go-sql-driver / mysql / 6624041993

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Allow to change (or disable) the default driver name for registration (#1499)

A link variable now allows to change or disable the name of the driver
that is automatically registered with database/sql:

Change driver name:
    go build "-ldflags=-X github.com/go-sql-driver/mysql.driverName=custom"

Disable driver registration (set driverName to empty string):
    go build "-ldflags=-X github.com/go-sql-driver/mysql.driverName="

In the same way, a variable overridable at link time is also provided to
override the driver name used in the test suite. This allows to run our
test suite on another driver.

    go test "-ldflags=-X github.com/go-sql-driver/mysql.driverNameTest=custom"

driverName is propagated to driverNameTest unless driverNameTest is
explicitely defined.

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