[PATCH] D61046: Fix compilation warnings when compiling with GCC 7.3

Tom Stellard via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Wed Apr 24 16:06:16 PDT 2019

tstellar added inline comments.

Comment at: llvm/trunk/unittests/Transforms/Scalar/CMakeLists.txt:14-17
+# Workaround for the gcc 6.1 bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80916.
+  set_source_files_properties(LoopPassManagerTest.cpp PROPERTIES COMPILE_FLAGS -Wno-unused-function)
aganea wrote:
> tstellar wrote:
> > aganea wrote:
> > > tstellar wrote:
> > > > Same thing here too.
> > > Not sure I understand, there're plenty of compiler-specific examples in the .cmake files. Is there an alternate way to fix this?
> > I know there are some, but I don't think a warning like this is important enough to fix with a compiler specific work-around.
> You mean more like
> ```
> # Workaround for the gcc 6.1 bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80916.
> if (NOT MSVC)
>   set_source_files_properties(LoopPassManagerTest.cpp PROPERTIES COMPILE_FLAGS -Wno-unused-function)
> endif()
> ```
> Or leave the warning? There's already an #ifdef below in LoopPassManagerTest.cpp but it's not at the right place, this simply corrects it.
Ok, I see in this case you are just moving the ifdef out of the code and into CMake.  I really don't like either approach, but I guess this is fine.  I would limit the work-around to only known broken compilers though.  It looks like this might be fixed in gcc 9.



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