Android can't include linux in C program with Android.mk

问题

I'm trying to compile a C program for Android 6. This is my Android.mk:

APP_PLATFORM := android-23
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
# Enable PIE manually. Will get reset on $(CLEAR_VARS). This
# is what enabling PIE translates to behind the scenes.
LOCAL_CFLAGS += -fPIE -DHAVE_FANOTIFY=1 -DHAVE_SYS_FANOTIFY=0
LOCAL_LDFLAGS += -fPIE -pie
# give module name
LOCAL_MODULE := fsmon
# list your C files to compile
LOCAL_SRC_FILES := inotify.c fanotify.c util.c main.c
# this option will build executables instead of building library for android application.
include $(BUILD_EXECUTABLE)

In the fanotify.c following include is written:

#include <linux/fanotify.h>

When I try to use ndk-build, following error appears:

fsmon/jni/fanotify.c:51:10: fatal error: 'linux/fanotify.h' file not found
#include <linux/fanotify.h>
         ^

The header fanotify.h is present in the ndk path /Android/Sdk/ndk-bundle/sysroot/usr/include/linux

Any suggestions?

EDIT: Same error if I try to include sys/fanotify.h

回答1:

You can specify additional include paths for your module using LOCAL_C_INCLUDES.

LOCAL_C_INCLUDES := /Android/Sdk/ndk-bundle/sysroot/usr/include/

https://developer.android.com/ndk/guides/android_mk.html#mdv

回答2:

The NDK historically didn't backport headers to old releases, but we've reworked things in r14 so this is possible: https://android.googlesource.com/platform/ndk/+/ndk-r14-release/docs/UnifiedHeaders.md

By default in r14 you still get the old form of the headers. The new "unified headers" have the headers you're looking for. If you want to try unified headers, set APP_UNIFIED_HEADERS := true in your Application.mk (settings for other build systems can be found in the link above).

In r15 (first beta due out soon), the default has changed to the new headers, and the option for disabling them has changed (see the same doc in r15 for changes in options: https://android.googlesource.com/platform/ndk/+/ndk-r15-release/docs/UnifiedHeaders.md).

来源：https://stackoverflow.com/questions/43124522/android-cant-include-linux-in-c-program-with-android-mk

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android

android-ndk

android.mk