如何检测GHC是否设置为默认生成32位或64位代码？ [英] How can I detect if GHC is set to generate 32bit or 64bit code by default?

问题描述

我在 makefile 中有以下几点：

  GLFW_FLAG：= -m32 -O2 -Iglfw / include -Iglfw / lib -Iglfw / lib / cocoa $（CFLAGS）
 ... 
 $（BUILD_DIR）/％。o：％.c 
 $（CC）-c $（GLFW_FLAG）$< -o $ @ 
 $（BUILD_DIR）/％。o：％.m 
 $（CC）-c $（GLFW_FLAG）$< -o $ @ 
  

-m32 指示GCC生成32位代码。这是因为在某些配置中，GHC被设置为构建32位代码，但GCC的默认设置有时是64位。我想概括一下，以便自动检测GHC是在构建32位还是64位代码，然后将正确的标记传递给GCC。

问题 ：我怎么能问GHC它将构建什么类型的代码（32位与64位）？

PS：我的cabal文件在生成过程中调用此makefile以解决阴谋。我希望我可以在我的cabal文件中列出它们作为c源代码。

感谢Ed'ka，我知道现在正确答案。

Makefile现在有这样一个规则：

  GCCFLAGS：= $（shell ghc --info | ghc -efmap read getContents>> = putStrLn。unwords。read。Data.Maybe.fromJust。lookup \Gcc Linker flags\）
  

它有点长，但它所做的只是从ghc的输出中提取Gcc链接器标志。 注意：这是 ghc --info 的输出，而不是 ghc + RTS --info 。

这比其他建议的方式更好，因为它可以让我 all 被指定，而不仅仅是-m标志。没有标志时也是空的。

谢谢大家！

I have the following bits in my makefile:

GLFW_FLAG := -m32 -O2 -Iglfw/include -Iglfw/lib -Iglfw/lib/cocoa $(CFLAGS)
...
$(BUILD_DIR)/%.o : %.c
    $(CC) -c $(GLFW_FLAG) $< -o $@
$(BUILD_DIR)/%.o : %.m
    $(CC) -c $(GLFW_FLAG) $< -o $@

The -m32 instructs GCC to generate 32bit code. It's there because on some configurations GHC is set to build 32bit code but GCC's default is sometimes 64bit. I would like to generalize this so that it autodetects whether GHC is building 32bit or 64bit code and then passes the correct flag to GCC.

Question: How can I ask GHC what type of code (32bit vs. 64bit) it will build?

PS: My cabal file calls this makefile during the build to workaround limitations in cabal. I do wish I could just list these as c-sources in my cabal file.

解决方案

Thanks to Ed'ka I know the correct answer now.

The Makefile now has a rule like this:

GCCFLAGS  := $(shell ghc --info | ghc -e "fmap read getContents >>= putStrLn . unwords . read . Data.Maybe.fromJust . lookup \"Gcc Linker flags\"")

It's a bit long, but all it does is extract the "Gcc Linker flags" from ghc's output. Note: This is the output of ghc --info and not ghc +RTS --info.

This is better than the other suggested ways as it gives me all the flags that need to be specified and not just the -m flag. It's also empty when no flags are needed.

Thank you everyone!

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