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Patrick Palka ebfd00d210 Fix PR gdb/17820
This patch is a comprehensive fix for PR 17820 which reports that
using "set history size unlimited" inside one's gdbinit file doesn't
really work.

There are three small changes in this patch.  The most important change
this patch makes is to decode the argument of the "size" subcommand
using add_setshow_zuinteger_unlimited_cmd() instead of using
add_setshow_uinteger_cmd().  The new decoder takes an int * and maps
unlimited to -1 whereas the old decoder takes an unsigned int * and maps
unlimited to UINT_MAX.  Using the new decoder simplifies our handling of
unlimited and makes it easier to interface with readline which itself
expects a signed-int history size.

The second change is the factoring of the [stifle|unstifle]_history logic
into a common function which is now used by both init_history() and
set_history_size_command().  This is technically the change that fixes
the PR itself.

Thirdly, this patch initializes history_size_setshow_var to -2 to mean
that the variable has not been set yet.  Now init_history() tests for -2
instead of 0 to determine whether to give the variable a default value.
This means that having "set history size 0" in one's gdbinit file will
actually keep the history size at 0 and not reset it to 256.

gdb/ChangeLog:

	PR gdb/17820
	* top.c (history_size_setshow_var): Change type to signed.
	Initialize to -2.  Update documentation.
	(set_readline_history_size): Define.
	(set_history_size_command): Use it.  Remove logic for handling
	out-of-range sizes.
	(init_history): Use set_readline_history_size().  Test for a
	value of -2 instead of 0 when determining whether to set a
	default history size.
	(init_main): Decode the argument of the "size" command as a
	zuinteger_unlimited.

gdb/testsuite/ChangeLog:

	PR gdb/17820
	* gdb.base/gdbinit-history.exp: New test.
	* gdb.base/gdbinit-history/unlimited/.gdbinit: New file.
	* gdb.base/gdbinit-history/zero/.gdbinit: New file.
2015-05-13 09:26:54 -04:00
bfd Automatic date update in version.in 2015-05-13 00:00:07 +00:00
binutils Return ELF_CLASS_BOTH by default 2015-05-13 03:57:46 -07:00
config Set zlibdir/zlibinc with top_builddir/top_srcdir 2015-04-02 05:43:07 -07:00
cpu or1k: add missing l.msync, l.psync and l.psync instructions. 2014-07-20 20:26:09 +03:00
elfcpp Add chdr_size, Chdr, Chdr_write and Chdr_data 2015-04-08 10:29:40 -07:00
etc PR external/{16327,16328}: Remove etc/configure.texi and etc/standards.texi. 2014-06-27 11:33:25 +02:00
gas Revert "Add -mno-shared to x86 assembler" 2015-05-13 04:47:59 -07:00
gdb Fix PR gdb/17820 2015-05-13 09:26:54 -04:00
gold Change Section_id type to use Relobj* instead of Object*. 2015-05-02 08:43:27 -07:00
gprof Updated translations for various binutils components. 2015-04-29 16:26:14 +01:00
include [AArch64] Add R_AARCH64_P32_LD32_GOTPAGE_LO14 to elf header 2015-05-12 13:47:15 +01:00
intl
ld Add missing ChangeLog entries for PR binutis/18386 2015-05-13 04:33:45 -07:00
libdecnumber Another part of fixing "make TAGS". 2015-01-22 21:07:31 +02:00
libiberty libiberty/mkstemps.c: Include <time.h> if <sys/time.h> not available. 2015-05-08 10:15:28 -07:00
opcodes Add missing ChangeLog entries for PR binutis/18386 2015-05-13 04:33:45 -07:00
readline Fix executable indicator in file name completion on Windows. 2014-12-30 21:14:25 +02:00
sim Switch erc32 simulator copyright headers to FSF. 2015-05-08 07:23:15 -07:00
texinfo
zlib Add missing ChangeLog entry 2015-03-31 13:15:01 -07:00
.cvsignore
.gitattributes Add a .gitattributes file for use with git-merge-changelog 2014-07-25 18:07:23 -04:00
.gitignore Sync the root .gitignore file with GCC's. 2013-01-11 15:17:35 +00:00
ChangeLog Configure zlib with --enable-host-shared for shared bfd 2015-05-01 08:34:08 -07:00
compile Update from upstream Automake 2014-11-16 13:43:48 +01:00
config-ml.in Sync config-ml.in with GCC trunk 2015-03-17 05:15:34 -07:00
config.guess Update config.guess and config.sub to the latest upstream version 2015-03-30 16:28:14 -04:00
config.rpath
config.sub Update config.guess and config.sub to the latest upstream version 2015-03-30 16:28:14 -04:00
configure Configure zlib with --enable-host-shared for shared bfd 2015-05-01 08:34:08 -07:00
configure.ac Configure zlib with --enable-host-shared for shared bfd 2015-05-01 08:34:08 -07:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB 2013-10-01 Jeff Johnston <jjohnstn@redhat.com> 2013-10-01 18:14:04 +00:00
depcomp Update from upstream Automake 2014-11-16 13:43:48 +01:00
djunpack.bat
install-sh Update from upstream Automake 2014-11-16 13:43:48 +01:00
libtool.m4 Update libtool.m4 from GCC trunk 2014-11-24 09:14:09 -08:00
lt~obsolete.m4
ltgcc.m4
ltmain.sh PR target/59788 2014-02-06 11:01:57 +01:00
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS Update description of ownership of files in include/ 2014-11-04 16:14:14 -08:00
Makefile.def Configure zlib with --enable-host-shared for shared bfd 2015-05-01 08:34:08 -07:00
Makefile.in Configure zlib with --enable-host-shared for shared bfd 2015-05-01 08:34:08 -07:00
Makefile.tpl Update top-level files from GCC trunk 2015-03-16 09:12:37 -07:00
makefile.vms
missing Update from upstream Automake 2014-11-16 13:43:48 +01:00
mkdep
mkinstalldirs Update from upstream Automake 2014-11-16 13:43:48 +01:00
move-if-change Update `move-if-change' from gnulib 2014-11-16 17:04:02 +01:00
README
README-maintainer-mode
setup.com
src-release.sh Adjust src-release.sh for sim using the gdb create-version.sh. 2015-04-15 04:08:51 +02:00
symlink-tree
ylwrap Update from upstream Automake 2014-11-16 13:43:48 +01:00

		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

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	./configure 
	make

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then do:
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(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
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If you have more than one compiler on your system, it is often best to
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	CC=gcc ./configure
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A similar example using csh:

	setenv CC gcc
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