From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 5751 invoked by alias); 21 Jan 2015 21:16:05 -0000 Mailing-List: contact gdb-prs-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-prs-owner@sourceware.org Received: (qmail 5690 invoked by uid 48); 21 Jan 2015 21:15:59 -0000 From: "dtaylor at emc dot com" To: gdb-prs@sourceware.org Subject: [Bug symtab/17866] New: incremental read missing header files Date: Wed, 21 Jan 2015 21:16:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gdb X-Bugzilla-Component: symtab X-Bugzilla-Version: 7.8 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: dtaylor at emc dot com X-Bugzilla-Status: NEW X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: unassigned at sourceware dot org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter cc Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://sourceware.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-q1/txt/msg00113.txt.bz2 https://sourceware.org/bugzilla/show_bug.cgi?id=17866 Bug ID: 17866 Summary: incremental read missing header files Product: gdb Version: 7.8 Status: NEW Severity: normal Priority: P2 Component: symtab Assignee: unassigned at sourceware dot org Reporter: dtaylor at emc dot com CC: dtaylor at emc dot com When using DWARF debug information, and incremental (the default) reading of debug information, GDB will oftentimes miss header files until the user visits a file that includes, directly or indirectly, the header file. Example (the following is a constructed example; the actual problem is seen when building our embedded kernel that does not include system header files): main.c: ------- extern void print_hello (void); int main (int argc, char *argv[]) { print_hello (); return (0); } hello.c: -------- #include void print_hello (void) { printf ("Hello, world\n"); } build thusly: ------------- gcc -c -g3 -O3 main.c gcc -c -g3 -O3 hello.c gcc -o missing-headers main.o hello.o Run gdb: -------- gdb missing-headers At prompt, type: ---------------- (gdb) info sources Source files for which symbols have been read in: /emc/dtaylor/bugs/missing-headers/main.c Source files for which symbols will be read in on demand: /usr/include/bits/stdio2.h, /emc/dtaylor/bugs/missing-headers/hello.c (gdb) list features.h:1 No source file named features.h. (gdb) list hello.c:1 1 #include 2 3 void 4 print_hello (void) 5 { 6 printf ("Hello, world\n"); 7 } (gdb) info sources Source files for which symbols have been read in: /emc/dtaylor/bugs/missing-headers/hello.c, /usr/include/stdio.h, /usr/include/features.h, /usr/include/bits/predefs.h, /usr/include/sys/cdefs.h, /usr/include/bits/wordsize.h, /usr/include/gnu/stubs.h, /usr/include/gnu/stubs-64.h, /usr/lib/gcc/x86_64-linux-gnu/4.4/include/stddef.h, /usr/include/bits/types.h, /usr/include/bits/typesizes.h, /usr/include/libio.h, /usr/include/_G_config.h, /usr/include/wchar.h, /usr/lib/gcc/x86_64-linux-gnu/4.4/include/stdarg.h, /usr/include/bits/stdio_lim.h, /usr/include/bits/sys_errlist.h, /usr/include/bits/stdio.h, /usr/include/bits/stdio2.h, /emc/dtaylor/bugs/missing-headers/main.c Source files for which symbols will be read in on demand: /usr/include/bits/stdio2.h (gdb) list features.h:1 1 /* Copyright (C) 1991-1993,1995-2007,2009,2010 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of (gdb) I did this with the 7.9 pre-release (to make sure that there wasn't a bug fix that I missed), but the same problem occurs in 7.8 and earlier versions. By contrast, with STABS most (all?) headers are found without the need to first 'visit' a file thst includes them. The above was done on an x86-64 GNU/Linux system, though I doubt that that matters much to duplicating the problem. -- You are receiving this mail because: You are on the CC list for the bug.