
a huge slowdown in the build (e.g. VS) so splitting up the settings
for every source is not practical.
We already run into this in the COMPILE_LANGUAGE generator expression:
https://cmake.org/cmake/help/v3.12/manual/cmake-generator-expressions.7.html
See the note there about how it is handled on VS and Xcode.
> The only way I can think of doing this would be to remove the global
> warning flag definitions from the toplevel CMakeLists.txt
Per-source flags are placed after the target-wide flags on the command
line so you could just keep -Wshadow by default and then add -Wno-shadow
to the COMPILE_FLAGS source file property of the generated sources.
Alternatively you could use an object library for all the generated
sources and then set its target-wide flags to use "-Wno-shadow", or
even "-w".
-Brad
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