Enable Exception C++

I am trying to make APP native code for Android. The Native code is in cplusplus. Whenever I try to make, the following error开发者_如何转开发 appears.

H236Plus.cpp:135: error: exception handling disabled, use -fexceptions to enable

How do I use -fexceptions to enable exception handling, and where do i use it?

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It depends on what runtime you are using. If you are not using system runtime and are building with ndk-build, you add any of these to your Android.mk file:

• LOCAL_CPP_FEATURES += exceptions (Recommended)
• LOCAL_CPPFLAGS += -fexceptions

Also, you can add the following line to your Application.mk file:

• APP_CPPFLAGS += -fexceptions

There's more information in docs/CPLUSPLUS-SUPPORT.html in your NDK folder

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You need to build with CrystaX's custom NDK. It has full libstdc++, RTTI and exceptions support. It's generally the best tool for Android development I know.

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-fexception is a compiler switch. How you use it depends on your compiler setup. What compiler are you using? IDE? build tool?

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In the compiler flags add -fexception in your Makefile.

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Refer this answer by @Tundebabzy if you are using ndk-build build system.

For CMake build system

add the following to your module-level build.gradle file:

android {
  ...
  defaultConfig {
    ...
    externalNativeBuild {

      // For ndk-build, instead use ndkBuild {}
      cmake {
        // Enables exception-handling support.
        cppFlags "-fexceptions"
      }
    }
  }
}
...

For more information See this Link.

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with the latest version of Android Studio this is what my build.gradle looks like:

model {
    android {
        compileSdkVersion 23
        buildToolsVersion "23.0.2"

        buildTypes {
            release {
                minifyEnabled false
                shrinkResources false
                proguardFiles.add(file("proguard-rules.txt"))
                signingConfig = $("android.signingConfigs.release")
            }
        }

        defaultConfig {
            applicationId "my.android.app"
            minSdkVersion.apiLevel 16
            targetSdkVersion.apiLevel 23
            versionCode 29
            versionName "my.latest.version"
        }

        ndk {
            moduleName "jni-utils"
            ldLibs.add("log")
            cppFlags.add("-std=c++11")
            cppFlags.add("-fexceptions")
            stl "gnustl_static"
        }
    }
    android.signingConfigs {
        create("release") {
            storeFile "C:\\Android\\Git\\MyProject\\keystore\\keystoreCommon"
            storePassword "put you password here"
            keyAlias "put your alias here"
            keyPassword "put your password here"
        }
    }
}

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I solved this problem by adding cFlags "-fexceptions" into ndk section of build.gradle script, like this:

ndk {
    ...
    cFlags "-fexceptions"
}

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Just a note for anyone who has started with one of the NDK examples.

They tend to set -fno-exceptions in their CMakeLists.txt, you need to remove it:

set(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -Wall -Werror -fno-exceptions -frtti") 

You might want to check whether you want -Werror while you're at it.