This article applies to Android only.
See also: Multiplatform Programming Guide
Support for the Android target is present starting from FPC 3.0.
- ARM (
- x86 (
- MIPS (
- JVM (not discussed on this page)
You need to download and install Android NDK in order to get the cross binutils that compile programs for the android target on your current machine.
Download Android NDK using this link: http://developer.android.com/tools/sdk/ndk/index.html
Extract it to some folder.
Check out the latest trunk sources of FPC using the following command:
svn co http://svn.freepascal.org/svn/fpc/trunk fpcsrc
Now you have the latest compiler sources in the fpcsrc sub-folder.
Building cross compiler
You need to have a working installation of FPC 2.6.2 compiler in order to create the cross-compiler.
This tutorial describes how to build a cross-compiler for the
arm-android target on Windows. But the tutorial can be applied to any system with small obvious modifications.
Use the similar approach to build a
Let's assume the following paths:
- Android NDK path:
C:\Program Files\Android SDK\android-ndk-r8d
- FPC svn sources path:
- The cross-compiler installation path:
Add path to Android binutils to the PATH environment variable. In this tutorial the path is:
C:\Program Files\Android SDK\android-ndk-r8d\toolchains\arm-linux-androideabi-4.7\prebuilt\windows\bin
Open the Command line prompt and
cd to the root of FPC sources folder:
Execute the following command:
make clean crossall crossinstall OS_TARGET=android CPU_TARGET=arm INSTALL_PREFIX=C:\Develop\FPC\pp
After that you should have the cross-compiler and units installed in folder
By default all units are built with -O2 optimization switch. Also software FPU emulation is used for ARM CPU by default. If you need to specify different compiler options for building, use the
CROSSOPT parameter. For example if you wish to build units with hardware FPU support use the following command:
make clean crossall crossinstall OS_TARGET=android CPU_TARGET=arm CROSSOPT="-CfVFPV3" INSTALL_PREFIX=C:\Develop\FPC\pp
Now create a new
fpc.cfg file in folder
C:\Develop\FPC\pp\bin\i386-win32 and paste into it the following text:
-FuC:\Develop\FPC\pp\units\$FPCTARGET\* #ifdef android #ifdef cpuarm -FlC:\Program Files\Android SDK\android-ndk-r8d\platforms\android-14\arch-arm\usr\lib #endif #ifdef cpu386 -FlC:\Program Files\Android SDK\android-ndk-r8d\platforms\android-14\arch-x86\usr\lib #endif #endif
Now, when the cross-compiler is ready, you can compile programs for the Android target:
C:\Develop\FPC\pp\bin\i386-win32\ppcrossarm -Tandroid testprog.pas
- The compiler does NOT define
LINUXduring compilation! It defines
(Background: Android is not completely Linux compatible, e.g. a few syscalls and default library functions e.g. in pthreads, ... are missing, and it generally behaves different in a few ways. This makes the amount of defines manageable by avoiding
if defined(linux) and not defined(android). Actually, the list of things that are different is only growing).
- Shared libraries do not have argc/argv available (i.e. set to 0 or nil) because of Android.
- The selection of compiled packages is mostly driven by what libraries are shipped by default on Android, i.e. not much.
Android for ARM
By default FPC generates
ARMv6 code for the
arm-android target, while 1.x and 2.x versions of Android support the
ARMv5T CPU. There have been few real devices with the
ARMv5T CPUs. But emulator images for Android 1.x and 2.x use
ARMv5T CPU. If need to test your application on old Android versions using the emulator or wish to support
ARMv5T devices, you need to build a arm-android cross compiler with the
- clocale unit is not implemented yet.
- Tutorial "Lazarus and Android" (PDF file)