toolchain/gcc: add 6.1.0

-fno-plt and musl-libc patches already get upstream, then dropped
in GCC 6. Other patches are almost identical compared to GCC 5.4.

Compile and run tested on ar71xx/Qihoo C301 and
mvebu/Linksys WRT1900ac v1

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name> [cleanups/fixes]

toolchain/gcc/Config.in

@@ -16,6 +16,10 @@ choice
 		bool "gcc 5.x"
 		depends on !arc
 
+	config GCC_USE_VERSION_6
+		bool "gcc 6.x"
+		depends on !arc
+
 endchoice
 
 config GCC_USE_GRAPHITE

toolchain/gcc/Config.version

@@ -5,6 +5,7 @@ config GCC_VERSION_4_8_ARC
 config GCC_VERSION
 	string
 	default "arc-2016.03"   if GCC_VERSION_4_8_ARC
+	default "6.1.0"         if GCC_USE_VERSION_6
 	default "5.4.0"
 
 config GCC_VERSION_4_8

toolchain/gcc/common.mk

@@ -32,6 +32,10 @@ ifeq ($(PKG_VERSION),5.4.0)
   PKG_MD5SUM:=4c626ac2a83ef30dfb9260e6f59c2b30
 endif
 
+ifeq ($(PKG_VERSION),6.1.0)
+  PKG_MD5SUM:=8fb6cb98b8459f5863328380fbf06bd1
+endif
+
 ifneq ($(CONFIG_GCC_VERSION_4_8_ARC),)
     PKG_VERSION:=4.8.5
     PKG_SOURCE_URL:=https://github.com/foss-for-synopsys-dwc-arc-processors/gcc/archive/arc-2016.03

toolchain/gcc/patches/6.1.0/001-revert_register_mode_search.patch

+Revert of:
+
+commit 275035b56823b26d5fb7e90fad945b998648edf2
+Author: bergner <bergner@138bc75d-0d04-0410-961f-82ee72b054a4>
+Date:   Thu Sep 5 14:09:07 2013 +0000
+
+        PR target/58139
+        * reginfo.c (choose_hard_reg_mode): Scan through all mode classes
+        looking for widest mode.
+
+
+    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@202286 138bc75d-0d04-0410-961f-82ee72b054a4
+
+
+--- a/gcc/reginfo.c
++++ b/gcc/reginfo.c
+@@ -625,35 +625,40 @@ choose_hard_reg_mode (unsigned int regno
+        mode = GET_MODE_WIDER_MODE (mode))
+     if ((unsigned) hard_regno_nregs[regno][mode] == nregs
+ 	&& HARD_REGNO_MODE_OK (regno, mode)
+-	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
+-	&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
++	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
+       found_mode = mode;
+ 
++  if (found_mode != VOIDmode)
++    return found_mode;
++
+   for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
+        mode != VOIDmode;
+        mode = GET_MODE_WIDER_MODE (mode))
+     if ((unsigned) hard_regno_nregs[regno][mode] == nregs
+ 	&& HARD_REGNO_MODE_OK (regno, mode)
+-	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
+-	&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
++	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
+       found_mode = mode;
+ 
++  if (found_mode != VOIDmode)
++    return found_mode;
++
+   for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
+        mode != VOIDmode;
+        mode = GET_MODE_WIDER_MODE (mode))
+     if ((unsigned) hard_regno_nregs[regno][mode] == nregs
+ 	&& HARD_REGNO_MODE_OK (regno, mode)
+-	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
+-	&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
++	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
+       found_mode = mode;
+ 
++  if (found_mode != VOIDmode)
++    return found_mode;
++
+   for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
+        mode != VOIDmode;
+        mode = GET_MODE_WIDER_MODE (mode))
+     if ((unsigned) hard_regno_nregs[regno][mode] == nregs
+ 	&& HARD_REGNO_MODE_OK (regno, mode)
+-	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode))
+-	&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (found_mode))
++	&& (! call_saved || ! HARD_REGNO_CALL_PART_CLOBBERED (regno, mode)))
+       found_mode = mode;
+ 
+   if (found_mode != VOIDmode)

