Thu Jan 18 00:32:43 1996 Roland McGrath <roland@churchy.gnu.ai.mit.edu> cvs/libc-960118

	* Makerules (COMPILE.s): New variable.

	* sysdeps/unix/Makefile (sysd-syscalls): New target; generate with
	make-syscalls.sh and include it.
	[$(subdir)=misc] (sysdep_routines): Append extra syscalls from
	sysd-syscalls.
	* sysdeps/unix/make-syscalls.sh: New file.

	* Makerules (COMPILE.S): New variable.

2 files changed, 106 insertions, 3 deletions

diff --git a/sysdeps/unix/Makefile b/sysdeps/unix/Makefile
index 9ffb344683..a09ea4f76f 100644
--- a/sysdeps/unix/Makefile
+++ b/sysdeps/unix/Makefile
@@ -1,4 +1,4 @@
-# Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+# Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
 # This file is part of the GNU C Library.
 
 # The GNU C Library is free software; you can redistribute it and/or
@@ -85,7 +85,7 @@ ifndef no_deps
 include $(common-objpfx)param.h.dep
 endif
 
-# Don't preempt our own headers. 
+# Don't preempt our own headers.
 sys/param.h-includes := \
   $(filter-out $(patsubst $(..)%,%,\
 			  $(wildcard $(addprefix $(..),\
@@ -130,7 +130,7 @@ ifeq (,$(filter-out $(sysdep_dir)/stub/ $(common-objpfx),\
 
 # These need to exist before any compiling is done,
 # so cpp doesn't instead find the stub versions.
-before-compile := $(before-compile) $(common-objpfx)errnos.h 
+before-compile := $(before-compile) $(common-objpfx)errnos.h
 
 $(common-objpfx)errnos.h: $(common-objpfx)make-errnos
 	$(dir $<)$(notdir $<) > $@-tmp
@@ -266,3 +266,30 @@ common-generated := $(common-generated) syscall.h
 endif
 
 endif
+
+ifndef inhibit-unix-syscalls
+
+# Sysdep dirs unix/... can contain a file syscalls.list,
+# which specifies objects to be compiled as simple Unix system calls.
+
+-include $(objpfx)sysd-syscalls
+omit-deps += $(unix-syscalls)
+
+ifeq (misc,$(subdir))
+sysdep_routines += $(unix-extra-syscalls)
+endif
+
+export sysdirs
+export asm_CPP := $(COMPILE.S) -E -x assembler-with-cpp
+
+$(objpfx)sysd-syscalls: $(..)sysdeps/unix/make-syscalls.sh \
+			$(wildcard $(+sysdep_dirs:%=%/syscalls.list))
+	for dir in $$sysdirs; do \
+	  test -f $(..)sysdeps/$$dir/syscalls.list && \
+	  { $(SHELL) $(dir $<)$(notdir $<) \
+		     $(..)sysdeps $$dir $(object-suffixes) || exit 1; }; \
+	  test $$dir = unix && break; \
+	done > $@T
+	mv -f $@T $@
+
+endif
diff --git a/sysdeps/unix/make-syscalls.sh b/sysdeps/unix/make-syscalls.sh
new file mode 100644
index 0000000000..ff4b082b11
--- /dev/null
+++ b/sysdeps/unix/make-syscalls.sh
@@ -0,0 +1,76 @@
+#! /bin/sh
+
+# Usage: make-syscalls.sh ../sysdeps unix/common
+# Expects $sysdirs in environment.
+
+sysbase=$1; shift
+thisdir=$1; shift
+
+# Get the list of system calls for this directory.
+calls=`sed 's/#.*$//
+/^[ 	]*$/d' $sysbase/$thisdir/syscalls.list`
+
+# Check each sysdep dir with higher priority than this one,
+# and remove from $calls all the functions found in other dirs.
+for dir in $sysdirs; do
+
+  # Punt when we reach the directory defining these syscalls.
+  test $dir = $thisdir && break
+
+  # Remove each syscall that is implemented by a file in $dir.
+  # If a syscall specified a "caller", then only compile that syscall
+  # if the caller function is also implemented in this directory.
+  calls=`echo "$calls" | while read file caller rest; do
+	   test -f $sysbase/$dir/$file.c && continue
+	   test -f $sysbase/$dir/$file.S && continue
+	   test -f $sysbase/$dir/$file.s && continue
+	   if test x$caller != x-; then
+	     test -f $sysbase/$dir/$caller.c && continue
+	     test -f $sysbase/$dir/$caller.S && continue
+	     test -f $sysbase/$dir/$caller.s && continue
+	   fi
+	   echo $file $caller $rest
+         done`
+
+done
+
+# Any calls left?
+test -n "$calls" || exit 0
+
+files=
+
+# Emit rules to compile the syscalls remaining in $calls.
+echo "$calls" | while read file caller syscall nargs strong weak; do
+
+  # Figure out if $syscall is defined with a number in syscall.h.
+  $asm_CPP - << EOF | grep "^@@@ .*$syscall" >/dev/null && continue
+#include <sysdep.h>
+@@@ SYS_ify ($syscall)
+EOF
+
+  # Make sure only the first syscall rule is used, if multiple dirs
+  # define the same syscall.
+  echo "ifeq (,\$(filter $file,\$(unix-syscalls)))"
+
+  # Accumulate the list of syscall files for this directory.
+  echo "unix-syscalls += $file"
+  test x$caller = x- || echo "unix-extra-syscalls += $file"
+
+  # Emit a compilation rule for this syscall.
+  echo "\
+\$(foreach o,\$(object-suffixes),\$(objpfx)$file\$o): \$(objpfx)s-proto.d
+	(echo '#include <sysdep.h>'; \\
+	 echo 'PSEUDO ($strong, $syscall, $nargs)'; \\
+	 echo '	ret'; \\"
+
+  # Append any weak aliases defined for this syscall function.
+  for name in $weak; do
+    echo "	 echo 'weak_alias ($strong, $name)'; \\"
+  done
+
+  # And finally, pipe this all into the compiler.
+  echo '	) | $(COMPILE.S) -x assembler-with-cpp -o $@ -'
+
+  echo endif
+
+done