CMakeLists: add BUILD_{SHARED,STATIC}_LIBS options

Add BUILD_SHARED_LIBS and BUILD_STATIC_LIBS options to allow the user
to enable/disable building of shared and static library

This is especially useful when cross-compiling as some toolchains are
not always able to build a shared or a static library

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>

CMakeLists.txt

@@ -12,6 +12,8 @@ include(CMakePackageConfigHelpers)
 enable_testing()
 
 option(GLM_QUIET "No CMake Message" OFF)
+option(BUILD_SHARED_LIBS "Build shared library" ON)
+option(BUILD_STATIC_LIBS "Build static library" ON)
 option(GLM_TEST_ENABLE_CXX_98 "Enable C++ 98" OFF)
 option(GLM_TEST_ENABLE_CXX_11 "Enable C++ 11" OFF)
 option(GLM_TEST_ENABLE_CXX_14 "Enable C++ 14" OFF)

glm/CMakeLists.txt

@@ -44,6 +44,7 @@ source_group("SIMD Files" FILES ${SIMD_HEADER})
 
 include_directories(${CMAKE_CURRENT_SOURCE_DIR}/..)
 
+if(BUILD_STATIC_LIBS)
 add_library(glm_static STATIC ${ROOT_TEXT} ${ROOT_MD} ${ROOT_NAT}
 	${ROOT_SOURCE}    ${ROOT_INLINE}    ${ROOT_HEADER}
 	${CORE_SOURCE}    ${CORE_INLINE}    ${CORE_HEADER}
@@ -51,7 +52,9 @@ add_library(glm_static STATIC ${ROOT_TEXT} ${ROOT_MD} ${ROOT_NAT}
 	${GTC_SOURCE}     ${GTC_INLINE}     ${GTC_HEADER}
 	${GTX_SOURCE}     ${GTX_INLINE}     ${GTX_HEADER}
 	${SIMD_SOURCE}    ${SIMD_INLINE}    ${SIMD_HEADER})
+endif()
 
+if(BUILD_SHARED_LIBS)
 add_library(glm_shared SHARED ${ROOT_TEXT} ${ROOT_MD} ${ROOT_NAT}
 	${ROOT_SOURCE}    ${ROOT_INLINE}    ${ROOT_HEADER}
 	${CORE_SOURCE}    ${CORE_INLINE}    ${CORE_HEADER}
@@ -59,4 +62,5 @@ add_library(glm_shared SHARED ${ROOT_TEXT} ${ROOT_MD} ${ROOT_NAT}
 	${GTC_SOURCE}     ${GTC_INLINE}     ${GTC_HEADER}
 	${GTX_SOURCE}     ${GTX_INLINE}     ${GTX_HEADER}
 	${SIMD_SOURCE}    ${SIMD_INLINE}    ${SIMD_HEADER})
+endif()