toolchain/gcc/patches/6.1.0/002-case_insensitive.patch

+--- a/include/filenames.h
++++ b/include/filenames.h
+@@ -43,11 +43,6 @@ extern "C" {
+ #  define IS_DIR_SEPARATOR(c) IS_DOS_DIR_SEPARATOR (c)
+ #  define IS_ABSOLUTE_PATH(f) IS_DOS_ABSOLUTE_PATH (f)
+ #else /* not DOSish */
+-#  if defined(__APPLE__)
+-#    ifndef HAVE_CASE_INSENSITIVE_FILE_SYSTEM
+-#      define HAVE_CASE_INSENSITIVE_FILE_SYSTEM 1
+-#    endif
+-#  endif /* __APPLE__ */
+ #  define HAS_DRIVE_SPEC(f) (0)
+ #  define IS_DIR_SEPARATOR(c) IS_UNIX_DIR_SEPARATOR (c)
+ #  define IS_ABSOLUTE_PATH(f) IS_UNIX_ABSOLUTE_PATH (f)

toolchain/gcc/patches/6.1.0/010-documentation.patch

+--- a/gcc/Makefile.in
++++ b/gcc/Makefile.in
+@@ -3021,18 +3021,10 @@ doc/gcc.info: $(TEXI_GCC_FILES)
+ doc/gccint.info: $(TEXI_GCCINT_FILES)
+ doc/cppinternals.info: $(TEXI_CPPINT_FILES)
+ 
+-doc/%.info: %.texi
+-	if [ x$(BUILD_INFO) = xinfo ]; then \
+-		$(MAKEINFO) $(MAKEINFOFLAGS) -I . -I $(gcc_docdir) \
+-			-I $(gcc_docdir)/include -o $@ $<; \
+-	fi
++doc/%.info:
+ 
+ # Duplicate entry to handle renaming of gccinstall.info
+-doc/gccinstall.info: $(TEXI_GCCINSTALL_FILES)
+-	if [ x$(BUILD_INFO) = xinfo ]; then \
+-		$(MAKEINFO) $(MAKEINFOFLAGS) -I $(gcc_docdir) \
+-			-I $(gcc_docdir)/include -o $@ $<; \
+-	fi
++doc/gccinstall.info:
+ 
+ doc/cpp.dvi: $(TEXI_CPP_FILES)
+ doc/gcc.dvi: $(TEXI_GCC_FILES)

toolchain/gcc/patches/6.1.0/100-uclibc-conf.patch

+--- a/contrib/regression/objs-gcc.sh
++++ b/contrib/regression/objs-gcc.sh
+@@ -106,6 +106,10 @@ if [ $H_REAL_TARGET = $H_REAL_HOST -a $H
+  then
+   make all-gdb all-dejagnu all-ld || exit 1
+   make install-gdb install-dejagnu install-ld || exit 1
++elif [ $H_REAL_TARGET = $H_REAL_HOST -a $H_REAL_TARGET = i686-pc-linux-uclibc ]
++ then
++  make all-gdb all-dejagnu all-ld || exit 1
++  make install-gdb install-dejagnu install-ld || exit 1
+ elif [ $H_REAL_TARGET = $H_REAL_HOST ] ; then
+   make bootstrap || exit 1
+   make install || exit 1
+--- a/libjava/classpath/ltconfig
++++ b/libjava/classpath/ltconfig
+@@ -603,7 +603,7 @@ host_os=`echo $host | sed 's/^\([^-]*\)-
+ 
+ # Transform linux* to *-*-linux-gnu*, to support old configure scripts.
+ case $host_os in
+-linux-gnu*) ;;
++linux-gnu*|linux-uclibc*) ;;
+ linux*) host=`echo $host | sed 's/^\(.*-.*-linux\)\(.*\)$/\1-gnu\2/'`
+ esac
+ 
+@@ -1247,7 +1247,7 @@ linux-gnuoldld* | linux-gnuaout* | linux
+   ;;
+ 
+ # This must be Linux ELF.
+-linux-gnu*)
++linux*)
+   version_type=linux
+   need_lib_prefix=no
+   need_version=no

toolchain/gcc/patches/6.1.0/230-musl_libssp.patch

+--- a/gcc/gcc.c
++++ b/gcc/gcc.c
+@@ -858,7 +858,9 @@ proper position among the other output f
+ #endif
+ 
+ #ifndef LINK_SSP_SPEC
+-#ifdef TARGET_LIBC_PROVIDES_SSP
++#if DEFAULT_LIBC == LIBC_MUSL
++#define LINK_SSP_SPEC "-lssp_nonshared"
++#elif defined(TARGET_LIBC_PROVIDES_SSP)
+ #define LINK_SSP_SPEC "%{fstack-protector|fstack-protector-all" \
+ 		       "|fstack-protector-strong|fstack-protector-explicit:}"
+ #else

