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Fix GLESv2 linkage with Emscripten

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There's no library to link against and the headers are in the system, so
we can create a synthetic import library after verifying the
compilation.

Change-Id: I9baa32cfe06f2f48adf066d558aa69646143efd0
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Qt CMake Build Bot
This commit is contained in:
Simon Hausmann 2019-08-29 17:00:56 +02:00
parent 4b592ba90c
commit 2fd3b44697
1 changed files with 29 additions and 18 deletions
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39
cmake/FindGLESv2.cmake
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@ -1,14 +1,18 @@
include(CheckCXXSourceCompiles) include(CheckCXXSourceCompiles)
find_library(GLESv2_LIBRARY NAMES GLESv2) # No library linkage is necessary to use GLESv2 with Emscripten. The headers are also
find_path(GLESv2_INCLUDE_DIR NAMES "GLES2/gl2.h" DOC "The OpenGLES 2 include path") # system headers, so we don't need to search for them.
if(EMSCRIPTEN)
set(HAVE_GLESv2 ON)
else()
find_library(GLESv2_LIBRARY NAMES GLESv2)
find_path(GLESv2_INCLUDE_DIR NAMES "GLES2/gl2.h" DOC "The OpenGLES 2 include path")
set(_libraries "${CMAKE_REQUIRED_LIBRARIES}")
list(APPEND CMAKE_REQUIRED_LIBRARIES "${GLESv2_LIBRARY}")
set(_includes "${CMAKE_REQUIRED_INCLUDES}")
list(APPEND CMAKE_REQUIRED_INCLUDES "${GLESv2_INCLUDE_DIR}")
set(_libraries "${CMAKE_REQUIRED_LIBRARIES}") check_cxx_source_compiles("
list(APPEND CMAKE_REQUIRED_LIBRARIES "${GLESv2_LIBRARY}")
set(_includes "${CMAKE_REQUIRED_INCLUDES}")
list(APPEND CMAKE_REQUIRED_INCLUDES "${GLESv2_INCLUDE_DIR}")
check_cxx_source_compiles("
#ifdef __APPLE__ #ifdef __APPLE__
# include <OpenGLES/ES2/gl.h> # include <OpenGLES/ES2/gl.h>
#else #else
@ -21,20 +25,27 @@ int main(int argc, char *argv[]) {
glClear(GL_COLOR_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT);
}" HAVE_GLESv2) }" HAVE_GLESv2)
set(CMAKE_REQUIRED_LIBRARY "${_libraries}") set(CMAKE_REQUIRED_LIBRARY "${_libraries}")
unset(_libraries) unset(_libraries)
set(CMAKE_REQUIRED_INCLUDES "${_includes}") set(CMAKE_REQUIRED_INCLUDES "${_includes}")
unset(_includes) unset(_includes)
set(package_args GLESv2_INCLUDE_DIR GLESv2_LIBRARY HAVE_GLESv2)
endif()
list(APPEND package_args HAVE_GLESv2)
include(FindPackageHandleStandardArgs) include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(GLESv2 DEFAULT_MSG GLESv2_INCLUDE_DIR GLESv2_LIBRARY HAVE_GLESv2) find_package_handle_standard_args(GLESv2 DEFAULT_MSG ${package_args})
mark_as_advanced(GLESv2_INCLUDE_DIR GLESv2_LIBRARY HAVE_GLESv2) mark_as_advanced(${package_args})
if(GLESv2_FOUND AND NOT TARGET GLESv2::GLESv2) if(GLESv2_FOUND AND NOT TARGET GLESv2::GLESv2)
if(EMSCRIPTEN)
add_library(GLESv2::GLESv2 INTERFACE IMPORTED)
else()
add_library(GLESv2::GLESv2 UNKNOWN IMPORTED) add_library(GLESv2::GLESv2 UNKNOWN IMPORTED)
set_target_properties(GLESv2::GLESv2 PROPERTIES set_target_properties(GLESv2::GLESv2 PROPERTIES
IMPORTED_LOCATION "${GLESv2_LIBRARY}" IMPORTED_LOCATION "${GLESv2_LIBRARY}"
INTERFACE_INCLUDE_DIRECTORIES "${GLESv2_INCLUDE_DIR}") INTERFACE_INCLUDE_DIRECTORIES "${GLESv2_INCLUDE_DIR}")
endif()
endif() endif()