找不到 -lgnustl_static：使用 NDK r7 编译 Android SDL 端口
我正在尝试使用新的 Android NDK r7 版本为 Android 构建这个 libSDL 端口：
https://github。 com/pelya/commandergenius
我知道我正在做一些在某种程度上“不受支持”的事情：我正在使用 cygwin&windows，尽管自述文件中提到不再受支持。话虽这么说，我可以破解 shell 脚本并根据需要解决我的问题，并让它编译但不链接。
所以无论如何，我已经编译工作直到链接（抱歉，大块，相关部分在下面修剪）：
/cygdrive/c/and/android-ndk-r7/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/arm-linux-androideabi-ar crs obj/local/armeabi/libflac.a ./obj/local/armeabi/objs-debug/flac/src/ogg_decoder_aspect.o ./obj/local/armeabi/objs-debug/flac/src/md5.o ./obj/local/armeabi/objs-debug/flac/src/stream_decoder.o ./obj/local/armeabi/objs-debug/flac/src/fixed.o ./obj/local/armeabi/objs-debug/flac/src/memory.o ./obj/local/armeabi/objs-debug/flac/src/stream_encoder.o ./obj/local/armeabi/objs-debug/flac/src/window.o ./obj/local/armeabi/objs-debug/flac/src/cpu.o ./obj/local/armeabi/objs-debug/flac/src/ogg_encoder_aspect.o ./obj/local/armeabi/objs-debug/flac/src/lpc.o ./obj/local/armeabi/objs-debug/flac/src/float.o ./obj/local/armeabi/objs-debug/flac/src/bitmath.o ./obj/local/armeabi/objs-debug/flac/src/metadata_object.o ./obj/local/armeabi/objs-debug/flac/src/ogg_helper.o ./obj/local/armeabi/objs-debug/flac/src/metadata_iterators.o ./obj/local/armeabi/objs-debug/flac/src/bitreader.o ./obj/local/armeabi/objs-debug/flac/src/bitwriter.o ./obj/local/armeabi/objs-debug/flac/src/stream_encoder_framing.o ./obj/local/armeabi/objs-debug/flac/src/crc.o ./obj/local/armeabi/objs-debug/flac/src/format.o ./obj/local/armeabi/objs-debug/flac/src/ogg_mapping.o
C:/and/android-ndk-r7/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/../../../../arm-linux-androideabi/bin/ld.exe: cannot find -lgnustl_static
collect2: ld returned 1 exit status
/cygdrive/c/and/android-ndk-r7/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/arm-linux-androideabi-ar crs obj/local/armeabi-v7a/libflac.a ./obj/local/armeabi-v7a/objs-debug/flac/src/ogg_decoder_aspect.o ./obj/local/armeabi-v7a/objs-debug/flac/src/md5.o ./obj/local/armeabi-v7a/objs-debug/flac/src/stream_decoder.o ./obj/local/armeabi-v7a/objs-debug/flac/src/fixed.o ./obj/local/armeabi-v7a/objs-debug/flac/src/memory.o ./obj/local/armeabi-v7a/objs-debug/flac/src/stream_encoder.o ./obj/local/armeabi-v7a/objs-debug/flac/src/window.o ./obj/local/armeabi-v7a/objs-debug/flac/src/cpu.o ./obj/local/armeabi-v7a/objs-debug/flac/src/ogg_encoder_aspect.o ./obj/local/armeabi-v7a/objs-debug/flac/src/lpc.o ./obj/local/armeabi-v7a/objs-debug/flac/src/float.o ./obj/local/armeabi-v7a/objs-debug/flac/src/bitmath.o ./obj/local/armeabi-v7a/objs-debug/flac/src/metadata_object.o ./obj/local/armeabi-v7a/objs-debug/flac/src/ogg_helper.o ./obj/local/armeabi-v7a/objs-debug/flac/src/metadata_iterators.o ./obj/local/armeabi-v7a/objs-debug/flac/src/bitreader.o ./obj/local/armeabi-v7a/objs-debug/flac/src/bitwriter.o ./obj/local/armeabi-v7a/objs-debug/flac/src/stream_encoder_framing.o ./obj/local/armeabi-v7a/objs-debug/flac/src/crc.o ./obj/local/armeabi-v7a/objs-debug/flac/src/format.o ./obj/local/armeabi-v7a/objs-debug/flac/src/ogg_mapping.o
C:/and/android-ndk-r7/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/../../../../arm-linux-androideabi/bin/ld.exe: cannot find -lgnustl_static
collect2: ld returned 1 exit status
相关失败，如果您无法解析那堵文本墙：
ld.exe: cannot find -lgnustl_static
现在，如果我查看 Windows NDK 版本，我会找到 gnustl_* 文件这里：
在 ./android-ndk-r7/sources 下：
./cxx-stl/gnu-libstdc++/libs/armeabi/libgnustl_shared.so