toolchain/gcc/patches/6.1.0/800-arm_v5te_no_ldrd_strd.patch

+--- a/gcc/config/arm/arm.h
++++ b/gcc/config/arm/arm.h
+@@ -166,7 +166,7 @@ extern void (*arm_lang_output_object_att
+ /* Thumb-1 only.  */
+ #define TARGET_THUMB1_ONLY		(TARGET_THUMB1 && !arm_arch_notm)
+ 
+-#define TARGET_LDRD			(arm_arch5e && ARM_DOUBLEWORD_ALIGN \
++#define TARGET_LDRD			(arm_arch6 && ARM_DOUBLEWORD_ALIGN \
+                                          && !TARGET_THUMB1)
+ 
+ #define TARGET_CRC32			(arm_arch_crc)

toolchain/gcc/patches/6.1.0/810-arm-softfloat-libgcc.patch

+--- a/libgcc/config/arm/t-linux
++++ b/libgcc/config/arm/t-linux
+@@ -1,6 +1,10 @@
+ LIB1ASMSRC = arm/lib1funcs.S
+ LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_lnx _clzsi2 _clzdi2 \
+-	_ctzsi2 _arm_addsubdf3 _arm_addsubsf3
++	_ctzsi2 _arm_addsubdf3 _arm_addsubsf3 \
++	_arm_negdf2 _arm_muldivdf3 _arm_cmpdf2 _arm_unorddf2 \
++	_arm_fixdfsi _arm_fixunsdfsi _arm_truncdfsf2 \
++	_arm_negsf2 _arm_muldivsf3 _arm_cmpsf2 _arm_unordsf2 \
++	_arm_fixsfsi _arm_fixunssfsi
+ 
+ # Just for these, we omit the frame pointer since it makes such a big
+ # difference.
+--- a/gcc/config/arm/linux-elf.h
++++ b/gcc/config/arm/linux-elf.h
+@@ -60,8 +60,6 @@
+    %{shared:-lc} \
+    %{!shared:%{profile:-lc_p}%{!profile:-lc}}"
+ 
+-#define LIBGCC_SPEC "%{mfloat-abi=soft*:-lfloat} -lgcc"
+-
+ #define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
+ 
+ #define LINUX_TARGET_LINK_SPEC  "%{h*} \

toolchain/gcc/patches/6.1.0/820-libgcc_pic.patch

+--- a/libgcc/Makefile.in
++++ b/libgcc/Makefile.in
+@@ -888,11 +888,12 @@ $(libgcov-driver-objects): %$(objext): $
+ 
+ # Static libraries.
+ libgcc.a: $(libgcc-objects)
++libgcc_pic.a: $(libgcc-s-objects)
+ libgcov.a: $(libgcov-objects)
+ libunwind.a: $(libunwind-objects)
+ libgcc_eh.a: $(libgcc-eh-objects)
+ 
+-libgcc.a libgcov.a libunwind.a libgcc_eh.a:
++libgcc.a libgcov.a libunwind.a libgcc_eh.a libgcc_pic.a:
+ 	-rm -f $@
+ 
+ 	objects="$(objects)";					\
+@@ -913,7 +914,7 @@ all: libunwind.a
+ endif
+ 
+ ifeq ($(enable_shared),yes)
+-all: libgcc_eh.a libgcc_s$(SHLIB_EXT)
++all: libgcc_eh.a libgcc_pic.a libgcc_s$(SHLIB_EXT)
+ ifneq ($(LIBUNWIND),)
+ all: libunwind$(SHLIB_EXT)
+ libgcc_s$(SHLIB_EXT): libunwind$(SHLIB_EXT)
+@@ -1115,6 +1116,10 @@ install-shared:
+ 	chmod 644 $(DESTDIR)$(inst_libdir)/libgcc_eh.a
+ 	$(RANLIB) $(DESTDIR)$(inst_libdir)/libgcc_eh.a
+ 
++	$(INSTALL_DATA) libgcc_pic.a $(mapfile) $(DESTDIR)$(inst_libdir)/
++	chmod 644 $(DESTDIR)$(inst_libdir)/libgcc_pic.a
++	$(RANLIB) $(DESTDIR)$(inst_libdir)/libgcc_pic.a
++
+ 	$(subst @multilib_dir@,$(MULTIDIR),$(subst \
+ 		@shlib_base_name@,libgcc_s,$(subst \
+ 		@shlib_slibdir_qual@,$(MULTIOSSUBDIR),$(SHLIB_INSTALL))))

