Pedro Alves 9dff6a5d54 Delay checking whether /proc/pid/mem is writable (PR gdb/29907)
As of 1bcb0708f229 ("gdb/linux-nat: Check whether /proc/pid/mem is
writable"), GDB checks if /proc/pid/mem is writable.  This is done
early at GDB startup, in order to get a consistent warning, instead of
a warning that depends on whenever GDB writes to inferior memory.

PR gdb/29907 points out that some build systems (like QEMU's,
apparently) may call 'gdb --version' to check GDB's presence & its
version on the system, and that Gentoo's build process has sandboxing
which blocks the /proc/pid/mem access and thus GDB warns, which
results in build fails.

To help with that, this patch delays the /proc/pid/mem check until we
start or attach to an inferior.  Ends up potentially emiting a warning
close where we already emit other ptrace- and /proc- related warnings,
which just Feels Right.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29907
Change-Id: I5537653ecfbbe76a04ab035e40e59d09b4980763
2022-12-16 16:04:58 +00:00
2022-12-16 00:01:08 +00:00
2022-11-15 15:24:29 -08:00
2020-09-25 10:24:44 -04:00
2022-07-08 10:41:07 +01:00
2022-09-28 13:37:31 +09:30
2022-12-14 21:45:04 +10:30
2022-07-09 20:10:47 +09:30
2022-01-28 08:25:42 -05:00
2022-11-15 15:24:29 -08:00
2022-11-15 15:24:29 -08:00

		   README for GNU development tools

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

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.
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