(gcc.info.gz) Language Independent Options

(gcc.info.gz) Objective-C and Objective-C++ Dialect Options
 
 3.7 Options to Control Diagnostic Messages Formatting
 =====================================================
 
 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 behavior.
 
 `-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.
 
 `-fdiagnostics-show-option'
      This option instructs the diagnostic machinery to add text to each
      diagnostic emitted, which indicates which command line option
      directly controls that diagnostic, when such an option is known to
      the diagnostic machinery.
 
 `-Wcoverage-mismatch'
      Warn if feedback profiles do not match when using the
      `-fprofile-use' option.  If a source file was changed between
      `-fprofile-gen' and `-fprofile-use', the files with the profile
      feedback can fail to match the source file and GCC can not use the
      profile feedback information.  By default, GCC emits an error
      message in this case.  The option `-Wcoverage-mismatch' emits a
      warning instead of an error.  GCC does not use appropriate
      feedback profiles, so using this option can result in poorly
      optimized code.  This option is useful only in the case of very
      minor changes such as bug fixes to an existing code-base.
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