toolchain/gcc/patches/6.1.0/830-arm_unbreak_armv4t.patch

+http://sourceware.org/ml/crossgcc/2008-05/msg00009.html
+
+--- a/gcc/config/arm/linux-eabi.h
++++ b/gcc/config/arm/linux-eabi.h
+@@ -45,7 +45,7 @@
+    The ARM10TDMI core is the default for armv5t, so set
+    SUBTARGET_CPU_DEFAULT to achieve this.  */
+ #undef  SUBTARGET_CPU_DEFAULT
+-#define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm10tdmi
++#define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm9tdmi
+ 
+ /* TARGET_BIG_ENDIAN_DEFAULT is set in
+    config.gcc for big endian configurations.  */

toolchain/gcc/patches/6.1.0/840-armv4_pass_fix-v4bx_to_ld.patch

+--- a/gcc/config/arm/linux-eabi.h
++++ b/gcc/config/arm/linux-eabi.h
+@@ -94,10 +94,15 @@
+ #define MUSL_DYNAMIC_LINKER \
+   "/lib/ld-musl-arm" MUSL_DYNAMIC_LINKER_E "%{mfloat-abi=hard:hf}.so.1"
+ 
++/* For armv4 we pass --fix-v4bx to linker to support EABI */
++#undef TARGET_FIX_V4BX_SPEC
++#define TARGET_FIX_V4BX_SPEC " %{mcpu=arm8|mcpu=arm810|mcpu=strongarm*"\
++  "|march=armv4|mcpu=fa526|mcpu=fa626:--fix-v4bx}"
++
+ /* At this point, bpabi.h will have clobbered LINK_SPEC.  We want to
+    use the GNU/Linux version, not the generic BPABI version.  */
+ #undef  LINK_SPEC
+-#define LINK_SPEC EABI_LINK_SPEC					\
++#define LINK_SPEC EABI_LINK_SPEC TARGET_FIX_V4BX_SPEC			\
+   LINUX_OR_ANDROID_LD (LINUX_TARGET_LINK_SPEC,				\
+ 		       LINUX_TARGET_LINK_SPEC " " ANDROID_LINK_SPEC)
+ 

toolchain/gcc/patches/6.1.0/850-use_shared_libgcc.patch

+--- a/gcc/config/arm/linux-eabi.h
++++ b/gcc/config/arm/linux-eabi.h
+@@ -132,10 +132,6 @@
+   "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} "	\
+   LINUX_OR_ANDROID_LD (GNU_USER_TARGET_ENDFILE_SPEC, ANDROID_ENDFILE_SPEC)
+ 
+-/* Use the default LIBGCC_SPEC, not the version in linux-elf.h, as we
+-   do not use -lfloat.  */
+-#undef LIBGCC_SPEC
+-
+ /* Clear the instruction cache from `beg' to `end'.  This is
+    implemented in lib1funcs.S, so ensure an error if this definition
+    is used.  */
+--- a/gcc/config/linux.h
++++ b/gcc/config/linux.h
+@@ -53,6 +53,10 @@ see the files COPYING3 and COPYING.RUNTI
+ 	builtin_assert ("system=posix");			\
+     } while (0)
+ 
++#ifndef LIBGCC_SPEC
++#define LIBGCC_SPEC "%{static|static-libgcc:-lgcc}%{!static:%{!static-libgcc:-lgcc_s}}"
++#endif
++
+ /* Determine which dynamic linker to use depending on whether GLIBC or
+    uClibc or Bionic or musl is the default C library and whether
+    -muclibc or -mglibc or -mbionic or -mmusl has been passed to change
+--- a/libgcc/mkmap-symver.awk
++++ b/libgcc/mkmap-symver.awk
+@@ -132,5 +132,5 @@ function output(lib) {
+   else if (inherit[lib])
+     printf("} %s;\n", inherit[lib]);
+   else
+-    printf ("\n  local:\n\t*;\n};\n");
++    printf ("\n\t*;\n};\n");
+ }
+--- a/gcc/config/rs6000/linux.h
++++ b/gcc/config/rs6000/linux.h
+@@ -60,6 +60,9 @@
+ #undef	CPP_OS_DEFAULT_SPEC
+ #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
+ 
++#undef LIBGCC_SPEC
++#define LIBGCC_SPEC "%{!static:%{!static-libgcc:-lgcc_s}} -lgcc"
++
+ #undef  LINK_SHLIB_SPEC
+ #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
+ 

