Hey all,

I'm having a difficult time compiling qt5 for android with mysql support. I've downloaded the mariadb connector sources, and configured CMake for mariadb to utilize the android toolchain (compiled and installed into API-9 for ARM in this case). However, when I run configure with the following switches:
./configure -prefix /home/rich/local/qt5android -xplatform android-g++ -nomake tests -nomake examples -android-ndk /opt/android-ndk -android-sdk /opt/android-sdk-update-manager -android-ndk-host linux-x86_64 -android-toolchain-version 4.8 -skip qttranslations -skip qtwebkit -skip qtserialport -skip qtwebkit-examples -no-warnings-are-errors -system-proxies -no-cups -plugin-sql-mysql -opensource -confirm-license -developer-build -debug -v
I get errors about missing pthread, rt, and mysqlclient_r libraries:
/opt/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++ --sysroot=/opt/android-ndk/platforms/android-9/arch-arm/ -Wl,--no-undefined -Wl,-z,noexecstack -shared -o mysql_r mysql.o -L/opt/android-ndk/sources/cxx-stl/gnu-libstdc++/4.8/libs/armeabi-v7a -L/opt/android-ndk/platforms/android-9/arch-arm//usr/lib -L/usr/lib64/mysql -lpthread -lz -lm -lrt -lssl -lcrypto -ldl -lmysqlclient_r -lgnustl_shared -llog -lz -lm -ldl -lc -lgcc
/opt/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lpthread
/opt/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lrt
/opt/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: warning: skipping incompatible /usr/lib64/mysql/libmysqlclient_r.so while searching for mysqlclient_r
/opt/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lmysqlclient_r
collect2: error: ld returned 1 exit status
gmake: *** [mysql_r] Error 1
MySQL (thread-safe) disabled.
MySQL (thread-unsafe) auto-detection... ()
/opt/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++ -c -Wno-psabi -march=armv7-a -mfloat-abi=softfp -mfpu=vfp -ffunction-sections -funwind-tables -fstack-protector -fno-short-enums -DANDROID -Wa,--noexecstack -std=gnu++0x -O2 -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -Wall -Wno-psabi -W -fPIE -DQT_NO_PRINTER -DQT_NO_PRINTDIALOG -I../../../mkspecs/android-g++ -I. -I/usr/include/mysql -I/opt/android-ndk/sources/cxx-stl/gnu-libstdc++/4.8/include -I/opt/android-ndk/sources/cxx-stl/gnu-libstdc++/4.8/libs/armeabi-v7a/include -I/opt/android-ndk/platforms/android-9/arch-arm/usr/include -o mysql.o mysql.cpp
/opt/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++ --sysroot=/opt/android-ndk/platforms/android-9/arch-arm/ -Wl,--no-undefined -Wl,-z,noexecstack -shared -o mysql mysql.o -L/opt/android-ndk/sources/cxx-stl/gnu-libstdc++/4.8/libs/armeabi-v7a -L/opt/android-ndk/platforms/android-9/arch-arm//usr/lib -L/usr/lib64/mysql -lpthread -lz -lm -lrt -lssl -lcrypto -ldl -lmysqlclient -lgnustl_shared -llog -lz -lm -ldl -lc -lgcc
/opt/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lpthread
/opt/android-ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lrt
collect2: error: ld returned 1 exit status
gmake: *** [mysql] Error 1
MySQL (thread-unsafe) disabled.
MySQL support cannot be enabled due to functionality tests!
Here's the contents of my lib dir under my API 9 sysroot:
Qt Code: 
  1. ls /opt/android-ndk/platforms/android-9/arch-arm/usr/lib
  2. crtbegin_dynamic.o  libcrypto.a      libGLESv2.so        libmariadb.so.1   libncurses++.a  libreadline.so.6  libtinfo.a
  3. crtbegin_so.o       libc.so          libhistory.a        libmenu.a         libncurses_g.a  libssl.a          libtinfo_g.a
  4. crtbegin_static.o   libdl.so         libhistory.so.6     libmenu_g.a       libncurses_p.a  libstdc++.a       libtinfo_p.a
  5. crtend_android.o    libEGL.so        libjnigraphics.so   libmenu_p.a       libOpenSLES.so  libstdc++.so      libz.so
  6. crtend_so.o         libform.a        liblog.so           libm_hard.a       libpanel.a      libthread_db.so   pkgconfig
  7. engines             libform_g.a      libm.a              libm.so           libpanel_g.a    libtic.a          terminfo
  8. libandroid.so       libform_p.a      libmariadbclient.a  libmysqlclient.a  libpanel_p.a    libtic_g.a
  9. libc.a              libGLESv1_CM.so  libmariadb.so       libncurses.a      libreadline.a   libtic_p.a
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Note that the 'libmysqlclient.a' file is actually a symlink to libmariadbclient.a (IIRC, the API is the exact same, and so all symbols should line up. This does not happen out of the box, I made the symlink manually). Why is the qt5 configure script complaining about these missing libs (especially pthread and rt)?