FindSDL2.cmake

Question

我尝试在使用Makefile构建的项目中使用SDL2，SDL2_ttf和SDL2_image。我尝试了很多不同的方法，但无论我到目前为止做了什么，SDL2_ttf和SDL2_image会抛出类似于以下内容的错误。

/Library/Frameworks/SDL2_ttf.framework/Headers/SDL_ttf.h:34:10: fatal error: 
      'SDL2/SDL.h' file not found

我可以使用以下CMakeLists和值成功使用CMake构建项目。

cmake_minimum_required(VERSION 3.0)
project(kiss_sdl)


set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${kiss_sdl_SOURCE_DIR}/cmake")
set(BIN_DIR ${kiss_sdl_SOURCE_DIR}/bin)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

add_definitions(-DRESDIR=\"../../\")

find_package(SDL2 REQUIRED)
include_directories(${SDL2_INCLUDE_DIR})

find_package(SDL2_ttf REQUIRED)
include_directories(${SDL2_TTF_INCLUDE_DIR})

find_package(SDL2_image REQUIRED)
include_directories(${SDL2_IMAGE_INCLUDE_DIR})


add_executable(kiss_sdl kiss_example1.c kiss_draw.c kiss_general.c kiss_posix.c kiss_widgets.c kiss_sdl.h)


target_link_libraries(kiss_sdl ${SDL2_LIBRARY} ${SDL2_TTF_LIBRARY} ${SDL2_IMAGE_LIBRARY})
install(TARGETS kiss_sdl RUNTIME DESTINATION ${BIN_DIR})

我用来在CMake中找到SDL的CMake模块如下所示。

FindSDL2.cmake

# Locate SDL2 library
# This module defines
# SDL2_LIBRARY, the name of the library to link against
# SDL2_FOUND, if false, do not try to link to SDL2
# SDL2_INCLUDE_DIR, where to find SDL.h
#
# This module responds to the the flag:
# SDL2_BUILDING_LIBRARY
# If this is defined, then no SDL2_main will be linked in because
# only applications need main().
# Otherwise, it is assumed you are building an application and this
# module will attempt to locate and set the the proper link flags
# as part of the returned SDL2_LIBRARY variable.
#
# Don't forget to include SDL2main.h and SDL2main.m your project for the
# OS X framework based version. (Other versions link to -lSDL2main which
# this module will try to find on your behalf.) Also for OS X, this
# module will automatically add the -framework Cocoa on your behalf.
#
#
# Additional Note: If you see an empty SDL2_LIBRARY_TEMP in your configuration
# and no SDL2_LIBRARY, it means CMake did not find your SDL2 library
# (SDL2.dll, libsdl2.so, SDL2.framework, etc).
# Set SDL2_LIBRARY_TEMP to point to your SDL2 library, and configure again.
# Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this value
# as appropriate. These values are used to generate the final SDL2_LIBRARY
# variable, but when these values are unset, SDL2_LIBRARY does not get created.
#
#
# $SDL2 is an environment variable that would
# correspond to the ./configure --prefix=$SDL2
# used in building SDL2.
# l.e.galup 9-20-02
#
# Modified by Eric Wing.
# Added code to assist with automated building by using environmental variables
# and providing a more controlled/consistent search behavior.
# Added new modifications to recognize OS X frameworks and
# additional Unix paths (FreeBSD, etc).
# Also corrected the header search path to follow "proper" SDL2 guidelines.
# Added a search for SDL2main which is needed by some platforms.
# Added a search for threads which is needed by some platforms.
# Added needed compile switches for MinGW.
#
# On OSX, this will prefer the Framework version (if found) over others.
# People will have to manually change the cache values of
# SDL2_LIBRARY to override this selection or set the CMake environment
# CMAKE_INCLUDE_PATH to modify the search paths.
#
# Note that the header path has changed from SDL2/SDL.h to just SDL.h
# This needed to change because "proper" SDL2 convention
# is #include "SDL.h", not <SDL2/SDL.h>. This is done for portability
# reasons because not all systems place things in SDL2/ (see FreeBSD).
#
# Ported by Johnny Patterson. This is a literal port for SDL2 of the FindSDL.cmake
# module with the minor edit of changing "SDL" to "SDL2" where necessary. This
# was not created for redistribution, and exists temporarily pending official
# SDL2 CMake modules.
#
# Note that on windows this will only search for the 32bit libraries, to search
# for 64bit change x86/i686-w64 to x64/x86_64-w64

