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在为Android交叉编译时，出现链接到libgcc.a错误，但符号确实存在？

androidgcclinkerandroid-ndkcross-compiling
4
我正在尝试为安卓进行交叉编译一个非常简单的程序，该程序在android-ndk-r6b及以前版本中可以正常工作，但在android-ndk-r7及更新版本中无法工作。
int main() {
  ;
  return 0;
}

我能够使用旧版本的Android上的“agcc”脚本来完成这个任务，该脚本可以在这里找到。我真诚地不想使用Android.mk文件来构建此项目。我知道我可以这样做，但这是我正在处理的更大项目的一部分。所以请相信我，我正在尝试以不同的方式进行交叉编译。
无论如何，我尝试构建并得到以下结果：
$ arm-eabi-gcc -o test test.c
/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/../../../../arm-eabi/bin/ld: warning: /tmp/cc00QD3x.o uses variable-size enums yet the output is to use 32-bit enums; use of enum values across objects may fail
/tmp/cc00QD3x.o:(.ARM.exidx.text.main+0x0): undefined reference to `__aeabi_unwind_cpp_pr0'
collect2: ld returned 1 exit status

所以，关键错误是对__aeabi_unwind_cpp_pr0的未定义引用。
经过一些调查，我连接到的libgcc.a中包含这个符号。
$ arm-eabi-nm /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/lib/gcc/arm-eabi/4.4.3/libgcc.a | grep __aeabi_unwind_cpp_pr0
         U __aeabi_unwind_cpp_pr0
         U __aeabi_unwind_cpp_pr0
         U __aeabi_unwind_cpp_pr0
         U __aeabi_unwind_cpp_pr0
         U __aeabi_unwind_cpp_pr0
         U __aeabi_unwind_cpp_pr0
         U __aeabi_unwind_cpp_pr0
00000590 T __aeabi_unwind_cpp_pr0
         U __aeabi_unwind_cpp_pr0
         U __aeabi_unwind_cpp_pr0

