Re: 答复: How to build openjdk mobile project android platform successfully and how does the mobile project adapt to bionic C ?

[gary.adams at oracle.com]

The android compiler will set the __ANDROID__ build flag.
The __ANDROID__ workarounds are in the mobile repos.

 From the  LOG=debug output can you provide the command line
used to compile the file that is failing.

I'm not sure you have the right sources or toolchain setup.

On 8/25/18 2:15 AM, zhangfan (AZ) wrote:
> Hi,
>
> Thank you for your quick response.
> I tried the "make jre-image" command and failed in the same way.
> Do I need to enable the "__ANDROID__" manually? Because the build errors occur due to the use of the lacking functions the bionic doesn't provide.
>
>
> -----邮件原件-----
> 发件人: mobile-dev [mailto:mobile-dev-bounces at openjdk.java.net] 代表 gary.adams at oracle.com
> 发送时间: 2018年8月24日 18:45
> 收件人: guoge (A) <guoge1 at huawei.com>; mobile-dev at openjdk.java.net
> 抄送: xietuo <xietuo at huawei.com>
> 主题: Re: How to build openjdk mobile project android platform successfully and how does the mobile project adapt to bionic C ?
>
> Only the java runtime libraries were ported to run in the Android app environment.
> You can not build a full jdk image.
>
> The mobile repos already has the needed "#if defined(__ANDROID__) ..."
> directives with alternate implementations for missing bionic functions.
>
> To debug build errors it helps to add "LOG=debug" to your make command line.
> The error may be in the creation of a local build-jdk image prior to the building of the target platform jre libraries.
>
> On 8/24/18 4:13 AM, guoge (A) wrote:
>> Hi mobile-dev,
>>
>>                   I want to build an android openjdk from the mobile project.(http://hg.openjdk.java.net/mobile/jdk9/)
>>                   I followed the guide(http://openjdk.java.net/projects/mobile/android.html) but failed in the "make images" phase.
>>                   I tried two versions of NDK toolchains(android-ndk32-r10b-linux-x86_64 and  android-ndk-r10e-linux-x86_64) and the followings are the configure and make images command outputs, could you help figure out why the project can't be built successfully?
>>
>>                   In addition, could you tell me how the mobile project adapts to the bionic C when bionic C lacks some functions the openjdk needs(such as ucontext.h, getpwuid_r etc.)?
>>
>>                   Thanks.
>>
>>
>> android-ndk-r10b
>> ----------------------------------------------------------------------
>> ----
>> configure:
>> Configuration summary:
>> * Debug level:    release
>> * HS debug level: product
>> * JDK variant:    normal
>> * JVM variants:   zero
>> * OpenJDK target: OS: android, CPU architecture: arm, address length:
>> 32
>> * Version string: 9-internal+0-adhoc.zhangfan.mobile-jdk9 (9-internal)
>>
>> Tools summary:
>> * Boot JDK:       java version "1.8.0_192-ea" Java(TM) SE Runtime Environment (build 1.8.0_192-ea-b04) Java HotSpot(TM) 64-Bit Server VM (build 25.192-b04, mixed mode)  (at /home/zhangfan/tools/openjdk-builds/jdk1.8.0_192)
>> * Toolchain:      gcc (GNU Compiler Collection)
>> * C Compiler:     Version 4.6 (at /home/zhangfan/code/dev/jdk9mobile/android-ndk-r10b/generated-toolchains/android-arm-toolchain/bin/arm-linux-androideabi-gcc)
>> * C++ Compiler:   Version 4.6 (at /home/zhangfan/code/dev/jdk9mobile/android-ndk-r10b/generated-toolchains/android-arm-toolchain/bin/arm-linux-androideabi-g++)
>>
>> make images:
>> /home/zhangfan/code/dev/jdk9mobile/mobile-jdk9/hotspot/src/share/vm/ut
>> ilities/globalDefinitions_gcc.hpp:79:22: fatal error: ucontext.h: No such file or directory compilation terminated.
>>
>>
>> android-ndk-r10e
>> ----------------------------------------------------------------------
>> ----
>> configure:
>> Configuration summary:
>> * Debug level:    release
>> * HS debug level: product
>> * JDK variant:    normal
>> * JVM variants:   zero
>> * OpenJDK target: OS: android, CPU architecture: arm, address length:
>> 32
>> * Version string: 9-internal+0-adhoc.zhangfan.mobile-jdk9 (9-internal)
>>
>> Tools summary:
>> * Boot JDK:       java version "1.8.0_192-ea" Java(TM) SE Runtime Environment (build 1.8.0_192-ea-b04) Java HotSpot(TM) 64-Bit Server VM (build 25.192-b04, mixed mode)  (at /home/zhangfan/tools/openjdk-builds/jdk1.8.0_192)
>> * Toolchain:      gcc (GNU Compiler Collection)
>> * C Compiler:     Version 4.8 (at /home/zhangfan/code/dev/jdk9mobile/android-ndk-r10e/generated-toolchains/android-arm-toolchain/bin/arm-linux-androideabi-gcc)
>> * C++ Compiler:   Version 4.8 (at /home/zhangfan/code/dev/jdk9mobile/android-ndk-r10e/generated-toolchains/android-arm-toolchain/bin/arm-linux-androideabi-g++)
>>
>> make images:
>> /home/zhangfan/code/dev/jdk9mobile/mobile-jdk9/hotspot/src/os/linux/vm/perfMemory_linux.cpp: In function 'char* get_user_name(uid_t)':
>> /home/zhangfan/code/dev/jdk9mobile/mobile-jdk9/hotspot/src/os/linux/vm/perfMemory_linux.cpp:458:66: error: 'getpwuid_r' was not declared in this scope
>>      int result = getpwuid_r(uid, &pwent, pwbuf, (size_t)bufsize, &p);
>> 	
>> Best Regards,
>> Guoge
>