On Wed, 2023-08-30 at 02:21 +0200, Andy via Gcc-help wrote: > C90 mode allows GNU extensions, I I care about clean C90 because I try > to write C90 ANTLR grammar. Pedantic mode helps. > Standard header uses GNU extensions (?) and if I preprocess file, it > wii: > - pedantic mode change preprocessed file and no GNU extension in this > file No. > - in the preprocessed file will GNU extensions. Yes. > I have questions: if in a preprocessed file will GNU extensions. it > compile with Pedantic mode? It depends on what a "preprocessed file" is. Normally the preprocessed file outputted by GCC contains linemarkers like # 1 "/usr/include/stdio.h" 1 3 4 here "3" means the following text comes from a system header file, so pedantic warnings are disabled. But if the preprocessed file is generated with "gcc -E -P", then linermarkers are removed by "-P" so the pedantic warnings will alarm. -- Xi Ruoyao <xry111@xxxxxxxxxxx> School of Aerospace Science and Technology, Xidian University