#=============================================================================
# Copyright 2003-2009 Kitware, Inc.
#
# CMake - Cross Platform Makefile Generator
# Copyright 2000-2014 Kitware, Inc.
# Copyright 2000-2011 Insight Software Consortium
# 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.
#
# * Neither the names of Kitware, Inc., the Insight Software Consortium,
# nor the names of their contributors may be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# 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.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)

FIND_PATH(SDL2_INCLUDE_DIR SDL.h
    HINTS
    ${SDL2}
    $ENV{SDL2}
    PATH_SUFFIXES include/SDL2 include SDL2
    i686-w64-mingw32/include/SDL2
    x86_64-w64-mingw32/include/SDL2
    PATHS
    ~/Library/Frameworks
    /Library/Frameworks
    /usr/local/include/SDL2
    /usr/include/SDL2
    /sw # Fink
    /opt/local # DarwinPorts
    /opt/csw # Blastwave
    /opt
)

# Lookup the 64 bit libs on x64
IF(CMAKE_SIZEOF_VOID_P EQUAL 8)
    FIND_LIBRARY(SDL2_LIBRARY_TEMP SDL2
        HINTS
        ${SDL2}
        $ENV{SDL2}
        PATH_SUFFIXES lib64 lib
        lib/x64
        x86_64-w64-mingw32/lib
        PATHS
        /sw
        /opt/local
        /opt/csw
        /opt
    )
# On 32bit build find the 32bit libs
ELSE(CMAKE_SIZEOF_VOID_P EQUAL 8)
    FIND_LIBRARY(SDL2_LIBRARY_TEMP SDL2
        HINTS
        ${SDL2}
        $ENV{SDL2}
        PATH_SUFFIXES lib
        lib/x86
        i686-w64-mingw32/lib
        PATHS
        /sw
        /opt/local
        /opt/csw
        /opt
    )
ENDIF(CMAKE_SIZEOF_VOID_P EQUAL 8)

IF(NOT SDL2_BUILDING_LIBRARY)
    IF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
        # Non-OS X framework versions expect you to also dynamically link to
        # SDL2main. This is mainly for Windows and OS X. Other (Unix) platforms
        # seem to provide SDL2main for compatibility even though they don't
        # necessarily need it.
        # Lookup the 64 bit libs on x64
        IF(CMAKE_SIZEOF_VOID_P EQUAL 8)
            FIND_LIBRARY(SDL2MAIN_LIBRARY
                NAMES SDL2main
                HINTS
                ${SDL2}
                $ENV{SDL2}
                PATH_SUFFIXES lib64 lib
                lib/x64
                x86_64-w64-mingw32/lib
                PATHS
                /sw
                /opt/local
                /opt/csw
                /opt
                )
            # On 32bit build find the 32bit libs
        ELSE(CMAKE_SIZEOF_VOID_P EQUAL 8)
            FIND_LIBRARY(SDL2MAIN_LIBRARY
                NAMES SDL2main
                HINTS
                ${SDL2}
                $ENV{SDL2}
                PATH_SUFFIXES lib
                lib/x86
                i686-w64-mingw32/lib
                PATHS
                /sw
                /opt/local
                /opt/csw
                /opt
                )
        ENDIF(CMAKE_SIZEOF_VOID_P EQUAL 8)
    ENDIF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
ENDIF(NOT SDL2_BUILDING_LIBRARY)

# SDL2 may require threads on your system.
# The Apple build may not need an explicit flag because one of the
# frameworks may already provide it.
# But for non-OSX systems, I will use the CMake Threads package.
IF(NOT APPLE)
    FIND_PACKAGE(Threads)
ENDIF(NOT APPLE)

# MinGW needs an additional library, mwindows
# It's total link flags should look like -lmingw32 -lSDL2main -lSDL2 -lmwindows
# (Actually on second look, I think it only needs one of the m* libraries.)
IF(MINGW)
    SET(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW")
ENDIF(MINGW)

SET(SDL2_FOUND "NO")
    IF(SDL2_LIBRARY_TEMP)
        # For SDL2main
        IF(NOT SDL2_BUILDING_LIBRARY)
            IF(SDL2MAIN_LIBRARY)
                SET(SDL2_LIBRARY_TEMP ${SDL2MAIN_LIBRARY} ${SDL2_LIBRARY_TEMP})
            ENDIF(SDL2MAIN_LIBRARY)
        ENDIF(NOT SDL2_BUILDING_LIBRARY)

