如何在Windows上编译Protobuf 2.6.0 for Android

Question

我正在尝试为Windows上的Android编译Protobuf 2.6.0。

我不得不说，我需要一个静态的Protobuf库，以便在Android上与Qt5一起使用。

在Cygwin bash中，我运行以下命令：

./configure --prefix=c:/Thirdparty/Android/protobuf/build \
--host=arm-linux-androideabi \
--disable-shared \
--enable-cross-compile \
--with-protoc=c:/Thirdparty/bin/protoc \
CC=c:/Thirdparty/Android/NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-gcc.exe \
CXX=c:/Thirdparty/Android/NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-g++.exe \
LDFLAGS=-Lc:/Thirdparty/Android/NDK/platforms/android-5/arch-arm/usr/lib \
CPPFLAGS=-Ic:/Thirdparty/Android/NDK/platforms/android-5/arch-arm/usr/include

但是我得到了下一个错误：

configure:3474: checking whether the C compiler works
configure:3496: c:/Thirdparty/Android/NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-gcc.exe  \
-Ic:/Thirdparty/Android/NDK/platforms/android-5/arch-arm/usr/include \
-Lc:/Thirdparty/Android/NDK/platforms/android-5/arch-arm/usr/lib conftest.c  >&5
c:/thirdparty/android/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld.exe:
error: cannot open crtbegin_dynamic.o: No such file or directory
c:/thirdparty/android/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld.exe:
error: cannot open crtend_android.o: No such file or directory
collect2.exe: error: ld returned 1 exit status

我还能做什么呢？谢谢。

Answer 1

我找到了解决方案。我必须定义--sysroot=""，如下所示：

LDFLAGS="-Lc:/Thirdparty/Android/NDK/platforms/android-5/arch-arm/usr/lib \
--sysroot=c:/Thirdparty/Android/NDK/platforms/android-5/arch-arm"