Probably, you can use PLATFORM_VERSION
and/or PLATFORM_SDK_VERSION
, please see version_defaults.mk
Finding out Android's version in AOSP on native code compile time?
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30-05-2022 - |
Question
I am building AOSP for a device. Is there a way to get the current AOSP version at native code compile time? I am looking for something similar to the LINUX_VERSION_CODE and KERNEL_VERSION(X,Y,Z) directives in Linux. More specifically, I would like to do something that looks like this in one of my own AOSP add-on projects:
#if (ANDROID_VERSION_CODE >= ANDROID_VERSION(4,2,1))
... compile something ...
#else
... compile something else...
#endif
Solution
OTHER TIPS
The PLATFORM_VERSION is defined in the AOSP build directory:
build/core/version_defaults.mk:
ifeq "" "$(PLATFORM_VERSION)"
# This is the canonical definition of the platform version,
# which is the version that we reveal to the end user.
# Update this value when the platform version changes (rather
# than overriding it somewhere else). Can be an arbitrary string.
PLATFORM_VERSION := 5.1
endif
In a makefile of your product (or anywhere else) define the following make variables and pass them as macros to the compiler:
# Passing Android version to C compiler
PLATFORM_VERSION_MAJOR := $(word 1, $(subst ., ,$(PLATFORM_VERSION)))
PLATFORM_VERSION_MINOR := $(word 2, $(subst ., ,$(PLATFORM_VERSION)))
PLATFORM_VERSION_REVISION := $(word 3, $(subst ., ,$(PLATFORM_VERSION)))
COMMON_GLOBAL_CFLAGS += -DPLATFORM_VERSION_MAJOR=$(PLATFORM_VERSION_MAJOR) \
-DPLATFORM_VERSION_MINOR=$(PLATFORM_VERSION_MINOR)
ifneq ($(PLATFORM_VERSION_REVISION),)
COMMON_GLOBAL_CFLAGS += -DPLATFORM_VERSION_REVISION=$(PLATFORM_VERSION_REVISION)
endif
Define a header file with the version code:
android_version.h:
#define ANDROID_VERSION(major, minor, rev) \
((rev) | (minor << 8) | (major << 16))
#ifndef PLATFORM_VERSION_REVISION
#define PLATFORM_VERSION_REVISION 0
#endif
#define ANDROID_VERSION_CODE ANDROID_VERSION( \
PLATFORM_VERSION_MAJOR, \
PLATFORM_VERSION_MINOR, \
PLATFORM_VERSION_REVISION)
Now, to make compile time decisions based on android version simply include the android_version.h file and use pre-processer #if's.