BUILD(cmake): Use external module for compiler flags #5960
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The macOS build failure is due to protocolbuffers/protobuf#9181, which should be resolved in protobuf v3.20 (or later). However, our 1.5 build env currently uses Protobuf v3.19 and therefore the build on macOS currently fails. |
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We use our own fork in order to be able to mark included files as system files to avoid warnings from them.
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Using a separate module instead of encoding the different flags for different compilers into our own cmake source code should clean things up a bit and make the intention more clear (as the flags sometimes have rather cryptic names). This commit also contains a functional change in that it removes the "fast-math" compile option (from optimized builds) as this is incompatible with at least Opus.
This eradicates some platform differences Fixes mumble-voip#3845
The way this union was accessed is not covered by the C++ standard and was therefore undefined behavior. Therefore, the code was rewritten to stick to standard C++.
The migration path was implemented in 0e17c53 but the QUuid object created for the GKey keyboard shortcuts had an error in the constructor arguments (wrong pairing of bytes) which would lead to some bytes being discarded and thus to a different (invalid) QUuid. This has been fixed.
In various places we relied on compiler extensions such as variable-length arrays on the stack or using non-standard escape sequences. In order to make our code as portable as possible, these parts of the code have been refactored to only use standard C++. Furthermore, the new warning settings triggered a bunch of new warnings all over the place that have been addressed by this commit.
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Instead of relying on explicitly having to use the "Release" target, we now enable LTO for everything but the special "Debug" target. That is, we assume that every configuration other than "Debug" is likely meant as some sort of release build (potentially with external flags) and thus we want to make use of LTO.
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Now that mumble-voip/mumble#5960 has been merged, building on ARM should no longer suffer from failing test cases and thus the corresponding images can now be enabled here. See also mumble-voip#3
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This PR also introduces new flags to ensure that the
chartype is always signed (Fixes #3845)Furthermore, this also increases the default warning levels, which is why it also includes several commits to fix the new warnings.
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