24

（非常详细的问题报告——tl;dr 在底部！）

我真的更喜欢 GLFW 而不是 Glut，并且希望它的Golang 绑定在 Windows 64 位和 Go 1.0.1 64 位下工作。在 Linux 下，它的绑定工作完美无缺。这在 Windows 下原则上是可行的——GitHub 用户 chsc已经设法做到了，但他在 Win32 上，他的提示还没有解决我的问题。但是我确实有一个基于 tdm64-gcc-4.6.1 的完整而干净的 Mingw64 设置。

现在奇怪的是——让 freeglut 绑定在 64 位 Windows 下工作，64 位 Go 1.0.1工作——glfw 绑定对我来说失败了。我想弄清楚为什么，因为它们本质上都使用相同的 cgo 特性和技术。

注意我目前有一个自制的半生不熟但基本上可以工作的替换包，它使用 LoadLibrary/GetProcAddress 调用在 Go 中公开 glfw.dll。这可行，但我认为硬链接的编译 CGO 绑定比无数的 Syscall()、Syscall6()、Syscall9()、Syscall12() 等 Go func 调用更可取。如果 Win32 和 Linux gophers 可以拥有这个，为什么我们 Win64 的人不能呢？

所以这是我到目前为止的设置：

  1. 我有一个带有三个补丁的 Golang 构建，以使 lib 链接与 cgo应用一起工作
  2. 我已经使用 MinGW64 成功地将最新的 freeglut 和 GLFW 库编译为 64 位 DLL。
  3. 头文件glut.h、freeglut*.h和glfw.h放在\MinGW64\x86_64-w64-mingw32\include\GL（gl.h、glaux.h、glu.h旁边）
  4. Lib 文件 libfreeglut.a 和 libglfwdll.a 放在 \MinGW64\x86_64-w64-mingw32\lib （在 libglu32.a、libopengl32.a 旁边）
  5. 64 位 DLL glfw.dll 和 freeglut64.dll 被放置在 \windows 和 \windows\system32 中（在 opengl32.dll、glu32.dll 旁边）
  6. 我相信freeglut64.dll 和 glfw.dll都可以工作——至少他们的大多数示例程序在安装 DLL 后都可以工作。

一切都应该到位，对吧？现在首先要成功绑定（我不需要），freeglut - 当我去 get -x github.com/zombiezen/Go-GLUT/glut时，一切都构建得很好，我可以成功创建一个过剩窗口和在从 .go 源文件编译的 Windows test.exe 中显示一个三角形。感谢 -x，go get 显示了它的构建功能：

WORK=C:\Users\roxor\AppData\Local\Temp\go-build292908674
mkdir -p $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\
cd C:\Go\src\pkg\github.com\zombiezen\Go-GLUT\glut
C:\Go\pkg\tool\windows_amd64\cgo.exe -objdir $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\ -- -I $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\ glut.go
C:\Go\pkg\tool\windows_amd64\6c.exe -FVw -I $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\ -I C:\Go\pkg\windows_amd64 -o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_defun.6 -DGOOS_windows -DGOARCH_amd64 $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_defun.c
gcc -I . -g -O2 -m64 -mthreads -I $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\ -o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_main.o -c $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_main.c
gcc -I . -g -O2 -m64 -mthreads -I $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\ -o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_export.o -c $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_export.c
gcc -I . -g -O2 -m64 -mthreads -I $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\ -o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\glut.cgo2.o -c $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\glut.cgo2.c
gcc -I . -g -O2 -m64 -mthreads -I $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\ -o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\support.o -c .\support.c
gcc -I . -g -O2 -m64 -mthreads -o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_.o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_main.o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_export.o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\glut.cgo2.o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\support.o -lfreeglut
C:\Go\pkg\tool\windows_amd64\cgo.exe -objdir $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\ -dynimport $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_.o -dynout $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_import.c
C:\Go\pkg\tool\windows_amd64\6c.exe -FVw -I $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\ -I C:\Go\pkg\windows_amd64 -o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_import.6 -DGOOS_windows -DGOARCH_amd64 $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_import.c
gcc -I . -g -O2 -m64 -mthreads -o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_all.o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_export.o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\glut.cgo2.o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\support.o -Wl,-r -nostdlib -lgcc -lmingwex -lmingw32
C:\Go\pkg\tool\windows_amd64\6g.exe -o $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_go_.6 -p github.com/zombiezen/Go-GLUT/glut -D _/C_/Go/src/pkg/github.com/zombiezen/Go-GLUT/glut -I $WORK $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_gotypes.go $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\glut.cgo1.go
C:\Go\pkg\tool\windows_amd64\pack.exe grc $WORK\github.com\zombiezen\Go-GLUT\glut.a $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_go_.6 $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_import.6 $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_cgo_defun.6 $WORK\github.com\zombiezen\Go-GLUT\glut\_obj\_all.o
mkdir -p C:\Go\pkg\windows_amd64\github.com\zombiezen\Go-GLUT\
cp $WORK\github.com\zombiezen\Go-GLUT\glut.a C:\Go\pkg\windows_amd64\github.com\zombiezen\Go-GLUT\glut.a

