+
+ 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.
+ * Make -fno-strict-aliasing and -fno-delete-null-pointer-checks
+ the default for -O2/-Os, because they trigger gcc bugs
+ and can delete code with security implications.
+
+ This patch was authored by Thorsten Glaser <tg@mirbsd.de>
+ with copyright assignment to the FSF in effect.
+
+Index: gcc-4.2.0/gcc/c-opts.c
+===================================================================
+--- gcc-4.2.0.orig/gcc/c-opts.c 2007-07-31 02:27:12.007256629 +0200
++++ gcc-4.2.0/gcc/c-opts.c 2007-07-31 02:27:39.324813371 +0200
+@@ -107,6 +107,9 @@
+ /* Number of deferred options scanned for -include. */
+ static size_t include_cursor;
+
++/* Check if a port honours COPTS. */
++static int honour_copts = 0;
++
+ static void set_Wimplicit (int);
+ static void handle_OPT_d (const char *);
+ static void set_std_cxx98 (int);
+@@ -449,6 +452,14 @@
+ mesg_implicit_function_declaration = 2;
+ break;
+
++ case OPT_Werror_maybe_reset:
++ {
++ char *ev = getenv ("GCC_NO_WERROR");
++ if ((ev != NULL) && (*ev != '0'))
++ cpp_opts->warnings_are_errors = 0;
++ }
++ break;
++
+ case OPT_Wformat:
+ set_Wformat (value);
+ break;
+@@ -691,6 +702,12 @@
+ flag_exceptions = value;
+ break;
+
++ case OPT_fhonour_copts:
++ if (c_language == clk_c) {
++ honour_copts++;
++ }
++ break;
++
+ case OPT_fimplement_inlines:
+ flag_implement_inlines = value;
+ break;
+@@ -1151,6 +1168,47 @@
+ /* Has to wait until now so that cpplib has its hash table. */
+ init_pragma ();
+
++ if (c_language == clk_c) {
++ char *ev = getenv ("GCC_HONOUR_COPTS");
++ int evv;
++ if (ev == NULL)
++ evv = 0;
++ 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 ("someone does not honour COPTS correctly, passed %d times",
++ honour_copts);
++ }
++ }
++
+ return true;
+ }
+
+Index: gcc-4.2.0/gcc/c.opt
+===================================================================
+--- gcc-4.2.0.orig/gcc/c.opt 2007-07-31 02:27:12.015257093 +0200
++++ gcc-4.2.0/gcc/c.opt 2007-07-31 02:27:39.328813597 +0200
+@@ -189,6 +189,10 @@
+ C ObjC RejectNegative
+ Make implicit function declarations an error
+
++Werror-maybe-reset
++C ObjC C++ ObjC++
++; Documented in common.opt
++
+ Wfloat-equal
+ C ObjC C++ ObjC++ Var(warn_float_equal)
+ Warn if testing floating point numbers for equality
+@@ -544,6 +548,9 @@
+ fhonor-std
+ C++ ObjC++
+
++fhonour-copts
++C ObjC C++ ObjC++ RejectNegative
++
+ fhosted
+ C ObjC
+ Assume normal C execution environment
+Index: gcc-4.2.0/gcc/common.opt
+===================================================================
+--- gcc-4.2.0.orig/gcc/common.opt 2007-07-31 02:27:12.023257546 +0200
++++ gcc-4.2.0/gcc/common.opt 2007-07-31 02:27:39.360815422 +0200
+@@ -81,6 +81,10 @@
+ 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
+ Print extra (possibly unwanted) warnings
+@@ -481,6 +485,9 @@
+ Common Report Var(flag_guess_branch_prob)
+ 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
+Index: gcc-4.2.0/gcc/opts.c
+===================================================================
+--- gcc-4.2.0.orig/gcc/opts.c 2007-07-31 02:27:12.031257991 +0200
++++ gcc-4.2.0/gcc/opts.c 2007-07-31 02:28:36.320061346 +0200
+@@ -492,9 +492,6 @@
+ flag_schedule_insns_after_reload = 1;
