xentools411: backport upstream commit to work around compilation issue

with GCC>=8 and _FORTIFY_SOURCE.

GCC refuses to inline functions with different target attributes.
SSP headers (upstream GCC and netbsd's) use always_inline.

If we reduce the target options ("no SSE") then it can't inline the
default options (yes SSE) ssp/string.h functions.

PR toolchain/54672

sysutils/xentools411/distinfo

@@ -1,4 +1,4 @@
-$NetBSD: distinfo,v 1.6 2019/08/30 13:16:27 bouyer Exp $
+$NetBSD: distinfo,v 1.7 2019/11/03 10:07:16 maya Exp $
 
 SHA1 (xen411/ipxe-git-356f6c1b64d7a97746d1816cef8ca22bdd8d0b5d.tar.gz) = 272b8c904dc0127690eca2c5c20c67479e40da34
 RMD160 (xen411/ipxe-git-356f6c1b64d7a97746d1816cef8ca22bdd8d0b5d.tar.gz) = cfcb4a314c15da19b36132b27126f3bd9699d0e5
@@ -12,6 +12,7 @@ SHA1 (patch-.._ipxe_src_core_settings.c) = 1eab2fbd8b22dde2b8aa830ae7701603486f7
 SHA1 (patch-.._ipxe_src_net_fcels.c) = eda41b25c3d5f5bef33caa9a6af28c40cb91e66b
 SHA1 (patch-Config.mk) = c41005a60de2f94a72b0206030eb021c137653d3
 SHA1 (patch-Makefile) = 2f3a5eafc5039b149c98dd5e59c39a3197fd9264
+SHA1 (patch-always_inline) = 23201b2b63072e040630525416a0b61280492f93
 SHA1 (patch-docs_man_xl-disk-configuration.pod.5) = 03ff4c22dde1e1b60ab8750c8971ea057e479151
 SHA1 (patch-docs_man_xl.cfg.pod.5.in) = 951915037a9975b76cc5c41a0e1abe0a202a3696
 SHA1 (patch-docs_man_xl.conf.pod.5) = d77e3313750db315d540d7713c95cd54d6f02938