toolchain/gcc/patches/6.1.0/851-libgcc_no_compat.patch

+--- a/libgcc/config/t-libunwind
++++ b/libgcc/config/t-libunwind
+@@ -2,8 +2,7 @@
+ 
+ HOST_LIBGCC2_CFLAGS += -DUSE_GAS_SYMVER
+ 
+-LIB2ADDEH = $(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c \
+-  $(srcdir)/unwind-compat.c $(srcdir)/unwind-dw2-fde-compat.c
++LIB2ADDEH = $(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c
+ LIB2ADDEHSTATIC = $(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c
+ 
+ # Override the default value from t-slibgcc-elf-ver and mention -lunwind

toolchain/gcc/patches/6.1.0/870-ppc_no_crtsavres.patch

+--- a/gcc/config/rs6000/rs6000.c
++++ b/gcc/config/rs6000/rs6000.c
+@@ -23090,7 +23090,7 @@ rs6000_savres_strategy (rs6000_stack_t *
+   /* Define cutoff for using out-of-line functions to save registers.  */
+   if (DEFAULT_ABI == ABI_V4 || TARGET_ELF)
+     {
+-      if (!optimize_size)
++      if (1)
+ 	{
+ 	  strategy |= SAVE_INLINE_FPRS | REST_INLINE_FPRS;
+ 	  strategy |= SAVE_INLINE_GPRS | REST_INLINE_GPRS;

toolchain/gcc/patches/6.1.0/880-no_java_section.patch

+--- a/gcc/defaults.h
++++ b/gcc/defaults.h
+@@ -395,7 +395,7 @@ see the files COPYING3 and COPYING.RUNTI
+ /* If we have named section and we support weak symbols, then use the
+    .jcr section for recording java classes which need to be registered
+    at program start-up time.  */
+-#if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
++#if 0 && defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
+ #ifndef JCR_SECTION_NAME
+ #define JCR_SECTION_NAME ".jcr"
+ #endif

toolchain/gcc/patches/6.1.0/900-bad-mips16-crt.patch

+--- a/libgcc/config/mips/t-mips16
++++ b/libgcc/config/mips/t-mips16
+@@ -43,3 +43,6 @@ SYNC_CFLAGS = -mno-mips16
+ 
+ # Version these symbols if building libgcc.so.
+ SHLIB_MAPFILES += $(srcdir)/config/mips/libgcc-mips16.ver
++
++CRTSTUFF_T_CFLAGS += -mno-mips16
++CRTSTUFF_T_CFLAGS_S += -mno-mips16

