Fix QMAKE_CXX/CROSS_COMPILE verification with ccache

The use of ccache leads to QMAKE_CXX definitions of the form:

    QMAKE_CXX = $${CCACHE} $${CROSS_COMPILE}g++

The previous test required QMAKE_CXX to be a single valid (absolute or
QMAKE_PATH_ENV-relative) path to an existing file, which was not
compatible with definitions of QMAKE_CXX like the one above.

Fix this by using only the first value in QMAKE_CXX, which usually
points to the compiler executable, or to the ccache executable in the
above case.

Task-number: QTBUG-47951
Change-Id: Iade3136f03493593b067fb7742fb997f92377425
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

0 files changed, 0 insertions, 0 deletions