toolchain/gcc/patches/4.2.1/910-mbsd_multi.patch

   1
   2         This patch brings over a few features from MirBSD:
   3         * -fhonour-copts
   4           If this option is not given, it's warned (depending
   5           on environment variables). This is to catch errors
   6           of misbuilt packages which override CFLAGS themselves.
   7         * -Werror-maybe-reset
   8           Has the effect of -Wno-error if GCC_NO_WERROR is
   9           set and not '0', a no-operation otherwise. This is
  10           to be able to use -Werror in "make" but prevent
  11           GNU autoconf generated configure scripts from
  12           freaking out.
  13         * Make -fno-strict-aliasing and -fno-delete-null-pointer-checks
  14           the default for -O2/-Os, because they trigger gcc bugs
  15           and can delete code with security implications.
  16
  17         This patch was authored by Thorsten Glaser <tg@mirbsd.de>
  18         with copyright assignment to the FSF in effect.
  19
  20 Index: gcc-4.2.0/gcc/c-opts.c
  21 ===================================================================
  22 --- gcc-4.2.0.orig/gcc/c-opts.c 2007-07-31 02:27:12.007256629 +0200
  23 +++ gcc-4.2.0/gcc/c-opts.c      2007-07-31 02:27:39.324813371 +0200
  24 @@ -107,6 +107,9 @@
  25  /* Number of deferred options scanned for -include.  */
  26  static size_t include_cursor;
  27
  28 +/* Check if a port honours COPTS.  */
  29 +static int honour_copts = 0;
  30 +
  31  static void set_Wimplicit (int);
  32  static void handle_OPT_d (const char *);
  33  static void set_std_cxx98 (int);
  34 @@ -449,6 +452,14 @@
  35        mesg_implicit_function_declaration = 2;
  36        break;
  37
  38 +    case OPT_Werror_maybe_reset:
  39 +      {
  40 +       char *ev = getenv ("GCC_NO_WERROR");
  41 +       if ((ev != NULL) && (*ev != '0'))
  42 +         cpp_opts->warnings_are_errors = 0;
  43 +      }
  44 +      break;
  45 +
  46      case OPT_Wformat:
  47        set_Wformat (value);
  48        break;
  49 @@ -691,6 +702,12 @@
  50        flag_exceptions = value;
  51        break;
  52
  53 +    case OPT_fhonour_copts:
  54 +      if (c_language == clk_c) {
  55 +       honour_copts++;
  56 +      }
  57 +      break;
  58 +
  59      case OPT_fimplement_inlines:
  60        flag_implement_inlines = value;
  61        break;
  62 @@ -1151,6 +1168,47 @@
  63    /* Has to wait until now so that cpplib has its hash table.  */
  64    init_pragma ();
  65
  66 +  if (c_language == clk_c) {
  67 +    char *ev = getenv ("GCC_HONOUR_COPTS");
  68 +    int evv;
  69 +    if (ev == NULL)
  70 +      evv = -1;
  71 +    else if ((*ev == '0') || (*ev == '\0'))
  72 +      evv = 0;
  73 +    else if (*ev == '1')
  74 +      evv = 1;
  75 +    else if (*ev == '2')
  76 +      evv = 2;
  77 +    else if (*ev == 's')
  78 +      evv = -1;
  79 +    else {
  80 +      warning (0, "unknown GCC_HONOUR_COPTS value, assuming 1");
  81 +      evv = 1; /* maybe depend this on something like MIRBSD_NATIVE?  */
  82 +    }
  83 +    if (evv == 1) {
  84 +      if (honour_copts == 0) {
  85 +       error ("someone does not honour COPTS at all in lenient mode");
  86 +       return false;
  87 +      } else if (honour_copts != 1) {
  88 +       warning (0, "someone does not honour COPTS correctly, passed %d times",
  89 +        honour_copts);
  90 +      }
  91 +    } else if (evv == 2) {
  92 +      if (honour_copts == 0) {
  93 +       error ("someone does not honour COPTS at all in strict mode");
  94 +       return false;
  95 +      } else if (honour_copts != 1) {
  96 +       error ("someone does not honour COPTS correctly, passed %d times",
  97 +        honour_copts);
