英文:
Doesn't "go get" just fetch files and then cgo+"go build" them? Apparently not
问题
我在构建一个相当简单的本地CGO项目时遇到了问题。考虑这个非常小的CGO包，它只有3个文件（glut.go，support.c和support.h文件）--如果我只是go get它，这些文件会下载到
C:\Go\src\pkg\github.com\zombiezen\Go-GLUT\glut
然后一些秘密的魔法发生，go get会构建以下输出文件：
C:\Go\pkg\windows_amd64\github.com\zombiezen\Go-GLUT\glut.a
然而，如果我将这三个源文件复制到\mytmp，进入\mytmp并执行go build -o glut.a glut.go，我会得到大约40-60个类似于以下错误消息的错误：
C:\Users\roxor\AppData\Local\Temp\go-build191975110\command-line-arguments\_obj\glut.cgo2.o: In function `_cgo_b46885fb7c57_Cfunc_goCreateMenu':
./glut.go:195: undefined reference to `goCreateMenu'
如果我使用**-x命令行参数运行go get**，我可以看到在构建过程中会捕获到support.c并交给gcc：
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
然而，使用go build -x时，情况并非如此，support.c被跳过了。为什么？我该如何调用go build以使其与go get完全相同？
英文:
I have a problem building a fairly simple local CGO project. Consider this very small CGO package of just 3 files (glut.go, support.c and support.h file) -- if I just go get it, these files are downloaded to
C:\Go\src\pkg\github.com\zombiezen\Go-GLUT\glut
then some secret magic happens and go get builds the following output file:
C:\Go\pkg\windows_amd64\github.com\zombiezen\Go-GLUT\glut.a
However, if I copy the three source files to \mytmp, cd into \mytmp and go build -o glut.a glut.go, I get some 40-60 error messages like this one:
C:\Users\roxor\AppData\Local\Temp\go-build191975110\command-line-arguments\_obj\glut.cgo2.o: In function `_cgo_b46885fb7c57_Cfunc_goCreateMenu':
./glut.go:195: undefined reference to `goCreateMenu'
If I run go get with the -x command-line argument, I can see that support.c is picked up during the build process and given to gcc:
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
However, with go build -x, this is not the case, support.c is skipped. Why? How do I call go build to work exactly like go get does?
答案1
得分: 0
只需要执行go build而不是go build somefile.go就可以了。现在看起来是如此明显...
英文:
Just doing go build instead of go build somefile.go does it. So obvious now …
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