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C and C++ Compilers
ARM DUI 0067D Copyright © 1999-2001 ARM Limited. All rights reserved. 2-31
2.3.10 Controlling warning messages
The compiler issues warnings about potential portability problems and other hazards.
The compiler options enable you to turn off specific warnings. For example, you can
turn off warnings if you are in the early stages of porting a program written in old-style
C. In general, it is better to check the code than to switch off warnings.
The options are on by default, unless specified otherwise.
See also Specifying additional checks on page 2-35 for descriptions of additional
warning messages.
The general form of the
-W
compiler option is:
-W[options][+][options]
where the
options
field contains zero or more characters.
If the
+
character is included in the characters following the
-W
, the warnings
corresponding to any following letters are enabled rather than suppressed.
You can specify several options at the same time. For example:
-Wad+fg
turns off the warning messages specified by
a
and
d
, and turns on the warning messages
specified by
f
and
g
.
The warning message options are as follows:
-W
This option suppresses all warnings. If one or more letters follow the
option, only the warnings controlled by those letters are suppressed.
-Wa
This option suppresses the warning:
C2961W: Use of the assignment operator in a condition context
This warning is normally given when the compiler finds a statement such
as:
if (a = b) {...
where it is possible that one of the following is intended:
if ((a = b) != 0) {...
if (a == b) {...
-Wb
This option suppresses the warning messages that are issued for
extensions to the ANSI standard. Examples include:
• using an unwidened type in an ANSI C assignment
• specifying bitfields with a type of
char
,
short
,
long
, or
long long
- Developer Suite 1
- ARM Developer Suite 2
- Contents 3
- • Feedback on page xii 7
- About this book 8
- Preface 10
- Feedback 12
- Chapter 1 13
- Introduction 13
- 1.3 Linking compiled objects 17
- 1.4 Related utilities 18
- Chapter 2 19
- C and C++ Compilers 19
- 2.2 File usage 22
- 2.3 Command syntax 27
- Debug table format options 41
- Example 2-1 Double and float 46
- Chapter 3 57
- ARM Compiler Reference 57
- #pragma [no_]feature-name 58
- Example 3-1 Section naming 61
- Example 3-2 Pointer to packed 70
- Example 3-3 Packed structure 70
- 3.2 Language extensions 72
- Example 3-5 External access 75
- Example 3-7 Compiler error 76
- 0 1 2 3 83
- 4 5 7 8 83
- 9 10 11 12 83
- Bit number 85
- 3.4 Predefined macros 87
- Chapter 4 91
- -apcs /norwpi 95
- -apcs /rwpi 95
- The C and C++ Libraries 100
- -verbose 101
- 4.6.5 _get_lc_collate() 122
- Example 4-5 LC_COLLATE_DEF 125
- Example 4-6 LC_MONETARY_DEF 126
- Example 4-7 LC_NUMERIC_DEF 127
- 4.6.8 _get_lc_time() 128
- must return a pointer to a 128
- Example 4-9 LC_CTYPE_DEF 132
- Example 4-12 LC_TIME_DEF 134
- Example 4-13 LC_NUMERIC_DEF 136
- Example 4-14 LC_MONETARY_DEF 136
- Example 4-15 LC_INDEX_END 138
- Example 4-16 lconv structure 138
- __raise() 141
- Example 4-17 Heap_Descriptor 151
- Example 4-18 Heap_DescSize 152
- __user_libspace() 158
- __rt_stack_overflow_return 162
- __user_heap_extend() 163
- FILEHANDLE 168
- _sys_open() 168
- so that 172
- _clock_init() 175
- Mathematical functions 182
- Table 4-19 perror() messages 186
- Error Message 186
- 4.14 C library extensions 189
- Example 4-20 heapstats output 193
- -fpu none 196
- Chapter 5 199
- Floating-point Support 199
- -fpu vfp 200
- -fpu softvfp 200
- 25 22 19 18 206
- FZ RM Masks 206
- R RRR VFPVFP 206
- System ID Masks Sticky 208
- FPA onlyR R R 208
- Flag Operand type 217
- is declared in 221
- 5.4 The math library, mathlib 222
- 5.5 IEEE 754 arithmetic 228
- 63 52 5162 0 229
- Exp Frac 229
- Sample values 230
- Some sample 230
- 0x00800000 234
- 0x00400000 234
- 0x00000001 234
- Appendix A 237
- Via File Syntax 237
- A.1 Overview of via files 238
- A.2 Syntax 239
- Appendix B 241
- B.1 Implementation definition 242
- #include <stdio.h> 247
- Appendix C 249
- C.1 EC++ support 250
- C.2 Integral conversion 251
- Appendix D 257
- D.2 Internal limits 260
- Glossary 265
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