toolchain/gcc/patches/6.1.0/910-mbsd_multi.patch

+
+	This patch brings over a few features from MirBSD:
+	* -fhonour-copts
+	  If this option is not given, it's warned (depending
+	  on environment variables). This is to catch errors
+	  of misbuilt packages which override CFLAGS themselves.
+	* -Werror-maybe-reset
+	  Has the effect of -Wno-error if GCC_NO_WERROR is
+	  set and not '0', a no-operation otherwise. This is
+	  to be able to use -Werror in "make" but prevent
+	  GNU autoconf generated configure scripts from
+	  freaking out.
+
+	This patch was authored by Thorsten Glaser <tg at mirbsd.de>
+	with copyright assignment to the FSF in effect.
+
+--- a/gcc/c-family/c-opts.c
++++ b/gcc/c-family/c-opts.c
+@@ -107,6 +107,9 @@ static int class_dump_flags;
+ /* Whether any standard preincluded header has been preincluded.  */
+ static bool done_preinclude;
+ 
++/* Check if a port honours COPTS.  */
++static int honour_copts = 0;
++
+ static void handle_OPT_d (const char *);
+ static void set_std_cxx98 (int);
+ static void set_std_cxx11 (int);
+@@ -442,6 +445,12 @@ c_common_handle_option (size_t scode, co
+       flag_no_builtin = !value;
+       break;
+ 
++    case OPT_fhonour_copts:
++      if (c_language == clk_c) {
++        honour_copts++;
++      }
++      break;
++
+     case OPT_fconstant_string_class_:
+       constant_string_class_name = arg;
+       break;
+@@ -1041,6 +1050,47 @@ c_common_init (void)
+       return false;
+     }
+ 
++  if (c_language == clk_c) {
++    char *ev = getenv ("GCC_HONOUR_COPTS");
++    int evv;
++    if (ev == NULL)
++      evv = -1;
++    else if ((*ev == '0') || (*ev == '\0'))
++      evv = 0;
++    else if (*ev == '1')
++      evv = 1;
++    else if (*ev == '2')
++      evv = 2;
++    else if (*ev == 's')
++      evv = -1;
++    else {
++      warning (0, "unknown GCC_HONOUR_COPTS value, assuming 1");
++      evv = 1; /* maybe depend this on something like MIRBSD_NATIVE?  */
++    }
++    if (evv == 1) {
++      if (honour_copts == 0) {
++        error ("someone does not honour COPTS at all in lenient mode");
++        return false;
++      } else if (honour_copts != 1) {
++        warning (0, "someone does not honour COPTS correctly, passed %d times",
++         honour_copts);
++      }
++    } else if (evv == 2) {
++      if (honour_copts == 0) {
++        error ("someone does not honour COPTS at all in strict mode");
++        return false;
++      } else if (honour_copts != 1) {
++        error ("someone does not honour COPTS correctly, passed %d times",
++         honour_copts);
++        return false;
++      }
++    } else if (evv == 0) {
++      if (honour_copts != 1)
++        inform (0, "someone does not honour COPTS correctly, passed %d times",
++         honour_copts);
++    }
++  }
++
+   return true;
+ }
+ 
+--- a/gcc/c-family/c.opt
++++ b/gcc/c-family/c.opt
+@@ -438,6 +438,10 @@ Wfloat-conversion
+ C ObjC C++ ObjC++ Var(warn_float_conversion) Warning LangEnabledBy(C ObjC C++ ObjC++,Wconversion)
+ Warn for implicit type conversions that cause loss of floating point precision.
+ 
++Werror-maybe-reset
++C ObjC C++ ObjC++
++; Documented in common.opt
++
+ Wfloat-equal
+ C ObjC C++ ObjC++ Var(warn_float_equal) Warning
+ Warn if testing floating point numbers for equality.
+@@ -1252,6 +1256,9 @@ C++ ObjC++ Optimization Alias(fexception
+ fhonor-std
+ C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
+ 
++fhonour-copts
++C ObjC C++ ObjC++ RejectNegative
++
+ fhosted
+ C ObjC
+ Assume normal C execution environment.
+--- a/gcc/common.opt
++++ b/gcc/common.opt
+@@ -581,6 +581,10 @@ Werror=
+ Common Joined
+ Treat specified warning as error.
+ 
++Werror-maybe-reset
++Common
++If environment variable GCC_NO_WERROR is set, act as -Wno-error
++
+ Wextra
+ Common Var(extra_warnings) Warning
+ Print extra (possibly unwanted) warnings.
+@@ -1432,6 +1436,9 @@ fguess-branch-probability
+ Common Report Var(flag_guess_branch_prob) Optimization
+ Enable guessing of branch probabilities.
+ 
++fhonour-copts
++Common RejectNegative
++
+ ; Nonzero means ignore `#ident' directives.  0 means handle them.
