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+.
Would typically be pthreads.
Without this, '-Wl,--no-undefined' would output these errors:
/usr/bin/ld: OSDependent/Unix/libOSDependent.a(ossource.cpp.o): in function `glslang::OS_CleanupThreadData()':
/home/akien/Mageia/Sandbox/_rpm/BUILD/glslang-7.10.2984/glslang/OSDependent/Unix/ossource.cpp:83: undefined reference to `__pthread_register_cancel'
/usr/bin/ld: /home/akien/Mageia/Sandbox/_rpm/BUILD/glslang-7.10.2984/glslang/OSDependent/Unix/ossource.cpp:93: undefined reference to `__pthread_unregister_cancel'
/usr/bin/ld: OSDependent/Unix/libOSDependent.a(ossource.cpp.o): in function `glslang::OS_AllocTLSIndex()':
/home/akien/Mageia/Sandbox/_rpm/BUILD/glslang-7.10.2984/glslang/OSDependent/Unix/ossource.cpp:122: undefined reference to `pthread_key_create'
/usr/bin/ld: OSDependent/Unix/libOSDependent.a(ossource.cpp.o): in function `glslang::OS_SetTLSValue(void*, void*)':
/home/akien/Mageia/Sandbox/_rpm/BUILD/glslang-7.10.2984/glslang/OSDependent/Unix/ossource.cpp:137: undefined reference to `pthread_setspecific'
/usr/bin/ld: OSDependent/Unix/libOSDependent.a(ossource.cpp.o): in function `glslang::OS_FreeTLSIndex(void*)':
/home/akien/Mageia/Sandbox/_rpm/BUILD/glslang-7.10.2984/glslang/OSDependent/Unix/ossource.cpp:162: undefined reference to `pthread_key_delete'
/usr/bin/ld: OSDependent/Unix/libOSDependent.a(ossource.cpp.o): in function `glslang::InitGlobalLock()':
/home/akien/Mageia/Sandbox/_rpm/BUILD/glslang-7.10.2984/glslang/OSDependent/Unix/ossource.cpp:175: undefined reference to `pthread_mutexattr_init'
/usr/bin/ld: /home/akien/Mageia/Sandbox/_rpm/BUILD/glslang-7.10.2984/glslang/OSDependent/Unix/ossource.cpp:176: undefined reference to `pthread_mutexattr_settype'
/usr/bin/ld: OSDependent/Unix/libOSDependent.a(ossource.cpp.o): in function `glslang::OS_GetTLSValue(void*)':
/home/akien/Mageia/Sandbox/_rpm/BUILD/glslang-7.10.2984/glslang/OSDependent/Unix/ossource.cpp:149: undefined reference to `pthread_getspecific'
This reverts commit cfc69d95afed34e1ba1371df0ddb56f2f491a5cb.
* Change CMAKE_INSTALL_PREFIX default on Windows in order
to prevent permission denied errors when trying to install
to "Program Files".
* Use `GNUInstallDirs` in order to respect GNU conventions.
This is especially important for multi-arch/multi-lib setups.
* Specify position independent mode building properly, without
using the historic hack of adding `-fPIC` as a definition.
This makes the build system more portable.
* Only detect C++ (and not C) to slightly speed up configuring.
* Specify C++11 mode using modern CMake idioms.
* Fix some whitespace issues.
This adds solution folders that properly group gtest/glslang/hlsl.
This also marks gtest options as advanced so they don't show up
in cmake-gui by default.
* Linux folder has been renamed to Unix, to match defines and so that it
compiles on OS X.
* This removes the need for a per-platform include search path for the
right OS folder
