哪些库需要使用块链接到一个铛程序 [英] Which libraries do you need to link against for a clang program using blocks

问题描述

我发现（下面），我需要在编译使用块的代码时使用-fblocks。

I've discovered (below) that I need to use -fblocks when compiling code which uses blocks.

我需要链接的库，链接器解析_NSConcreteStackBlock？ （在Ubuntu 9.10 AMD64上）

What library do I need to link against to let the linker resolve _NSConcreteStackBlock? (On Ubuntu 9.10 AMD64.)

chris@chris-desktop:~$ clang ctest.c 

ctest.c:3:25: error: blocks support disabled - compile with -fblocks or pick a
      deployment target that supports them
void call_a_block(void (^blockptr)(int)) {
                        ^
ctest.c:11:19: error: blocks support disabled - compile with -fblocks or pick a
      deployment target that supports them
    call_a_block( ^(int y) { 
                  ^
2 diagnostics generated.
chris@chris-desktop:~$ clang ctest.c -fblocks
/tmp/cc-4sPSeO.o: In function `main':
ctest.c:(.text+0x79): undefined reference to `_NSConcreteStackBlock'
collect2: ld returned 1 exit status
clang: error: linker command failed with exit code 1 (use -v to see invocation)

推荐答案

Clang尚未提供在没有内置操作系统支持的平台上使用块的简单方法（例如，SnowLeopard）。您可以在这里找到有关libdispatch项目的更多信息：
http://libdispatch.macosforge.org/
和编译器-r项目（提供块运行时）：
http://compiler-rt.llvm.org/
，但这对于Clang最终用户还不是很好的打包。

Clang doesn't yet provide an easy way to use blocks on platforms that don't have built-in operating system support (e.g., SnowLeopard). You can find some more information on the libdispatch project here: http://libdispatch.macosforge.org/ and on the compiler-rt project (which provides the blocks runtime) here: http://compiler-rt.llvm.org/ but this is not yet well packaged for Clang end users.

如果你想要挖一点，编译器rt项目确实有它的块运行时，你可以使用它来构建一个库，将提供NSConcreteStackBlock。

If you want to dig in a bit, the compiler-rt project does have the blocks runtime in it, and you can use that to build a library which will provide the NSConcreteStackBlock.

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