【发布时间】：2017-01-16 00:10:50
【问题描述】：
我正在为 android 5.1.1 构建一个 c 库。
首先，我按照 google ndk standalone toolchain guild 构建一个独立的工具链。
<prebuilt_ndk_r12b_path>/build/tools/make-standalone-toolchain.sh --platform=android-22 --ndk-dir=<prebuilt_ndk_r12b_path> --install-dir=/home/r0ng/utilities/ndk --toolchain=x86_64-linux-android-4.9
之后，我在 ~/.bashrc 中导出了 CC、AR 和 RANLIB
export ANDROID_NDK=/home/r0ng/utilities/ndk
SYSROOT=$ANDROID_NDK/sysroot
export CC="$ANDROID_NDK/bin/arm-linux-androideabi-gcc-4.9.x --sysroot=$SYSROOT"
export AR="$ANDROID_NDK/bin/arm-linux-androideabi-gcc-ar --sysroot=$SYSROOT"
export RANLIB="$ANDROID_NDK/bin/arm-linux-androideabi-gcc-ranlib --sysroot=$SYSROOT"
但是当我尝试使用cmake .. 进行编译时。我有以下错误：
-- The C compiler identification is GNU 4.9.0
-- The CXX compiler identification is GNU 4.9.3
-- Check for working C compiler: /home/r0ng/utilities/ndk/bin/arm-linux-androideabi-gcc
-- Check for working C compiler: /home/r0ng/utilities/ndk/bin/arm-linux-androideabi-gcc -- broken
CMake Error at /usr/share/cmake-3.5/Modules/CMakeTestCCompiler.cmake:61 (message):
The C compiler "/home/r0ng/utilities/ndk/bin/arm-linux-androideabi-gcc" is
not able to compile a simple test program.
It fails with the following output:
Change Dir: /home/r0ng/projects/relic/build/CMakeFiles/CMakeTmp
Run Build Command:"/usr/bin/make" "cmTC_8d7ca/fast"
/usr/bin/make -f CMakeFiles/cmTC_8d7ca.dir/build.make
CMakeFiles/cmTC_8d7ca.dir/build
make[1]: Entering directory
'/home/r0ng/projects/relic/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_8d7ca.dir/testCCompiler.c.o
/home/r0ng/utilities/ndk/bin/arm-linux-androideabi-gcc
--sysroot=/home/r0ng/utilities/ndk -o
CMakeFiles/cmTC_8d7ca.dir/testCCompiler.c.o -c
/home/r0ng/projects/relic/build/CMakeFiles/CMakeTmp/testCCompiler.c
Linking C executable cmTC_8d7ca
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_8d7ca.dir/link.txt
--verbose=1
/home/r0ng/utilities/ndk/bin/arm-linux-androideabi-gcc
--sysroot=/home/r0ng/utilities/ndk
CMakeFiles/cmTC_8d7ca.dir/testCCompiler.c.o -o cmTC_8d7ca -rdynamic
/home/r0ng/utilities/ndk/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld:
error: cannot open crtbegin_dynamic.o: No such file or directory
/home/r0ng/utilities/ndk/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld:
error: cannot open crtend_android.o: No such file or directory
/home/r0ng/utilities/ndk/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld:
error: cannot find -lc
/home/r0ng/utilities/ndk/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld:
error: cannot find -ldl
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_8d7ca.dir/build.make:97: recipe for target 'cmTC_8d7ca'
failed
make[1]: *** [cmTC_8d7ca] Error 1
make[1]: Leaving directory
'/home/r0ng/projects/relic/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_8d7ca/fast' failed
make: *** [cmTC_8d7ca/fast] Error 2
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:6 (project)
-- Configuring incomplete, errors occurred!
See also "/home/r0ng/projects/relic/build/CMakeFiles/CMakeOutput.log".
See also "/home/r0ng/projects/relic/build/CMakeFiles/CMakeError.log".
编译器似乎找不到“crtbegin_dynamic.o”、“crtend_android.o”、“libc”和“libdl”。但是当我检查时，这些文件都在文件夹 $HOME/utilities/ndk/sysroot/usr/lib 中。我已经在 CC、AR 和 RANLIB 中设置了 --sysroot。
更新 1：
根据 Dan Albert 的评论更改工具链生成命令后，命令cmake .. 能够成功运行。但是当我运行make . 时出现以下错误：
arm-linux-androideabi-gcc-4.9.x: error: unrecognized command line option '-m64'
src/CMakeFiles/relic.dir/build.make:62: recipe for target 'src/CMakeFiles/relic.dir/relic_err.c.o' failed
make[2]: *** [src/CMakeFiles/relic.dir/relic_err.c.o] Error 1
CMakeFiles/Makefile2:120: recipe for target 'src/CMakeFiles/relic.dir/all' failed
make[1]: *** [src/CMakeFiles/relic.dir/all] Error 2
Makefile:138: recipe for target 'all' failed
make: *** [all] Error 2
谢谢，
环境：
- 操作系统：Ubuntu 16.04 LTS
- gcc / g++: 4.9.3
- AOSP：5.1.1_r30
- NDK：android-ndk-r12b
- cmake: 3.5.1
【问题讨论】：
-
您将 sysroot 设置为
$HOME/utilities/ndk，因此crtbegin_dynamic.o相对于它位于/sysroot/usr/lib。通常，编译器在“/usr/lib”下搜索，而不是在/sysroot/usr/lib。 -
--toolchain=x86_64-linux-android-4.9是错字吗？如果你想为 ARM 构建它应该是--toolchain=arm-linux-androideabi-4.9。另外，由于您使用的是r12，我应该指出该工具的新版本是make_standalone_toolchain.py，您可以使用--arch arm。 -
正如 Dan Albert 指出的，感谢您的评论 :)。
--toolchain使用了不正确的值。在我将工具链值更改为arm-linux-androideabi-4.9之后。配置过程能够成功完成。但是，当我执行make命令来制作二进制文件时。我收到一个错误arm-linux-androideabi-gcc-4.9.x: error: unrecognized command line option '-m64'。不知道如何解决。
标签： c android-ndk cmake cross-compiling