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Avoid unnecessary symbol exposure with ELF-based systems

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GCC's default visibility is "public" but can be changed to
"hidden" with the argument "-fvisibility=hidden".

Tested with x86_64 / Ubuntu Linux 18.04 LTS:

[before]
$ nm -g -C libmimalloc.so | grep "T " | wc -l
142

[after]
$ nm -g -C libmimalloc.so | grep "T " | wc -l
93

This patch does not change the build on macOS.
This commit is contained in:
Jim Huang 2019-06-23 23:04:43 +08:00 • committed by Jim Huang
parent 91cb4cee8a
commit 256eb97849
2 changed files with 10 additions and 1 deletions
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1
CMakeLists.txt
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@ -82,6 +82,7 @@ if(CMAKE_C_COMPILER_ID MATCHES "AppleClang|Clang|GNU")
list(APPEND mi_cflags -Wall -Wextra -Wno-unknown-pragmas -ftls-model=initial-exec)
if(CMAKE_C_COMPILER_ID MATCHES "GNU")
list(APPEND mi_cflags -Wno-invalid-memory-model)
list(APPEND mi_cflags -fvisibility=hidden)
endif()
endif()