(gcc-300.info)Language Independent Options


Options to Control Diagnostic Messages Formatting
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   Traditionally, diagnostic messages have been formatted irrespective
of the output device's aspect (e.g. its width, ...).  The options
described below can be used to control the diagnostic messages
formatting algorithm, e.g. how many characters per line, how often
source location information should be reported.  Right now, only the
C++ front end can honor these options.  However it is expected, in the
near future, that the remaining front ends would be able to digest them
correctly.

`-fmessage-length=N'
     Try to format error messages so that they fit on lines of about N
     characters.  The default is 72 characters for `g++' and 0 for the
     rest of the front ends supported by GCC.  If N is zero, then no
     line-wrapping will be done; each error message will appear on a
     single line.

`-fdiagnostics-show-location=once'
     Only meaningful in line-wrapping mode.  Instructs the diagnostic
     messages reporter to emit _once_ source location information; that
     is, in case the message is too long to fit on a single physical
     line and has to be wrapped, the source location won't be emitted
     (as prefix) again, over and over, in subsequent continuation
     lines.  This is the default behaviour.

`-fdiagnostics-show-location=every-line'
     Only meaningful in line-wrapping mode.  Instructs the diagnostic
     messages reporter to emit the same source location information (as
     prefix) for physical lines that result from the process of breaking
     a message which is too long to fit on a single line.


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