diff options
| -rw-r--r-- | package/gcc/patches/cflags.patch | 253 |
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) + { |