  98 +       return false;
  99 +      }
 100 +    } else if (evv == 0) {
 101 +      if (honour_copts != 1)
 102 +       inform ("someone does not honour COPTS correctly, passed %d times",
 103 +        honour_copts);
 104 +    }
 105 +  }
 106 +
 107    return true;
 108  }
 109
 110 Index: gcc-4.2.0/gcc/c.opt
 111 ===================================================================
 112 --- gcc-4.2.0.orig/gcc/c.opt    2007-07-31 02:27:12.015257093 +0200
 113 +++ gcc-4.2.0/gcc/c.opt 2007-07-31 02:27:39.328813597 +0200
 114 @@ -189,6 +189,10 @@
 115  C ObjC RejectNegative
 116  Make implicit function declarations an error
 117
 118 +Werror-maybe-reset
 119 +C ObjC C++ ObjC++
 120 +; Documented in common.opt
 121 +
 122  Wfloat-equal
 123  C ObjC C++ ObjC++ Var(warn_float_equal)
 124  Warn if testing floating point numbers for equality
 125 @@ -544,6 +548,9 @@
 126  fhonor-std
 127  C++ ObjC++
 128
 129 +fhonour-copts
 130 +C ObjC C++ ObjC++ RejectNegative
 131 +
 132  fhosted
 133  C ObjC
 134  Assume normal C execution environment
 135 Index: gcc-4.2.0/gcc/common.opt
 136 ===================================================================
 137 --- gcc-4.2.0.orig/gcc/common.opt       2007-07-31 02:27:12.023257546 +0200
 138 +++ gcc-4.2.0/gcc/common.opt    2007-07-31 02:27:39.360815422 +0200
 139 @@ -81,6 +81,10 @@
 140  Common Joined
 141  Treat specified warning as error
 142
 143 +Werror-maybe-reset
 144 +Common
 145 +If environment variable GCC_NO_WERROR is set, act as -Wno-error
 146 +
 147  Wextra
 148  Common
 149  Print extra (possibly unwanted) warnings
 150 @@ -481,6 +485,9 @@
 151  Common Report Var(flag_guess_branch_prob)
 152  Enable guessing of branch probabilities
 153
 154 +fhonour-copts
 155 +Common RejectNegative
 156 +
 157  ; Nonzero means ignore `#ident' directives.  0 means handle them.
 158  ; Generate position-independent code for executables if possible
 159  ; On SVR4 targets, it also controls whether or not to emit a
 160 Index: gcc-4.2.0/gcc/opts.c
 161 ===================================================================
 162 --- gcc-4.2.0.orig/gcc/opts.c   2007-07-31 02:27:12.031257991 +0200
 163 +++ gcc-4.2.0/gcc/opts.c        2007-07-31 02:28:36.320061346 +0200
 164 @@ -492,9 +492,6 @@
 165        flag_schedule_insns_after_reload = 1;
 166  #endif
 167        flag_regmove = 1;
 168 -      flag_strict_aliasing = 1;
 169 -      flag_strict_overflow = 1;
 170 -      flag_delete_null_pointer_checks = 1;
 171        flag_reorder_blocks = 1;
 172        flag_reorder_functions = 1;
 173        flag_tree_store_ccp = 1;
 174 @@ -510,6 +507,10 @@
 175
 176    if (optimize >= 3)
 177      {
 178 +      flag_strict_aliasing = 1;
 179 +      flag_strict_overflow = 1;
 180 +      flag_delete_null_pointer_checks = 1;
 181 +
 182        flag_inline_functions = 1;
 183        flag_unswitch_loops = 1;
 184        flag_gcse_after_reload = 1;
 185 @@ -711,6 +712,17 @@
 186        }
 187        break;
 188
 189 +    case OPT_Werror_maybe_reset:
 190 +      {
 191 +       char *ev = getenv ("GCC_NO_WERROR");
 192 +       if ((ev != NULL) && (*ev != '0'))
 193 +         warnings_are_errors = 0;
 194 +      }
 195 +      break;
 196 +
 197 +    case OPT_fhonour_copts:
 198 +      break;
 199 +
 200      case OPT_Wextra:
 201        set_Wextra (value);
 202        break;
 203 Index: gcc-4.2.0/gcc/doc/cppopts.texi
 204 ===================================================================
 205 --- gcc-4.2.0.orig/gcc/doc/cppopts.texi 2007-07-31 02:27:12.039258455 +0200
 206 +++ gcc-4.2.0/gcc/doc/cppopts.texi      2007-07-31 02:27:39.408818157 +0200
 207 @@ -166,6 +166,11 @@
 208  Make all warnings into hard errors.  Source code which triggers warnings
 209  will be rejected.
