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Build instructions:
• my stdio-c99, arc4random¹ and mkstemp patches still aren’t merged,
which means we must disable C99 mode in gcc (see below) and add
an either tempnam or, preferred, mkstemp function
① while mksh doesn’t use arc4random(3) any longer, mkstemp() does
• the initial CVS checkout is passwordless, using ssh
% mkdir mkshklibctest mkshklibctest/builddir
% cd mkshklibctest
% env CVS_RSH=ssh cvs -d :ext:_anon...@anoncvs.mirbsd.org:/cvs \
co -PD"2010/08/29" mksh contrib/hosted/tg/deb/klibc
% cd builddir
% klcc -c -o arc4random.o ../contrib/hosted/tg/deb/klibc/arc4random.c
% klcc -c -o mkstemp.o ../contrib/hosted/tg/deb/klibc/mkstemp.c
% ar rcs libMKSTEMP.a arc4random.o mkstemp.o
% env HAVE_CAN_FSTACKPROTECTORALL=0 CFLAGS=-Wextra CC=klcc \
CPPFLAGS='-DMKSH_ASSUME_UTF8 -DMKSH_BINSHREDUCED -DMKSH_NO_LIMITS' \
HAVE_CAN_STDG99=0 HAVE_CAN_STDC99=0 LDFLAGS=-L. LIBS=-lMKSTEMP \
bash ../mksh/Build.sh -r
Explanation of the last line:
• HAVE_CAN_FSTACKPROTECTORALL=0 forces Build.sh to not check for
(and use, if found) -fstack-protector-all since that will pull
in libssp (with gcc4)
• CFLAGS=-Wextra (as long as it’s set to anything involving a
hyphen-minus) tells Build.sh to not use the default CFLAGS,
which include -O2 (or -O, or -xO2 with SUNWcc, etc.)
• CC=klcc should be obvious
• CPPFLAGS:
– -DMKSH_ASSUME_UTF8 enables UTF-8 mode by default; I checked
that the initramfs console is UTF-8 using Grml
– -DMKSH_BINSHREDUCED is needed by Debian and switches mksh
into the “sh” mode (set -o sh) if called as “sh” or “-sh”
which disables some Korn shell features
– -DMKSH_NO_LIMITS is needed for klibc and disables use of
getrlimit() and setrlimit() from the ulimit builtin
• HAVE_CAN_STDG99=0 HAVE_CAN_STDC99=0 disable -std={gnu,c}99
which are otherwise probed and used automatically, but the
klibc <stdio.h> still uses “extern inline” (gnu89 mode)…
• LDFLAGS=-L. LIBS=-lMKSTEMP pull in mkstemp() from earlier
• bash ../mksh/Build.sh ⇒ using GNU bash here for easiest
reproduction, building with srcdir ≠ objdir works
• -r disables automatic compilation of the manual page (speed)
Now the screen should look something like this:
│size mksh
│ text data bss dec hex filename
│ 155342 452 19352 175146 2ac2a mksh
[…]
│Run the regression test suite: ./test.sh
│Please also read the sample file dot.mkshrc and the fine manual.
Let’s see…
��...@frozenfish:~/mkshklibctest/builddir $ ./mksh -c true; echo $?
│0
��...@frozenfish:~/mkshklibctest/builddir $ ./mksh -c 'print $KSH_VERSION';
echo $?
│@(#)MIRBSD KSH R39 2010/08/28
│0
��...@frozenfish:~/mkshklibctest/builddir $ ./mksh -c 'echo one; ls -l mksh;
echo two'; echo $?
│one
│-rwxr-xr-x 1 tg tg 544120 Aug 29 14:46 mksh
Here it hangs – after running an external programme it doesn’t
come back. ^C kills it, usually.
��...@frozenfish:~/mkshklibctest/builddir $ ./test.sh -v
also won’t get far. ^C helps here as well to regain the tty.
Plan 9 and Syllable Desktop exhibited the same symptoms
last time I checked. Now, the interesting part, Haiku no
longer does: http://dev.haiku-os.org/ticket/5567
See also: http://dev.haiku-os.org/changeset/35836
Back when I applied the patches on top of 1.5.15-1 I could get
a working shell, interestingly enough. Now, 20-fix-getrusage is
applied and the kernel header situation changed, but this bug
seems to have crept in along the way.
This is a Debian sid (i386) chroot, a-g d-u’d today, on an etch system:
Linux […] 2.6.18-6-686 #1 SMP Fri Feb 19 23:40:03 UTC 2010 i686 GNU/Linux
Congratulations on klibc upstream maintainership, by the way,
and thanks for tracking this (I would like to ditch dietlibc
on quite some architectures or – better – replace the dash
that comes with klibc in its entirety; did so in Android…).
bye,
//mirabilos
- --
FWIW, I'm quite impressed with mksh interactively. I thought it was much
*much* more bare bones. But it turns out it beats the living hell out of
ksh93 in that respect. I'd even consider it for my daily use if I hadn't
wasted half my life on my zsh setup. :-) -- Frank Terbeck in #!/bin/mksh
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