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CMake: Fix linking pthread of CMake < 3.1

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As reported in #1624, Ubuntu 14.04 LTS still uses CMake 2.8.12 which
does not support the Threads::Threads target (added in CMake 3.1).

This could be reverted once the required CMake version is bumped to 3.1+.
This commit is contained in:
Rémi Verschelde 2018-12-18 11:43:09 +01:00
parent 1a19598ef0
commit f0e911c809
1 changed files with 13 additions and 3 deletions
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16
glslang/OSDependent/Unix/CMakeLists.txt
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@ -2,10 +2,20 @@ add_library(OSDependent STATIC ossource.cpp ../osinclude.h)
set_property(TARGET OSDependent PROPERTY FOLDER glslang)
set_property(TARGET OSDependent PROPERTY POSITION_INDEPENDENT_CODE ON)
# Link pthread
set(CMAKE_THREAD_PREFER_PTHREAD ON)
set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads)
target_link_libraries(OSDependent Threads::Threads)
if(${CMAKE_VERSION} VERSION_LESS "3.1.0")
# Needed as long as we support CMake 2.8 for Ubuntu 14.04,
# which does not support the recommended Threads::Threads target.
# https://cmake.org/cmake/help/v2.8.12/cmake.html#module:FindThreads
find_package(Threads)
target_link_libraries(OSDependent ${CMAKE_THREAD_LIBS_INIT})
else()
# This is the recommended way, so we use it for 3.1+.
set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads)
target_link_libraries(OSDependent Threads::Threads)
endif()
if(ENABLE_GLSLANG_INSTALL)
install(TARGETS OSDependent