+ ; Generate position-independent code for executables if possible
+ ; On SVR4 targets, it also controls whether or not to emit a
+--- a/gcc/opts.c
++++ b/gcc/opts.c
+@@ -1783,6 +1783,17 @@ common_handle_option (struct gcc_options
+ 			       opts, opts_set, loc, dc);
+       break;
+ 
++    case OPT_Werror_maybe_reset:
++      {
++        char *ev = getenv ("GCC_NO_WERROR");
++        if ((ev != NULL) && (*ev != '0'))
++          warnings_are_errors = 0;
++      }
++      break;
++
++    case OPT_fhonour_copts:
++      break;
++
+     case OPT_Wlarger_than_:
+       opts->x_larger_than_size = value;
+       opts->x_warn_larger_than = value != -1;
+--- a/gcc/doc/cppopts.texi
++++ b/gcc/doc/cppopts.texi
+@@ -163,6 +163,11 @@ in older programs.  This warning is on b
+ Make all warnings into hard errors.  Source code which triggers warnings
+ will be rejected.
+ 
++ at item -Werror-maybe-reset
++ at opindex Werror-maybe-reset
++Act like @samp{-Wno-error} if the @env{GCC_NO_WERROR} environment
++variable is set to anything other than 0 or empty.
++
+ @item -Wsystem-headers
+ @opindex Wsystem-headers
+ Issue warnings for code in system headers.  These are normally unhelpful
+--- a/gcc/doc/invoke.texi
++++ b/gcc/doc/invoke.texi
+@@ -263,7 +263,7 @@ Objective-C and Objective-C++ Dialects}.
+ -Wno-discarded-qualifiers -Wno-discarded-array-qualifiers @gol
+ -Wno-div-by-zero -Wdouble-promotion -Wduplicated-cond @gol
+ -Wempty-body  -Wenum-compare -Wno-endif-labels @gol
+--Werror  -Werror=* -Wfatal-errors -Wfloat-equal  -Wformat  -Wformat=2 @gol
++-Werror  -Werror=* -Werror-maybe-reset -Wfatal-errors -Wfloat-equal  -Wformat  -Wformat=2 @gol
+ -Wno-format-contains-nul -Wno-format-extra-args -Wformat-nonliteral @gol
+ -Wformat-security  -Wformat-signedness  -Wformat-y2k -Wframe-address @gol
+ -Wframe-larger-than=@var{len} -Wno-free-nonheap-object -Wjump-misses-init @gol
+@@ -5736,6 +5736,22 @@ This option is only supported for C and
+ @option{-Wall} and by @option{-Wpedantic}, which can be disabled with
+ @option{-Wno-pointer-sign}.
+ 
++ at item -Werror-maybe-reset
++ at opindex Werror-maybe-reset
++Act like @samp{-Wno-error} if the @env{GCC_NO_WERROR} environment
++variable is set to anything other than 0 or empty.
++
++ at item -fhonour-copts
++ at opindex fhonour-copts
++If @env{GCC_HONOUR_COPTS} is set to 1, abort if this option is not
++given at least once, and warn if it is given more than once.
++If @env{GCC_HONOUR_COPTS} is set to 2, abort if this option is not
++given exactly once.
++If @env{GCC_HONOUR_COPTS} is set to 0 or unset, warn if this option
++is not given exactly once.
++The warning is quelled if @env{GCC_HONOUR_COPTS} is set to @samp{s}.
++This flag and environment variable only affect the C language.
++
+ @item -Wstack-protector
+ @opindex Wstack-protector
+ @opindex Wno-stack-protector
+@@ -6604,7 +6620,7 @@ so, the first branch is redirected to ei
+ second branch or a point immediately following it, depending on whether
+ the condition is known to be true or false.
+ 
+-Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
++Enabled at levels @option{-O3}.
+ 
+ @item -fsplit-wide-types
+ @opindex fsplit-wide-types
+--- a/gcc/java/jvspec.c
++++ b/gcc/java/jvspec.c
+@@ -629,6 +629,7 @@ lang_specific_pre_link (void)
+      class name.  Append dummy `.c' that can be stripped by set_input so %b
+      is correct.  */ 
+   set_input (concat (main_class_name, "main.c", NULL));
++  putenv ("GCC_HONOUR_COPTS=s"); /* XXX hack!  */
+   err = do_spec (jvgenmain_spec);
+   if (err == 0)
+     {

toolchain/gcc/patches/6.1.0/920-specs_nonfatal_getenv.patch

+--- a/gcc/gcc.c
++++ b/gcc/gcc.c
+@@ -9194,8 +9194,10 @@ getenv_spec_function (int argc, const ch
+     value = varname;
+ 
+   if (!value)
+-    fatal_error (input_location,
+-		 "environment variable %qs not defined", varname);
++    {
++      warning (input_location, "environment variable %qs not defined", varname);
++      value = "";
++    }
+ 
+   /* We have to escape every character of the environment variable so
+      they are not interpreted as active spec characters.  A