From 8133e1526750ab74ca4d5180fb140a7e172d473f Mon Sep 17 00:00:00 2001 From: Sergei Trofimovich Date: Sat, 8 Aug 2020 23:43:12 +0100 Subject: [PATCH] Lexer: allow zeros as line numbers in preprocessed directives Starting from `gcc-11` initial line numbers not related to actual files are marked as zeros. See the "preprocessor: Better line info for & " https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=6bf2ff0d52a9 language-c's grammar did not allow it (by accident) ``` Prelude> Language.C.parseC (Data.ByteString.Char8.pack "# 0 \"/dev/null\"\n") Language.C.nopos Left :: [ERROR] >>> Syntax Error ! Lexical error ! The character '#' does not fit here. ``` The change allows '0' in line numbers as well. Closes: https://github.com/visq/language-c/issues/74 Signed-off-by: Sergei Trofimovich --- src/Language/C/Parser/Lexer.x | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/src/Language/C/Parser/Lexer.x +++ b/src/Language/C/Parser/Lexer.x @@ -147,7 +147,7 @@ $white+ ; -- -- * see https://gcc.gnu.org/onlinedocs/cpp/Preprocessor-Output.html -- -\#$space*@int$space*(\"($infname|@charesc)*\"$space*)?(@int$space*)*\r?$eol +\#$space*@digits$space*(\"($infname|@charesc)*\"$space*)?(@int$space*)*\r?$eol { \pos len str -> setPos (adjustLineDirective len (takeChars len str) pos) >> lexToken' False } -- #pragma directive (K&R A12.8) -- 2.28.0