1# python3
2# Copyright (C) 2019 The Android Open Source Project
3#
4# Licensed under the Apache License, Version 2.0 (the "License");
5# you may not use this file except in compliance with the License.
6# You may obtain a copy of the License at
7#
8#      http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an "AS IS" BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15
16"""Warning patterns for C/C++ compiler, but not clang-tidy."""
17
18import re
19
20# pylint:disable=relative-beyond-top-level
21# pylint:disable=g-importing-member
22from .severity import Severity
23
24
25def cpp_warn(severity, description, pattern_list):
26  return {
27      'category': 'C/C++',
28      'severity': severity,
29      'description': description,
30      'patterns': pattern_list
31  }
32
33
34def fixmenow(description, pattern_list):
35  return cpp_warn(Severity.FIXMENOW, description, pattern_list)
36
37
38def high(description, pattern_list):
39  return cpp_warn(Severity.HIGH, description, pattern_list)
40
41
42def medium(description, pattern_list):
43  return cpp_warn(Severity.MEDIUM, description, pattern_list)
44
45
46def low(description, pattern_list):
47  return cpp_warn(Severity.LOW, description, pattern_list)
48
49
50def skip(description, pattern_list):
51  return cpp_warn(Severity.SKIP, description, pattern_list)
52
53
54def harmless(description, pattern_list):
55  return cpp_warn(Severity.HARMLESS, description, pattern_list)
56
57
58warn_patterns = [
59    # pylint:disable=line-too-long,g-inconsistent-quotes
60    medium('Implicit function declaration',
61           [r".*: warning: implicit declaration of function .+",
62            r".*: warning: implicitly declaring library function"]),
63    skip('skip, conflicting types for ...',
64         [r".*: warning: conflicting types for '.+'"]),
65    high('Expression always evaluates to true or false',
66         [r".*: warning: comparison is always .+ due to limited range of data type",
67          r".*: warning: comparison of unsigned .*expression .+ is always true",
68          r".*: warning: comparison of unsigned .*expression .+ is always false"]),
69    high('Use transient memory for control value',
70         [r".*: warning: .+Using such transient memory for the control value is .*dangerous."]),
71    high('Return address of stack memory',
72         [r".*: warning: Address of stack memory .+ returned to caller",
73          r".*: warning: Address of stack memory .+ will be a dangling reference"]),
74    high('Infinite recursion',
75         [r".*: warning: all paths through this function will call itself"]),
76    high('Potential buffer overflow',
77         [r".*: warning: Size argument is greater than .+ the destination buffer",
78          r".*: warning: Potential buffer overflow.",
79          r".*: warning: String copy function overflows destination buffer"]),
80    medium('Incompatible pointer types',
81           [r".*: warning: assignment from incompatible pointer type",
82            r".*: warning: return from incompatible pointer type",
83            r".*: warning: passing argument [0-9]+ of '.*' from incompatible pointer type",
84            r".*: warning: initialization from incompatible pointer type"]),
85    high('Incompatible declaration of built in function',
86         [r".*: warning: incompatible implicit declaration of built-in function .+"]),
87    high('Incompatible redeclaration of library function',
88         [r".*: warning: incompatible redeclaration of library function .+"]),
89    high('Null passed as non-null argument',
90         [r".*: warning: Null passed to a callee that requires a non-null"]),
91    medium('Unused parameter',
92           [r".*: warning: unused parameter '.*'"]),
93    medium('Unused function, variable, label, comparison, etc.',
94           [r".*: warning: '.+' defined but not used",
95            r".*: warning: unused function '.+'",
96            r".*: warning: unused label '.+'",
97            r".*: warning: relational comparison result unused",
98            r".*: warning: lambda capture .* is not used",
99            r".*: warning: private field '.+' is not used",
100            r".*: warning: unused variable '.+'"]),
101    medium('Statement with no effect or result unused',
102           [r".*: warning: statement with no effect",
103            r".*: warning: expression result unused"]),
104    medium('Ignoreing return value of function',
105           [r".*: warning: ignoring return value of function .+Wunused-result"]),
106    medium('Missing initializer',
107           [r".*: warning: missing initializer"]),
108    medium('Need virtual destructor',
109           [r".*: warning: delete called .* has virtual functions but non-virtual destructor"]),
110    skip('skip, near initialization for ...',
111         [r".*: warning: \(near initialization for '.+'\)"]),
112    medium('Expansion of data or time macro',