sysutils/xentools411/patches/patch-always_inline

@@ -0,0 +1,139 @@
+$NetBSD: patch-always_inline,v 1.1 2019/11/03 10:07:17 maya Exp $
+
+Fix compilation issue with GCC>=8 and _FORTIFY_SOURCE.
+
+
+From e8dfbc2962365ffa3d7ddcacaa5baaf4ed24b2af Mon Sep 17 00:00:00 2001
+From: Christopher Clark <christopher.clark6@baesystems.com>
+Date: Tue, 25 Sep 2018 16:30:32 +0200
+Subject: [PATCH 1/1] fuzz, test x86_emulator: disable sse before including
+ always_inline fns
+
+Workaround for compiler rejection of SSE-using always_inlines defined before
+SSE is disabled.
+
+Compiling with _FORTIFY_SOURCE or higher levels of optimization enabled
+will always_inline several library fns (memset, memcpy, ...)
+(with gcc 8.2.0 and glibc 2.28).
+
+In fuzz and x86_emulator test, the compiler is instructed not
+to generate SSE instructions via: #pragma GCC target("no-sse")
+because those registers are needed for use by the workload.
+
+The combination above causes compilation failure as the inline functions
+use those instructions. This is resolved by reordering the inclusion of
+<stdio.h> and <string.h> to after the pragma disabling SSE generation.
+
+It would be preferable to locate the no-sse pragma within x86-emulate.h at the
+top of the file, prior to including any other headers; unfortunately doing so
+before <stdlib.h> causes compilation failure due to declaration of 'atof' with:
+  "SSE register return with SSE disabled".
+Fortunately there is no (known) current dependency on any always_inline
+SSE-inclined function declared in <stdlib.h> or any of its dependencies, so the
+pragma is therefore issued immediately after inclusion of <stdlib.h> with a
+comment introduced to explain its location there.
+
+Add compile-time checks for unwanted prior inclusion of <string.h> and
+<stdio.h>, which are the two headers that provide the library functions that
+are handled with wrappers and listed within "x86-emulate.h" as ones "we think
+might access any of the FPU state".
+* Use standard-defined "EOF" macro to detect prior <stdio.h> inclusion.
+* Use "_STRING_H" (non-standardized guard macro) as best-effort
+  for detection of prior <string.h> inclusion. This is non-universally
+  viable but will provide error output on common GLIBC systems, so
+  provides some defensive coverage.
+
+Adds conditional #include <stdio.h> to x86-emulate.h because fwrite, printf,
+etc. are referenced when WRAP has been defined.
+
+Signed-off-by: Christopher Clark <christopher.clark6@baesystems.com>
+Reviewed-by: Jan Beulich <jbeulich@suse.com>
+---
+ tools/fuzz/x86_instruction_emulator/fuzz-emul.c | 10 +++++++--
+ tools/tests/x86_emulator/wrappers.c             |  1 -
+ tools/tests/x86_emulator/x86-emulate.h          | 28 +++++++++++++++++++++++--
+ 3 files changed, 34 insertions(+), 5 deletions(-)
+
+diff --git a/tools/fuzz/x86_instruction_emulator/fuzz-emul.c b/tools/fuzz/x86_instruction_emulator/fuzz-emul.c
+index 03a2473cdb..0ffd0fbfe1 100644
+--- tools/fuzz/x86_instruction_emulator/fuzz-emul.c.orig
++++ tools/fuzz/x86_instruction_emulator/fuzz-emul.c
+@@ -6,9 +6,7 @@
+ #include <stdbool.h>
+ #include <stddef.h>
+ #include <stdint.h>
+-#include <stdio.h>
+ #include <stdlib.h>
+-#include <string.h>
+ #include <sys/types.h>
+ #include <sys/stat.h>
+ #include <sys/mman.h>
+@@ -16,6 +14,14 @@
+ #include <xen/xen.h>
+ 
+ #include "x86-emulate.h"
++/*
++ * include "x86-emulate.h" prior to <stdio.h> and <string.h>:
++ * x86-emulate.h disables use of SSE registers, while <stdio.h> and <string.h>
++ * declare functions that may be always_inline and use those registers
++ * unless they have been disabled earlier, which can fail to compile.
++ */
++#include <stdio.h>
++#include <string.h>
+ #include "fuzz-emul.h"
+ 
+ #define MSR_INDEX_MAX 16
+diff --git a/tools/tests/x86_emulator/wrappers.c b/tools/tests/x86_emulator/wrappers.c
+index d02013c4b1..eba7cc93c5 100644
+--- tools/tests/x86_emulator/wrappers.c.orig
++++ tools/tests/x86_emulator/wrappers.c
+@@ -1,5 +1,4 @@
+ #include <stdarg.h>
+-#include <stdio.h>
+ 
+ #define WRAP(x) typeof(x) emul_##x
+ #include "x86-emulate.h"
+diff --git a/tools/tests/x86_emulator/x86-emulate.h b/tools/tests/x86_emulator/x86-emulate.h
+index b249e4673c..08dead32fd 100644
+--- tools/tests/x86_emulator/x86-emulate.h.orig
++++ tools/tests/x86_emulator/x86-emulate.h
+@@ -3,10 +3,34 @@
+ #include <stddef.h>
+ #include <stdint.h>
+ #include <stdlib.h>
++/*
++ * Use of sse registers must be disabled prior to the definition of
++ * always_inline functions that would use them (memcpy, memset, etc),
++ * so do this as early as possible, aiming to be before any always_inline
++ * functions that are used are declared.
++ * Unfortunately, this cannot be done prior to inclusion of <stdlib.h>
++ * due to functions such as 'atof' that have SSE register return declared,
++ * so do so here, immediately after that.
++ */
++#if __GNUC__ >= 6
++# pragma GCC target("no-sse")
++#endif
++ /*
++ * Attempt detection of unwanted prior inclusion of some headers known to use
++ * always_inline with SSE registers in some library / compiler / optimization
++ * combinations.
++ */
++#ifdef _STRING_H
++# error "Must not include <string.h> before x86-emulate.h"
++#endif
+ #include <string.h>
+ 
+-#if __GNUC__ >= 6
+-#pragma GCC target("no-sse")
++/* EOF is a standard macro defined in <stdio.h> so use it for detection */
++#ifdef EOF
++# error "Must not include <stdio.h> before x86-emulate.h"
++#endif
++#ifdef WRAP
++# include <stdio.h>
+ #endif
+ 
+ #include <xen/xen.h>
+-- 
+2.11.0
+