如何为 32 位和 64 位创建单个 makefile? [英] How do I create a single makefile for both 32- and 64-bit?

问题描述

我有一个 makefile 可以透明地用于 Linux (x86_64) 和 OS X Intel (x86_64).这使用 64 位特定的 GCC 选项.

I have a makefile that works transparently for Linux (x86_64) and OS X Intel (x86_64). This uses 64-bit specific GCC options.

有没有办法调整 makefile 以便我可以为 32 位和 64 位 OS X PPC(ppc、ppc64)构建而无需维护单独的、特定于架构的 makefile——也许类似于可以在构建之前确定架构的预处理器指令?

Is there a way to adjust the makefile so that I could build for 32-bit and 64-bit OS X PPC (ppc, ppc64) without having to maintain separate, arch-specific makefiles — perhaps something like a pre-processor directive that can determine the architecture before building?

推荐答案

ARCH := $(shell getconf LONG_BIT)

CPP_FLAGS_32 := -D32_BIT ...  Some 32 specific compiler flags ...
CPP_FLAGS_64 := -D64_BIT

CPP_FLAGS := $(CPP_FLAGS_$(ARCH))  ... all the other flags ...

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