什么predefined宏我可以用它来检测锵的目标架构？ [英] What predefined macro can I use to detect the target architecture in Clang?

问题描述

我想这取决于写code中的目标架构是如ARMv7的，armv7s或arm64。

I would like to write code depending on whether the target architecture is e.g. armv7, armv7s, or arm64.

这是我不能使用的原因<一href=\"http://stackoverflow.com/questions/19859388/how-can-i-get-the-ios-device-cpu-architecture-in-runtime\">sysctlbyname是，这会给我的底层架构在运行，但是当arm64例如模拟的ARMv7，sysctl的（貌似）仍然报告arm64。

The reason that I can't use sysctlbyname is that this would give me the underlying architecture at runtime, but when arm64 e.g. simulates armv7, sysctl (seemingly) still reports arm64.

推荐答案

铛--target = ... = -mcpu ... -E - -dM＆LT;的/ dev / null的将输出所有的pre-定义preprocessor宏（海合会类似的作品，太）

clang --target=... -mcpu=... -E - -dM </dev/null will output all the pre-defined preprocessor macros (similar works for gcc, too)

我不明白单宏给出了答案，但你也许可以用__ ARM_ARCH 的组合和规定（__ ARM_ARCH _ *）。

I don't see single macro that provides the answer, but you can probably use some combination of __ARM_ARCH and defined(__ARM_ARCH_*).

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