-
- 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 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
-@@ -104,6 +104,9 @@ static size_t include_cursor;
- /* 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);
-@@ -383,6 +386,9 @@ c_common_handle_option (size_t scode, co
- cpp_opts->warn_endif_labels = value;
- break;
-
-+ case OPT_Werror_maybe_reset:
-+ break;
-+
- case OPT_Winvalid_pch:
- cpp_opts->warn_invalid_pch = value;
- break;
-@@ -491,6 +497,12 @@ 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;
-@@ -1027,6 +1039,47 @@ 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
-@@ -379,6 +379,10 @@ Werror-implicit-function-declaration
- C ObjC RejectNegative Warning Alias(Werror=, implicit-function-declaration)
- This switch is deprecated; use -Werror=implicit-function-declaration instead
-
-+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
-@@ -949,6 +953,9 @@ 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
-@@ -541,6 +541,10 @@ 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
-@@ -1242,6 +1246,9 @@ 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
-@@ -468,8 +468,6 @@ static const struct default_options defa
- { OPT_LEVELS_2_PLUS, OPT_fschedule_insns2, NULL, 1 },
- #endif
- { OPT_LEVELS_2_PLUS, OPT_fregmove, NULL, 1 },
-- { OPT_LEVELS_2_PLUS, OPT_fstrict_aliasing, NULL, 1 },
-- { OPT_LEVELS_2_PLUS, OPT_fstrict_overflow, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_freorder_blocks, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_freorder_functions, NULL, 1 },
- { OPT_LEVELS_2_PLUS, OPT_ftree_vrp, NULL, 1 },
-@@ -489,6 +487,8 @@ static const struct default_options defa
- { OPT_LEVELS_2_PLUS, OPT_fhoist_adjacent_loads, NULL, 1 },
-
- /* -O3 optimizations. */
-+ { OPT_LEVELS_3_PLUS, OPT_fstrict_aliasing, NULL, 1 },
-+ { OPT_LEVELS_3_PLUS, OPT_fstrict_overflow, NULL, 1 },
- { OPT_LEVELS_3_PLUS, OPT_ftree_loop_distribute_patterns, NULL, 1 },
- { OPT_LEVELS_3_PLUS, OPT_fpredictive_commoning, NULL, 1 },
- /* Inlining of functions reducing size is a good idea with -Os
-@@ -1435,6 +1435,17 @@ 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
-@@ -240,7 +240,7 @@ Objective-C and Objective-C++ Dialects}.
- -Wconversion -Wcoverage-mismatch -Wno-cpp -Wno-deprecated @gol
- -Wno-deprecated-declarations -Wdisabled-optimization @gol
- -Wno-div-by-zero -Wdouble-promotion -Wempty-body -Wenum-compare @gol
---Wno-endif-labels -Werror -Werror=* @gol
-+-Wno-endif-labels -Werror -Werror=* -Werror-maybe-reset @gol
- -Wfatal-errors -Wfloat-equal -Wformat -Wformat=2 @gol
- -Wno-format-contains-nul -Wno-format-extra-args -Wformat-nonliteral @gol
- -Wformat-security -Wformat-y2k @gol
-@@ -4817,6 +4817,22 @@ 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
-@@ -6928,7 +6944,7 @@ 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
-@@ -626,6 +626,7 @@ 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)
- {
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