GNU bug report logs - #15780
24.3; flymake may fail on symlinked files

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Slaven Rezic <slaven <at> rezic.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; flymake may fail on symlinked files
Date: Fri, 01 Nov 2013 09:55:30 +0100

flymake fails for the following setup.

First, create a file/directory/symlink setup:

    mkdir -p /tmp/flymaketest/mnt/home
    cd /tmp/flymaketest
    ln -s mnt/home
    touch mnt/home/test.pl

Now start emacs:

    emacs -q

Load the test file using the _symlinked_ path:

    C-x C-f /tmp/flymaketest/home/test.pl

Start flymake:

    M-x flymake-mode

An error dialog shows up:

    Flymake: Configuration error has occurred while running (perl -wc ../mnt/home/test_flymake.pl). Flymake will be switched OFF

Loading the file with the non-symlinked path
/tmp/flymaketest/mnt/home/test.pl and turning on flymake works.

I think the problem is that flymake-create-temp-inplace is using
file-truename now, but for creating the relative file name in, say,
flymake-perl-init file-truename is not used. My current workaround is to
patch flymake-perl-init like this:

      (defun flymake-perl-init ()
	(let* ((temp-file   (flymake-init-create-temp-buffer-copy
			     'flymake-create-temp-inplace))
	       (local-file  (file-relative-name
			     temp-file
			     (file-truename (file-name-directory buffer-file-name)))))
	  (list "perl" (list "-wc " local-file))))

A real solution would need also changes for the other flymake-*-init
functions.

Regards,
    Slaven



In GNU Emacs 24.3.1 (amd64-portbld-freebsd9.1, GTK+ Version 2.24.19)
 of 2013-08-12 on 9-89993
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
Configured using:
 `configure '--localstatedir=/var' '--with-x-toolkit=gtk2' '--with-xft'
 '--with-m17n-flt' '--with-otf' '--with-imagemagick' '--with-gsettings'
 '--with-gconf' '--with-xim' '--with-sound' '--with-dbus' '--with-xml2'
 '--with-gnutls' '--x-libraries=/usr/local/lib'
 '--x-includes=/usr/local/include' '--prefix=/usr/local'
 '--mandir=/usr/local/man' '--infodir=/usr/local/info/'
 '--build=amd64-portbld-freebsd9.1'
 'build_alias=amd64-portbld-freebsd9.1' 'CC=cc' 'CFLAGS=-O2 -pipe
 -fno-strict-aliasing' 'LDFLAGS= -L/usr/local/lib
 -Wl,-rpath=/usr/lib:/usr/local/lib' 'CPPFLAGS=-I/usr/local/include'
 'CPP=cpp''

Important settings:
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  value of $LC_TIME: C
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-- 
Slaven Rezic - slaven <at> rezic <dot> de

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