为什么Qt Configure在交叉编译时无法在目标上找到正确的MySQL安装？

Question

我想建立MySQL驾驶员在交叉编译Qt5的Arm(Raspberry Pi)。

• 为了检查MySQL目标上的客户端库安装，我们运行：

pi@raspberrypi:~ $ mysql_config --version
10.1.38
pi@raspberrypi:~ $ mysql_config --include
-I/usr/include/mysql
pi@raspberrypi:~ $ mysql_config --libs
-L/usr/lib/arm-linux-gnueabihf  -lmariadbclient -lpthread -lz -lm -ldl

• 我们这样配置Qt：

../configure -opengl es2 -device linux-rpi3-g++ -device-option CROSS_COMPILE=$RPI_TOOLCHAIN -no-use-gold-linker -qt-xcb -xcb -sysroot $RPI_SYSROOT -opensource -confirm-license -nomake examples -nomake tests -release -make libs -prefix /usr/local/qt5pi -sql-mysql -recheck-all

• 配置将抛出错误：

ERROR: Feature 'sql-mysql' was enabled, but the pre-condition 'libs.mysql' failed

注意：

• 如果我们看一下，config.log似乎Qt Configure会在主机而不是sysroot或target中寻找MySQL！

[...]
looking for library mysql
Trying source 0 (type mysqlConfig) of library mysql ...
mysql_config not found.
=> source produced no result.
Trying source 1 (type mysqlConfig) of library mysql ...
mysql_config not found.
=> source produced no result.
Trying source 2 (type mysqlConfig) of library mysql ...
mysql_config not found.
=> source produced no result.
Trying source 3 (type mysqlConfig) of library mysql ...
mysql_config not found.
=> source produced no result.
Trying source 4 (type inline) of library mysql ...
None of [libmysqlclient_r.so libmysqlclient_r.a] found in [] and global paths.
=> source produced no result.
Trying source 5 (type inline) of library mysql ...
=> source failed condition 'config.win32'.
Trying source 6 (type inline) of library mysql ...
None of [libmysqlclient.so libmysqlclient.a] found in [] and global paths.
=> source produced no result.
test config.qtbase_sqldrivers.libraries.mysql FAILED
[...]

你有什么建议？

更新19年4月4日

似乎是一个已报告的错误：

• QTBUG-42284
• QTBUG-50244

但仍然没有解决！，正在寻找解决方法...

Answer 1

安装后，删除“config.cache”并重试。