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Improve linker symbol redefinition error messages

Now, the object file in which each definition is (as well as the source
file and line) are printed with the error message.

Signed-off-by: Antonio Niño Díaz <[email protected]>

--- a/src/link/symbol.c

+++ b/src/link/symbol.c

@@ -95,7 +95,10 @@

 			if (nBank == -1)

 				return;

-			errx(1, "Symbol '%s' defined more than once", tzName);

+			errx(1, "'%s' in both %s : %s(%d) and %s : %s(%d)",

+				tzName, tzObjFileName, tzFileName, nFileLine,

+				(*ppSym)->tzObjFileName,

+				(*ppSym)->tzFileName, (*ppSym)->nFileLine);

 		}

 	}