113           [r".*: warning: expansion of date or time macro is not reproducible"]),
114    medium('Macro expansion has undefined behavior',
115           [r".*: warning: macro expansion .* has undefined behavior"]),
116    medium('Format string does not match arguments',
117           [r".*: warning: format '.+' expects type '.+', but argument [0-9]+ has type '.+'",
118            r".*: warning: more '%' conversions than data arguments",
119            r".*: warning: data argument not used by format string",
120            r".*: warning: incomplete format specifier",
121            r".*: warning: unknown conversion type .* in format",
122            r".*: warning: format .+ expects .+ but argument .+Wformat=",
123            r".*: warning: field precision should have .+ but argument has .+Wformat",
124            r".*: warning: format specifies type .+ but the argument has .*type .+Wformat"]),
125    medium('Too many arguments for format string',
126           [r".*: warning: too many arguments for format"]),
127    medium('Too many arguments in call',
128           [r".*: warning: too many arguments in call to "]),
129    medium('Invalid format specifier',
130           [r".*: warning: invalid .+ specifier '.+'.+format-invalid-specifier"]),
131    medium('Comparison between signed and unsigned',
132           [r".*: warning: comparison between signed and unsigned",
133            r".*: warning: comparison of promoted \~unsigned with unsigned",
134            r".*: warning: signed and unsigned type in conditional expression"]),
135    medium('Comparison between enum and non-enum',
136           [r".*: warning: enumeral and non-enumeral type in conditional expression"]),
137    medium('libpng: zero area',
138           [r".*libpng warning: Ignoring attempt to set cHRM RGB triangle with zero area"]),
139    medium('Missing braces around initializer',
140           [r".*: warning: missing braces around initializer.*"]),
141    harmless('No newline at end of file',
142             [r".*: warning: no newline at end of file"]),
143    harmless('Missing space after macro name',
144             [r".*: warning: missing whitespace after the macro name"]),
145    low('Cast increases required alignment',
146        [r".*: warning: cast from .* to .* increases required alignment .*"]),
147    medium('Qualifier discarded',
148           [r".*: warning: passing argument [0-9]+ of '.+' discards qualifiers from pointer target type",
149            r".*: warning: assignment discards qualifiers from pointer target type",
150            r".*: warning: passing .+ to parameter of type .+ discards qualifiers",
151            r".*: warning: assigning to .+ from .+ discards qualifiers",
152            r".*: warning: initializing .+ discards qualifiers .+types-discards-qualifiers",
153            r".*: warning: return discards qualifiers from pointer target type"]),
154    medium('Unknown attribute',
155           [r".*: warning: unknown attribute '.+'"]),
156    medium('Attribute ignored',
157           [r".*: warning: '_*packed_*' attribute ignored",
158            r".*: warning: attribute declaration must precede definition .+ignored-attributes"]),
159    medium('Visibility problem',
160           [r".*: warning: declaration of '.+' will not be visible outside of this function"]),
161    medium('Visibility mismatch',
162           [r".*: warning: '.+' declared with greater visibility than the type of its field '.+'"]),
163    medium('Shift count greater than width of type',
164           [r".*: warning: (left|right) shift count >= width of type"]),
165    medium('extern <foo> is initialized',
166           [r".*: warning: '.+' initialized and declared 'extern'",
167            r".*: warning: 'extern' variable has an initializer"]),
168    medium('Old style declaration',
169           [r".*: warning: 'static' is not at beginning of declaration"]),
170    medium('Missing return value',
171           [r".*: warning: control reaches end of non-void function"]),
172    medium('Implicit int type',
173           [r".*: warning: type specifier missing, defaults to 'int'",
174            r".*: warning: type defaults to 'int' in declaration of '.+'"]),
175    medium('Main function should return int',
176           [r".*: warning: return type of 'main' is not 'int'"]),
177    medium('Variable may be used uninitialized',
178           [r".*: warning: '.+' may be used uninitialized in this function"]),
179    high('Variable is used uninitialized',
180         [r".*: warning: '.+' is used uninitialized in this function",
181          r".*: warning: variable '.+' is uninitialized when used here"]),
182    medium('ld: possible enum size mismatch',
183           [r".*: warning: .* uses variable-size enums yet the output is to use 32-bit enums; use of enum values across objects may fail"]),
184    medium('Pointer targets differ in signedness',
