1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
|
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-4.1.2/gcc/c-opts.c
===================================================================
--- gcc-4.1.2.orig/gcc/c-opts.c 2007-07-31 01:14:52.799979303 +0200
+++ gcc-4.1.2/gcc/c-opts.c 2007-07-31 01:17:10.535828420 +0200
@@ -103,6 +103,9 @@
/* 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);
@@ -448,6 +451,14 @@
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;
@@ -1121,6 +1138,47 @@
/* 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-4.1.2/gcc/c.opt
===================================================================
--- gcc-4.1.2.orig/gcc/c.opt 2007-07-31 01:14:52.807979755 +0200
+++ gcc-4.1.2/gcc/c.opt 2007-07-31 01:15:32.270228583 +0200
@@ -185,6 +185,10 @@
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
@@ -541,6 +545,9 @@
fhonor-std
C++ ObjC++
+fhonour-copts
+C ObjC C++ ObjC++ RejectNegative
+
fhosted
C ObjC
Assume normal C execution environment
Index: gcc-4.1.2/gcc/common.opt
===================================================================
--- gcc-4.1.2.orig/gcc/common.opt 2007-07-31 01:14:52.815980213 +0200
+++ gcc-4.1.2/gcc/common.opt 2007-07-31 01:17:41.997621326 +0200
@@ -77,6 +77,10 @@
Common Var(warnings_are_errors)
Treat all warnings as errors
+Werror-maybe-reset
+Common
+If environment variable GCC_NO_WERROR is set, act as -Wno-error
+
Wextra
Common
Print extra (possibly unwanted) warnings
@@ -451,6 +455,9 @@
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-4.1.2/gcc/opts.c
===================================================================
--- gcc-4.1.2.orig/gcc/opts.c 2007-07-31 01:14:52.823980670 +0200
+++ gcc-4.1.2/gcc/opts.c 2007-07-31 01:18:38.152821428 +0200
@@ -569,8 +569,6 @@
flag_schedule_insns_after_reload = 1;
#endif
flag_regmove = 1;
- flag_strict_aliasing = 1;
- flag_delete_null_pointer_checks = 1;
flag_reorder_blocks = 1;
flag_reorder_functions = 1;
flag_tree_store_ccp = 1;
@@ -586,6 +584,9 @@
if (optimize >= 3)
{
+ flag_strict_aliasing = 1;
+ flag_delete_null_pointer_checks = 1;
+
flag_inline_functions = 1;
flag_unswitch_loops = 1;
flag_gcse_after_reload = 1;
@@ -759,6 +760,17 @@
set_Wextra (value);
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-4.1.2/gcc/doc/cppopts.texi
===================================================================
--- gcc-4.1.2.orig/gcc/doc/cppopts.texi 2007-07-31 01:14:52.827980895 +0200
+++ gcc-4.1.2/gcc/doc/cppopts.texi 2007-07-31 01:15:32.362233824 +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-4.1.2/gcc/doc/invoke.texi
===================================================================
--- gcc-4.1.2.orig/gcc/doc/invoke.texi 2007-07-31 01:14:59.592366375 +0200
+++ gcc-4.1.2/gcc/doc/invoke.texi 2007-07-31 01:16:22.569094954 +0200
@@ -222,7 +222,7 @@
-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-implicit-function-declaration @gol
+-Werror -Werror-maybe-reset -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
@@ -3390,6 +3390,22 @@
@opindex Werror
Make all warnings into errors.
+@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
This option is only active when @option{-fstack-protector} is active. It
warns about functions that will not be protected against stack smashing.
@@ -4679,7 +4695,7 @@
Perform the optimizations of loop strength reduction and
elimination of iteration variables.
-Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
+Enabled at levels @option{-O3}.
@item -fthread-jumps
@opindex fthread-jumps
@@ -4826,7 +4842,7 @@
@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
@@ -5234,7 +5250,7 @@
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 -falign-functions
@itemx -falign-functions=@var{n}
Index: gcc-4.1.2/gcc/java/jvspec.c
===================================================================
--- gcc-4.1.2.orig/gcc/java/jvspec.c 2007-07-31 01:14:52.847982035 +0200
+++ gcc-4.1.2/gcc/java/jvspec.c 2007-07-31 01:15:32.454239068 +0200
@@ -620,6 +620,7 @@
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)
{
|
