7a85168daf
Currently building gdb is impossible without an installed termcap or curses library. But, GDB already has a very minimal termcap in the tree to handle this situation for Windows -- gdb/stub-termcap.c. This patch makes that the fallback for all hosts. Testing this on GNU/Linux (by simply hacking away the termcap/curses detection in gdb/configure.ac), we trip on: ../readline/libreadline.a(terminal.o): In function `_rl_init_terminal_io': /home/pedro/gdb/mygit/src/readline/terminal.c:527: undefined reference to `PC' /home/pedro/gdb/mygit/src/readline/terminal.c:528: undefined reference to `BC' /home/pedro/gdb/mygit/src/readline/terminal.c:529: undefined reference to `UP' /home/pedro/gdb/mygit/src/readline/terminal.c:538: undefined reference to `PC' /home/pedro/gdb/mygit/src/readline/terminal.c:539: undefined reference to `BC' /home/pedro/gdb/mygit/src/readline/terminal.c:540: undefined reference to `UP' These are globals that are normally defined by termcap (or ncurses' termcap emulation). Now, we could just define replacements in stub-termcap.c, but readline/terminal.c (at least the copy in our tree) has this: #if !defined (__linux__) && !defined (NCURSES_VERSION) # if defined (__EMX__) || defined (NEED_EXTERN_PC) extern # endif /* __EMX__ || NEED_EXTERN_PC */ char PC, *BC, *UP; #endif /* !__linux__ && !NCURSES_VERSION */ which can result in readline defining the globals too. That will usually work out in C, given that "-fcommon" is usually the default for C compilers, but that won't work for C++, or C with -fno-common (link fails with "multiple definition" errors)... Mirroring those #ifdef conditions in the stub termcap screams "brittle" to me -- I can see them changing in latter readline versions. Work around that by simply using __attribute__((weak)). Windows/PE/COFF's do support weak, but not on gcc 3.4 based toolchains (4.8.x does work). Given the file never needed the variables while it was Windows-only, just continue not defining them there. All other supported hosts should support this. gdb/ChangeLog: 2015-04-06 Pedro Alves <palves@redhat.com> Bernd Edlinger <bernd.edlinger@hotmail.de> * configure.ac: Remove the mingw32-specific stub-termcap.o fallback, and instead fallback to the stub termcap on all hosts. * configure: Regenerate. * stub-termcap.c [!__MINGW32__] (PC, BC, UP): Define as weak symbols.
103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
/* A very minimal do-nothing termcap emulation stub.
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Copyright (C) 2005-2015 Free Software Foundation, Inc.
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Contributed by CodeSourcery, LLC.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include <stdlib.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* -Wmissing-prototypes */
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extern int tgetent (char *buffer, char *termtype);
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extern int tgetnum (char *name);
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extern int tgetflag (char *name);
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extern char* tgetstr (char *name, char **area);
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extern int tputs (char *string, int nlines, int (*outfun) (int));
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extern char *tgoto (const char *cap, int col, int row);
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#ifdef __cplusplus
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}
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#endif
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/* These globals below are global termcap variables that readline
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references.
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Actually, depending on preprocessor conditions that we don't want
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to mirror here (as they may change depending on readline versions),
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readline may define these globals as well, relying on the linker
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merging them if needed (-fcommon). That doesn't work with
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-fno-common or C++, so instead we define the symbols as weak.
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Don't do this on Windows though, as MinGW gcc 3.4.2 doesn't support
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weak (later versions, e.g., 4.8, do support it). Given this stub
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file originally was Windows only, and we only needed this when we
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made it work on other hosts, it should be OK. */
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#ifndef __MINGW32__
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char PC __attribute__((weak));
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char *BC __attribute__((weak));
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char *UP __attribute__((weak));
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#endif
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/* Each of the files below is a minimal implementation of the standard
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termcap function with the same name, suitable for use in a Windows
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console window, or when a real termcap/curses library isn't
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available. */
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int
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tgetent (char *buffer, char *termtype)
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{
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return -1;
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}
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int
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tgetnum (char *name)
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{
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return -1;
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}
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int
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tgetflag (char *name)
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{
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return -1;
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}
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char *
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tgetstr (char *name, char **area)
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{
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return NULL;
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}
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int
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tputs (char *string, int nlines, int (*outfun) (int))
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{
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while (*string)
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outfun (*string++);
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return 0;
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}
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char *
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tgoto (const char *cap, int col, int row)
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{
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return NULL;
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}
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