# Copyright 2013 Intel Corporation
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# - Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
#
# - Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

include(CheckCCompilerFlag)
include(WaffleCheckThreadLocalStorage)

function(waffle_add_c_flag flag var)
    check_c_compiler_flag("${flag}" ${var})
    if(${var})
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}" PARENT_SCOPE)
    endif()
endfunction()

if (NOT MSVC)
    #
    # compiler flags
    #
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --std=c99")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
    set(CMAKE_C_FLAGS_DEBUG "-g3 -O0 -DDEBUG")

    # Use '-g1' to produce enough debug info for generating backtraces, but not
    # enough for single-stepping.
    set(CMAKE_C_FLAGS_RELEASE "-g1 -O2 -DNDEBUG")

    # These are disabled for NaCl because compilation against ppapi_simple would fail.
    if(NOT waffle_has_nacl)
        waffle_add_c_flag("-Werror=implicit-function-declaration" WERROR_IMPLICIT_FUNCTION_DECLARATION)
        waffle_add_c_flag("-fvisibility=hidden" WITH_VISIBILITY_HIDDEN)
    endif()

    waffle_add_c_flag("-Werror=incompatible-pointer-types" WERROR_INCOMPATIBLE_POINTER_TYPES)
    waffle_add_c_flag("-Werror=int-conversion" WERROR_INT_CONVERSION)

    if(waffle_on_linux AND NOT waffle_has_nacl)
        # On MacOS, the SSE2 headers trigger this error.
        waffle_add_c_flag("-Werror=missing-prototypes" WERROR_MISSING_PROTOTYPES)
    endif()

    if(egl_FOUND)
        foreach(FLAG ${egl_CFLAGS_OTHER})
            set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${FLAG}")
        endforeach()
    endif(egl_FOUND)

    if(MINGW)
        # Avoid depending on MinGW runtime DLLs
        check_c_compiler_flag(-static-libgcc HAVE_STATIC_LIBGCC_FLAG)
        if (HAVE_STATIC_LIBGCC_FLAG)
            set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static-libgcc")
            set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -static-libgcc")
            set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -static-libgcc")
        endif ()
    else()
        # Avoid using TLS with MinGW builds.
        waffle_check_thread_local_storage()
    endif()
else()
   # XXX: and update the threads code
   # http://msdn.microsoft.com/en-us/library/aa383745.aspx
    if(CMAKE_GENERATOR_TOOLSET MATCHES "_xp$")
        # Windows XP
        add_definitions(-D_WIN32_WINNT=0x0501 -DWINVER=0x0501)
    else()
        # Windows 7
        add_definitions(-D_WIN32_WINNT=0x0601 -DWINVER=0x0601)
    endif()

    # Adjust warnings
    add_definitions(-D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_WARNINGS)

    # Use static runtime
    # http://www.cmake.org/Wiki/CMake_FAQ#How_can_I_build_my_MSVC_application_with_a_static_runtime.3F
    foreach(flag_var
        CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO
    )
        if(${flag_var} MATCHES "/MD")
            string (REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
        endif()
    endforeach(flag_var)

endif()

if(waffle_on_mac)
    add_definitions(-DWAFFLE_HAS_CGL -DGL_SILENCE_DEPRECATION)
endif()

if(waffle_on_linux)
    if(waffle_has_glx)
        add_definitions(-DWAFFLE_HAS_GLX)
    endif()

    if(waffle_has_wayland)
        add_definitions(-DWAFFLE_HAS_WAYLAND)
    endif()

    if(waffle_has_x11_egl)
        add_definitions(-DWAFFLE_HAS_X11_EGL)
    endif()

    if(waffle_has_gbm)
        add_definitions(-DWAFFLE_HAS_GBM)
    endif()

    if(waffle_has_surfaceless_egl)
        add_definitions(-DWAFFLE_HAS_SURFACELESS_EGL)
    endif()

    if(waffle_has_tls)
        add_definitions(-DWAFFLE_HAS_TLS)
    endif()

    if(waffle_has_tls_model_initial_exec)
        add_definitions(-DWAFFLE_HAS_TLS_MODEL_INITIAL_EXEC)
    endif()

    add_definitions(-D_XOPEN_SOURCE=700)
endif()

if(waffle_has_nacl)
    add_definitions(-DWAFFLE_HAS_NACL)
endif()

if(waffle_on_windows)
    add_definitions(-DWAFFLE_HAS_WGL)
endif()