        # For OS X, SDL2 uses Cocoa as a backend so it must link to Cocoa.
        # CMake doesn't display the -framework Cocoa string in the UI even
        # though it actually is there if I modify a pre-used variable.
        # I think it has something to do with the CACHE STRING.
        # So I use a temporary variable until the end so I can set the
        # "real" variable in one-shot.
        IF(APPLE)
            SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} "-framework Cocoa")
        ENDIF(APPLE)

        # For threads, as mentioned Apple doesn't need this.
        # In fact, there seems to be a problem if I used the Threads package
        # and try using this line, so I'm just skipping it entirely for OS X.
        IF(NOT APPLE)
            SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${CMAKE_THREAD_LIBS_INIT})
        ENDIF(NOT APPLE)

        # For MinGW library
        IF(MINGW)
            SET(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP})
        ENDIF(MINGW)

        # Set the final string here so the GUI reflects the final state.
        SET(SDL2_LIBRARY ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL2 Library can be found")
        # Set the temp variable to INTERNAL so it is not seen in the CMake GUI
        SET(SDL2_LIBRARY_TEMP "${SDL2_LIBRARY_TEMP}" CACHE INTERNAL "")

        SET(SDL2_FOUND "YES")
ENDIF(SDL2_LIBRARY_TEMP)

INCLUDE(FindPackageHandleStandardArgs)

FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR)

FindSDL2_ttf.cmake

# Locate SDL2_ttf library
# This module defines
# SDL2_TTF_LIBRARY, the name of the library to link against
# SDL2_TTF_FOUND, if false, do not try to link to SDL2_ttf
# SDL2_TTF_INCLUDE_DIR, where to find SDL_image.h
#
# Additional Note: If you see an empty SDL2_TTF_LIBRARY_TEMP in your configuration
# and no SDL2_TTF_LIBRARY, it means CMake did not find your SDL2_Image library
# (SDL2_ttf.dll, libsdl2_image.so, SDL2_ttf.framework, etc).
# Set SDL2_TTF_LIBRARY_TEMP to point to your SDL2 library, and configure again.
# Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this value
# as appropriate. These values are used to generate the final SDL2_TTF_LIBRARY
# variable, but when these values are unset, SDL2_TTF_LIBRARY does not get created.
#
# $SDL2 is an environment variable that would
# correspond to the ./configure --prefix=$SDL2
# used in building SDL2.
# l.e.galup 9-20-02
#
# Modified by Eric Wing.
# Added code to assist with automated building by using environmental variables
# and providing a more controlled/consistent search behavior.
# Added new modifications to recognize OS X frameworks and
# additional Unix paths (FreeBSD, etc).
# Also corrected the header search path to follow "proper" SDL2 guidelines.
# Added a search for SDL2main which is needed by some platforms.
# Added a search for threads which is needed by some platforms.
# Added needed compile switches for MinGW.
#
# On OSX, this will prefer the Framework version (if found) over others.
# People will have to manually change the cache values of
# SDL2_TTF_LIBRARY to override this selection or set the CMake environment
# CMAKE_INCLUDE_PATH to modify the search paths.
#
# Note that the header path has changed from SDL2/SDL.h to just SDL.h
# This needed to change because "proper" SDL2 convention
# is #include "SDL.h", not <SDL2/SDL.h>. This is done for portability
# reasons because not all systems place things in SDL2/ (see FreeBSD).
#
# Ported by Johnny Patterson. This is a literal port for SDL2 of the FindSDL.cmake
# module with the minor edit of changing "SDL" to "SDL2" where necessary. This
# was not created for redistribution, and exists temporarily pending official
# SDL2 CMake modules.
# 
# Note that on windows this will only search for the 32bit libraries, to search
# for 64bit change x86/i686-w64 to x64/x86_64-w64

#=============================================================================
# Copyright 2003-2009 Kitware, Inc.
#
# CMake - Cross Platform Makefile Generator
# Copyright 2000-2014 Kitware, Inc.
# Copyright 2000-2011 Insight Software Consortium
# 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.
#
# * Neither the names of Kitware, Inc., the Insight Software Consortium,
# nor the names of their contributors may be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# 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.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)

