https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123737
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I guess we need to get rid of the CPP_EMBED in comma expression optimization
unless we are guaranteed that expression has integral type.
/* Parse the next assignment-expression. */
if (cp_lexer_next_token_is (parser->lexer, CPP_EMBED))
{
/* Users aren't interested in milions of -Wunused-value
warnings when using #embed inside of a comma expression,
and one CPP_NUMBER plus CPP_COMMA before it and one
CPP_COMMA plus CPP_NUMBER after it is guaranteed by
the preprocessor. Thus, parse the whole CPP_EMBED just
as a single INTEGER_CST, the last byte in it. */
tree raw_data = cp_lexer_peek_token (parser->lexer)->u.value;
location_t loc = cp_lexer_peek_token (parser->lexer)->location;
cp_lexer_consume_token (parser->lexer);
assignment_expression
= *raw_data_iterator (raw_data, RAW_DATA_LENGTH (raw_data) - 1);
assignment_expression.set_location (loc);
}
So, if expression doesn't have integral type, we need to do lots of
build_x_compound_expr calls rather than just one for the whole CPP_EMBED.
