gcc-you can use this code to learn something about gcc, and inquire further into linux,
源代码在线查看： if-mpar.c
/* Copyright (C) 2000 Free Software Foundation, Inc. */ /* Test various combinations of missing parentheses give the correct missing parenthesis message. */ /* { dg-do preprocess } */ #if (1 /* { dg-error "missing '\\)'" "missing ')' no. 1" } */ #endif #if 2 * (3 + 4 /* { dg-error "missing '\\)'" "missing ')' no. 2" } */ #endif #if (2)) /* { dg-error "missing '\\('" "missing '(' no. 1" } */ #endif #if ) /* { dg-error "missing '\\('" "missing '(' no. 2" } */ #endif #if 4) /* { dg-error "missing '\\('" "missing '(' no. 3" } */ #endif #if ( /* { dg-error "missing '\\)'" "missing ')' no. 3" } */ #endif
