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openwrt/toolchain/gcc/patches/4.2.0/910-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@mirbsd.de>
with copyright assignment to the FSF in effect.
Index: gcc-4.2.0/gcc/c-opts.c
===================================================================
--- gcc-4.2.0.orig/gcc/c-opts.c 2007-07-31 02:27:12.007256629 +0200
+++ gcc-4.2.0/gcc/c-opts.c 2007-07-31 02:27:39.324813371 +0200
@@ -107,6 +107,9 @@
/* 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);
@@ -449,6 +452,14 @@
mesg_implicit_function_declaration = 2;
break;
+ case OPT_Werror_maybe_reset:
+ {
+ char *ev = getenv ("GCC_NO_WERROR");
+ if ((ev != NULL) && (*ev != '0'))
+ cpp_opts->warnings_are_errors = 0;
+ }
+ break;
+
case OPT_Wformat:
set_Wformat (value);
break;
@@ -691,6 +702,12 @@
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;
@@ -1151,6 +1168,47 @@
/* Has to wait until now so that cpplib has its hash table. */
init_pragma ();
+ 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 ("someone does not honour COPTS correctly, passed %d times",
+ honour_copts);
+ }
+ }
+
return true;
}
Index: gcc-4.2.0/gcc/c.opt
===================================================================
--- gcc-4.2.0.orig/gcc/c.opt 2007-07-31 02:27:12.015257093 +0200
+++ gcc-4.2.0/gcc/c.opt 2007-07-31 02:27:39.328813597 +0200
@@ -189,6 +189,10 @@
C ObjC RejectNegative
Make implicit function declarations an error
+Werror-maybe-reset
+C ObjC C++ ObjC++
+; Documented in common.opt
+
Wfloat-equal
C ObjC C++ ObjC++ Var(warn_float_equal)
Warn if testing floating point numbers for equality
@@ -544,6 +548,9 @@
fhonor-std
C++ ObjC++
+fhonour-copts
+C ObjC C++ ObjC++ RejectNegative
+
fhosted
C ObjC
Assume normal C execution environment
Index: gcc-4.2.0/gcc/common.opt
===================================================================
--- gcc-4.2.0.orig/gcc/common.opt 2007-07-31 02:27:12.023257546 +0200
+++ gcc-4.2.0/gcc/common.opt 2007-07-31 02:27:39.360815422 +0200
@@ -81,6 +81,10 @@
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
Print extra (possibly unwanted) warnings
@@ -481,6 +485,9 @@
Common Report Var(flag_guess_branch_prob)
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
Index: gcc-4.2.0/gcc/opts.c
===================================================================
--- gcc-4.2.0.orig/gcc/opts.c 2007-07-31 02:27:12.031257991 +0200
+++ gcc-4.2.0/gcc/opts.c 2007-07-31 02:28:36.320061346 +0200
@@ -492,9 +492,6 @@
flag_schedule_insns_after_reload = 1;
#endif
flag_regmove = 1;
- flag_strict_aliasing = 1;
- flag_strict_overflow = 1;
- flag_delete_null_pointer_checks = 1;
flag_reorder_blocks = 1;
flag_reorder_functions = 1;
flag_tree_store_ccp = 1;
@@ -510,6 +507,10 @@
if (optimize >= 3)
{
+ flag_strict_aliasing = 1;
+ flag_strict_overflow = 1;
+ flag_delete_null_pointer_checks = 1;
+
flag_inline_functions = 1;
flag_unswitch_loops = 1;
flag_gcse_after_reload = 1;
@@ -711,6 +712,17 @@
}
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_Wextra:
set_Wextra (value);
break;
Index: gcc-4.2.0/gcc/doc/cppopts.texi
===================================================================
--- gcc-4.2.0.orig/gcc/doc/cppopts.texi 2007-07-31 02:27:12.039258455 +0200
+++ gcc-4.2.0/gcc/doc/cppopts.texi 2007-07-31 02:27:39.408818157 +0200
@@ -166,6 +166,11 @@
Make all warnings into hard errors. Source code which triggers warnings
will be rejected.
+@item -Werror-maybe-reset
+@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
Index: gcc-4.2.0/gcc/doc/invoke.texi
===================================================================
--- gcc-4.2.0.orig/gcc/doc/invoke.texi 2007-07-31 02:27:12.047258920 +0200
+++ gcc-4.2.0/gcc/doc/invoke.texi 2007-07-31 02:29:13.218164047 +0200
@@ -226,7 +226,7 @@
-Wc++-compat -Wcast-align -Wcast-qual -Wchar-subscripts -Wcomment @gol
-Wconversion -Wno-deprecated-declarations @gol
-Wdisabled-optimization -Wno-div-by-zero -Wno-endif-labels @gol
--Werror -Werror=* -Werror-implicit-function-declaration @gol
+-Werror -Werror-maybe-reset -Werror=* -Werror-implicit-function-declaration @gol
-Wfatal-errors -Wfloat-equal -Wformat -Wformat=2 @gol
-Wno-format-extra-args -Wformat-nonliteral @gol
-Wformat-security -Wformat-y2k @gol
@@ -3569,6 +3569,22 @@
@option{-W}@var{foo}. However, @option{-Wno-error=}@var{foo} does not
imply anything.
+@item -Werror-maybe-reset
+@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 -fhonour-copts
+@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
This option is only active when @option{-fstack-protector} is active. It
@@ -4901,7 +4917,7 @@
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 -fcse-follow-jumps
@opindex fcse-follow-jumps
@@ -5019,7 +5035,7 @@
@option{-fno-delete-null-pointer-checks} to disable this optimization
for programs which depend on that behavior.
-Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
+Enabled at levels @option{-O3}.
@item -fexpensive-optimizations
@opindex fexpensive-optimizations
@@ -5437,7 +5453,7 @@
allowed to alias. For an example, see the C front-end function
@code{c_get_alias_set}.
-Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
+Enabled at levels @option{-O3}.
@item -fstrict-overflow
@opindex fstrict-overflow
Index: gcc-4.2.0/gcc/java/jvspec.c
===================================================================
--- gcc-4.2.0.orig/gcc/java/jvspec.c 2007-07-31 02:27:12.055259364 +0200
+++ gcc-4.2.0/gcc/java/jvspec.c 2007-07-31 02:27:39.484822490 +0200
@@ -632,6 +632,7 @@
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)
{
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