为了达到这一点，我不得不稍微修改一下 glut.go 如下：

// # include <GL/glut.h>
// #cgo windows LDFLAGS: -lfreeglut
// #include <stdlib.h>
// #include "support.h"
import "C"

因此，总而言之，这构建得很好，可以从 Go 导入和链接并在代码中使用。

现在为 GLFW。GO 文件的内容与 glut.go 极为相似：

//#cgo windows LDFLAGS: -lglfwdll -lglu32 -lopengl32
//#include <stdlib.h>
//#define GLFW_DLL
//#include <GL/glfw.h>
import "C"

#define GLFW_DLL不会发生静态链接。这是go get -x github.com/jteeuwen/glfw的输出：

WORK=C:\Users\roxor\AppData\Local\Temp\go-build499107422
mkdir -p $WORK\github.com\jteeuwen\glfw\_obj\
cd C:\Go\src\pkg\github.com\jteeuwen\glfw
C:\Go\pkg\tool\windows_amd64\cgo.exe -objdir $WORK\github.com\jteeuwen\glfw\_obj\ -- -I $WORK\github.com\jteeuwen\glfw\_obj\ callback.go glfw.go image.go vidmode.go
C:\Go\pkg\tool\windows_amd64\6c.exe -FVw -I $WORK\github.com\jteeuwen\glfw\_obj\ -I C:\Go\pkg\windows_amd64 -o $WORK\github.com\jteeuwen\glfw\_obj\_cgo_defun.6 -DGOOS_windows -DGOARCH_amd64 $WORK\github.com\jteeuwen\glfw\_obj\_cgo_defun.c
gcc -I . -g -O2 -m64 -mthreads -I $WORK\github.com\jteeuwen\glfw\_obj\ -o $WORK\github.com\jteeuwen\glfw\_obj\_cgo_main.o -c $WORK\github.com\jteeuwen\glfw\_obj\_cgo_main.c
gcc -I . -g -O2 -m64 -mthreads -I $WORK\github.com\jteeuwen\glfw\_obj\ -o $WORK\github.com\jteeuwen\glfw\_obj\_cgo_export.o -c $WORK\github.com\jteeuwen\glfw\_obj\_cgo_export.c
gcc -I . -g -O2 -m64 -mthreads -I $WORK\github.com\jteeuwen\glfw\_obj\ -o $WORK\github.com\jteeuwen\glfw\_obj\callback.cgo2.o -c $WORK\github.com\jteeuwen\glfw\_obj\callback.cgo2.c
gcc -I . -g -O2 -m64 -mthreads -I $WORK\github.com\jteeuwen\glfw\_obj\ -o $WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o -c $WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.c
gcc -I . -g -O2 -m64 -mthreads -I $WORK\github.com\jteeuwen\glfw\_obj\ -o $WORK\github.com\jteeuwen\glfw\_obj\image.cgo2.o -c $WORK\github.com\jteeuwen\glfw\_obj\image.cgo2.c
gcc -I . -g -O2 -m64 -mthreads -I $WORK\github.com\jteeuwen\glfw\_obj\ -o $WORK\github.com\jteeuwen\glfw\_obj\vidmode.cgo2.o -c $WORK\github.com\jteeuwen\glfw\_obj\vidmode.cgo2.c
gcc -I . -g -O2 -m64 -mthreads -I $WORK\github.com\jteeuwen\glfw\_obj\ -o $WORK\github.com\jteeuwen\glfw\_obj\callback.o -c .\callback.c
gcc -I . -g -O2 -m64 -mthreads -o $WORK\github.com\jteeuwen\glfw\_obj\_cgo_.o $WORK\github.com\jteeuwen\glfw\_obj\_cgo_main.o $WORK\github.com\jteeuwen\glfw\_obj\_cgo_export.o $WORK\github.com\jteeuwen\glfw\_obj\callback.cgo2.o $WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o $WORK\github.com\jteeuwen\glfw\_obj\image.cgo2.o $WORK\github.com\jteeuwen\glfw\_obj\vidmode.cgo2.o $WORK\github.com\jteeuwen\glfw\_obj\callback.o -lglfwdll -lglu32 -lopengl32
# github.com/jteeuwen/glfw
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetNumberOfProcessors':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:39: undefined reference to `__imp_glfwGetNumberOfProcessors'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetKey':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:51: undefined reference to `__imp_glfwGetKey'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwSetTime':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:60: undefined reference to `__imp_glfwSetTime'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwExtensionSupported':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:71: undefined reference to `__imp_glfwExtensionSupported'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwPollEvents':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:80: undefined reference to `__imp_glfwPollEvents'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetMousePos':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:90: undefined reference to `__imp_glfwGetMousePos'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetJoystickParam':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:102: undefined reference to `__imp_glfwGetJoystickParam'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetProcAddress':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:112: undefined reference to `__imp_glfwGetProcAddress'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetGLVersion':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:123: undefined reference to `__imp_glfwGetGLVersion'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwSetMouseWheel':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:133: undefined reference to `__imp_glfwSetMouseWheel'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetJoystickPos':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:148: undefined reference to `__imp_glfwGetJoystickPos'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwOpenWindow':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:168: undefined reference to `__imp_glfwOpenWindow'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwSetMousePos':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:178: undefined reference to `__imp_glfwSetMousePos'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwSwapInterval':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:188: undefined reference to `__imp_glfwSwapInterval'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetMouseButton':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:209: undefined reference to `__imp_glfwGetMouseButton'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwSetWindowTitle':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:218: undefined reference to `__imp_glfwSetWindowTitle'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetVideoModes':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:231: undefined reference to `__imp_glfwGetVideoModes'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetJoystickButtons':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:246: undefined reference to `__imp_glfwGetJoystickButtons'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwRestoreWindow':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:255: undefined reference to `__imp_glfwRestoreWindow'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwInit':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:265: undefined reference to `__imp_glfwInit'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwSwapBuffers':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:274: undefined reference to `__imp_glfwSwapBuffers'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetMouseWheel':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:284: undefined reference to `__imp_glfwGetMouseWheel'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwIconifyWindow':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:293: undefined reference to `__imp_glfwIconifyWindow'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwWaitEvents':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:302: undefined reference to `__imp_glfwWaitEvents'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwSetWindowPos':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:312: undefined reference to `__imp_glfwSetWindowPos'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetWindowSize':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:322: undefined reference to `__imp_glfwGetWindowSize'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwDisable':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:332: undefined reference to `__imp_glfwDisable'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetWindowParam':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:344: undefined reference to `__imp_glfwGetWindowParam'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwCloseWindow':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:353: undefined reference to `__imp_glfwCloseWindow'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwOpenWindowHint':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:363: