For convenience with some Windows editors, the other Go compiler was
modified to permit a byte-order-mark (0xfeff) at the start of a .go
file. This byte-order-mark is meaningless when using UTF-8, but
apparently some editors introduce it anyhow. This patch changes the
gccgo frontend to also ignore the mark at the start of a file.
Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline. Will commit to 4.7 branch when it is open for
commits.
Ian
diff -r 858f39eca5c5 go/lex.cc
--- a/go/lex.cc Tue Sep 18 22:24:35 2012 -0700
+++ b/go/lex.cc Wed Sep 19 08:45:16 2012 -0700
@@ -722,7 +722,16 @@
unsigned int ci;
bool issued_error;
this->lineoff_ = p - this->linebuf_;
- this->advance_one_utf8_char(p, &ci, &issued_error);
+ const char *pnext = this->advance_one_utf8_char(p, &ci,
+ &issued_error);
+
+ // Ignore byte order mark at start of file.
+ if (ci == 0xfeff && this->lineno_ == 1 && this->lineoff_ == 0)
+ {
+ p = pnext;
+ break;
+ }
+
if (Lex::is_unicode_letter(ci))
return this->gather_identifier();