185           [r".*: warning: pointer targets in initialization differ in signedness",
186            r".*: warning: pointer targets in assignment differ in signedness",
187            r".*: warning: pointer targets in return differ in signedness",
188            r".*: warning: pointer targets in passing argument [0-9]+ of '.+' differ in signedness"]),
189    medium('Assuming overflow does not occur',
190           [r".*: warning: assuming signed overflow does not occur when assuming that .* is always (true|false)"]),
191    medium('Suggest adding braces around empty body',
192           [r".*: warning: suggest braces around empty body in an 'if' statement",
193            r".*: warning: empty body in an if-statement",
194            r".*: warning: suggest braces around empty body in an 'else' statement",
195            r".*: warning: empty body in an else-statement"]),
196    medium('Suggest adding parentheses',
197           [r".*: warning: suggest explicit braces to avoid ambiguous 'else'",
198            r".*: warning: suggest parentheses around arithmetic in operand of '.+'",
199            r".*: warning: suggest parentheses around comparison in operand of '.+'",
200            r".*: warning: logical not is only applied to the left hand side of this comparison",
201            r".*: warning: using the result of an assignment as a condition without parentheses",
202            r".*: warning: .+ has lower precedence than .+ be evaluated first .+Wparentheses",
203            r".*: warning: suggest parentheses around '.+?' .+ '.+?'",
204            r".*: warning: suggest parentheses around assignment used as truth value"]),
205    medium('Static variable used in non-static inline function',
206           [r".*: warning: '.+' is static but used in inline function '.+' which is not static"]),
207    medium('No type or storage class (will default to int)',
208           [r".*: warning: data definition has no type or storage class"]),
209    skip('skip, parameter name (without types) in function declaration',
210         [r".*: warning: parameter names \(without types\) in function declaration"]),
211    medium('Dereferencing <foo> breaks strict aliasing rules',
212           [r".*: warning: dereferencing .* break strict-aliasing rules"]),
213    medium('Cast from pointer to integer of different size',
214           [r".*: warning: cast from pointer to integer of different size",
215            r".*: warning: initialization makes pointer from integer without a cast"]),
216    medium('Cast to pointer from integer of different size',
217           [r".*: warning: cast to pointer from integer of different size"]),
218    medium('Macro redefined',
219           [r".*: warning: '.+' macro redefined"]),
220    skip('skip, ... location of the previous definition',
221         [r".*: warning: this is the location of the previous definition"]),
222    medium('ld: type and size of dynamic symbol are not defined',
223           [r".*: warning: type and size of dynamic symbol `.+' are not defined"]),
224    medium('Pointer from integer without cast',
225           [r".*: warning: assignment makes pointer from integer without a cast"]),
226    medium('Pointer from integer without cast',
227           [r".*: warning: passing argument [0-9]+ of '.+' makes pointer from integer without a cast"]),
228    medium('Integer from pointer without cast',
229           [r".*: warning: assignment makes integer from pointer without a cast"]),
230    medium('Integer from pointer without cast',
231           [r".*: warning: passing argument [0-9]+ of '.+' makes integer from pointer without a cast"]),
232    medium('Integer from pointer without cast',
233           [r".*: warning: return makes integer from pointer without a cast"]),
234    medium('Ignoring pragma',
235           [r".*: warning: ignoring #pragma .+"]),
236    medium('Pragma warning messages',
237           [r".*: warning: .+W#pragma-messages"]),
238    medium('Variable might be clobbered by longjmp or vfork',
239           [r".*: warning: variable '.+' might be clobbered by 'longjmp' or 'vfork'"]),
240    medium('Argument might be clobbered by longjmp or vfork',
241           [r".*: warning: argument '.+' might be clobbered by 'longjmp' or 'vfork'"]),
242    medium('Redundant declaration',
243           [r".*: warning: redundant redeclaration of '.+'"]),
244    skip('skip, previous declaration ... was here',
245         [r".*: warning: previous declaration of '.+' was here"]),
246    high('Enum value not handled in switch',
247         [r".*: warning: .*enumeration value.* not handled in switch.+Wswitch"]),
248    medium('User defined warnings',
249           [r".*: warning: .* \[-Wuser-defined-warnings\]$"]),
250    medium('Taking address of temporary',
251           [r".*: warning: taking address of temporary"]),
252    medium('Taking address of packed member',
