[LyX/master] Remove direct calls of exit()

[Georg Baum]

commit ca6fba31fbc44e4b4ed6457b16f3f0d2ee28b7f0
Author: Georg Baum <b...@lyx.org>
Date:   Fri Jan 9 21:43:45 2015 +0100

    Remove direct calls of exit()
    
    This is a preparation for using QCoreApplication.

diff --git a/src/tex2lyx/tex2lyx.cpp b/src/tex2lyx/tex2lyx.cpp
index 8f9d6ae..dc46770 100644
--- a/src/tex2lyx/tex2lyx.cpp
+++ b/src/tex2lyx/tex2lyx.cpp
@@ -482,13 +482,13 @@ void read_environment(Parser & p, string const & begin,
  * has almost all of them listed. For the same reason the reLyX-specific
  * reLyXre environment is ignored.
  */
-void read_syntaxfile(FileName const & file_name)
+bool read_syntaxfile(FileName const & file_name)
 {
        ifdocstream is(file_name.toFilesystemEncoding().c_str());
        if (!is.good()) {
                cerr << "Could not open syntax file \"" << file_name
                     << "\" for reading." << endl;
-               exit(2);
+               return false;
        }
        // We can use our TeX parser, since the syntax of the layout file is
        // modeled after TeX.
@@ -514,6 +514,7 @@ void read_syntaxfile(FileName const & file_name)
                        }
                }
        }
+       return true;
 }
 
 
@@ -1047,9 +1048,11 @@ int main(int argc, char * argv[])
                cerr << "Error: Could not find syntax file \"syntax.default\"." 
<< endl;
                return EXIT_FAILURE;
        }
-       read_syntaxfile(system_syntaxfile);
+       if (!read_syntaxfile(system_syntaxfile))
+               return 2;
        if (!syntaxfile.empty())
-               read_syntaxfile(makeAbsPath(syntaxfile));
+               if (!read_syntaxfile(makeAbsPath(syntaxfile)))
+                       return 2;
 
        // Read the encodings table.
        FileName const symbols_path = libFileSearch(string(), "unicodesymbols");