+ #endif
+ flag_regmove = 1;
+- flag_strict_aliasing = 1;
+- flag_strict_overflow = 1;
+- flag_delete_null_pointer_checks = 1;
+ flag_reorder_blocks = 1;
+ flag_reorder_functions = 1;
+ flag_tree_store_ccp = 1;
+@@ -510,6 +507,10 @@
+
+ if (optimize >= 3)
+ {
++ flag_strict_aliasing = 1;
++ flag_strict_overflow = 1;
++ flag_delete_null_pointer_checks = 1;
++
+ flag_inline_functions = 1;
+ flag_unswitch_loops = 1;
+ flag_gcse_after_reload = 1;
+@@ -711,6 +712,17 @@
+ }
+ 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_Wextra:
+ set_Wextra (value);
+ break;
+Index: gcc-4.2.0/gcc/doc/cppopts.texi
+===================================================================
+--- gcc-4.2.0.orig/gcc/doc/cppopts.texi 2007-07-31 02:27:12.039258455 +0200
++++ gcc-4.2.0/gcc/doc/cppopts.texi 2007-07-31 02:27:39.408818157 +0200
+@@ -166,6 +166,11 @@
+ Make all warnings into hard errors. Source code which triggers warnings
+ will be rejected.
+
++@item -Werror-maybe-reset
++@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
+Index: gcc-4.2.0/gcc/doc/invoke.texi
+===================================================================
+--- gcc-4.2.0.orig/gcc/doc/invoke.texi 2007-07-31 02:27:12.047258920 +0200
++++ gcc-4.2.0/gcc/doc/invoke.texi 2007-07-31 02:29:13.218164047 +0200
+@@ -226,7 +226,7 @@
+ -Wc++-compat -Wcast-align -Wcast-qual -Wchar-subscripts -Wcomment @gol
+ -Wconversion -Wno-deprecated-declarations @gol
+ -Wdisabled-optimization -Wno-div-by-zero -Wno-endif-labels @gol
+--Werror -Werror=* -Werror-implicit-function-declaration @gol
++-Werror -Werror-maybe-reset -Werror=* -Werror-implicit-function-declaration @gol
+ -Wfatal-errors -Wfloat-equal -Wformat -Wformat=2 @gol
+ -Wno-format-extra-args -Wformat-nonliteral @gol
+ -Wformat-security -Wformat-y2k @gol
+@@ -3569,6 +3569,22 @@
+ @option{-W}@var{foo}. However, @option{-Wno-error=}@var{foo} does not
+ imply anything.
+
++@item -Werror-maybe-reset
++@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 -fhonour-copts
++@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
+ This option is only active when @option{-fstack-protector} is active. It
+@@ -4901,7 +4917,7 @@
+ 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 -fcse-follow-jumps
+ @opindex fcse-follow-jumps
+@@ -5019,7 +5035,7 @@
+ @option{-fno-delete-null-pointer-checks} to disable this optimization
+ for programs which depend on that behavior.
+
+-Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
++Enabled at levels @option{-O3}.
+
+ @item -fexpensive-optimizations
+ @opindex fexpensive-optimizations
+@@ -5437,7 +5453,7 @@
+ allowed to alias. For an example, see the C front-end function
+ @code{c_get_alias_set}.
+
+-Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
++Enabled at levels @option{-O3}.
+
+ @item -fstrict-overflow
+ @opindex fstrict-overflow
+Index: gcc-4.2.0/gcc/java/jvspec.c
+===================================================================
+--- gcc-4.2.0.orig/gcc/java/jvspec.c 2007-07-31 02:27:12.055259364 +0200
++++ gcc-4.2.0/gcc/java/jvspec.c 2007-07-31 02:27:39.484822490 +0200
+@@ -632,6 +632,7 @@
+ 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)
+ {
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