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# Copyright 2020-2022 The Mumble Developers. All rights reserved.
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file at the root of the
# Mumble source tree or at <https://www.mumble.info/LICENSE>.
# Overlay payload for UNIX-like systems.
include(CheckIncludeFile)
if(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64" OR ${CMAKE_SYSTEM_PROCESSOR} STREQUAL "amd64")
if(NOT ${CMAKE_SYSTEM_NAME} STREQUAL "OpenBSD")
option(overlay-xcompile "Build 32 bit overlay library, necessary for the overlay to work with 32 bit processes." ON)
endif()
endif()
add_library(overlay_gl SHARED "overlay.c")
set_target_properties(overlay_gl
PROPERTIES
LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}
OUTPUT_NAME "mumbleoverlay"
VERSION ${CMAKE_PROJECT_VERSION}
)
if(NOT APPLE)
find_pkg(gl REQUIRED)
target_include_directories(overlay_gl PRIVATE ${gl_INCLUDE_DIRS})
target_link_options(overlay_gl BEFORE
PRIVATE
"-Wl,-z,lazy"
)
set_target_properties(overlay_gl
PROPERTIES
COMPILE_DEFINITIONS
"TARGET_UNIX"
)
if(overlay-xcompile)
# Just check for this header file while using a 32bit target as a really small and incomplete check whether g++-multilib seems to be
# installed. If we don't find it, we can assume it's not there but if we do find it, we still don't know. Thus we still print the
# message about the 32bit target potentially failing due to missing g++-multilib.
CHECK_INCLUDE_FILE("sys/cdefs.h" FOUND_CDEFS "-m32")
if(NOT FOUND_CDEFS)
message(FATAL_ERROR "Can't find the 32bit version of sys/cdefs.h - did you install g++-multilib?")
else()
message(STATUS "\nIf the 32 bit overlay library fails to compile, make sure the requirements are installed (\"g++-multilib\" package on Debian-based distributions).\n")
endif()
set_target_properties(overlay_gl
PROPERTIES
OUTPUT_NAME "mumbleoverlay.x86_64"
)
add_library(overlay_gl_x86 SHARED "overlay.c")
target_compile_definitions(overlay_gl_x86
PRIVATE
"TARGET_UNIX"
)
target_compile_options(overlay_gl_x86
PRIVATE
"-m32"
)
# Linking the overlay library with '-z now' requires all target processes to have libGL symbols in them at load time.
# If it doesn't, the program will not start at all.
#
# Instead, explicitly use '-z lazy' to defer libGL symbol resolution until first use, which is never for non-libGL users.
target_link_options(overlay_gl_x86 BEFORE
PRIVATE
"-m32"
"-Wl,-z,lazy"
)
set_target_properties(overlay_gl_x86
PROPERTIES
LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}
OUTPUT_NAME "mumbleoverlay.x86"
VERSION ${CMAKE_PROJECT_VERSION}
)
endif()
if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
target_link_libraries(overlay_gl
PRIVATE
"-ldl"
"-lrt"
)
if(TARGET overlay_gl_x86)
target_link_libraries(overlay_gl_x86
PRIVATE
"-ldl"
"-lrt"
)
# install 32bit overlay library
install(TARGETS overlay_gl_x86 LIBRARY DESTINATION "${MUMBLE_INSTALL_LIBDIR}")
endif()
endif()
else()
add_subdirectory("${3RDPARTY_DIR}/mach-override-build" "${CMAKE_CURRENT_BINARY_DIR}/mach-override")
find_library(LIB_COREFOUNDATION "CoreFoundation")
target_compile_definitions(overlay_gl
PRIVATE
"TARGET_MAC"
)
target_compile_options(overlay_gl
PRIVATE
"-ObjC"
)
target_sources(overlay_gl
PRIVATE
"avail_mac.h"
"overlay_gl.plist"
)
target_link_libraries(overlay_gl
PRIVATE
"-undefined dynamic_lookup" # Defer libGL symbol resolution until first use, which is never for non-libGL users.
mach-override
${LIB_COREFOUNDATION}
)
endif()
# install native overlay library
install(TARGETS overlay_gl LIBRARY DESTINATION "${MUMBLE_INSTALL_LIBDIR}")
# install overlay script
install(PROGRAMS "${CMAKE_SOURCE_DIR}/scripts/mumble-overlay" DESTINATION "${MUMBLE_INSTALL_SCRIPTDIR}")
# install overlay man-files
install(FILES "${CMAKE_SOURCE_DIR}/man/mumble-overlay.1" DESTINATION "${MUMBLE_INSTALL_MANDIR}" COMPONENT doc)
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