undefined reference to `__imp_glfwOpenWindowHint'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwSleep':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:372: undefined reference to `__imp_glfwSleep'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwEnable':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:382: undefined reference to `__imp_glfwEnable'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwSetWindowSize':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:392: undefined reference to `__imp_glfwSetWindowSize'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwTerminate':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:411: undefined reference to `__imp_glfwTerminate'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetDesktopMode':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:420: undefined reference to `__imp_glfwGetDesktopMode'
$WORK\github.com\jteeuwen\glfw\_obj\glfw.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwGetTime':
C:\Go\src\pkg\github.com\jteeuwen\glfw/glfw.go:429: undefined reference to `__imp_glfwGetTime'
$WORK\github.com\jteeuwen\glfw\_obj\image.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwFreeImage':
C:\Go\src\pkg\github.com\jteeuwen\glfw/image.go:38: undefined reference to `__imp_glfwFreeImage'
$WORK\github.com\jteeuwen\glfw\_obj\image.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwReadImage':
C:\Go\src\pkg\github.com\jteeuwen\glfw/image.go:52: undefined reference to `__imp_glfwReadImage'
$WORK\github.com\jteeuwen\glfw\_obj\image.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwLoadTextureImage2D':
C:\Go\src\pkg\github.com\jteeuwen\glfw/image.go:65: undefined reference to `__imp_glfwLoadTextureImage2D'
$WORK\github.com\jteeuwen\glfw\_obj\image.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwLoadMemoryTexture2D':
C:\Go\src\pkg\github.com\jteeuwen\glfw/image.go:78: undefined reference to `__imp_glfwLoadMemoryTexture2D'
$WORK\github.com\jteeuwen\glfw\_obj\image.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwLoadTexture2D':
C:\Go\src\pkg\github.com\jteeuwen\glfw/image.go:91: undefined reference to `__imp_glfwLoadTexture2D'
$WORK\github.com\jteeuwen\glfw\_obj\image.cgo2.o: In function `_cgo_680190d759a2_Cfunc_glfwReadMemoryImage':
C:\Go\src\pkg\github.com\jteeuwen\glfw/image.go:107: undefined reference to `__imp_glfwReadMemoryImage'
$WORK\github.com\jteeuwen\glfw\_obj\callback.o: In function `setWindowSizeCB':
C:/Go/src/pkg/github.com/jteeuwen/glfw/callback.c:9: undefined reference to `__imp_glfwSetWindowSizeCallback'
$WORK\github.com\jteeuwen\glfw\_obj\callback.o: In function `setWindowCloseCB':
C:/Go/src/pkg/github.com/jteeuwen/glfw/callback.c:14: undefined reference to `__imp_glfwSetWindowCloseCallback'
$WORK\github.com\jteeuwen\glfw\_obj\callback.o: In function `setWindowRefreshCB':
C:/Go/src/pkg/github.com/jteeuwen/glfw/callback.c:19: undefined reference to `__imp_glfwSetWindowRefreshCallback'
$WORK\github.com\jteeuwen\glfw\_obj\callback.o: In function `setMouseButtonCB':
C:/Go/src/pkg/github.com/jteeuwen/glfw/callback.c:24: undefined reference to `__imp_glfwSetMouseButtonCallback'
$WORK\github.com\jteeuwen\glfw\_obj\callback.o: In function `setMousePosCB':
C:/Go/src/pkg/github.com/jteeuwen/glfw/callback.c:29: undefined reference to `__imp_glfwSetMousePosCallback'
$WORK\github.com\jteeuwen\glfw\_obj\callback.o: In function `setMouseWheelCB':
C:/Go/src/pkg/github.com/jteeuwen/glfw/callback.c:34: undefined reference to `__imp_glfwSetMouseWheelCallback'
$WORK\github.com\jteeuwen\glfw\_obj\callback.o: In function `setKeyCB':
C:/Go/src/pkg/github.com/jteeuwen/glfw/callback.c:39: undefined reference to `__imp_glfwSetKeyCallback'
$WORK\github.com\jteeuwen\glfw\_obj\callback.o: In function `setCharCB':
C:/Go/src/pkg/github.com/jteeuwen/glfw/callback.c:44: undefined reference to `__imp_glfwSetCharCallback'
collect2: ld returned 1 exit status

