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POAndroid NDK R5 and support of C++ exception
 

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  1. POAndroid NDK R5 and support of C++ exception
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    <p>I am trying to use the NDK 5 full C++ gnustl:</p> <p>The <code>CPLUSPLUS-SUPPORT.html</code> states:</p> <blockquote> <p>The NDK toolchain supports C++ exceptions, since NDK r5, however all C++ sources are compiled with -fno-exceptions support by default, for compatibility reasons with previous releases.</p> <p>To enable it, use the '-fexceptions' C++ compiler flag. This can be done by adding the following to every module definition in your Android.mk:</p> <pre><code>LOCAL_CPPFLAGS += -fexceptions </code></pre> <p>More simply, add a single line to your Application.mk, the setting will automatically apply to all your project's NDK modules:</p> <pre><code>APP_CPPFLAGS += -fexceptions </code></pre> </blockquote> <p><code>sources/cxx-stl/gnu-libstdc++/README</code> states:</p> <blockquote> <p>This directory contains the headers and prebuilt binaries for the GNU libstdc++-v3 C++ Standard Template Library implementation.</p> <p>These are generated from the toolchain sources by the rebuild-all-prebuilt.sh script under build/tools.</p> <p>To use it, define APP_STL to 'gnustl_static' in your Application.mk. See docs/CPLUSPLUS-SUPPORT.html for more details.</p> <p>This implementation fully supports C++ exceptions and RTTI.</p> </blockquote> <p>But all attempts using exceptions fail. An alternative NDK exists on <a href="http://www.crystax.net/android/ndk-r4.php">http://www.crystax.net/android/ndk-r4.php</a>. Using the the hello-jni example from that NDK does not work. Compliation with NDK 5 works after creating an <code>Application.xml</code> with</p> <pre><code>APP_STL := gnustl_static </code></pre> <p>Setting APP_STL to <code>gnustl_static</code> also automatically enables <code>-frtti</code> and <code>-fexceptions</code>. But it dies the same horrific death as my own experiments. </p> <p>I have managed to get a minimal example of code that is crashing for me:</p> <pre><code>try { __android_log_write(ANDROID_LOG_DEBUG,"foobar","trhown!"); throw "Wrong object type."; } catch (char* b) { __android_log_write(ANDROID_LOG_DEBUG,"foobar","catched!"); } </code></pre> <p>Am I am missing something or is the statement in the <code>README</code> and <code>CPLUSPLUS-SUPPORT.html</code> just plain wrong?</p>
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    1. COYou haven't said what your failure is, so its hard to help; Exceptions, RTTI, and static_gnustl work for me on NDK-r5.
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    2. COI added an example that crashes.
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    3. COInvoke the ndk_build command with the argument V=1 and you will see the commands given to build and link. Are you sure the crash is due to exceptions?
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