./cxx-stl/gnu-libstdc++/libs/armeabi/libgnustl_static.a
./cxx-stl/gnu-libstdc++/libs/armeabi-v7a/libgnustl_shared.so
./cxx-stl/gnu-libstdc++/libs/armeabi-v7a/libgnustl_static.a
./cxx-stl/gnu-libstdc++/libs/x86/libgnustl_shared.so
./cxx-stl/gnu-libstdc++/libs/x86/libgnustl_static.a
我还查看了 linux android NDK 发行版，它们的打包方式相同（只有 libgnustl 文件，在源代码下构建）目录）。
所以我有 3 个问题：
- 为什么我们要使用 -l 来链接 libgnustl_static 当它是 .a 时 文件？难道不应该只是在对象中包含 .a 文件吗 列表，或者是 -lgnustl_shared？
- 为什么这些文件只在“源”下？我本来希望它们位于“toolchains”库 NDK 目录中。怎么会有人链接到 libgnustl 呢？
- 我可以将这些文件复制到链接器可以看到的地方吗？仅使用 -L 添加他们的目录似乎不起作用，而且我需要获得与正确的构建目标链接的正确版本（armeabi vs armeabi-v7 vs x86）
I'm trying to build this port of libSDL for Android, using the new Android NDK r7 release:
https://github.com/pelya/commandergenius
I know I am doing some things to some degree "unsupported": I am using cygwin&windows despite that being mentioned in the README as no longer being supported. That being said, I can hack out shell scripts and solve my problems as necessary and have it compiling but not linking.
So anyways I have compiling working until the linking (sorry for large block, relevant part trimmed below):
/cygdrive/c/and/android-ndk-r7/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/arm-linux-androideabi-ar crs obj/local/armeabi/libflac.a ./obj/local/armeabi/objs-debug/flac/src/ogg_decoder_aspect.o ./obj/local/armeabi/objs-debug/flac/src/md5.o ./obj/local/armeabi/objs-debug/flac/src/stream_decoder.o ./obj/local/armeabi/objs-debug/flac/src/fixed.o ./obj/local/armeabi/objs-debug/flac/src/memory.o ./obj/local/armeabi/objs-debug/flac/src/stream_encoder.o ./obj/local/armeabi/objs-debug/flac/src/window.o ./obj/local/armeabi/objs-debug/flac/src/cpu.o ./obj/local/armeabi/objs-debug/flac/src/ogg_encoder_aspect.o ./obj/local/armeabi/objs-debug/flac/src/lpc.o ./obj/local/armeabi/objs-debug/flac/src/float.o ./obj/local/armeabi/objs-debug/flac/src/bitmath.o ./obj/local/armeabi/objs-debug/flac/src/metadata_object.o ./obj/local/armeabi/objs-debug/flac/src/ogg_helper.o ./obj/local/armeabi/objs-debug/flac/src/metadata_iterators.o ./obj/local/armeabi/objs-debug/flac/src/bitreader.o ./obj/local/armeabi/objs-debug/flac/src/bitwriter.o ./obj/local/armeabi/objs-debug/flac/src/stream_encoder_framing.o ./obj/local/armeabi/objs-debug/flac/src/crc.o ./obj/local/armeabi/objs-debug/flac/src/format.o ./obj/local/armeabi/objs-debug/flac/src/ogg_mapping.o
C:/and/android-ndk-r7/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/../../../../arm-linux-androideabi/bin/ld.exe: cannot find -lgnustl_static
collect2: ld returned 1 exit status
/cygdrive/c/and/android-ndk-r7/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/arm-linux-androideabi-ar crs obj/local/armeabi-v7a/libflac.a ./obj/local/armeabi-v7a/objs-debug/flac/src/ogg_decoder_aspect.o ./obj/local/armeabi-v7a/objs-debug/flac/src/md5.o ./obj/local/armeabi-v7a/objs-debug/flac/src/stream_decoder.o ./obj/local/armeabi-v7a/objs-debug/flac/src/fixed.o ./obj/local/armeabi-v7a/objs-debug/flac/src/memory.o ./obj/local/armeabi-v7a/objs-debug/flac/src/stream_encoder.o ./obj/local/armeabi-v7a/objs-debug/flac/src/window.o ./obj/local/armeabi-v7a/objs-debug/flac/src/cpu.o ./obj/local/armeabi-v7a/objs-debug/flac/src/ogg_encoder_aspect.o ./obj/local/armeabi-v7a/objs-debug/flac/src/lpc.o ./obj/local/armeabi-v7a/objs-debug/flac/src/float.o ./obj/local/armeabi-v7a/objs-debug/flac/src/bitmath.o ./obj/local/armeabi-v7a/objs-debug/flac/src/metadata_object.o ./obj/local/armeabi-v7a/objs-debug/flac/src/ogg_helper.o ./obj/local/armeabi-v7a/objs-debug/flac/src/metadata_iterators.o ./obj/local/armeabi-v7a/objs-debug/flac/src/bitreader.o ./obj/local/armeabi-v7a/objs-debug/flac/src/bitwriter.o ./obj/local/armeabi-v7a/objs-debug/flac/src/stream_encoder_framing.o ./obj/local/armeabi-v7a/objs-debug/flac/src/crc.o ./obj/local/armeabi-v7a/objs-debug/flac/src/format.o ./obj/local/armeabi-v7a/objs-debug/flac/src/ogg_mapping.o
