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Index: gcc-4.2/gcc/gengtype-lex.l
===================================================================
--- gcc-4.2/gcc/gengtype-lex.l (revision 121000)
+++ gcc-4.2/gcc/gengtype-lex.l (working copy)
@@ -535,13 +535,19 @@
macro_input (char *buffer, unsigned size)
{
unsigned result;
+ int old_errno;
result = fread (buffer, 1, size, yyin);
+ old_errno = errno;
if (result)
/*NOP*/;
- else if (ferror (yyin))
- YY_FATAL_ERROR ("read of source file failed");
- else if (macro_expns)
+ else if (ferror (yyin)) {
+ char *err_msg;
+ err_msg = xasprintf ("read of source file '%s:%d' failed",
+ lexer_line.file,
+ lexer_line.line);
+ YY_FATAL_ERROR (err_msg);
+ } else if (macro_expns)
{
const char *expn;
unsigned len;
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