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I want to build small library which was written in C99 for Android, but compiler gave log as
note: use option -std=c99 or -std=gnu99 to compile your code
Where can I set it?
218
Using Android Studio 2.2 and higher, you can use the NDK to compile C and C++ code into a native library and package it into your APK using Gradle, the IDE's integrated build system. Your Java code can then call functions in your native library through the Java Native Interface (JNI) framework.
$NDK/sysroot is the unified headers and is what you should be using when compiling. When linking, you should still be using $NDK/platforms/android-$API/arch-$ARCH . We do have a doc explaining how to use unified headers in a custom build system: android.googlesource.com/platform/ndk/+/master/docs/….
An addendum to auselen's answer:
According to the NDK docs (kandroid.org mirror), LOCAL_CFLAGS will only apply to each module - if you want this behavior across an entire project, set APP_CFLAGS in Application.mk. Also, CFLAGS will cover C and C++ sources, CPPFLAGS covers C++ only.
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In your Android.mk add
LOCAL_CFLAGS += -std=c99
For example:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_CFLAGS += -std=c99
LOCAL_SRC_FILES := com_example_ndktest_TestLib.c
LOCAL_MODULE := com_example_ndktest_TestLib
include $(BUILD_SHARED_LIBRARY)
Make sure you add 'LOCAL_CFLAGS' after adding 'include $(CLEAR_VARS)'
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