[FFmpeg-cvslog] build: Plan 9 support
Mans Rullgard
git at videolan.org
Wed Oct 24 13:46:55 CEST 2012
ffmpeg | branch: master | Mans Rullgard <mans at mansr.com> | Mon Oct 15 02:38:17 2012 +0100| [4ebc6a74108f6c0448249b398ef33b25f3b16c0c] | committer: 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
documentation.
Signed-off-by: Mans Rullgard <mans at mansr.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4ebc6a74108f6c0448249b398ef33b25f3b16c0c
---
compat/plan9/head | 10 ++++++++
compat/plan9/main.c | 34 +++++++++++++++++++++++++
compat/plan9/printf | 2 ++
configure | 22 +++++++++++++++-
doc/platform.texi | 63 ++++++++++++++++++++++++++++++++++++++++++++++
libavformat/os_support.h | 2 +-
6 files changed, 131 insertions(+), 2 deletions(-)
diff --git a/compat/plan9/head b/compat/plan9/head
new file mode 100755
index 0000000..2840b2d
--- /dev/null
+++ b/compat/plan9/head
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+n=10
+
+case "$1" in
+ -n) n=$2; shift 2 ;;
+ -n*) n=${1#-n}; shift ;;
+esac
+
+exec sed ${n}q "$@"
diff --git a/compat/plan9/main.c b/compat/plan9/main.c
new file mode 100644
index 0000000..97d7067
--- /dev/null
+++ b/compat/plan9/main.c
@@ -0,0 +1,34 @@
+/*
+ * 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
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * 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));
+#endif
+
+ return plan9_main(argc, argv);
+}
diff --git a/compat/plan9/printf b/compat/plan9/printf
new file mode 100755
index 0000000..1a70a9e
--- /dev/null
+++ b/compat/plan9/printf
@@ -0,0 +1,2 @@
+#!/bin/sh
+exec awk "BEGIN { for (i = 2; i < ARGC; i++) printf \"$1\", ARGV[i] }" "$@"
diff --git a/configure b/configure
index f597caf..37cdf1e 100755
--- a/configure
+++ b/configure
@@ -956,7 +956,7 @@ apply(){
cp_if_changed(){
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"
ar_default="ar"
cc_default="gcc"
host_cc_default="gcc"
+cp_f="cp -f"
ln_s="ln -sf"
nm_default="nm -g"
objformat="elf"
@@ -2879,6 +2880,19 @@ case $target_os in
;;
minix)
;;
+ plan9)
+ add_cppflags -D_C99_SNPRINTF_EXTENSION \
+ -D_REENTRANT_SOURCE \
+ -D_RESEARCH_SOURCE \
+ -DFD_SETSIZE=96 \
+ -DHAVE_SOCK_OPTS
+ add_compat strtod.o strtod=avpriv_strtod
+ network_extralibs='-lbsd'
+ exeobjs=compat/plan9/main.o
+ disable avserver
+ ln_s='ln -s -f'
+ cp_f='cp'
+ ;;
none)
;;
*)
@@ -3531,6 +3545,12 @@ elif enabled msvc; then
enabled x86_32 && disable aligned_stack
fi
+case $target_os in
+ plan9)
+ add_cppflags -Dmain=plan9_main
+ ;;
+esac
+
enabled_any $THREADS_LIST && enable threads
enabled asm || { arch=c; disable $ARCH_LIST $ARCH_EXT_LIST; }
diff --git a/doc/platform.texi b/doc/platform.texi
index d637f00..6bb7136 100644
--- a/doc/platform.texi
+++ b/doc/platform.texi
@@ -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
+ at chapter Plan 9
+
+The native @uref{http://plan9.bell-labs.com/plan9/, 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.
+
+ at itemize
+
+ at item GNU awk, grep, make, and sed
+
+Working packages of these tools can be found at
+ at uref{http://code.google.com/p/ports2plan9/downloads/list, ports2plan9}.
+They can be installed with @uref{http://9front.org/, 9front's} @code{pkg}
+utility by setting @code{pkgpath} to
+ at code{http://ports2plan9.googlecode.com/files/}.
+
+ at item Missing/broken @code{head} and @code{printf} commands
+
+Replacements adequate for building Libav can be found in the
+ at 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.
+
+ at item Missing C99 @code{stdint.h} and @code{inttypes.h}
+
+Replacement headers are available from
+ at url{http://code.google.com/p/plan9front/issues/detail?id=152}.
+
+ at item Missing or non-standard library functions
+
+Some functions in the C library are missing or incomplete. The
+ at code{@uref{http://ports2plan9.googlecode.com/files/gcc-apelibs-1207.tbz,
+gcc-apelibs-1207}} package from
+ at uref{http://code.google.com/p/ports2plan9/downloads/list, 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
+ at code{gcc-apelibs-1207} package, extract the following object files and
+turn them into a library:
+
+ at itemize
+ at item @code{strerror.o}
+ at item @code{strtoll.o}
+ at item @code{snprintf.o}
+ at item @code{vsnprintf.o}
+ at item @code{vfprintf.o}
+ at item @code{_IO_getc.o}
+ at item @code{_IO_putc.o}
+ at end itemize
+
+Use the @code{--extra-libs} option of @code{configure} to inform the
+build system of this library.
+
+ at 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.
+
+ at end itemize
+
@bye
diff --git a/libavformat/os_support.h b/libavformat/os_support.h
index 1bf79eb..c5d3ab4 100644
--- a/libavformat/os_support.h
+++ b/libavformat/os_support.h
@@ -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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