这句话的意思是：“它有一个'T'，这告诉我它在代码中的某个地方，对吗？”
下面这段话是arm-eabi-gcc的详细输出，显示我正在链接到这个库。
Using built-in specs.
Target: arm-eabi
Configured with: /home/jingyu/projects/gcc/android-toolchainsrc/build/../gcc/gcc-4.4.3/configure --prefix=/usr/local --target=arm-eabi --host=x86_64-linux-gnu --build=x86_64-linux-gnu --with-gnu-as --with-gnu-ld --enable-languages=c,c++ --with-gmp=/home/jingyu/projects/gcc/toolchain_build/obj/temp-install --with-mpfr=/home/jingyu/projects/gcc/toolchain_build/obj/temp-install --disable-libssp --enable-threads --disable-nls --disable-libmudflap --disable-libgomp --disable-libstdc__-v3 --disable-sjlj-exceptions --disable-shared --disable-tls --with-float=soft --with-fpu=vfp --with-arch=armv5te --enable-target-optspace --with-abi=aapcs --with-gcc-version=4.4.3 --with-binutils-version=2.19 --with-gmp-version=4.2.4 --with-mpfr-version=2.4.1 --with-gdb-version=7.1.x --with-arch=armv5te --with-multilib-list=mandroid --with-sysroot=/usr/local/google/home/android/cupcake_rel_root --program-transform-name='s&^&arm-eabi-&'
Thread model: single
gcc version 4.4.3 (GCC) 
COLLECT_GCC_OPTIONS='-o' 'test' '-I/home/gnychis/Documents/android/os/system/core/include' '-I/home/gnychis/Documents/android/os/hardware/libhardware/include' '-I/home/gnychis/Documents/android/os/hardware/ril/include' '-I/home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/include' '-I/home/gnychis/Documents/android/os/dalvik/libnativehelper/include' '-I/home/gnychis/Documents/android/os/frameworks/base/include' '-I/home/gnychis/Documents/android/os/external/skia/include' '-I/home/gnychis/Documents/android/os/out/target/product/generic/obj/include' '-I/home/gnychis/Documents/android/os/bionic/libc/arch-arm/include' '-I/home/gnychis/Documents/android/os/bionic/libc/include' '-I/home/gnychis/Documents/android/os/bionic/libstdc++/include' '-I/home/gnychis/Documents/android/os/bionic/libc/kernel/common' '-I/home/gnychis/Documents/android/os/bionic/libc/kernel/arch-arm' '-I/home/gnychis/Documents/android/os/bionic/libm/include' '-I/home/gnychis/Documents/android/os/bionic/libm/include/arch/arm' '-I/home/gnychis/Documents/android/os/bionic/libthread_db/include' '-I/home/gnychis/Documents/android/os/bionic/libm/arm' '-I/home/gnychis/Documents/android/os/bionic/libm' '-I/home/gnychis/Documents/android/os/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_RELEASE' '-DNDEBUG' '-UDEBUG' '-march=armv5te' '-mtune=xscale' '-msoft-float' '-mthumb-interwork' '-fpic' '-fno-exceptions' '-ffunction-sections' '-funwind-tables' '-fstack-protector' '-fmessage-length=0' '-Bdynamic' '-L/home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/lib' '-nostdlib' '-v' '-mfpu=vfp' '-mabi=aapcs'
 /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../libexec/gcc/arm-eabi/4.4.3/cc1 -quiet -v -I/home/gnychis/Documents/android/os/system/core/include -I/home/gnychis/Documents/android/os/hardware/libhardware/include -I/home/gnychis/Documents/android/os/hardware/ril/include -I/home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/include -I/home/gnychis/Documents/android/os/dalvik/libnativehelper/include -I/home/gnychis/Documents/android/os/frameworks/base/include -I/home/gnychis/Documents/android/os/external/skia/include -I/home/gnychis/Documents/android/os/out/target/product/generic/obj/include -I/home/gnychis/Documents/android/os/bionic/libc/arch-arm/include -I/home/gnychis/Documents/android/os/bionic/libc/include -I/home/gnychis/Documents/android/os/bionic/libstdc++/include -I/home/gnychis/Documents/android/os/bionic/libc/kernel/common -I/home/gnychis/Documents/android/os/bionic/libc/kernel/arch-arm -I/home/gnychis/Documents/android/os/bionic/libm/include -I/home/gnychis/Documents/android/os/bionic/libm/include/arch/arm -I/home/gnychis/Documents/android/os/bionic/libthread_db/include -I/home/gnychis/Documents/android/os/bionic/libm/arm -I/home/gnychis/Documents/android/os/bionic/libm -I/home/gnychis/Documents/android/os/out/target/product/generic/obj/SHARED_LIBRARIES/libm_intermediates -iprefix /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/ -D__USES_INITFINI__ -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -DANDROID -DSK_RELEASE -DNDEBUG -UDEBUG test.c -quiet -dumpbase test.c -march=armv5te -mtune=xscale -msoft-float -mthumb-interwork -mfpu=vfp -mabi=aapcs -auxbase test -version -fpic -fno-exceptions -ffunction-sections -funwind-tables -fstack-protector -fmessage-length=0 -o /tmp/ccIIp1N2.s
GNU C (GCC) version 4.4.3 (arm-eabi)
    compiled by GNU C version 4.2.4 (Ubuntu 4.2.4-1ubuntu4), GMP version 4.2.4, MPFR version 2.4.1.