253           [r".*: warning: taking address of packed member"]),
254    medium('Possible broken line continuation',
255           [r".*: warning: backslash and newline separated by space"]),
256    medium('Undefined variable template',
257           [r".*: warning: instantiation of variable .* no definition is available"]),
258    medium('Inline function is not defined',
259           [r".*: warning: inline function '.*' is not defined"]),
260    medium('Excess elements in initializer',
261           [r".*: warning: excess elements in .+ initializer"]),
262    medium('Decimal constant is unsigned only in ISO C90',
263           [r".*: warning: this decimal constant is unsigned only in ISO C90"]),
264    medium('main is usually a function',
265           [r".*: warning: 'main' is usually a function"]),
266    medium('Typedef ignored',
267           [r".*: warning: 'typedef' was ignored in this declaration"]),
268    high('Address always evaluates to true',
269         [r".*: warning: the address of '.+' will always evaluate as 'true'"]),
270    fixmenow('Freeing a non-heap object',
271             [r".*: warning: attempt to free a non-heap object '.+'"]),
272    medium('Array subscript has type char',
273           [r".*: warning: array subscript .+ type 'char'.+Wchar-subscripts"]),
274    medium('Constant too large for type',
275           [r".*: warning: integer constant is too large for '.+' type"]),
276    medium('Constant too large for type, truncated',
277           [r".*: warning: large integer implicitly truncated to unsigned type"]),
278    medium('Overflow in expression',
279           [r".*: warning: overflow in expression; .*Winteger-overflow"]),
280    medium('Overflow in implicit constant conversion',
281           [r".*: warning: overflow in implicit constant conversion"]),
282    medium('Declaration does not declare anything',
283           [r".*: warning: declaration 'class .+' does not declare anything"]),
284    medium('Initialization order will be different',
285           [r".*: warning: '.+' will be initialized after",
286            r".*: warning: field .+ will be initialized after .+Wreorder"]),
287    skip('skip,   ....',
288         [r".*: warning:   '.+'"]),
289    skip('skip,   base ...',
290         [r".*: warning:   base '.+'"]),
291    skip('skip,   when initialized here',
292         [r".*: warning:   when initialized here"]),
293    medium('Parameter type not specified',
294           [r".*: warning: type of '.+' defaults to 'int'"]),
295    medium('Missing declarations',
296           [r".*: warning: declaration does not declare anything"]),
297    medium('Missing noreturn',
298           [r".*: warning: function '.*' could be declared with attribute 'noreturn'"]),
299    medium('User warning',
300           [r".*: warning: #warning "".+"""]),
301    medium('Vexing parsing problem',
302           [r".*: warning: empty parentheses interpreted as a function declaration"]),
303    medium('Dereferencing void*',
304           [r".*: warning: dereferencing 'void \*' pointer"]),
305    medium('Comparison of pointer and integer',
306           [r".*: warning: ordered comparison of pointer with integer zero",
307            r".*: warning: .*comparison between pointer and integer"]),
308    medium('Use of error-prone unary operator',
309           [r".*: warning: use of unary operator that may be intended as compound assignment"]),
310    medium('Conversion of string constant to non-const char*',
311           [r".*: warning: deprecated conversion from string constant to '.+'"]),
312    medium('Function declaration isn''t a prototype',
313           [r".*: warning: function declaration isn't a prototype"]),
314    medium('Type qualifiers ignored on function return value',
315           [r".*: warning: type qualifiers ignored on function return type",
316            r".*: warning: .+ type qualifier .+ has no effect .+Wignored-qualifiers"]),
317    medium('<foo> declared inside parameter list, scope limited to this definition',
318           [r".*: warning: '.+' declared inside parameter list"]),
319    skip('skip, its scope is only this ...',
320         [r".*: warning: its scope is only this definition or declaration, which is probably not what you want"]),
321    low('Line continuation inside comment',
322        [r".*: warning: multi-line comment"]),
323    low('Comment inside comment',
324        [r".*: warning: '.+' within block comment .*-Wcomment"]),
325    low('Deprecated declarations',
326        [r".*: warning: .+ is deprecated.+deprecated-declarations"]),
327    low('Deprecated register',
328        [r".*: warning: 'register' storage class specifier is deprecated"]),
329    low('Converts between pointers to integer types with different sign',
330        [r".*: warning: .+ converts between pointers to integer types with different sign"]),
