cmake: only install public headers

Only the headers that are part of glslang's public interface are
installed. Previously, all of its headers were installed, which exposed
a lot of internal implementation details and made it difficult to
maintain backward compatiblity. This reduces the API surface somewhat
and will make it easier to maintain API and ABI compatibility.

SPIRV/CMakeLists.txt

@@ -70,6 +70,13 @@ set(SPVREMAP_HEADERS
     SPVRemapper.h
     doc.h)
 
+set(PUBLIC_HEADERS
+    GlslangToSpv.h
+    disassemble.h
+    Logger.h
+    spirv.hpp
+    SPVRemapper.h)
+
 add_library(SPIRV ${LIB_TYPE} ${SOURCES} ${HEADERS})
 set_target_properties(SPIRV PROPERTIES
     FOLDER glslang
@@ -148,5 +155,5 @@ if(ENABLE_GLSLANG_INSTALL)
     ")
     install(FILES "${CMAKE_CURRENT_BINARY_DIR}/SPIRVTargets.cmake" DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake)
 
-    install(FILES ${HEADERS} ${SPVREMAP_HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/glslang/SPIRV/)
+    install(FILES ${PUBLIC_HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/glslang/SPIRV/)
 endif()

glslang/CMakeLists.txt

@@ -163,7 +163,7 @@ set(GLSLANG_HEADERS
     Include/SpirvIntrinsics.h
     Include/Types.h)
 
-add_library(glslang ${LIB_TYPE} ${BISON_GLSLParser_OUTPUT_SOURCE} ${GLSLANG_SOURCES} ${GLSLANG_HEADERS})
+add_library(glslang ${LIB_TYPE} ${GLSLANG_SOURCES} ${GLSLANG_HEADERS})
 set_target_properties(glslang PROPERTIES
     FOLDER glslang
     POSITION_INDEPENDENT_CODE ON
@@ -247,12 +247,16 @@ if(ENABLE_GLSLANG_INSTALL)
         install(FILES "${CMAKE_CURRENT_BINARY_DIR}/glslangTargets.cmake" DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake)
     endif()
 
-    set(ALL_HEADERS
-        ${GLSLANG_HEADERS}
-        ${MACHINEINDEPENDENT_HEADERS}
-        ${RESOURCELIMITS_HEADERS})
+    set(PUBLIC_HEADERS
+        Public/ResourceLimits.h
+        Public/ShaderLang.h
+        Public/resource_limits_c.h
+        Include/glslang_c_interface.h
+        Include/glslang_c_shader_types.h
+        Include/ResourceLimits.h
+        MachineIndependent/Versions.h)
 
-    foreach(file ${ALL_HEADERS})
+    foreach(file ${PUBLIC_HEADERS})
         get_filename_component(dir ${file} DIRECTORY)
         install(FILES ${file} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/glslang/${dir})
     endforeach()