GGC heuristics: --param ggc-min-expand=98 --param ggc-min-heapsize=128206
ignoring nonexistent directory "/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/../../../../arm-eabi/include"
ignoring nonexistent directory "/usr/local/google/home/android/cupcake_rel_root/usr/local/include"
ignoring duplicate directory "/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/../../lib/gcc/arm-eabi/4.4.3/include"
ignoring duplicate directory "/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/../../lib/gcc/arm-eabi/4.4.3/include-fixed"
ignoring nonexistent directory "/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/../../lib/gcc/arm-eabi/4.4.3/../../../../arm-eabi/include"
ignoring nonexistent directory "/usr/local/google/home/android/cupcake_rel_root/usr/include"
ignoring nonexistent directory "/home/gnychis/Documents/android/os/out/target/product/generic/obj/include"
ignoring nonexistent directory "/home/gnychis/Documents/android/os/bionic/libm/include/arch/arm"
ignoring nonexistent directory "/home/gnychis/Documents/android/os/out/target/product/generic/obj/SHARED_LIBRARIES/libm_intermediates"
#include "..." search starts here:
#include <...> search starts here:
 /home/gnychis/Documents/android/os/system/core/include
 /home/gnychis/Documents/android/os/hardware/libhardware/include
 /home/gnychis/Documents/android/os/hardware/ril/include
 /home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/include
 /home/gnychis/Documents/android/os/dalvik/libnativehelper/include
 /home/gnychis/Documents/android/os/frameworks/base/include
 /home/gnychis/Documents/android/os/external/skia/include
 /home/gnychis/Documents/android/os/bionic/libc/arch-arm/include
 /home/gnychis/Documents/android/os/bionic/libc/include
 /home/gnychis/Documents/android/os/bionic/libstdc++/include
 /home/gnychis/Documents/android/os/bionic/libc/kernel/common
 /home/gnychis/Documents/android/os/bionic/libc/kernel/arch-arm
 /home/gnychis/Documents/android/os/bionic/libm/include
 /home/gnychis/Documents/android/os/bionic/libthread_db/include
 /home/gnychis/Documents/android/os/bionic/libm/arm
 /home/gnychis/Documents/android/os/bionic/libm
 /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/include
 /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/include-fixed
End of search list.
GNU C (GCC) version 4.4.3 (arm-eabi)
    compiled by GNU C version 4.2.4 (Ubuntu 4.2.4-1ubuntu4), GMP version 4.2.4, MPFR version 2.4.1.
GGC heuristics: --param ggc-min-expand=98 --param ggc-min-heapsize=128206
Compiler executable checksum: c575b4a30c8a516a84cf6e49f2cb23d1
COLLECT_GCC_OPTIONS='-o' 'test' '-I/home/gnychis/Documents/android/os/system/core/include' '-I/home/gnychis/Documents/android/os/hardware/libhardware/include' '-I/home/gnychis/Documents/android/os/hardware/ril/include' '-I/home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/include' '-I/home/gnychis/Documents/android/os/dalvik/libnativehelper/include' '-I/home/gnychis/Documents/android/os/frameworks/base/include' '-I/home/gnychis/Documents/android/os/external/skia/include' '-I/home/gnychis/Documents/android/os/out/target/product/generic/obj/include' '-I/home/gnychis/Documents/android/os/bionic/libc/arch-arm/include' '-I/home/gnychis/Documents/android/os/bionic/libc/include' '-I/home/gnychis/Documents/android/os/bionic/libstdc++/include' '-I/home/gnychis/Documents/android/os/bionic/libc/kernel/common' '-I/home/gnychis/Documents/android/os/bionic/libc/kernel/arch-arm' '-I/home/gnychis/Documents/android/os/bionic/libm/include' '-I/home/gnychis/Documents/android/os/bionic/libm/include/arch/arm' '-I/home/gnychis/Documents/android/os/bionic/libthread_db/include' '-I/home/gnychis/Documents/android/os/bionic/libm/arm' '-I/home/gnychis/Documents/android/os/bionic/libm' '-I/home/gnychis/Documents/android/os/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_RELEASE' '-DNDEBUG' '-UDEBUG' '-march=armv5te' '-mtune=xscale' '-msoft-float' '-mthumb-interwork' '-fpic' '-fno-exceptions' '-ffunction-sections' '-funwind-tables' '-fstack-protector' '-fmessage-length=0' '-Bdynamic' '-L/home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/lib' '-nostdlib' '-v' '-mfpu=vfp' '-mabi=aapcs'