FIND_PATH(SDL2_TTF_INCLUDE_DIR SDL_ttf.h
    HINTS
    ${SDL2}
    $ENV{SDL2}
    $ENV{SDL2_TTF}
    PATH_SUFFIXES include/SDL2 include SDL2
    i686-w64-mingw32/include/SDL2
    PATHS
    ~/Library/Frameworks
    /Library/Frameworks
    /usr/local/include/SDL2
    /usr/include/SDL2
    /sw # Fink
    /opt/local # DarwinPorts
    /opt/csw # Blastwave
    /opt
)

# Lookup the 64 bit libs on x64
IF(CMAKE_SIZEOF_VOID_P EQUAL 8)
    FIND_LIBRARY(SDL2_TTF_LIBRARY_TEMP
        NAMES SDL2_ttf
        HINTS
        ${SDL2}
        $ENV{SDL2}
        $ENV{SDL2_TTF}
        PATH_SUFFIXES lib64 lib
        lib/x64
        x86_64-w64-mingw32/lib
        PATHS
        /sw
        /opt/local
        /opt/csw
        /opt
    )
# On 32bit build find the 32bit libs
ELSE(CMAKE_SIZEOF_VOID_P EQUAL 8)
    FIND_LIBRARY(SDL2_TTF_LIBRARY_TEMP
        NAMES SDL2_ttf
        HINTS
        ${SDL2}
        $ENV{SDL2}
        $ENV{SDL2_TTF}
        PATH_SUFFIXES lib
        lib/x86
        i686-w64-mingw32/lib
        PATHS
        /sw
        /opt/local
        /opt/csw
        /opt
    )
ENDIF(CMAKE_SIZEOF_VOID_P EQUAL 8)

SET(SDL2_TTF_FOUND "NO")
    IF(SDL2_TTF_LIBRARY_TEMP)
    # Set the final string here so the GUI reflects the final state.
    SET(SDL2_TTF_LIBRARY ${SDL2_TTF_LIBRARY_TEMP} CACHE STRING "Where the SDL2_ttf Library can be found")
    # Set the temp variable to INTERNAL so it is not seen in the CMake GUI
    SET(SDL2_TTF_LIBRARY_TEMP "${SDL2_TTF_LIBRARY_TEMP}" CACHE INTERNAL "")
    SET(SDL2_TTF_FOUND "YES")
ENDIF(SDL2_TTF_LIBRARY_TEMP)

INCLUDE(FindPackageHandleStandardArgs)

FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2_TTF REQUIRED_VARS SDL2_TTF_LIBRARY SDL2_TTF_INCLUDE_DIR)

FindSDL2_image.cmake

# Locate SDL2_image library
# This module defines
# SDL2_IMAGE_LIBRARY, the name of the library to link against
# SDL2_IMAGE_FOUND, if false, do not try to link to SDL2_image
# SDL2_IMAGE_INCLUDE_DIR, where to find SDL_image.h
#
# Additional Note: If you see an empty SDL2_IMAGE_LIBRARY_TEMP in your configuration
# and no SDL2_IMAGE_LIBRARY, it means CMake did not find your SDL2_Image library
# (SDL2_image.dll, libsdl2_image.so, SDL2_image.framework, etc).
# Set SDL2_IMAGE_LIBRARY_TEMP to point to your SDL2 library, and configure again.
# Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this value
# as appropriate. These values are used to generate the final SDL2_IMAGE_LIBRARY
# variable, but when these values are unset, SDL2_IMAGE_LIBRARY does not get created.
#
# $SDL2 is an environment variable that would
# correspond to the ./configure --prefix=$SDL2
# used in building SDL2.
# l.e.galup 9-20-02
#
# Modified by Eric Wing.
# Added code to assist with automated building by using environmental variables
# and providing a more controlled/consistent search behavior.
# Added new modifications to recognize OS X frameworks and
# additional Unix paths (FreeBSD, etc).
# Also corrected the header search path to follow "proper" SDL2 guidelines.
# Added a search for SDL2main which is needed by some platforms.
# Added a search for threads which is needed by some platforms.
# Added needed compile switches for MinGW.
#
# On OSX, this will prefer the Framework version (if found) over others.
# People will have to manually change the cache values of
# SDL2_IMAGE_LIBRARY to override this selection or set the CMake environment
# CMAKE_INCLUDE_PATH to modify the search paths.
#
# Note that the header path has changed from SDL2/SDL.h to just SDL.h
# This needed to change because "proper" SDL2 convention
# is #include "SDL.h", not <SDL2/SDL.h>. This is done for portability
# reasons because not all systems place things in SDL2/ (see FreeBSD).
#
# Ported by Johnny Patterson. This is a literal port for SDL2 of the FindSDL.cmake
# module with the minor edit of changing "SDL" to "SDL2" where necessary. This
# was not created for redistribution, and exists temporarily pending official
# SDL2 CMake modules.
# 
# Note that on windows this will only search for the 32bit libraries, to search
# for 64bit change x86/i686-w64 to x64/x86_64-w64

