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openwrt-owl/toolchain/gcc/patches/4.6-linaro/910-mbsd_multi.patch

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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
@@ -103,6 +103,9 @@ static size_t deferred_count;
/* 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 handle_OPT_d (const char *);
static void set_std_cxx98 (int);
static void set_std_cxx0x (int);
@@ -441,6 +444,9 @@ c_common_handle_option (size_t scode, co
global_dc->warning_as_error_requested = value;
break;
+ case OPT_Werror_maybe_reset:
+ break;
+
case OPT_Wformat:
set_Wformat (value);
break;
@@ -584,6 +590,12 @@ 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;
@@ -1058,6 +1070,47 @@ 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
@@ -363,6 +363,10 @@ 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
@@ -794,6 +798,9 @@ 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
@@ -520,6 +520,10 @@ 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
@@ -1156,6 +1160,9 @@ 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
@@ -477,8 +477,6 @@ 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 },
@@ -494,6 +492,8 @@ static const struct default_options defa
{ OPT_LEVELS_2_PLUS, OPT_falign_functions, 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
@@ -1405,6 +1405,17 @@ 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
@@ -164,6 +164,11 @@ 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
@@ -4497,6 +4497,22 @@ This option is only supported for C and
@option{-Wall} and by @option{-pedantic}, 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
@@ -6319,7 +6335,7 @@ 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
@@ -627,6 +627,7 @@ 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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