sync gcc patches from toolchain

1 files changed, 253 insertions, 0 deletions

diff --git a/package/gcc/patches/cflags.patch b/package/gcc/patches/cflags.patch
new file mode 100644
index 000000000..0d5815a54
--- /dev/null
+++ b/package/gcc/patches/cflags.patch
@@ -0,0 +1,253 @@
+
+	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-opts.c
++++ b/gcc/c-opts.c
+@@ -105,6 +105,9 @@
+ /* 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);
+@@ -454,6 +457,9 @@
+       enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC); 
+       break;
+ 
++    case OPT_Werror_maybe_reset:
++      break;
++
+     case OPT_Wformat:
+       set_Wformat (value);
+       break;
+@@ -690,6 +701,12 @@
+       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;
+@@ -1209,6 +1226,47 @@
+       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.opt
++++ b/gcc/c.opt
+@@ -215,6 +215,10 @@
+ C ObjC RejectNegative Warning
+ 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
+@@ -609,6 +613,9 @@
+ fhonor-std
+ C++ ObjC++
+ 
++fhonour-copts
++C ObjC C++ ObjC++ RejectNegative
++
+ fhosted
+ C ObjC
+ Assume normal C execution environment
+--- a/gcc/common.opt
++++ b/gcc/common.opt
+@@ -102,6 +102,10 @@
+ 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 Warning
+ Print extra (possibly unwanted) warnings
+@@ -573,6 +577,9 @@
+ 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
+@@ -896,8 +896,6 @@
+   flag_schedule_insns_after_reload = opt2;
+ #endif
+   flag_regmove = opt2;
+-  flag_strict_aliasing = opt2;
+-  flag_strict_overflow = opt2;
+   flag_reorder_blocks = opt2;
+   flag_reorder_functions = opt2;
+   flag_tree_vrp = opt2;
+@@ -922,6 +919,8 @@
+ 
+   /* -O3 optimizations.  */
+   opt3 = (optimize >= 3);
++  flag_strict_aliasing = opt3;
++  flag_strict_overflow = opt3;
+   flag_predictive_commoning = opt3;
+   flag_inline_functions = opt3;
+   flag_unswitch_loops = opt3;
+@@ -1601,6 +1601,17 @@
+       enable_warning_as_error (arg, value, lang_mask);
+       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_:
+       /* This form corresponds to -Wlarger-than-. 
+          Kept for backward compatibility.
+--- a/gcc/doc/cppopts.texi
++++ b/gcc/doc/cppopts.texi
+@@ -164,6 +164,11 @@
+ 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
+@@ -234,7 +234,7 @@
+ -Wconversion  -Wcoverage-mismatch  -Wno-deprecated  @gol
+ -Wno-deprecated-declarations -Wdisabled-optimization  @gol
+ -Wno-div-by-zero -Wempty-body  -Wenum-compare -Wno-endif-labels @gol
+--Werror  -Werror=* @gol
++-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
+@@ -4161,6 +4161,22 @@
+ @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
+@@ -5699,7 +5715,7 @@
+ 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 -fsplit-wide-types
+ @opindex fsplit-wide-types
+--- a/gcc/java/jvspec.c
++++ b/gcc/java/jvspec.c
+@@ -670,6 +670,7 @@
+      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)
+     {