#=============================================================================
# Copyright 2003-2009 Kitware, Inc.
#
# CMake - Cross Platform Makefile Generator
# Copyright 2000-2014 Kitware, Inc.
# Copyright 2000-2011 Insight Software Consortium
# 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.
#
# * Neither the names of Kitware, Inc., the Insight Software Consortium,
# nor the names of their contributors may be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# 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.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)

FIND_PATH(SDL2_IMAGE_INCLUDE_DIR SDL_image.h
    HINTS
    ${SDL2}
    $ENV{SDL2}
    $ENV{SDL2_IMAGE}
    PATH_SUFFIXES include/SDL2 include SDL2
    i686-w64-mingw32/include/SDL2
    x86_64-w64-mingw32/include/SDL2
    PATHS
    ~/Library/Frameworks
    /Library/Frameworks
    /usr/local/include/SDL2
    /usr/include/SDL2
    /sw # Fink
    /opt/local # DarwinPorts
    /opt/csw # Blastwave
    /opt
)

# Lookup the 64 bit libs on x64
IF(CMAKE_SIZEOF_VOID_P EQUAL 8)
    FIND_LIBRARY(SDL2_IMAGE_LIBRARY_TEMP
        NAMES SDL2_image
        HINTS
        ${SDL2}
        $ENV{SDL2}
        $ENV{SDL2_IMAGE}
        PATH_SUFFIXES lib64 lib
        lib/x64
        x86_64-w64-mingw32/lib
        PATHS
        /sw
        /opt/local
        /opt/csw
        /opt
    )
# On 32bit build find the 32bit libs
ELSE(CMAKE_SIZEOF_VOID_P EQUAL 8)
    FIND_LIBRARY(SDL2_IMAGE_LIBRARY_TEMP
        NAMES SDL2_image
        HINTS
        ${SDL2}
        $ENV{SDL2}
        $ENV{SDL2_IMAGE}
        PATH_SUFFIXES lib
        lib/x86
        i686-w64-mingw32/lib
        PATHS
        /sw
        /opt/local
        /opt/csw
        /opt
    )
ENDIF(CMAKE_SIZEOF_VOID_P EQUAL 8)

SET(SDL2_IMAGE_FOUND "NO")
    IF(SDL2_IMAGE_LIBRARY_TEMP)
    # Set the final string here so the GUI reflects the final state.
    SET(SDL2_IMAGE_LIBRARY ${SDL2_IMAGE_LIBRARY_TEMP} CACHE STRING "Where the SDL2_image Library can be found")
    # Set the temp variable to INTERNAL so it is not seen in the CMake GUI
    SET(SDL2_IMAGE_LIBRARY_TEMP "${SDL2_IMAGE_LIBRARY_TEMP}" CACHE INTERNAL "")
    SET(SDL2_IMAGE_FOUND "YES")
ENDIF(SDL2_IMAGE_LIBRARY_TEMP)

INCLUDE(FindPackageHandleStandardArgs)

FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2_IMAGE REQUIRED_VARS SDL2_IMAGE_LIBRARY SDL2_IMAGE_INCLUDE_DIR)

以下是makefile，然后是我试过的一些不同的方法。我已从makefile中删除了一些不相关的代码以使其更清晰，请参阅完整代码on GitHub。

#CPP = clang++
#C = clang
CPP = g++
C = gcc

### Macintosh

LDFLAGS = -L/Library/Frameworks/SDL2.framework \
-L/Library/Frameworks/SDL2_ttf.framework \
-L/Library/Frameworks/SDL2_image.framework \
-lSDL2 -lSDL2_image -lSDL2_ttf
CFLAGS = -I/Library/Frameworks/SDL2.framework/Headers \
-I/Library/Frameworks/SDL2_ttf.framework/Headers \
-I/Library/Frameworks/SDL2_image.framework/Headers \
-Wall -c -std=c89
EXE1 = kiss_example1
EXE2 = kiss_example2