C:/and/android-ndk-r7/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/../../../../arm-linux-androideabi/bin/ld.exe: cannot find -lgnustl_static
collect2: ld returned 1 exit status
Relevant failure, if you can't parse that wall of text:
ld.exe: cannot find -lgnustl_static
Now, if I look at the Windows NDK release I find gnustl_* files here:
under ./android-ndk-r7/sources:
./cxx-stl/gnu-libstdc++/libs/armeabi/libgnustl_shared.so
./cxx-stl/gnu-libstdc++/libs/armeabi/libgnustl_static.a
./cxx-stl/gnu-libstdc++/libs/armeabi-v7a/libgnustl_shared.so
./cxx-stl/gnu-libstdc++/libs/armeabi-v7a/libgnustl_static.a
./cxx-stl/gnu-libstdc++/libs/x86/libgnustl_shared.so
./cxx-stl/gnu-libstdc++/libs/x86/libgnustl_static.a
I looked also at the linux android NDK distribution and they are packaged the same (only have libgnustl files, built, under the sources directory).
So I have 3 questions:
- why would we be using -l to link libgnustl_static when it's a .a
file? Shouldn't that be just including the .a file in the object
list, or alternately be -lgnustl_shared? - why are these files only under "sources"? I would have expected them to be in the "toolchains" library NDK directory. How does anyone ever link against libgnustl?
- Can I copy these files somewhere where they'll be seen by the linker? Just adding their directory with -L hasn't seemed to work, and plus I need to get the right versions linked with the right build target (armeabi vs armeabi-v7 vs x86)
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评论（2）
这是 gcc/NDK 中的一个错误，在 Linux、Cygwin 和 Windows（非 Cygwin）上表现得略有不同。
这是我修复它的方法（适用于 Linux 和我的一位盲人开发人员，必须使用 Cygwin）...
APP_STL := gnustl_static中删除行>Application.mk（它在 NDK 中损坏，在 Linux Cygwin、Windows 上损坏略有不同）向
$(LOCAL_LDLIBS) 添加一行在您的Android.mk文件中显示：$(NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabi-v7a/libgnustl_static.a
还在
Android.mk中添加两行，内容如下： ，
Application.mk中的APP_STL := gnustl_static应该是这样。This is a bug in gcc/NDK that manifests itself slightly different on Linux, Cygwin, and Windows (non Cygwin).
Here's what I did to fix it (works for Linux and for one of my developers who is blind and has to use Cygwin)...
APP_STL := gnustl_staticfrom yourApplication.mk(it's broken in the NDK, and it's broken slightly differently on Linux Cygwin, Windows)add a line to
$(LOCAL_LDLIBS)in yourAndroid.mkfile that says:$(NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabi-v7a/libgnustl_static.a
also add two lines to
Android.mkthat say:The foregoing will accomplish what having,
APP_STL := gnustl_staticin yourApplication.mkwas supposed to.如果这困扰其他人，解决方案是删除 -lgnustl_static 并改为列出
链接器命令中的 c:\path\to\armeabi\libs\libgnustl_static.a 。
不要使用 /cygdrive 样式路径，因为链接器将无法找到该文件。使用实际的 c:\...
In case this plagues anyone else, the solution is to remove -lgnustl_static and instead list
c:\path\to\armeabi\libs\libgnustl_static.a in the linker command.
Do not use /cygdrive style path, as the linker will fail to find the file. Use actual c:\...