Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 112 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/unix/Makefile b/REORG.TODO/sysdeps/unix/Makefile
new file mode 100644
index 0000000000..750e32c4ed
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/Makefile
@@ -0,0 +1,112 @@
+# Copyright (C) 1991-2017 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
+# 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.
+
+# The GNU C Library 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 the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+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 $(common-objpfx)sysd-syscalls
+
+ifeq (misc,$(subdir))
+sysdep_routines += $(unix-extra-syscalls)
+
+ifdef unix-stub-syscalls
+# The system call entry points in this list are supposed to be additional
+# functions not overriding any other sysdeps/.../call.c implementation, but
+# their system call numbers are unavailable in the kernel headers we're
+# using.  Instead of a system call stub, these get a function that fails
+# with ENOSYS.  We just generate a single module defining one function and
+# making all these entry point names aliases for it.
+sysdep_routines += stub-syscalls
+$(objpfx)stub-syscalls.c: $(common-objpfx)sysd-syscalls \
+			  $(..)sysdeps/unix/Makefile
+	$(make-target-directory)
+	(for call in $(unix-stub-syscalls); do \
+	   call=$${call%%@*}; \
+	   echo "#define $$call RENAMED_$$call"; \
+	 done; \
+	 echo '#include <errno.h>'; \
+	 echo '#include <shlib-compat.h>'; \
+	 for call in $(unix-stub-syscalls); do \
+	   call=$${call%%@*}; \
+	   echo "#undef $$call"; \
+	 done; \
+	 echo 'long int _no_syscall (void)'; \
+	 echo '{ __set_errno (ENOSYS); return -1L; }'; \
+	 for call in $(unix-stub-syscalls); do \
+	   case $$call in \
+	   *@@*) \
+	     ver=$${call##*@}; call=$${call%%@*}; \
+	     ver=`echo "$$ver" | sed 's/\./_/g'`; \
+	     echo "strong_alias (_no_syscall, __$${call}_$${ver})"; \
+	     echo "versioned_symbol (libc, __$${call}_$${ver}, $$call, $$ver);"\
+	     ;; \
+	   *@*) \
+	     ver=$${call##*@}; call=$${call%%@*}; \
+	     ver=`echo "$$ver" | sed 's/\./_/g'`; \
+	     case $$ver in \
+	     *:*) \
+	       compat_ver=$${ver#*:}; \
+	       ver=$${ver%%:*}; \
+	       compat_cond="SHLIB_COMPAT (libc, $$ver, $$compat_ver)"; \
+	       ;; \
+	     *) \
+	       compat_cond=""; \
+	       ;; \
+	     esac; \
+	     if [ -n "$$compat_cond" ]; then echo "#if $$compat_cond"; fi; \
+	     echo "strong_alias (_no_syscall, __$${call}_$${ver})"; \
+	     echo "compat_symbol (libc, __$${call}_$${ver}, $$call, $$ver);"; \
+	     if [ -n "$$compat_cond" ]; then echo "#endif"; fi; \
+	     ;; \
+	   *) echo "weak_alias (_no_syscall, $$call)"; \
+	      echo "stub_warning ($$call)"; \
+	      echo "weak_alias (_no_syscall, __GI_$$call)" ;; \
+	   esac; \
+	 done) > $@T
+	mv -f $@T $@
+generated += stub-syscalls.c
+endif
+endif
+
+# This is the end of the pipeline for compiling the syscall stubs.
+# The stdin is assembler with cpp using sysdep.h macros.
+compile-syscall = $(COMPILE.S) -o $@ -x assembler-with-cpp - \
+			       $(compile-mkdep-flags)
+
+ifndef avoid-generated
+$(common-objpfx)sysd-syscalls: $(..)sysdeps/unix/make-syscalls.sh \
+			       $(wildcard $(+sysdep_dirs:%=%/syscalls.list)) \
+			       $(common-objpfx)libc-modules.stmp
+	for dir in $(+sysdep_dirs); do \
+	  test -f $$dir/syscalls.list && \
+	  { sysdirs='$(sysdirs)' \
+	    asm_CPP='$(COMPILE.S) -E -x assembler-with-cpp' \
+	    $(SHELL) $(dir $<)$(notdir $<) $$dir || exit 1; }; \
+	  test $$dir = $(..)sysdeps/unix && break; \
+	done > $@T
+	mv -f $@T $@
+endif
+
+$(common-objpfx)s-%.d: $(..)sysdeps/unix/s-%.S \
+		       $(wildcard $(+sysdep_dirs:%=%/syscalls.list))
+	$(+make-deps)
+
+postclean-generated += sysd-syscalls
+
+endif