gcc, clang, and MSVC all use lowercase "warning:", "error:" and
"note:". Follow that standard.
Also, include a column number; just print 1, as the Symbol doesn't
give us a column number, and searching backwards for a newline seems
overkill.
This fixes IDE integrations that parse compiler output using regular
expressions.
The test checks for moc output, but most tests were so far only
running on Linux systems. Expand this to Unix for most tests, which
then includes macOS.
Change-Id: I0a6151cc0dc50e52ca72ff8048a45213aebdb3a8
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
f9058a7534