 /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/../../../../arm-eabi/bin/as -v -I/home/gnychis/Documents/android/os/system/core/include -I/home/gnychis/Documents/android/os/hardware/libhardware/include -I/home/gnychis/Documents/android/os/hardware/ril/include -I/home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/include -I/home/gnychis/Documents/android/os/dalvik/libnativehelper/include -I/home/gnychis/Documents/android/os/frameworks/base/include -I/home/gnychis/Documents/android/os/external/skia/include -I/home/gnychis/Documents/android/os/out/target/product/generic/obj/include -I/home/gnychis/Documents/android/os/bionic/libc/arch-arm/include -I/home/gnychis/Documents/android/os/bionic/libc/include -I/home/gnychis/Documents/android/os/bionic/libstdc++/include -I/home/gnychis/Documents/android/os/bionic/libc/kernel/common -I/home/gnychis/Documents/android/os/bionic/libc/kernel/arch-arm -I/home/gnychis/Documents/android/os/bionic/libm/include -I/home/gnychis/Documents/android/os/bionic/libm/include/arch/arm -I/home/gnychis/Documents/android/os/bionic/libthread_db/include -I/home/gnychis/Documents/android/os/bionic/libm/arm -I/home/gnychis/Documents/android/os/bionic/libm -I/home/gnychis/Documents/android/os/out/target/product/generic/obj/SHARED_LIBRARIES/libm_intermediates -march=armv5te -mthumb-interwork -mfloat-abi=soft -mfpu=vfp -meabi=5 -o /tmp/ccGAKjxX.o /tmp/ccIIp1N2.s
GNU assembler version 2.19 (arm-eabi) using BFD version (GNU Binutils) 2.19
COMPILER_PATH=/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../libexec/gcc/arm-eabi/4.4.3/:/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../libexec/gcc/:/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/../../../../arm-eabi/bin/
LIBRARY_PATH=/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/:/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/:/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/../../../../arm-eabi/lib/
COLLECT_GCC_OPTIONS='-o' 'test' '-I/home/gnychis/Documents/android/os/system/core/include' '-I/home/gnychis/Documents/android/os/hardware/libhardware/include' '-I/home/gnychis/Documents/android/os/hardware/ril/include' '-I/home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/include' '-I/home/gnychis/Documents/android/os/dalvik/libnativehelper/include' '-I/home/gnychis/Documents/android/os/frameworks/base/include' '-I/home/gnychis/Documents/android/os/external/skia/include' '-I/home/gnychis/Documents/android/os/out/target/product/generic/obj/include' '-I/home/gnychis/Documents/android/os/bionic/libc/arch-arm/include' '-I/home/gnychis/Documents/android/os/bionic/libc/include' '-I/home/gnychis/Documents/android/os/bionic/libstdc++/include' '-I/home/gnychis/Documents/android/os/bionic/libc/kernel/common' '-I/home/gnychis/Documents/android/os/bionic/libc/kernel/arch-arm' '-I/home/gnychis/Documents/android/os/bionic/libm/include' '-I/home/gnychis/Documents/android/os/bionic/libm/include/arch/arm' '-I/home/gnychis/Documents/android/os/bionic/libthread_db/include' '-I/home/gnychis/Documents/android/os/bionic/libm/arm' '-I/home/gnychis/Documents/android/os/bionic/libm' '-I/home/gnychis/Documents/android/os/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_RELEASE' '-DNDEBUG' '-UDEBUG' '-march=armv5te' '-mtune=xscale' '-msoft-float' '-mthumb-interwork' '-fpic' '-fno-exceptions' '-ffunction-sections' '-funwind-tables' '-fstack-protector' '-fmessage-length=0' '-Bdynamic' '-L/home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/lib' '-nostdlib' '-v' '-mfpu=vfp' '-mabi=aapcs'
 /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../libexec/gcc/arm-eabi/4.4.3/collect2 --sysroot=/usr/local/google/home/android/cupcake_rel_root -X -o test -L/home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/lib -L/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3 -L/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc -L/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/../../../../arm-eabi/lib -T /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/arm-eabi/lib/ldscripts/armelf.x -dynamic-linker /system/bin/linker --gc-sections -z nocopyreloc --no-undefined -rpath-link=/home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/lib /home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/lib/crtend_android.o /home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/lib/crtbegin_dynamic.o /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/lib32/libiberty.a /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/lib/gcc/arm-eabi/4.4.3/libgcc.a -lc -lm /tmp/ccGAKjxX.o
/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/../../../../arm-eabi/bin/ld: warning: /tmp/ccGAKjxX.o uses variable-size enums yet the output is to use 32-bit enums; use of enum values across objects may fail
/tmp/ccGAKjxX.o:(.ARM.exidx.text.main+0x0): undefined reference to `__aeabi_unwind_cpp_pr0'
collect2: ld returned 1 exit status

