libssp-nonshared: Add recipe

libssp-nonshared is a minimal gcc runtime piece which is needed
on non-glibc systems which do implement libssp APIs in libc

Use PIE flags to compile libssp_nonshared.a so it works with
security flags on as well

(From OE-Core rev: ddfab4d021d4daa5aefcd9cdd89d349bbd4b6869)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/musl/libssp-nonshared.bb

@@ -0,0 +1,39 @@
+# Copyright (C) 2018 Khem Raj <raj.khem@gmail.com>
+# Released under the MIT license (see COPYING.MIT for the terms)
+
+SUMMARY = "Minimal libssp_nonshared.a must needed for ssp to work with gcc on musl"
+LICENSE = "GPL-3.0-with-GCC-exception"
+LIC_FILES_CHKSUM = "file://ssp-local.c;beginline=1;endline=32;md5=c06d391208c0cfcbc541a6728ed65cc4"
+SECTION = "libs"
+
+SRC_URI = "file://ssp-local.c"
+
+PATH_prepend = "${STAGING_BINDIR_TOOLCHAIN}.${STAGINGCC}:"
+
+INHIBIT_DEFAULT_DEPS = "1"
+
+STAGINGCC = "gcc-cross-initial-${TARGET_ARCH}"
+STAGINGCC_class-nativesdk = "gcc-crosssdk-initial-${SDK_SYS}"
+
+DEPENDS = "virtual/${TARGET_PREFIX}binutils \
+           virtual/${TARGET_PREFIX}gcc-initial \
+"
+
+do_configure[noexec] = "1"
+
+S = "${WORKDIR}"
+
+do_compile() {
+	${CC} ${CPPFLAGS} ${CFLAGS} -fPIE -c ssp-local.c -o ssp-local.o
+	${AR} r libssp_nonshared.a ssp-local.o
+}
+do_install() {
+	install -Dm 0644 ${B}/libssp_nonshared.a ${D}${base_libdir}/libssp_nonshared.a
+}
+#
+# We will skip parsing for non-musl systems
+#
+COMPATIBLE_HOST = ".*-musl.*"
+RDEPENDS_${PN}-staticdev = ""
+RDEPENDS_${PN}-dev = ""
+RRECOMMENDS_${PN}-dbg = "${PN}-staticdev (= ${EXTENDPKGV})"

meta/recipes-core/musl/libssp-nonshared/ssp-local.c

@@ -0,0 +1,45 @@
+/* Stack protector support.
+   Copyright (C) 2005-2018 Free Software Foundation, Inc.
+
+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.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file.  (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+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/>.  */
+
+extern void __stack_chk_fail (void);
+
+/* Some targets can avoid loading a GP for calls to hidden functions.
+   Using this entry point may avoid the load of a GP entirely for the
+   function, making the overall code smaller.  */
+
+void
+__attribute__((visibility ("hidden")))
+__stack_chk_fail_local (void)
+{
+  __stack_chk_fail ();
+}