Remove Plan 9 support

Supporting the system was a nice joke for the 9 release, but it has
run its course. Nowadays Plan 9 receives no testing and has no
practical usefulness.

Makefile

@@ -116,7 +116,7 @@ FF_STATIC_DEP_LIBS := $(STATIC_DEP_LIBS)
 
 all: $(AVPROGS)
 
-$(TOOLS): %$(EXESUF): %.o $(EXEOBJS)
+$(TOOLS): %$(EXESUF): %.o
 	$(LD) $(LDFLAGS) $(LDEXEFLAGS) $(LD_O) $^ $(ELIBS)
 
 tools/cws2fws$(EXESUF): ELIBS = $(ZLIB)
@@ -157,7 +157,7 @@ $(foreach D,$(FFLIBS),$(eval $(call DOSUBDIR,lib$(D))))
 include $(SRC_PATH)/doc/Makefile
 
 define DOPROG
-OBJS-$(1) += $(1).o $(EXEOBJS) $(OBJS-$(1)-yes)
+OBJS-$(1) += $(1).o $(OBJS-$(1)-yes)
 $(1)$(EXESUF): $$(OBJS-$(1))
 $$(OBJS-$(1)): CFLAGS  += $(CFLAGS-$(1))
 $(1)$(EXESUF): LDFLAGS += $(LDFLAGS-$(1))

compat/plan9/head

-#!/bin/sh
-
-n=10
-
-case "$1" in
-    -n)  n=$2;      shift 2 ;;
-    -n*) n=${1#-n}; shift   ;;
-esac
-
-exec sed ${n}q "$@"

compat/plan9/main.c

-/*
- * 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);
-}

compat/plan9/printf

-#!/bin/sh
-exec awk "BEGIN { for (i = 2; i < ARGC; i++) printf \"$1\", ARGV[i] }" "$@"

configure

@@ -1173,7 +1173,7 @@ apply(){
 cp_if_changed(){
     cmp -s "$1" "$2" && { test "$quiet" != "yes" && 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
@@ -2491,7 +2491,6 @@ shlibdir_default="$libdir_default"
 ar_default="ar"
 cc_default="gcc"
 host_cc_default="gcc"
-cp_f="cp -f"
 ln_s="ln -s -f"
 nm_default="nm -g"
 objformat="elf"
@@ -3985,17 +3984,6 @@ 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
-        cp_f='cp'
-        ;;
     none)
         ;;
     *)
@@ -5056,9 +5044,6 @@ case $target_os in
     osf1)
         enabled ccc && add_ldflags '-Wl,-expect_unresolved,*'
     ;;
-    plan9)
-        add_cppflags -Dmain=plan9_main
-    ;;
 esac
 
 enabled asm || { arch=c; disable $ARCH_LIST $ARCH_EXT_LIST; }
@@ -5318,7 +5303,6 @@ ZLIB=$($ldflags_filter -lz)
 LIB_INSTALL_EXTRA_CMD=$LIB_INSTALL_EXTRA_CMD
 EXTRALIBS=$extralibs
 COMPAT_OBJS=$compat_objs
-EXEOBJS=$exeobjs
 INSTALL=install
 LIBTARGET=${LIBTARGET}
 SLIBNAME=${SLIBNAME}

doc/platform.texi

@@ -336,67 +336,4 @@ 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{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.
-
-@itemize
-
-@item GNU awk, grep, make, and sed
-
-Working packages of these tools can be found 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
-@code{http://ports2plan9.googlecode.com/files/}.
-
-@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
-@url{http://code.google.com/p/plan9front/issues/detail?id=152}.
-
-@item Missing or non-standard library functions
-
-Some functions in the C library are missing or incomplete.  The
-@code{@uref{http://ports2plan9.googlecode.com/files/gcc-apelibs-1207.tbz,
-gcc-apelibs-1207}} package from
-@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
-@code{gcc-apelibs-1207} package, extract the following object files and
-turn them into a library:
-
-@itemize
-@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
-
 @bye

libavformat/os_support.h

@@ -59,7 +59,7 @@ static inline int is_dos_path(const char *path)
     return 0;
 }
 
-#if defined(__OS2__) || defined(__Plan9__)
+#if defined(__OS2__)
 #define SHUT_RD 0
 #define SHUT_WR 1
 #define SHUT_RDWR 2

library.mak

@@ -27,7 +27,7 @@ define RULES
 $(TOOLS):     THISLIB = $(FULLNAME:%=$(LD_LIB))
 $(TESTPROGS): THISLIB = $(SUBDIR)$(LIBNAME)
 
-$(TESTPROGS) $(TOOLS): %$(EXESUF): %.o $(EXEOBJS)
+$(TESTPROGS) $(TOOLS): %$(EXESUF): %.o
 	$$(LD) $(LDFLAGS) $(LDEXEFLAGS) $$(LD_O) $$(filter %.o,$$^) $$(THISLIB) $(FFEXTRALIBS) $$(ELIBS)
 
 $(SUBDIR)lib$(NAME).ver: $(SUBDIR)lib$(NAME).v $(OBJS)

tests/checkasm/Makefile

@@ -34,7 +34,7 @@ OBJDIRS += $(CHECKASMDIRS)
 
 CHECKASM := tests/checkasm/checkasm$(EXESUF)
 
-$(CHECKASM): $(EXEOBJS) $(CHECKASMOBJS) $(FF_STATIC_DEP_LIBS)
+$(CHECKASM): $(CHECKASMOBJS) $(FF_STATIC_DEP_LIBS)
 	$(LD) $(LDFLAGS) $(LDEXEFLAGS) $(LD_O) $(CHECKASMOBJS) $(FF_STATIC_DEP_LIBS) $(EXTRALIBS)
 
 checkasm: $(CHECKASM)