Commit 4ebc6a74 authored by Mans Rullgard's avatar Mans Rullgard

build: Plan 9 support

This adds support for building on Plan 9 x86-32.  The compat/plan9
directory contains these items:

- replacements for the 'head' and 'printf' shell commands
- wrapper for main() to disable FPU exceptions

Larger required changes to the system are described in the
Signed-off-by: 's avatarMans Rullgard <>
parent 80521c19
case "$1" in
-n) n=$2; shift 2 ;;
-n*) n=${1#-n}; shift ;;
exec sed ${n}q "$@"
* This file is part of Libav.
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
int plan9_main(int argc, char **argv);
#undef main
int main(int argc, char **argv)
/* The setfcr() function in lib9 is broken, must use asm. */
#ifdef __i386
short fcr;
__asm__ volatile ("fstcw %0 \n"
"or $63, %0 \n"
"fldcw %0 \n"
: "=m"(fcr));
return plan9_main(argc, argv);
exec awk "BEGIN { for (i = 2; i < ARGC; i++) printf \"$1\", ARGV[i] }" "$@"
......@@ -956,7 +956,7 @@ apply(){
cmp -s "$1" "$2" && echo "$2 is unchanged" && return
mkdir -p "$(dirname $2)"
cp -f "$1" "$2"
$cp_f "$1" "$2"
# CONFIG_LIST contains configurable options, while HAVE_LIST is for
......@@ -1753,6 +1753,7 @@ shlibdir_default="$libdir_default"
cp_f="cp -f"
ln_s="ln -sf"
nm_default="nm -g"
......@@ -2879,6 +2880,19 @@ case $target_os in
add_cppflags -D_C99_SNPRINTF_EXTENSION \
add_compat strtod.o strtod=avpriv_strtod
disable avserver
ln_s='ln -s -f'
......@@ -3531,6 +3545,12 @@ elif enabled msvc; then
enabled x86_32 && disable aligned_stack
case $target_os in
add_cppflags -Dmain=plan9_main
enabled_any $THREADS_LIST && enable threads
enabled asm || { arch=c; disable $ARCH_LIST $ARCH_EXT_LIST; }
......@@ -298,4 +298,67 @@ and for a build with shared libraries
./configure --target-os=mingw32 --enable-shared --disable-static --extra-cflags=-mno-cygwin --extra-libs=-mno-cygwin
@end example
@chapter Plan 9
The native @uref{, Plan 9} compiler
does not implement all the C99 features needed by Libav so the gcc
port must be used. Furthermore, a few items missing from the C
library and shell environment need to be fixed.
@item GNU awk, grep, make, and sed
Working packages of these tools can be found at
@uref{, ports2plan9}.
They can be installed with @uref{, 9front's} @code{pkg}
utility by setting @code{pkgpath} to
@item Missing/broken @code{head} and @code{printf} commands
Replacements adequate for building Libav can be found in the
@code{compat/plan9} directory. Place these somewhere they will be
found by the shell. These are not full implementations of the
commands and are @emph{not} suitable for general use.
@item Missing C99 @code{stdint.h} and @code{inttypes.h}
Replacement headers are available from
@item Missing or non-standard library functions
Some functions in the C library are missing or incomplete. The
gcc-apelibs-1207}} package from
@uref{, ports2plan9}
includes an updated C library, but installing the full package gives
unusable executables. Instead, keep the files from @code{gccbin.tgz}
under @code{/386/lib/gnu}. From the @code{libc.a} archive in the
@code{gcc-apelibs-1207} package, extract the following object files and
turn them into a library:
@item @code{strerror.o}
@item @code{strtoll.o}
@item @code{snprintf.o}
@item @code{vsnprintf.o}
@item @code{vfprintf.o}
@item @code{_IO_getc.o}
@item @code{_IO_putc.o}
@end itemize
Use the @code{--extra-libs} option of @code{configure} to inform the
build system of this library.
@item FPU exceptions enabled by default
Unlike most other systems, Plan 9 enables FPU exceptions by default.
These must be disabled before calling any Libav functions. While the
included tools will do this automatically, other users of the
libraries must do it themselves.
@end itemize
......@@ -58,7 +58,7 @@ static inline int is_dos_path(const char *path)
return 0;
#if defined(__OS2__)
#if defined(__OS2__) || defined(__Plan9__)
#define SHUT_RD 0
#define SHUT_WR 1
#define SHUT_RDWR 2
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