gcc-fpic-shared.patch

diff --git a/gcc/config.gcc b/gcc/config.gcc
index c3aecbfe764..d0d2be19d8b 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1509,7 +1509,7 @@ x86_64-*-elf*)
 	tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h newlib-stdint.h i386/i386elf.h i386/x86-64.h"
 	;;
 x86_64-*-rtems*)
-	tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h newlib-stdint.h i386/i386elf.h i386/x86-64.h i386/rtemself.h rtems.h"
+	tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h newlib-stdint.h i386/i386elf.h i386/x86-64.h i386/rtemself64.h rtems.h"
 	;;
 i[34567]86-*-rdos*)
     tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h newlib-stdint.h i386/i386elf.h i386/rdos.h"
diff --git a/gcc/config/i386/rtemself64.h b/gcc/config/i386/rtemself64.h
new file mode 100644
index 00000000000..74d87ccb2cb
--- /dev/null
+++ b/gcc/config/i386/rtemself64.h
@@ -0,0 +1,53 @@
+/* Definitions for rtems targeting an x86_64 using ELF.
+   Copyright (C) 1996-2018 Free Software Foundation, Inc.
+   Contributed by Joel Sherrill (joel@OARcorp.com).
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3, or (at your
+   option) any later version.
+
+   GCC 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 General Public
+   License for more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Specify predefined symbols in preprocessor.  */
+
+#define TARGET_OS_CPP_BUILTINS()		\
+  do						\
+    {						\
+	builtin_define ("__rtems__");		\
+	builtin_define ("__USE_INIT_FINI__");	\
+	builtin_assert ("system=rtems");	\
+    }						\
+  while (0)
+
+#undef STARTFILE_SPEC
+#define STARTFILE_SPEC "\
+%{!nostdlib: %{!qrtems: crt0.o%s} crti.o%s \
+  %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}}"
+
+#undef ENDFILE_SPEC
+#define ENDFILE_SPEC \
+  "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
+
+/* Use -fPIC by default unless specified otherwise */
+#undef CC1_SPEC
+#define CC1_SPEC \
+  "%{!fno-pic:%{!fno-PIC:%{!fpic:%{!fPIC: -fPIC}}}}"
+
+#undef LINK_SPEC
+#define LINK_SPEC \
+  "%{shared:-shared}"
diff --git a/gcc/config/rtems.h b/gcc/config/rtems.h
index dcea95cddad..9a0619cb383 100644
--- a/gcc/config/rtems.h
+++ b/gcc/config/rtems.h
@@ -30,11 +30,15 @@
  * Dummy start/end specification to let linker work as
  * needed by autoconf scripts using this compiler.
  */
+#if 0
 #undef STARTFILE_SPEC
-#define STARTFILE_SPEC "crt0.o%s"
+#define STARTFILE_SPEC "%{!qrtems: crt0.o%s}"
+#endif
 
+#if 0
 #undef ENDFILE_SPEC
 #define ENDFILE_SPEC   ""
+#endif
 
 /*
  * Some targets do not set up LIB_SPECS, override it, here.
diff --git a/libgcc/config.host b/libgcc/config.host
index 18cabaf24f6..3be204a0da0 100644
--- a/libgcc/config.host
+++ b/libgcc/config.host
@@ -613,7 +613,7 @@ x86_64-*-elf* | x86_64-*-rtems*)
 	tmake_file="$tmake_file i386/t-crtstuff t-crtstuff-pic t-libgcc-pic"
 	case ${host} in
 	  x86_64-*-rtems*)
-	    extra_parts="$extra_parts crti.o crtn.o"
+	    extra_parts="$extra_parts crti.o crtn.o crtbeginS.o crtendS.o"
 	    ;;
 	esac
 	;;

Built on top of Joel's WIP patch here:
https://lists.rtems.org/pipermail/devel/2018-May/021587.html

I just wanted to add sane defaults for when the -fPIC -shared options are used during compilation.