g++ with absolut path for errors / warnings

Discussion in 'C++' started by Philipp Kraus, Dec 8, 2010.

  1. Hello,

    I use a Scons script for compiling my sources with g++. Can I set a
    command line flag of g++ to see the full path on warning or error
    messages? I use relative paths for compiling the source, but I need
    messages with a absolute path.

    Thanks a lot

    Philipp Kraus, Dec 8, 2010
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  2. Philipp Kraus

    Jorgen Grahn Guest

    If it's not document in the exhaustive reference manual, then most
    likely "no". It's not something people generally need.

    Jorgen Grahn, Dec 11, 2010
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  3. Not really C++ related, but IIRC g++ will output warnings and errors
    with absolute paths if you give it absolute paths. I know you just
    said that you work in terms of relative paths, but does Scons have a
    function to convert a path to an absolute path which you could call on
    all of the paths right before you give it to g++?
    Joshua Maurice, Dec 12, 2010
  4. Philipp Kraus

    Jorgen Grahn Guest

    It almost certainly does -- trying to find a name for and trim the
    current working directory would be a lot of effort, with uncertain
    outcome, and would be surprising from a user interface perspective.

    Still, his need for the absolute path smells like a design error --
    one that will come back and haunt him later even if he solves this
    one. It reminds me a bit of Windows-based build setups I've seen,
    where you couldn't build unless you arranged your DOS drive letters in
    a very specific way :-/

    Jorgen Grahn, Dec 12, 2010
  5. I compile my code via external targets under XCode 3.2 and would like
    to get the errors within the source code. On XCode Version changing <
    3.2 to 3.2 it seems, that the inline errors are shown always if the
    compiler returns errors with absolut path names. I have tried now to
    change the input path names to absolut pathes, but it doesn't work,
    because the include within the sources are relative. The source will be
    compiled but all errors are with relative path names and so XCode can't
    parse them for inline showing.

    Philipp Kraus, Dec 12, 2010
  6. Philipp Kraus

    Ian Collins Guest

    You should really be asking this on a tool specific list, it isn't a C++
    language issue.
    Ian Collins, Dec 12, 2010
  7. I have hopen that anyone has the same problems. On the Apple
    mailinglist the problem can be found
    http://discussions.apple.com/message.jspa?messageID=10439497 but the
    the hint with absolut pathes does not work. I have template classes and
    a lot of "inline" declaration. I pass absolute pathes to gcc, but the
    returning error messages relative pathes. I think because the includes
    in the file are relative.

    Thanks a lot

    Philipp Kraus, Dec 13, 2010
  8. Philipp Kraus

    Miles Bader Guest

    Can you just pass the compiler / make output through a simple text
    filter that makes relative pathnames absolute?

    E.g., instead of running "make", you coudl run "make 1>&2 | my_filter",
    and my_filter would prepend the current directory to any relative
    filenames in error messages it sees.

    Miles Bader, Dec 13, 2010
  9. Sure you passed all of the paths as absolute paths, including the
    include paths as absolute paths? Was the error message in a standard
    header or in a header which was found from an explicit include path
    command line option? Just curious.
    Joshua Maurice, Dec 13, 2010
  10. I can't use absolute path names, because the source files are
    cross-plattform within a subversion. On a MS system I need a drive
    letter on unix system I have only directories. Scons can create on a
    file the correct absolut path with drive letter on MS and leading slash
    on unix systems, but Scons call the compiler only for the cpp files,
    not for my hpps.
    No, my code works, but I insert in my hpps an error to test the message
    bubbles of XCode. So XCode runs the external target, that calls Scons
    (works like makefiles) and should be insert the compiler error message
    on that position where I have inserted the error.

    My main program has a include with "#include <myheader.hpp>", so the
    Scons script create a main.o but the #include has an relative path, so
    an error is shown also as relative path and XCode does not parse this.

    I have posted a message on the Apple mailinglist and hope that somebody
    can help me. I can do my work, but it's not a good solution.

    Philipp Kraus, Dec 13, 2010
  11. Philipp Kraus

    Öö Tiib Guest

    I have had similar problem using VS as IDE to cross-compile for an
    embedded system. When you double click in VS onto error or warning
    message it opens the file at described position; that is handy. It
    assumes specific pattern that MSVC outputs as error or warning
    messages. That pattern assumed absolute path to file but compiler for
    that embedded device did output relative paths.

    Solution was quite simple perl script that was made to be called by
    makefile to postprocess the compiler output and translate the error
    messages into edible for VS. It is quite likely that you can do
    something similar with that XCode of yours.
    Öö Tiib, Dec 13, 2010
  12. Philipp Kraus

    Jorgen Grahn Guest

    I suggest you report the bug in XCode, and switch to some other tool
    if it's not fixed and you need it to work. All other editors work
    fine with g++, so I doubt the GCC people will compensate for someone
    else's bug.

    A workaround or glue layer from your side seems error-prone and ugly.

    Jorgen Grahn, Dec 13, 2010
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