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Respect CMAKE_EXE_LINKER_FLAGS/CMAKE_SHARED_LINKER_FLAGS flags set via CLI #830
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…a CLI In case of Clang, we were always overriding the above mentioned flags and hence cmake args were ignored (resuliting in link errors)
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olupton
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Jun 22, 2022
| @@ -113,8 +113,8 @@ foreach(COMPILER_LANGUAGE ${SUPPORTED_COMPILER_LANGUAGE_LIST}) | |||
| # Force same ld behavior as when called from gcc --as-needed forces the linker to check whether | |||
| # a dynamic library mentioned in the command line is actually needed by the objects being | |||
| # linked. Symbols needed in shared objects are already linked when building that library. | |||
| set(CMAKE_EXE_LINKER_FLAGS "-Wl,--as-needed") | |||
| set(CMAKE_SHARED_LINKER_FLAGS "-Wl,--as-needed") | |||
| set(CMAKE_EXE_LINKER_FLAGS "-Wl,--as-needed ${CMAKE_EXE_LINKER_FLAGS}") | |||
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You can use https://cmake.org/cmake/help/latest/command/string.html#append to avoid repeating the variable name, I think, but no big deal.
| -I$(CORENRN_INC_DIR) $(INCFLAGS) \ | ||
| -L$(OUTPUT_DIR) -l$(COREMECH_LIB_NAME) $(CORENRNLIB_FLAGS) $(LDFLAGS) \ | ||
| -L$(OUTPUT_DIR) -l$(COREMECH_LIB_NAME) $(CORENRNLIB_FLAGS) $(LDFLAGS) $(CXX_LINK_EXE_FLAGS) \ |
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As far as I can see the changes to this file just re-order some flags. Is that important?
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I now see the commit message about it needing to be later. Can you add a comment/documentation about that issue/detail?
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yeah, I should have put this PR in draft - haven't thoroughly checked how/why -Wl,--as-needed causes this but I remember this flag was needed in case wheel building. I will check this bit later and get back here.
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Description
In the case of Clang, we were always overriding the above-mentioned flags
and hence cmake args were ignored (resulting in link errors)
How to test this?
On BB5 with Clang compiler
Test System
BB5