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@@ -29,6 +29,16 @@
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static void set_Wimplicit (int);
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static void handle_OPT_d (const char *);
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static void set_std_cxx98 (int);
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+@@ -454,6 +457,9 @@
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+ enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC);
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+ break;
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+
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++ case OPT_Werror_maybe_reset:
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++ break;
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++
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+ case OPT_Wformat:
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+ set_Wformat (value);
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+ break;
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@@ -690,6 +701,12 @@
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flag_exceptions = value;
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break;
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@@ -138,7 +148,7 @@
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; On SVR4 targets, it also controls whether or not to emit a
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--- a/gcc/opts.c
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+++ b/gcc/opts.c
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-@@ -891,8 +891,6 @@
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+@@ -896,8 +896,6 @@
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flag_schedule_insns_after_reload = opt2;
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#endif
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flag_regmove = opt2;
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@@ -147,25 +157,24 @@
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flag_reorder_blocks = opt2;
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flag_reorder_functions = opt2;
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flag_tree_vrp = opt2;
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-@@ -912,6 +910,9 @@
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+@@ -922,6 +919,8 @@
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/* -O3 optimizations. */
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opt3 = (optimize >= 3);
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+ flag_strict_aliasing = opt3;
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+ flag_strict_overflow = opt3;
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-+ flag_delete_null_pointer_checks = opt3;
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flag_predictive_commoning = opt3;
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flag_inline_functions = opt3;
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flag_unswitch_loops = opt3;
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-@@ -1638,6 +1639,17 @@
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+@@ -1601,6 +1601,17 @@
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enable_warning_as_error (arg, value, lang_mask);
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break;
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+ case OPT_Werror_maybe_reset:
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+ {
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-+ char *ev = getenv ("GCC_NO_WERROR");
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-+ if ((ev != NULL) && (*ev != '0'))
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-+ warnings_are_errors = 0;
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++ char *ev = getenv ("GCC_NO_WERROR");
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++ if ((ev != NULL) && (*ev != '0'))
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++ warnings_are_errors = 0;
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+ }
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+ break;
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+
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@@ -173,8 +182,8 @@
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+ break;
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+
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case OPT_Wlarger_than_:
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- /* This form corresponds to -Wlarger-than-.
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- Kept for backward compatibility.
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+ /* This form corresponds to -Wlarger-than-.
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+ Kept for backward compatibility.
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--- a/gcc/doc/cppopts.texi
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+++ b/gcc/doc/cppopts.texi
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@@ -164,6 +164,11 @@
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@@ -232,15 +241,6 @@
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@item -fsplit-wide-types
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@opindex fsplit-wide-types
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-@@ -5844,7 +5860,7 @@
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- @option{-fno-delete-null-pointer-checks} to disable this optimization
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- for programs which depend on that behavior.
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-
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--Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
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-+Enabled at levels @option{-O3}.
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-
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- @item -fexpensive-optimizations
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- @opindex fexpensive-optimizations
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--- a/gcc/java/jvspec.c
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+++ b/gcc/java/jvspec.c
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@@ -670,6 +670,7 @@
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Florian Fainelli