331    harmless('Extra tokens after #endif',
332             [r".*: warning: extra tokens at end of #endif directive"]),
333    medium('Comparison between different enums',
334           [r".*: warning: comparison between '.+' and '.+'.+Wenum-compare",
335            r".*: warning: comparison of .* enumeration types .*-Wenum-compare-switch"]),
336    medium('Conversion may change value',
337           [r".*: warning: converting negative value '.+' to '.+'",
338            r".*: warning: conversion to '.+' .+ may (alter|change)"]),
339    medium('Converting to non-pointer type from NULL',
340           [r".*: warning: converting to non-pointer type '.+' from NULL"]),
341    medium('Implicit sign conversion',
342           [r".*: warning: implicit conversion changes signedness"]),
343    medium('Converting NULL to non-pointer type',
344           [r".*: warning: implicit conversion of NULL constant to '.+'"]),
345    medium('Zero used as null pointer',
346           [r".*: warning: expression .* zero treated as a null pointer constant"]),
347    medium('Compare pointer to null character',
348           [r".*: warning: comparing a pointer to a null character constant"]),
349    medium('Implicit conversion changes value or loses precision',
350           [r".*: warning: implicit conversion .* changes value from .* to .*-conversion",
351            r".*: warning: implicit conversion loses integer precision:"]),
352    medium('Passing NULL as non-pointer argument',
353           [r".*: warning: passing NULL to non-pointer argument [0-9]+ of '.+'"]),
354    medium('Class seems unusable because of private ctor/dtor',
355           [r".*: warning: all member functions in class '.+' are private"]),
356    # skip this next one, because it only points out some RefBase-based classes
357    # where having a private destructor is perfectly fine
358    skip('Class seems unusable because of private ctor/dtor',
359         [r".*: warning: 'class .+' only defines a private destructor and has no friends"]),
360    medium('Class seems unusable because of private ctor/dtor',
361           [r".*: warning: 'class .+' only defines private constructors and has no friends"]),
362    medium('In-class initializer for static const float/double',
363           [r".*: warning: in-class initializer for static data member of .+const (float|double)"]),
364    medium('void* used in arithmetic',
365           [r".*: warning: pointer of type 'void \*' used in (arithmetic|subtraction)",
366            r".*: warning: arithmetic on .+ to void is a GNU extension.*Wpointer-arith",
367            r".*: warning: wrong type argument to increment"]),
368    medium('Overload resolution chose to promote from unsigned or enum to signed type',
369           [r".*: warning: passing '.+' chooses '.+' over '.+'.*Wsign-promo"]),
370    skip('skip,   in call to ...',
371         [r".*: warning:   in call to '.+'"]),
372    high('Base should be explicitly initialized in copy constructor',
373         [r".*: warning: base class '.+' should be explicitly initialized in the copy constructor"]),
374    medium('Return value from void function',
375           [r".*: warning: 'return' with a value, in function returning void"]),
376    medium('Multi-character character constant',
377           [r".*: warning: multi-character character constant"]),
378    medium('Conversion from string literal to char*',
379           [r".*: warning: .+ does not allow conversion from string literal to 'char \*'"]),
380    low('Extra \';\'',
381        [r".*: warning: extra ';' .+extra-semi"]),
382    low('Useless specifier',
383        [r".*: warning: useless storage class specifier in empty declaration"]),
384    low('Duplicate declaration specifier',
385        [r".*: warning: duplicate '.+' declaration specifier"]),
386    low('Comparison of self is always false',
387        [r".*: self-comparison always evaluates to false"]),
388    low('Logical op with constant operand',
389        [r".*: use of logical '.+' with constant operand"]),
390    low('Needs a space between literal and string macro',
391        [r".*: warning: invalid suffix on literal.+ requires a space .+Wliteral-suffix"]),
392    low('Warnings from #warning',
393        [r".*: warning: .+-W#warnings"]),
394    low('Using float/int absolute value function with int/float argument',
395        [r".*: warning: using .+ absolute value function .+ when argument is .+ type .+Wabsolute-value",
396         r".*: warning: absolute value function '.+' given .+ which may cause truncation .+Wabsolute-value"]),
397    low('Using C++11 extensions',
398        [r".*: warning: 'auto' type specifier is a C\+\+11 extension"]),
399    low('Refers to implicitly defined namespace',
400        [r".*: warning: using directive refers to implicitly-defined namespace .+"]),
401    low('Invalid pp token',
402        [r".*: warning: missing .+Winvalid-pp-token"]),
