gcc-you can use this code to learn something about gcc, and inquire further into linux,
源代码在线查看： multiline.c
/* Copyright (C) 2000 Free Software Foundation, Inc. */ /* { dg-do preprocess } */ /* { dg-options "-C" } */ /* Test that multi-line tokens are recognized by cpp0 as being multiline . Source: Neil Booth, 17 Dec 2000. */ /* Line 1 Line 2 Line 3 Line 4 */ "line 1 line 2 line 3 line 4" L"line 1 line 2 line 3 line 4" /* Nowhere in the output of this file should there be a blank line. We check for that in the .i file. { dg-final { if ![file exists multiline.i] { return } } } { dg-final { if \{ [grep multiline.i "^$"] == "" \} \{ } } { dg-final { return \} } } { dg-final { fail "multiline.c: multi-line tokens" } } */ /* { dg-error "missing term" "multiline strings" { target *-*-* } 11 } */ /* { dg-error "missing term" "multiline strings" { target *-*-* } 14 } */ /* { dg-error "missing term" "multiline strings" { target *-*-* } 15 } */ /* { dg-error "missing term" "multiline strings" { target *-*-* } 18 } */ /* { dg-bogus "warning" "warning in place of error" { target *-*-* } 11 } */ /* { dg-bogus "warning" "warning in place of error" { target *-*-* } 14 } */ /* { dg-bogus "warning" "warning in place of error" { target *-*-* } 15 } */ /* { dg-bogus "warning" "warning in place of error" { target *-*-* } 18 } */
