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Editorial Team
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Asked: 2026-06-13T17:03:57+00:00

I’m trying to build a wraper using some old C++ code in Android. When

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I’m trying to build a wraper using some old C++ code in Android.

When compiling the errors bellow are shown:

In file included from /usr/local/android/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/bits/stl_algobase.h:61:0,
                 from /usr/local/android/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/bits/stl_tree.h:63,
                 from /usr/local/android/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/map:60,
                 from /home/vocalize/source/xxxxxxxxxxxxxxxxxxxxx/Lxxxxxxx.h:9,
                 from /home/vocalize/source/xxxxxxxxxxxxxxxxx/jni/cxxx_wrap.c:3:
/usr/local/android/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/bits/functexcept.h:43:1: error: unknown type name 'namespace'
/usr/local/android/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/bits/functexcept.h:44:1: error: expected ',' or ';' before '{' token

I’m using the following Makefile.mk

include $(CLEAR_VARS)
LOCAL_C_INCLUDES := $(MY_LIB_DIR)include

LOCAL_CFLAGS += -DHAVE_CONFIG_H
LOCAL_CFLAGS += -DANDROID_NDK

LOCAL_PATH := $(BASE_PATH)
LOCAL_MODULE := cxxxx_lib

LOCAL_SRC_FILES := cxxxx_wrap.c

LOCAL_STATIC_LIBRARIES := my_lib
LOCAL_LDLIBS := -llog 

include $(BUILD_SHARED_LIBRARY)

What I can do to fix these errors?

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1 Answer

  1. Editorial Team

    A C++ .h file is being included from cxxx_wrap.c, which is a .c file. The compiler uses the extension of the source file to detect the language. So it’s assuming C, and choking on the C++-specific syntax.

    Rename cxxx_wrap.c to .cpp or .cxx. Or surround the #include "Lxxxxxxx.h" line with #ifdef __cplusplus/#endif. Or force C++ compilation by specifying -x c++ compiler option.

    Once you do, make sure all JNI methods in cxxx_wrap are declared with JNIEXPORT or surrounded with extern "C" {}. Otherwise, the Java run-time won’t find them.

    For the record: renaming the .h file to .hpp won’t help.

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