### Linux

#LDFLAGS = -lSDL2 -lSDL2_image -lSDL2_ttf
#CFLAGS = -Wall -c -std=c89
#EXE1 = kiss_example1
#EXE2 = kiss_example2

all: $(EXE1) $(EXE2)

$(EXE1): kiss_example1.o kiss_widgets.o kiss_draw.o kiss_general.o \
kiss_posix.o
    $(C) $^ $(LDFLAGS) -o $@

$(EXE2): kiss_example2.o kiss_widgets.o kiss_draw.o kiss_general.o \
kiss_posix.o
    $(C) $^ $(LDFLAGS) -o $@

kiss_example1.o: kiss_example1.c
    $(C) $(CFLAGS) $^ -o $@

kiss_example2.o: kiss_example2.c
    $(C) $(CFLAGS) $^ -o $@

kiss_widgets.o: kiss_widgets.c
    $(C) $(CFLAGS) $^ -o $@

kiss_draw.o: kiss_draw.c
    $(C) $(CFLAGS) $^ -o $@

kiss_general.o: kiss_general.c
    $(C) $(CFLAGS) $^ -o $@

kiss_posix.o: kiss_posix.c
    $(C) $(CFLAGS) $^ -o $@

clean:
    rm *.o && rm $(EXE1) && rm $(EXE2)
#   del *.o
#   del $(EXE1)
#   del $(EXE2)

1

LDFLAGS = -framework SDL -framework SDL_ttf -framework SDL_image
CFLAGS = -framework SDL -framework SDL_ttf -framework SDL_image \
-Wall -c -std=c89
EXE1 = kiss_example1
EXE2 = kiss_example2

2

LDFLAGS = -framework SDL -framework SDL_ttf -framework SDL_image
CFLAGS = -framework SDL -framework SDL_ttf -framework SDL_image \
-I/Library/Frameworks/SDL2.framework/Headers \
-I/Library/Frameworks/SDL2_ttf.framework/Headers \
-I/Library/Frameworks/SDL2_image.framework/Headers \
-Wall -c -std=c89
EXE1 = kiss_example1
EXE2 = kiss_example2

3

LDFLAGS = -framework SDL -framework SDL_ttf -framework SDL_image
CFLAGS = -Wall -c -std=c89
EXE1 = kiss_example1
EXE2 = kiss_example2

我尝试构建的完整项目是KISS_SDL，可以找到on GitHub。

Answer 1

原因在您显示的每个FindSDL*.cmake脚本中写为注释：

请注意，标头路径已从SDL2 / SDL.h更改为SDL.h

可能您使用来自不兼容版本的库SDL和SDL_ttf的标头：第一个提供主标题为SDL.h，但第二个标题为SDL2/SDL2.h }。

Answer 2

我通常使用pkg-config来发现标头和库位置。这应该可以使用GNU make：

SDL2_CXXFLAGS := \
    $(shell pkg-config sdl2 --cflags) \
    $(shell pkg-config SDL2_ttf --cflags) \
    $(shell pkg-config SDL2_image --cflags)

SDL2_LDFLAGS := \
    $(shell pkg-config sdl2 --libs) \
    $(shell pkg-config SDL2_ttf --libs) \
    $(shell pkg-config SDL2_image --libs)

我没有在pkg-config上使用Windows，但显然它可用。

Answer 3

CMake和make完全不同，尽管有相关的目的。 CMake根据各种CMakeLists.txt文件的要求分析运行它的系统，并构造Makefile。然后，您可以通过make执行实际构建。 CMake的角色类似于传统的configure脚本，尤其是GNU Autoconf生成的配置脚本。

那么CMake如何发现SDL2标头的位置？它在系统的某个地方有一个小脚本，知道如何操作。实际上有几个。（数百个这些都包含在CMake安装中，软件分销商也可以自己提供。）它可以使用pkg-config，因为另一个答案建议您自己做，或者它可能会测试几个常见位置，或者它可能会使用其他一些设施。您的CMakeLists.txt会调用其中的三个，并指示CMake如何在这些行中使用结果：

find_package(SDL2 REQUIRED)
include_directories(${SDL2_INCLUDE_DIR})

find_package(SDL2_ttf REQUIRED)
include_directories(${SDL2_TTF_INCLUDE_DIR})

find_package(SDL2_image REQUIRED)
include_directories(${SDL2_IMAGE_INCLUDE_DIR})

