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Hide non-API functions when position independent code is enabled

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Usage of -fvisibility=hidden is the recommended default for DSO's.

If the spdlog build is for a shared library, then API symbols have
SPDLOG_API marking on them, and cause the symbol to be exported, with
other symbols now hidden by default.

If the build is for a static library with position-independent code, then
spdlog is to be embedded as implementation detail in another shared
library or executable. In that case we don't want to export any symbol.
Conveniently, SPDLPG_API in that case resolves to nothing, so with the
default of hidden all symbols are made hidden.
This commit is contained in:
Uri Simchoni 2023-10-09 22:51:14 +03:00
parent 91807c2e71
commit 894f26bd87
1 changed files with 5 additions and 0 deletions
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5
CMakeLists.txt
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@ -141,6 +141,11 @@ if(SPDLOG_BUILD_PIC)
set(CMAKE_POSITION_INDEPENDENT_CODE ON)
endif()
if((${CMAKE_POSITION_INDEPENDENT_CODE}) OR (${CMAKE_CXX_FLAGS} MATCHES "-fPIC"))
set(CMAKE_CXX_VISIBILITY_PRESET hidden)
set(CMAKE_VISIBILITY_INLINES_HIDDEN ON)
endif()
find_package(Threads REQUIRED)
message(STATUS "Build type: " ${CMAKE_BUILD_TYPE})
# ---------------------------------------------------------------------------------------