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Message-ID: <20160716155223.GA18653@openwall.com>
Date: Sat, 16 Jul 2016 18:52:23 +0300
From: Solar Designer <solar@...nwall.com>
To: owl-users@...ts.openwall.com
Subject: building new gcc
Hi,
I just thought I'd share:
Building recent gcc (with ASan) on Owl-current or 3.1-stable currently
requires two hacks:
1. Adding new PT_* defines to /usr/include/sys/ptrace.h from newer
glibc, or alternatively adding them into the gcc tree:
/* Set ptrace filter options. */
PTRACE_SETOPTIONS = 0x4200,
#define PT_SETOPTIONS PTRACE_SETOPTIONS
/* Get last ptrace message. */
PTRACE_GETEVENTMSG = 0x4201,
#define PT_GETEVENTMSG PTRACE_GETEVENTMSG
/* Get siginfo for process. */
PTRACE_GETSIGINFO = 0x4202,
#define PT_GETSIGINFO PTRACE_GETSIGINFO
/* Set new siginfo for process. */
PTRACE_SETSIGINFO = 0x4203
#define PT_SETSIGINFO PTRACE_SETSIGINFO
Of course, don't forget to add a comma after "PTRACE_SYSCALL = 24",
which is the last definition in that enum currently.
2. Passing "--disable-nls" to configure, although this might be working
around a bug in recent gcc snapshots rather than an Owl compatibility
issue. My gcc build script contains:
---
#!/bin/sh
set -ex
V=$1
D=gcc-$V
F=gcc-$V.tar.bz2
I=/home/gcc/$D
rm -r $D || :
tar xf $F
cd $D
mkdir objdir
cd objdir
rmdir $I || :
mkdir $I
../configure --prefix=$I --disable-multilib --enable-languages=c --disable-nls
nice -n 19 time make -j8
nice -n 19 time make install
---
and a wrapper script for building multiple gcc versions:
---
#!/bin/sh
for V in 7-20160710 5.4.0 6.1.0 5.3.0 5.2.0 5.1.0 4.9.3; do
time ./build-gcc $V 2>&1 | tee $V.log
done
---
These scripts successfully built the listed gcc versions (including the
latest gcc 7 snapshot) on Owl yesterday. I tested x86_64 only.
This is for building and installing under a "gcc" pseudo-user. To use
gcc built in this way, you'll likely need to modify PATH and optionally
LD_LIBRARY_PATH (such as to use ASan). Some commands I used for
building and testing passwdqc utilities with ASan:
PATH=~gcc/gcc-7-20160710/bin:$PATH make
LD_LIBRARY_PATH=.:~gcc/gcc-7-20160710/lib64 ./pwqgen
I included "." in LD_LIBRARY_PATH as well because of passwdqc
specifics: it has a library of its own. For many other programs it'd be
just "LD_LIBRARY_PATH=~gcc/gcc-7-20160710/lib64".
Maybe someone will find this helpful.
Alexander
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