是的，这是一个拗口——但基本上总是同样的错误，而且在构建过程中相当晚。请注意，如果未定义#define GLFW_DLL，我将得到基本相同的输出，除了没有 __imp_ 前缀——静态链接既不鼓励 Go，也不适合这个特定用例。

现在，当 gcc 抱怨“未定义的引用”时，从我的谷歌搜索来看，可能有各种原因......

  • 找不到 DLL 不可能是失败的——它们在适当的位置，对于 freeglut64.dll 它可以工作
  • 不可能找不到 .a 库——它们位于适当的位置，并且 libfreeglut.a 有效，如果我将 -lglfwdll 更改为 -lblafoobar 则 gcc 会更早失败并正确地抱怨“找不到 blafoobar”——所以它确实找到了 libglfwdll.a。
  • lib依赖的顺序？我尝试将 -lglfwdll 作为第一个库（在 -lglu32 -lopengl32 之前）和作为最后一个库（在这两个库之后），没有区别。
  • Golang glfw 绑定有问题吗？不这么认为，适用于其他人，包括在 Windows 下用于 chsc（虽然是 32 位）

TL;DR——在 Windows 64 位、Go 1.0.1 64 位完全修补下，CGO 成功生成内容以供freeglut 和 glfw输入GCC。然后 GCC 很高兴地吃掉这些东西来构建 freeglut 绑定，但拒绝它来构建 glfw 绑定，所有 C.funcs() 都有“未定义的引用”。libfreeglut 和 libglfwdll 都正确构建并安装为 64 位 DLL 和正确定位的 .h/.a 库。可能是什么原因？

4

3 回答 3

5

我已经有一段时间遇到完全相同的问题了，每次我解决上次尝试的挫败感时，我都在研究它。为 go 编译 32 位 glfw 没问题，但 64 位版本让我望而却步。

今天，在阅读了 kneo 的评论后，我尝试了他的解决方案，但无法让它发挥作用。但这让我看到了 libglfwdll.a 有 @nn stdcall 后缀，而 libglfw.a 没有它们。尝试各种 LDFLAGS (-Wl,--kill-at, -Wl,--enable-stdcall-fixup) 没有产生成功的结果，我研究了http://www.willus.com/mingw/yongweiwu_stdcall.html但不能不要让它工作。

当我决定查看是否有带有以下错误修复的新版本 glfw (2.7.6) 时，我正要放弃：

[Win32] Bugfix: A .def file using __stdcall naming conventions was used for the 64-bit DLL on MinGW-w64

so long story short, compiling the new glfw version and installing it fixed the issue and go get github.com/jteeuwen/glfw now works without any problem.

于 2012-07-06T13:34:34.497 回答
2

No longer an issue with the newest releases of Go, GLFW and Mingw-w64.

于 2012-10-11T19:36:18.517 回答
0

我能想到两种可能：

  1. 这些符号实际上不存在于库中。您可以使用nm. 确保符号类型是大写字母；如果只有小写代码，则库构建不正确。

  2. 你有一个循环依赖。即库 A 依赖于库 B，而库 B 又依赖于 A。您可以再次将库添加到命令中或使用链接器组（请参阅 参考资料ld --help）来解决这个问题。

请注意，命令行中库的顺序非常重要：链接器依次读取每个库，按照它们出现的顺序，搜索当时需要的符号，然后继续。如果符号首先由后期库引用，则链接器将不会重新访问早期库以查找定义。这就是为什么循环依赖是一个问题的原因。

于 2012-06-30T21:35:03.773 回答