403    low('need glibc to link',
404        [r".*: warning: .* requires at runtime .* glibc .* for linking"]),
405    medium('Operator new returns NULL',
406           [r".*: warning: 'operator new' must not return NULL unless it is declared 'throw\(\)' .+"]),
407    medium('NULL used in arithmetic',
408           [r".*: warning: NULL used in arithmetic",
409            r".*: warning: comparison between NULL and non-pointer"]),
410    medium('Misspelled header guard',
411           [r".*: warning: '.+' is used as a header guard .+ followed by .+ different macro"]),
412    medium('Empty loop body',
413           [r".*: warning: .+ loop has empty body"]),
414    medium('Implicit conversion from enumeration type',
415           [r".*: warning: implicit conversion from enumeration type '.+'"]),
416    medium('case value not in enumerated type',
417           [r".*: warning: case value not in enumerated type '.+'"]),
418    medium('Use of deprecated method',
419           [r".*: warning: '.+' is deprecated .+"]),
420    medium('Use of garbage or uninitialized value',
421           [r".*: warning: .+ uninitialized .+\[-Wsometimes-uninitialized\]"]),
422    medium('Sizeof on array argument',
423           [r".*: warning: sizeof on array function parameter will return"]),
424    medium('Bad argument size of memory access functions',
425           [r".*: warning: .+\[-Wsizeof-pointer-memaccess\]"]),
426    medium('Return value not checked',
427           [r".*: warning: The return value from .+ is not checked"]),
428    medium('Possible heap pollution',
429           [r".*: warning: .*Possible heap pollution from .+ type .+"]),
430    medium('Variable used in loop condition not modified in loop body',
431           [r".*: warning: variable '.+' used in loop condition.*Wfor-loop-analysis"]),
432    medium('Closing a previously closed file',
433           [r".*: warning: Closing a previously closed file"]),
434    medium('Unnamed template type argument',
435           [r".*: warning: template argument.+Wunnamed-type-template-args"]),
436    medium('Unannotated fall-through between switch labels',
437           [r".*: warning: unannotated fall-through between switch labels.+Wimplicit-fallthrough"]),
438    medium('Invalid partial specialization',
439           [r".*: warning: class template partial specialization.+Winvalid-partial-specialization"]),
440    medium('Overlapping compatisons',
441           [r".*: warning: overlapping comparisons.+Wtautological-overlap-compare"]),
442    medium('int in bool context',
443           [r".*: warning: converting.+to a boolean.+Wint-in-bool-context"]),
444    medium('bitwise conditional parentheses',
445           [r".*: warning: operator.+has lower precedence.+Wbitwise-conditional-parentheses"]),
446    medium('sizeof array div',
447           [r".*: warning: .+number of elements in.+array.+Wsizeof-array-div"]),
448    medium('bool operation',
449           [r".*: warning: .+boolean.+always.+Wbool-operation"]),
450    medium('Undefined bool conversion',
451           [r".*: warning: .+may be.+always.+true.+Wundefined-bool-conversion"]),
452    medium('Typedef requires a name',
453           [r".*: warning: typedef requires a name.+Wmissing-declaration"]),
454    medium('Unknown escape sequence',
455           [r".*: warning: unknown escape sequence.+Wunknown-escape-sequence"]),
456    medium('Unicode whitespace',
457           [r".*: warning: treating Unicode.+as whitespace.+Wunicode-whitespace"]),
458    medium('Unused local typedef',
459           [r".*: warning: unused typedef.+Wunused-local-typedef"]),
460    medium('varargs warnings',
461           [r".*: warning: .*argument to 'va_start'.+\[-Wvarargs\]"]),
462    harmless('Discarded qualifier from pointer target type',
463             [r".*: warning: .+ discards '.+' qualifier from pointer target type"]),
464    harmless('Use snprintf instead of sprintf',
465             [r".*: warning: .*sprintf is often misused; please use snprintf"]),
466    harmless('Unsupported optimizaton flag',
467             [r".*: warning: optimization flag '.+' is not supported"]),
468    harmless('Extra or missing parentheses',
469             [r".*: warning: equality comparison with extraneous parentheses",
470              r".*: warning: .+ within .+Wlogical-op-parentheses"]),
471    harmless('Mismatched class vs struct tags',
472             [r".*: warning: '.+' defined as a .+ here but previously declared as a .+mismatched-tags",
473              r".*: warning: .+ was previously declared as a .+mismatched-tags"]),
474]
475
476
477def compile_patterns(patterns):
478  """Precompiling every pattern speeds up parsing by about 30x."""
479  for i in patterns:
480    i['compiled_patterns'] = []
481    for pat in i['patterns']:
482      i['compiled_patterns'].append(re.compile(pat))
483
484
485compile_patterns(warn_patterns)
486