所以我有点不确定为什么会出现这个未定义的引用。我曾经使用过这种交叉编译的方法，只是Android版本稍有不同，没有遇到任何问题。
有没有人注意到什么问题？
编辑：实际生成的命令如下：
arm-eabi-gcc -o test -I/home/gnychis/Documents/android/os/system/core/include -I/home/gnychis/Documents/android/os/hardware/libhardware/include -I/home/gnychis/Documents/android/os/hardware/ril/include -I/home/gnychis/Documents/android/os/dalvik/libnativehelper/include -I/home/gnychis/Documents/android/os/frameworks/base/include -I/home/gnychis/Documents/android/os/external/skia/include -I/home/gnychis/Documents/android/os/out/target/product/generic/obj/include -I/home/gnychis/Documents/android/os/bionic/libc/arch-arm/include -I/home/gnychis/Documents/android/os/bionic/libc/include -I/home/gnychis/Documents/android/os/bionic/libstdc++/include -I/home/gnychis/Documents/android/os/bionic/libc/kernel/common -I/home/gnychis/Documents/android/os/bionic/libc/kernel/arch-arm -I/home/gnychis/Documents/android/os/bionic/libm/include -I/home/gnychis/Documents/android/os/bionic/libm/include/arch/arm -I/home/gnychis/Documents/android/os/bionic/libthread_db/include -I/home/gnychis/Documents/android/os/bionic/libm/arm -I/home/gnychis/Documents/android/os/bionic/libm -I/home/gnychis/Documents/android/os/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_RELEASE -DNDEBUG -include /home/gnychis/Documents/android/os/system/core/include/arch/linux-arm/AndroidConfig.h -UDEBUG -march=armv5te -mtune=xscale -msoft-float -mthumb-interwork -fpic -fno-exceptions -ffunction-sections -funwind-tables -fstack-protector -fmessage-length=0 -Bdynamic -Wl,-T,/home/gnychis/Documents/android/os/build/core/armelf.x -Wl,-dynamic-linker,/system/bin/linker -Wl,--gc-sections -Wl,-z,nocopyreloc -Wl,--no-undefined -Wl,-rpath-link=/home/gnychis/Documents/android/os/../android-ndk-r7b/platforms/android-9/arch-arm/usr/lib -L/home/gnychis/Documents/android/os/../android-ndk-r7b/platforms/android-9/arch-arm/usr/lib -nostdlib /home/gnychis/Documents/android/os/../android-ndk-r7b/platforms/android-9/arch-arm/usr/lib/crtend_android.o /home/gnychis/Documents/android/os/../android-ndk-r7b/platforms/android-9/arch-arm/usr/lib/crtbegin_dynamic.o /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/lib/gcc/arm-eabi/4.4.3/libgcc.a -lc -lm test.c
事实证明，我在使用NDK-6和NDK-6b时没有遇到这个错误。然而，在使用NDK-7和NDK-7b时，我确实遇到了这个错误。一定是有些东西发生了变化。我现在是否缺少某种编译器/链接标志？ - gnychis
2个回答
8

