使用 glew 和 glfw 的 opengl 的 cmake 标志

发布于 2024-11-27 10:23:16 字数 1803 浏览 2 评论 0原文

我有这个简单的代码：

#include <stdio.h>
#include <stdlib.h>

#include <GL/glew.h>
#include <GL/glfw.h>

int main(int argc, char const* argv[] )
{
    if( !glfwInit() ){
        fprintf( stderr, "failed\n" );
    }

    return 0;
}

在我的 CmakeLists.txt 中：

PROJECT(test C)
find_package(OpenGL)
ADD_DEFINITIONS(
    -std=c99
    -lGL
    -lGLU
    -lGLEW
    -lglfw
)
SET(SRC test)
ADD_EXECUTABLE(test ${SRC})

运行“cmake”。不会产生任何错误，但运行 make 会显示：

test.c:(.text+0x10): undefined reference to `glfwInit'
collect2: ld returned 1 exit status
make[2]: *** [tut1] Error 1

while running:

gcc -o test test.c -std=c99 -lGL -lGLU -lGLEW -lglfw

成功编译代码，没有错误。如何让 cmake 运行我的代码？

另外，如果我将这些行添加到主函数中：

glfwOpenWindowHint( GLFW_FSAA_SAMPLES, 4 );
glfwOpenWindowHint( GLFW_OPENGL_VERSION_MAJOR, 3 );
glfwOpenWindowHint( GLFW_OPENGL_VERSION_MINOR, 1 );
glfwOpenWindowHint( GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE );

即使使用相同的标志运行 gcc 也会产生错误：

test.c: In function ‘main’:
test.c:14: error: ‘GLFW_OPENGL_VERSION_MAJOR’ undeclared (first use in this function)
test.c:14: error: (Each undeclared identifier is reported only once
test.c:14: error: for each function it appears in.)
test.c:15: error: ‘GLFW_OPENGL_VERSION_MINOR’ undeclared (first use in this function)
test.c:16: error: ‘GLFW_OPENGL_PROFILE’ undeclared (first use in this function)
test.c:16: error: ‘GLFW_OPENGL_CORE_PROFILE’ undeclared (first use in this function)

我正在运行基于 kubuntu 10.04、cmake v2.8、libglfw-dev、libglfw2、libglew1.5、libglew1 的 linux mint .5-dev、glew-utils。

我是 cmake、glew 和 glfw 的新手。谢谢你们的帮助！

干杯！

磷

原文

I have this simple code:

#include <stdio.h>
#include <stdlib.h>

#include <GL/glew.h>
#include <GL/glfw.h>

int main(int argc, char const* argv[] )
{
    if( !glfwInit() ){
        fprintf( stderr, "failed\n" );
    }

    return 0;
}

and in my CmakeLists.txt:

PROJECT(test C)
find_package(OpenGL)
ADD_DEFINITIONS(
    -std=c99
    -lGL
    -lGLU
    -lGLEW
    -lglfw
)
SET(SRC test)
ADD_EXECUTABLE(test ${SRC})

running "cmake ." doesn't produce any error, but running make will says:

test.c:(.text+0x10): undefined reference to `glfwInit'
collect2: ld returned 1 exit status
make[2]: *** [tut1] Error 1

while running:

gcc -o test test.c -std=c99 -lGL -lGLU -lGLEW -lglfw

successfully compiles the code without error. How do i make cmake run with my code?

also, if i add these lines to the main function:

glfwOpenWindowHint( GLFW_FSAA_SAMPLES, 4 );
glfwOpenWindowHint( GLFW_OPENGL_VERSION_MAJOR, 3 );
glfwOpenWindowHint( GLFW_OPENGL_VERSION_MINOR, 1 );
glfwOpenWindowHint( GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE );

even running gcc with the same flags will produce error:

test.c: In function ‘main’:
test.c:14: error: ‘GLFW_OPENGL_VERSION_MAJOR’ undeclared (first use in this function)
test.c:14: error: (Each undeclared identifier is reported only once
test.c:14: error: for each function it appears in.)
test.c:15: error: ‘GLFW_OPENGL_VERSION_MINOR’ undeclared (first use in this function)
test.c:16: error: ‘GLFW_OPENGL_PROFILE’ undeclared (first use in this function)
test.c:16: error: ‘GLFW_OPENGL_CORE_PROFILE’ undeclared (first use in this function)

i'm running linux mint based on kubuntu 10.04, cmake v2.8, libglfw-dev, libglfw2, libglew1.5, libglew1.5-dev, glew-utils.

I'm new to cmake, glew and glfw. Thanks for your help guys!

cheers!

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财迷小姐 2024-12-04 10:23:17

要查看 CMake 生成的 makefile 正在执行的命令，请运行 make：

make VERBOSE=1

在调试 CMake 项目时查看命令非常有帮助。对于提供的示例，执行以下命令：

/usr/bin/gcc -std=c99 -lGL -lGLU -lGLEW -lglfw -o CMakeFiles/test.dir/test.c.o -c test.c
/usr/bin/gcc CMakeFiles/test.dir/test.o -o test -rdynamic

CMake 生成的 makefile 会将每个源文件单独编译为目标文件（这就是 gcc -c 所做的），然后链接所有对象文件与单独的命令一起。在提供的示例中，OpenGL 相关库是在编译阶段指定的，而不是在链接阶段指定的。应使用 target_link_libraries 命令，而不是使用 add_definitions 指定库。

像这样的 CMakeLists.txt 文件应该可以工作：

cmake_minimum_required(VERSION 2.8)
project(test C)
add_definitions(-std=c99)
set(SRC test.c)
add_executable(test ${SRC})
target_link_libraries(test GL GLU GLEW glfw)

不需要为库指定 -l 前缀，因为 target_link_libraries 将自动添加 -l 前缀适用于 UNIX/Linux 环境，.lib 扩展适用于 Windows 环境。有关 target_link_libraries 的更多信息，请访问 http://www.cmake.org/cmake/help/cmake-2-8-docs.html#command:target_link_libraries

To see the commands that the CMake generated makefile is executing, run make as:

make VERBOSE=1

Seeing the commands is very helpful when debugging CMake projects. For the example provided, the following commands are executed:

/usr/bin/gcc -std=c99 -lGL -lGLU -lGLEW -lglfw -o CMakeFiles/test.dir/test.c.o -c test.c
/usr/bin/gcc CMakeFiles/test.dir/test.o -o test -rdynamic

The makefiles generated by CMake will compile each source file into an object file (this is what gcc -c does) individually, and then link all of the object files together with a separate command. With the provided example, the OpenGL related libraries are being specified during the compilation stage, and not during the link stage. Instead of specifying the libraries with add_definitions, the target_link_libraries command should be used.

A CMakeLists.txt file like this should work:

cmake_minimum_required(VERSION 2.8)
project(test C)
add_definitions(-std=c99)
set(SRC test.c)
add_executable(test ${SRC})
target_link_libraries(test GL GLU GLEW glfw)

The -l prefix does not need to be specified for the libraries because target_link_libraries will automatically add the -l prefix for UNIX/Linux environments and the .lib extension for Windows environments. More information about target_link_libraries can be found at http://www.cmake.org/cmake/help/cmake-2-8-docs.html#command:target_link_libraries

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