您可以通过检查相应的cmake脚本来确定CMake实际执行的操作。在我的Linux系统上，他们将是

/usr/share/cmake/Modules/FindSDL.cmake
/usr/share/cmake/Modules/FindSDL_ttf.cmake
/usr/share/cmake/Modules/FindSDL_image.cmake

您在Mac上找到它们的位置取决于CMake的安装方式的详细信息。

或者，您可以检查Makefile生成的CMake。它会比你的更复杂，但你应该能够确定哪些标志传递给编译器和链接器。

Answer 4

我遇到了与SDL2类似的问题，我按照这些答案中的说明进行了修复：

On mac, g++ (clang) fails to search /usr/local/include and /usr/local/lib by default

出于某种原因，OSX似乎默认覆盖了include和lib路径。

Answer 5

这是编写makefile的一种方法：

由于makefile名为kiss_makefile，因此以下make文件将通过以下方式执行：

make -f kiss_makefile

现在是makefile内容：

CPP := /bin/g++
C   := /bin/gcc
RM  := /bin/rm


C_FLAGS_32 := -D32_BIT \
    -IC:\SDL2-2.0.4\include \
    -IC:\SDL2-2.0.4\i686-w64-mingw32\include \
    -IC:\SDL2_ttf-2.0.14\i686-w64-mingw32\include \
    -IC:\SDL2_image-2.0.1\i686-w64-mingw32\include \
    -Wall -Wextra -Wconversion -pedantic -c -std=gnu99 -m32 -march=i686

C_FLAGS_64 := -D64_BIT \
    -IC:\SDL2-2.0.4\x86_64-w64-mingw32\include \
    -IC:\SDL2_ttf-2.0.14\x86_64-w64-mingw32\include \
    -IC:\SDL2_image-2.0.1\x86_64-w64-mingw32\include \
    -Wall -Wextra -Wconversion -pedantic -c -std=gnu99

L_FLAGS_32 := \
    -LC:\SDL2-2.0.4\x86_64-w64-mingw32\lib \
    -LC:\SDL2_ttf-2.0.14\x86_64-w64-mingw32\lib \
    -LC:\SDL2_image-2.0.1\x86_64-w64-mingw32\lib \
    -lmingw32 -lSDL2main -lSDL2 -lSDL2_image -lSDL2_ttf \
    -mwindows

L_FLAGS_64 := \
    -LC:\SDL2-2.0.4\x86_64-w64-mingw32\lib \
    -LC:\SDL2_ttf-2.0.14\x86_64-w64-mingw32\lib \
    -LC:\SDL2_image-2.0.1\x86_64-w64-mingw32\lib \
    -lmingw32 -lSDL2main -lSDL2 -lSDL2_image -lSDL2_ttf \
    -mwindows

ARCH := $(shell getconf LONG_BIT)

CFLAGS := C_FLAGS_$(ARCH)

LFLAGS := L_FLAGS_$(ARCH)

SRC1 := kiss_example1.c kiss_widgets.c kiss_draw.c kiss_general.o kiss_posix.c
OBJ1 := $(SRC1:.c=.o)

SRC2 := kiss_example2.c kiss_widgets.c kiss_draw.c kiss_general.o kiss_posix.c
OBJ2 := $(SRC2:.c=.o)

.PHONY: all
all: $(EXE1) $(EXE2)

$(EXE1): $(OBJ1)
<tab>$(C) $^  -o $@ $(LDFLAGS)

$(EXE2): $(OBJ2)
<tab>$(C) $^  -o $@ $(LDFLAGS)

%.o:%.c
<tab>$(C) $(CFLAGS) $< -o $@


.PHONY: clean
clean:
<tab>rm *.o
<tab>rm $(EXE1)
<tab>rm $(EXE2)

请注意make对某些目标：all和clean不会生成同名文件的正确指示

请注意用于将每个源文件编译为目标文件的通用规则/配方。

注意：3个宏C，RM和CPP的原因是执行该名称的正确文件。因此，这些宏包含正确文件的路径。

请注意，如果源代码需要执行不同的操作，则可以使用编译参数-D32_BIT和-D64_BIT，具体取决于底层架构。

注意答案显示<tab>，在实际的makefile中，替换为实际的制表符

在Make中使用CMake

FindSDL2.cmake

FindSDL2_ttf.cmake

FindSDL2_image.cmake

5 个答案: