This is a problem with your c++ program, not with android.
m is declared but not defined.
You need to add
int c::m;
to your source file.
simon wrote:
> hi all,
>
> i'm trying to compile simple native application under Android platform
> and got problem with linker (looks like linker or linker scripts bug)
>
> my simple program:
>
> class C
> {
> static int m;
>
> public:
> static void f() { m = 0; }
> };
>
> int main(int, char**)
> {
> C::f();
> return 0;
> }
>
> compilation commands:
>
> arm-eabi-gcc -c -I/home/simon/workspace/mydroid/system/core/include -I/
> home/simon/workspace/mydroid/hardware/libhardware/include -I/home/
> simon/workspace/mydroid/hardware/ril/include -I/home/simon/workspace/
> mydroid/dalvik/libnativehelper/include/nativehelper -I/home/simon/
> workspace/mydroid/frameworks/base/include -I/home/simon/workspace/
> mydroid/frameworks/base/libs/audioflinger -I/home/simon/workspace/
> mydroid/external/skia/include -I/home/simon/workspace/mydroid/out/
> target/product/generic/obj/include -I/home/simon/workspace/mydroid/
> bionic/libc/arch-arm/include -I/home/simon/workspace/mydroid/bionic/
> libc/include -I/home/simon/workspace/mydroid/bionic/libstdc++/include -
> I/home/simon/workspace/mydroid/bionic/libc/kernel/common -I/home/simon/
> workspace/mydroid/bionic/libc/kernel/arch-arm -I/home/simon/workspace/
> mydroid/bionic/libm/include -I/home/simon/workspace/mydroid/bionic/
> libm/include/arch/arm -I/home/simon/workspace/mydroid/bionic/
> libthread_db/include -I/home/simon/workspace/mydroid/bionic/libm/arm -
> I/home/simon/workspace/mydroid/bionic/libm -I/home/simon/workspace/
> mydroid/out/target/product/generic/obj/SHARED_LIBRARIES/
> libm_intermediates -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -
> D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -DANDROID -DSK_DEBUG -DDEBUG -
> march=armv5te -mtune=xscale -msoft-float -mthumb-interwork -fno-
> threadsafe-statics -fpic -fno-exceptions -ffunction-sections -funwind-
> tables -fstack-protector-all -fmessage-length=0 main2.cpp
>
> arm-eabi-gcc -o mt -I/home/simon/workspace/mydroid/system/core/include
> -I/home/simon/workspace/mydroid/hardware/libhardware/include -I/home/
> simon/workspace/mydroid/hardware/ril/include -I/home/simon/workspace/
> mydroid/dalvik/libnativehelper/include/nativehelper -I/home/simon/
> workspace/mydroid/frameworks/base/include -I/home/simon/workspace/
> mydroid/frameworks/base/libs/audioflinger -I/home/simon/workspace/
> mydroid/external/skia/include -I/home/simon/workspace/mydroid/out/
> target/product/generic/obj/include -I/home/simon/workspace/mydroid/
> bionic/libc/arch-arm/include -I/home/simon/workspace/mydroid/bionic/
> libc/include -I/home/simon/workspace/mydroid/bionic/libstdc++/include -
> I/home/simon/workspace/mydroid/bionic/libc/kernel/common -I/home/simon/
> workspace/mydroid/bionic/libc/kernel/arch-arm -I/home/simon/workspace/
> mydroid/bionic/libm/include -I/home/simon/workspace/mydroid/bionic/
> libm/include/arch/arm -I/home/simon/workspace/mydroid/bionic/
> libthread_db/include -I/home/simon/workspace/mydroid/bionic/libm/arm -
> I/home/simon/workspace/mydroid/bionic/libm -I/home/simon/workspace/
> mydroid/out/target/product/generic/obj/SHARED_LIBRARIES/
> libm_intermediates -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -
> D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -DANDROID -DSK_DEBUG -DDEBUG -
> march=armv5te -mtune=xscale -msoft-float -mthumb-interwork -fno-
> threadsafe-statics -fpic -fno-exceptions -ffunction-sections -funwind-
> tables -fstack-protector-all -fmessage-length=0 -Bdynamic -Wl,-T,/home/
> simon/workspace/mydroid/build/core/armelf.x -Wl,-dynamic-linker,/
> system/bin/linker -Wl,--gc-sections -Wl,-z,nocopyreloc -Wl,--no-
> undefined -Wl,-rpath,/system/lib,-rpath,/data/lib -Wl,-rpath-link,/
> home/simon/workspace/mydroid/out/target/product/generic/obj/lib -L/
> home/simon/workspace/mydroid/out/target/product/generic/obj/lib -
> nostdlib /home/simon/workspace/mydroid/out/target/product/generic/obj/
> lib/crtend_android.o /home/simon/workspace/mydroid/out/target/product/
> generic/obj/lib/crtbegin_static.o -lc -lm -gdb main2.o
>
> linker output and error message:
>
> main2.o: In function `C::f()':
> main2.cpp:(.gnu.linkonce.t._ZN1C1fEv+0x64): undefined reference to
> `C::m'
> collect2: ld returned 1 exit status
>
> Maybe I use wrong ldscripts? Have somebody any suggestions?
> Thanks for advice.
>
> >
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