option(BUILD_SHARED_LIBS "Build liblzma as a shared library instead of static")
+# Symbol versioning is supported ELF shared libraries on certain OSes.
+# First assume that symbol versioning isn't supported.
+set(SYMBOL_VERSIONING "no")
+
if(NOT WIN32)
- # Symbol versioning only affects ELF shared libraries. The option is
- # ignored for static libraries.
+ # The XZ_SYMBOL_VERSIONING option is ignored for static libraries but
+ # we keep the option visible still in case the project is reconfigured
+ # to build a shared library.
#
- # 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" OR
- CMAKE_C_COMPILER_ID STREQUAL "NVHPC"))
- # 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).
- #
- # NVIDIA HPC Compiler doesn't support symbol versioning but
- # it uses the linked from the system so the linker script
- # can still be used to get the generic symbol versioning.
- 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.
+ # auto Autodetect between no, generic, and linux
+ # yes Force on by autodetecting between linux and generic
+ # no Disable symbol versioning
+ # generic FreeBSD, most Linux/glibc systems, and GNU/Hurd
+ # linux Linux/glibc with extra symbol versions for compatibility
+ # with binaries that have been linked against a liblzma version
+ # that has been patched with "xz-5.2.2-compat-libs.patch" from
+ # RHEL/CentOS 7.
+ set(SUPPORTED_SYMBOL_VERSIONING_VARIANTS auto yes no generic linux)
+ set(XZ_SYMBOL_VERSIONING "auto" CACHE STRING "Enable ELF shared library \
+symbol versioning (${SUPPORTED_SYMBOL_VERSIONING_VARIANTS})")
+
+ # Show a dropdown menu in CMake GUI:
+ set_property(CACHE XZ_SYMBOL_VERSIONING
+ PROPERTY STRINGS "${SUPPORTED_SYMBOL_VERSIONING_VARIANTS}")
+
+ if(NOT XZ_SYMBOL_VERSIONING IN_LIST SUPPORTED_SYMBOL_VERSIONING_VARIANTS)
+ message(FATAL_ERROR "'${XZ_SYMBOL_VERSIONING}' is not a supported "
+ "symbol versioning variant")
+ endif()
+
+ if(NOT XZ_SYMBOL_VERSIONING STREQUAL "auto" AND
+ NOT XZ_SYMBOL_VERSIONING STREQUAL "yes")
+ # Autodetection was disabled. Use the user-specified value as is.
+ set(SYMBOL_VERSIONING "${XZ_SYMBOL_VERSIONING}")
+ else()
+ # Autodetect the symbol versioning variant.
#
# Avoid symvers on Linux with non-glibc like musl and uClibc.
# In Autoconf it's enough to check that $host_os equals linux-gnu
#
# This check is here for now since it's not strictly required
# by anything else.
- check_c_source_compiles(
- "#include <features.h>
- #if defined(__GLIBC__) && !defined(__UCLIBC__)
- int main(void) { return 0; }
- #else
- compile error
- #endif
- "
- IS_LINUX_WITH_GLIBC)
-
- if(IS_LINUX_WITH_GLIBC)
- set(SYMBOL_VERSIONING_DEFAULT "linux")
+ if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+ check_c_source_compiles(
+ "#include <features.h>
+ #if defined(__GLIBC__) && !defined(__UCLIBC__)
+ int main(void) { return 0; }
+ #else
+ compile error
+ #endif
+ "
+ IS_LINUX_WITH_GLIBC)
+ else()
+ set(IS_LINUX_WITH_GLIBC OFF)
endif()
- elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
- set(SYMBOL_VERSIONING_DEFAULT "generic")
+ if(IS_LINUX_WITH_GLIBC AND
+ (CMAKE_SYSTEM_PROCESSOR MATCHES "[Mm]icro[Bb]laze" OR
+ CMAKE_C_COMPILER_ID STREQUAL "NVHPC"))
+ # As a special case, GNU/Linux on MicroBlaze gets the generic
+ # symbol versioning because GCC 12 doesn't support the __symver__
+ # attribute on MicroBlaze. On Linux, CMAKE_SYSTEM_PROCESSOR comes
+ # from "uname -m" for native builds (should be "microblaze") or
+ # from the CMake toolchain file (not perfectly standardized but
+ # it very likely has "microblaze" in lower case or mixed case
+ # somewhere in the string).
+ #
+ # NVIDIA HPC Compiler doesn't support symbol versioning but
+ # it uses the linked from the system so the linker script
+ # can still be used to get the generic symbol versioning.
+ set(SYMBOL_VERSIONING "generic")
+
+ elseif(IS_LINUX_WITH_GLIBC)
+ # GNU/Linux-specific symbol versioning for shared liblzma. This
+ # includes a few extra compatibility symbols for RHEL/CentOS 7
+ # which are pointless on non-glibc non-Linux systems.
+ set(SYMBOL_VERSIONING "linux")
+
+ elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" OR
+ CMAKE_SYSTEM_NAME STREQUAL "GNU" OR
+ XZ_SYMBOL_VERSIONING STREQUAL "yes")
+ set(SYMBOL_VERSIONING "generic")
+ endif()
endif()
-
- set(XZ_SYMBOL_VERSIONING "${SYMBOL_VERSIONING_DEFAULT}" CACHE STRING
- "Enable ELF shared library symbol versioning (OFF, generic, linux)")
-
- # Show a dropdown menu in CMake GUI:
- set_property(CACHE XZ_SYMBOL_VERSIONING
- PROPERTY STRINGS "OFF;generic;linux")
endif()
set(LIBLZMA_API_HEADERS
# Disable __declspec(dllimport) when linking against static liblzma.
target_compile_definitions(liblzma INTERFACE LZMA_API_STATIC)
endif()
-elseif(BUILD_SHARED_LIBS AND XZ_SYMBOL_VERSIONING STREQUAL "linux")
+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
set_target_properties(liblzma PROPERTIES
LINK_DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/src/liblzma/liblzma_linux.map"
)
-elseif(BUILD_SHARED_LIBS AND XZ_SYMBOL_VERSIONING STREQUAL "generic")
+elseif(BUILD_SHARED_LIBS AND SYMBOL_VERSIONING STREQUAL "generic")
target_link_options(liblzma PRIVATE
"-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/src/liblzma/liblzma_generic.map"
)
projects / thirdparty / xz.git / commitdiff