 210
 211 +@item -Werror-maybe-reset
 212 +@opindex Werror-maybe-reset
 213 +Act like @samp{-Wno-error} if the @env{GCC_NO_WERROR} environment
 214 +variable is set to anything other than 0 or empty.
 215 +
 216  @item -Wsystem-headers
 217  @opindex Wsystem-headers
 218  Issue warnings for code in system headers.  These are normally unhelpful
 219 Index: gcc-4.2.0/gcc/doc/invoke.texi
 220 ===================================================================
 221 --- gcc-4.2.0.orig/gcc/doc/invoke.texi  2007-07-31 02:27:12.047258920 +0200
 222 +++ gcc-4.2.0/gcc/doc/invoke.texi       2007-07-31 02:29:13.218164047 +0200
 223 @@ -226,7 +226,7 @@
 224  -Wc++-compat -Wcast-align  -Wcast-qual  -Wchar-subscripts  -Wcomment @gol
 225  -Wconversion  -Wno-deprecated-declarations @gol
 226  -Wdisabled-optimization  -Wno-div-by-zero  -Wno-endif-labels @gol
 227 --Werror  -Werror=* -Werror-implicit-function-declaration @gol
 228 +-Werror -Werror-maybe-reset -Werror=* -Werror-implicit-function-declaration @gol
 229  -Wfatal-errors  -Wfloat-equal  -Wformat  -Wformat=2 @gol
 230  -Wno-format-extra-args -Wformat-nonliteral @gol
 231  -Wformat-security  -Wformat-y2k @gol
 232 @@ -3569,6 +3569,22 @@
 233  @option{-W}@var{foo}.  However, @option{-Wno-error=}@var{foo} does not
 234  imply anything.
 235
 236 +@item -Werror-maybe-reset
 237 +@opindex Werror-maybe-reset
 238 +Act like @samp{-Wno-error} if the @env{GCC_NO_WERROR} environment
 239 +variable is set to anything other than 0 or empty.
 240 +
 241 +@item -fhonour-copts
 242 +@opindex fhonour-copts
 243 +If @env{GCC_HONOUR_COPTS} is set to 1, abort if this option is not
 244 +given at least once, and warn if it is given more than once.
 245 +If @env{GCC_HONOUR_COPTS} is set to 2, abort if this option is not
 246 +given exactly once.
 247 +If @env{GCC_HONOUR_COPTS} is set to 0 or unset, warn if this option
 248 +is not given exactly once.
 249 +The warning is quelled if @env{GCC_HONOUR_COPTS} is set to @samp{s}.
 250 +This flag and environment variable only affect the C language.
 251 +
 252  @item -Wstack-protector
 253  @opindex Wstack-protector
 254  This option is only active when @option{-fstack-protector} is active.  It
 255 @@ -4901,7 +4917,7 @@
 256  second branch or a point immediately following it, depending on whether
 257  the condition is known to be true or false.
 258
 259 -Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
 260 +Enabled at levels @option{-O3}.
 261
 262  @item -fcse-follow-jumps
 263  @opindex fcse-follow-jumps
 264 @@ -5019,7 +5035,7 @@
 265  @option{-fno-delete-null-pointer-checks} to disable this optimization
 266  for programs which depend on that behavior.
 267
 268 -Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
 269 +Enabled at levels @option{-O3}.
 270
 271  @item -fexpensive-optimizations
 272  @opindex fexpensive-optimizations
 273 @@ -5437,7 +5453,7 @@
 274  allowed to alias.  For an example, see the C front-end function
 275  @code{c_get_alias_set}.
 276
 277 -Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
 278 +Enabled at levels @option{-O3}.
 279
 280  @item -fstrict-overflow
 281  @opindex fstrict-overflow
 282 Index: gcc-4.2.0/gcc/java/jvspec.c
 283 ===================================================================
 284 --- gcc-4.2.0.orig/gcc/java/jvspec.c    2007-07-31 02:27:12.055259364 +0200
 285 +++ gcc-4.2.0/gcc/java/jvspec.c 2007-07-31 02:27:39.484822490 +0200
 286 @@ -632,6 +632,7 @@
 287       class name.  Append dummy `.c' that can be stripped by set_input so %b
 288       is correct.  */
 289    set_input (concat (main_class_name, "main.c", NULL));
 290 +  putenv ("GCC_HONOUR_COPTS=s"); /* XXX hack!  */
 291    err = do_spec (jvgenmain_spec);
 292    if (err == 0)
 293      {