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CMake: Make symbol versioning configurable.

This commit is contained in:
Lasse Collin 2024-03-13 20:32:46 +02:00
parent 45d33bfc45
commit 82f0c0d39e
1 changed files with 42 additions and 20 deletions
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62
CMakeLists.txt
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@ -333,6 +333,46 @@ endif()
option(BUILD_SHARED_LIBS "Build liblzma as a shared library instead of static")
if(NOT WIN32)
# Symbol versioning only affects ELF shared libraries. The option is
# ignored for static libraries.
#
# Determine the default value so that it's always set with
# shared libraries in mind which helps if the build dir is reconfigured
# from static to shared libs without resetting the cache variables.
set(SYMBOL_VERSIONING_DEFAULT OFF)
if(CMAKE_SYSTEM_NAME STREQUAL "Linux" AND
CMAKE_SYSTEM_PROCESSOR MATCHES "[Mm]icro[Bb]laze")
# As a special case, GNU/Linux on MicroBlaze gets the generic
# symbol versioning because GCC 12 doesn't support the __symver__
# attribute on MicroBlaze. On Linux, CMAKE_SYSTEM_PROCESSOR comes
# from "uname -m" for native builds (should be "microblaze") or from
# the CMake toolchain file (not perfectly standardized but it very
# likely has "microblaze" in lower case or mixed case somewhere in
# the string).
set(SYMBOL_VERSIONING_DEFAULT "generic")
elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
# GNU/Linux-specific symbol versioning for shared liblzma.
# This includes a few extra compatibility symbols for RHEL/CentOS 7
# which are pointless on non-glibc non-Linux systems.
#
# FIXME? Avoid symvers on Linux with non-glibc like musl?
set(SYMBOL_VERSIONING_DEFAULT "linux")
elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
set(SYMBOL_VERSIONING_DEFAULT "generic")
endif()
set(SYMBOL_VERSIONING "${SYMBOL_VERSIONING_DEFAULT}" CACHE STRING
"Enable ELF shared library symbol versioning (OFF, generic, linux)")
# Show a dropdown menu in CMake GUI:
set_property(CACHE SYMBOL_VERSIONING PROPERTY STRINGS "OFF;generic;linux")
endif()
add_library(liblzma
src/common/mythread.h
src/common/sysdefs.h
@ -1276,22 +1316,7 @@ if(WIN32)
# Disable __declspec(dllimport) when linking against static liblzma.
target_compile_definitions(liblzma INTERFACE LZMA_API_STATIC)
endif()
elseif(BUILD_SHARED_LIBS AND CMAKE_SYSTEM_NAME STREQUAL "Linux" AND
NOT CMAKE_SYSTEM_PROCESSOR MATCHES "[Mm]icro[Bb]laze")
# GNU/Linux-specific symbol versioning for shared liblzma.
# This includes a few extra compatibility symbols for RHEL/CentOS 7
# which are pointless on non-glibc non-Linux systems.
#
# As a special case, GNU/Linux on MicroBlaze gets the generic
# symbol versioning because GCC 12 doesn't support the __symver__
# attribute on MicroBlaze. On Linux, CMAKE_SYSTEM_PROCESSOR comes
# from "uname -m" for native builds (should be "microblaze") or from
# the CMake toolchain file (not perfectly standardized but it very
# likely has "microblaze" in lower case or mixed case somewhere in
# the string).
#
# FIXME? Avoid symvers on Linux with non-glibc like musl?
#
elseif(BUILD_SHARED_LIBS AND SYMBOL_VERSIONING STREQUAL "linux")
# Note that adding link options doesn't affect static builds
# but HAVE_SYMBOL_VERSIONS_LINUX must not be used with static builds
# because it would put symbol versions into the static library which
@ -1307,10 +1332,7 @@ elseif(BUILD_SHARED_LIBS AND CMAKE_SYSTEM_NAME STREQUAL "Linux" AND
set_target_properties(liblzma PROPERTIES
LINK_DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/src/liblzma/liblzma_linux.map"
)
elseif(BUILD_SHARED_LIBS AND (CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" OR
CMAKE_SYSTEM_NAME STREQUAL "Linux"))
# Generic symbol versioning for shared liblzma is used on FreeBSD and
# also on GNU/Linux on MicroBlaze.
elseif(BUILD_SHARED_LIBS AND SYMBOL_VERSIONING STREQUAL "generic")
target_link_options(liblzma PRIVATE
"-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/src/liblzma/liblzma_generic.map"
)