PATCH RFA: -I existing-file should be a warning, not an error

PATCH RFA: -I existing-file should be a warning, not an error

[Ian Lance Taylor]

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> gcc -I some-random-string -c hello.c
=> no output, compilation successful

>  gcc -I hello.c -c hello.c
cc1: error: hello.c: not a directory
=> error message, compilation fails

I noticed this when I happened to create an executable with the same
name as the gcc source directory I was building.  The libgcc build
using -I with a ../.. during the build, and found the executable
rather than the source directory.  It all worked fine after I deleted
the executable.

I see no benefit to making this an error.  I propose the following
patch to make it a warning instead.  Bootstrapped and tested on
i686-unknown-linux-gnu.  OK for mainline?

Ian


2009-11-06  Ian Lance Taylor  <iant@google.com>

	* incpath.c (remove_duplicates): Change "not a directory"
	diagnostic from error to warning.



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Index: incpath.c
===================================================================
--- incpath.c	(revision 153981)
+++ incpath.c	(working copy)
@@ -239,7 +239,7 @@ remove_duplicates (cpp_reader *pfile, st
 	    }
 	}
       else if (!S_ISDIR (st.st_mode))
-	cpp_error_with_line (pfile, CPP_DL_ERROR, 0, 0,
+	cpp_error_with_line (pfile, CPP_DL_WARNING, 0, 0,
 			     "%s: not a directory", cur->name);
       else
 	{