按文件CPPFLAGS在Android.mk [英] Per-file CPPFLAGS in Android.mk

问题描述

我工作的一个Android.mk文件中，对于单个模块，其中一个文件需要不同的CPPFLAGS;即，它需要-frtti启用，而另一些则需要-fno-RTTI的Andr​​oid的默认值。

I'm working on an Android.mk file in which, for a single module, one of the files needs different CPPFLAGS; namely, it needs -frtti enabled, while others need the Android default of -fno-rtti.

显而易见的解决方案是目标特定的变量的，但奇怪的是，他们似乎并没有影响到编译，甚至有些摆弄为保证值应固定在正确的时间。

The obvious solution was target-specific variables, but oddly they do not seem to affect compilation, even with some fiddling to ensure the values should be fixed at the right time.

下面是从我的Andr​​oid.mk提取物（名称变更为保护我）：

Here's an extract from my Android.mk (names changed to protect me):

LOCAL_MODULE := foo_bar

LOCAL_SRC_FILES := \
    foo_bar.cpp \
    foo_baz.cpp

my_intermediates:= $(local-intermediates-dir)/foo_baz.o
$(my_intermediates): LOCAL_CPPFLAGS := -frtti

我已经尝试了简单地做 foo_baz.o：代替$（my_intermediates），并试图取代 + = 为：= 来没有变化。

I have tried simply doing foo_baz.o: in lieu of $(my_intermediates), and have tried substituting += for := to no change.

那么，有没有一个Android特定的方式来覆盖CPPFLAGS（或CFLAGS）特定的源文件？

So, is there an Android-specific way to override CPPFLAGS (or CFLAGS) for a specific source file?

（在这种情况下，我使用了Eclair的Andr​​oid的人士透露，尽管它可以向NDK;见我的回答，下同）

(In this case I'm using the Eclair Android sources, though it may apply to the NDK; see my answer, below.)

推荐答案

正如往常一样，问了它花费了大量的时间之后，我发现在很短的时间回答问题。我需要使用 PRIVATE_CPPFLAGS 而不是 LOCAL_CPPFLAGS 。

As is usual, having asked the question after spending a lot of time on it, I have found the answer in short order. I need to use PRIVATE_CPPFLAGS instead of LOCAL_CPPFLAGS.

不过，这只是似乎是为Android源代码分发的情况下（至少埃克莱尔）和NDK R6B。如果我是使用NDK R6，这很可能会担任它的立场。

However, this only appears to be the case for the Android source distribution (at least Eclair) and NDK r6b. If I was using NDK r6, this probably would have worked as it stands.

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