以下是您的链接，为了更加清晰，已拆分成多行：

/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../libexec/gcc/arm-eabi/4.4.3/collect2 \
  --sysroot=/usr/local/google/home/android/cupcake_rel_root \
  -X \
  -o test \
  -L/home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/lib \
  -L/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3 \
  -L/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc
  -L/home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/../../../../arm-eabi/lib
  -T /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/arm-eabi/lib/ldscripts/armelf.x \
  -dynamic-linker /system/bin/linker \
  --gc-sections \
  -z nocopyreloc \
  --no-undefined \
  -rpath-link=/home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/lib \
  /home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/lib/crtend_android.o \
  /home/gnychis/Documents/android/android-ndk-r7b/platforms/android-9/arch-arm/usr/lib/crtbegin_dynamic.o \
  /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/lib32/libiberty.a \
  /home/gnychis/Documents/android/os/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/lib/gcc/arm-eabi/4.4.3/libgcc.a \
  -lc \
  -lm \
  /tmp/ccGAKjxX.o

正如您所看到的，您自己的对象文件（临时文件）是命令行中最后一个项目。这是不正确的。如果要正确链接，它需要在库之前。
基本上，您的agcc脚本传递了-nostdlib（表示您知道得更好），然后手动传递库，但顺序完全错误。如果您修复此问题，则一切都应该正常。
链接顺序非常重要。提供符号的对象和库必须在需要符号的对象和库之后链接。
某些工具的特定版本可以容忍错误的排序，但我认为那是一个错误或误导性的功能，因为新的工具链不能也不应该容忍。想必这个脚本是为其中一个编写的。
非常感谢您的回复，我对您的解决方案充满希望 :) 我很好奇如何强制链接我的对象文件在库之前。我编辑了我的帖子，包括由agcc生成的命令。我不确定如何修改它以强制将临时对象文件放在库之前。如果我能弄清楚这一点，我就知道如何编辑agcc脚本了。 - gnychis
把.c文件放在任何其他文件之前就可以了！ - ams
1
这么简单... :D 我会尽快授予您我的赏金，但它说我必须等待7个小时。 - gnychis
1

在哪里找到: __aeabi_unwind_cpp_pr0 和其他神秘的未定义函数

（我遇到了类似的问题，但找到了不同的解决方法，这可能对您或其他人有帮助）

我在Google NDK包中找到了'libgccunwind.a'库，该库定义了许多这些神秘的函数（它们是由libc.a和NDK包中的其他库引用的函数，但未在标准库中定义）。 我在以下目录下的libgccunwind.a库中找到了它们的定义：

\sources\android\gccunwind\libs\armeabi

NM显示它们在该库中从'unwind-arm.o'文件中定义：

nm libgccunwind.a

unwind-arm.o:
         U _GLOBAL_OFFSET_TABLE_
00000cf8 T _Unwind_Complete
00000cfc T _Unwind_DeleteException
00000ba4 T _Unwind_GetCFA
00000408 t _Unwind_GetGR
00000474 t _Unwind_SetGR
000003c4 T _Unwind_VRS_Get
0000084c T _Unwind_VRS_Pop
00000430 T _Unwind_VRS_Set
00000844 T __aeabi_unwind_cpp_pr0
0000083c W __aeabi_unwind_cpp_pr1
00000834 W __aeabi_unwind_cpp_pr2
         w __cxa_begin_cleanup
         w __cxa_call_unexpected
         w __cxa_type_match
         U __exidx_end
         U __exidx_start
00000d1c T __gnu_Unwind_Backtrace
         w __gnu_Unwind_Find_exidx

独立于上述libgccunwind.a, 我搜索了__aeabi_unwind_cpp_pr0和unwind-arm.c与unwind.c，并找到了各种c源代码，例如:

http://lxr.free-electrons.com/source/arch/arm/kernel/unwind.c?a=arm

http://opensource.apple.com/source/gcc/gcc-5646/gcc/config/arm/unwind-arm.c

这些程序似乎来自相似的源代码。 我猜测当函数返回或发生某些事件时，libc.a中的函数会调用这些“unwind_cpp”（以及相关函数），以便这些函数可以执行某些调试或跟踪操作。
无论如何，在链接器选项-L和-lgccunwind（在-lc链接器选项之后）中添加该目录，允许链接器找到那些“未定义”的函数 - 并让我继续解决交叉编译到ARM系统的下一个问题。
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