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C and C++ Compilers
2-34 Copyright © 1999-2001 ARM Limited. All rights reserved. ARM DUI 0067D
struct Base { virtual void f(); };
struct Derived : Base { void f(); };
generates the following warning:
C2997W: 'Derived::f()' inherits implicit virtual from 'Base::f()'
Adding the
virtual
keyword in the derived class prevents the warning.
-Ws
This option suppresses warnings generated when the compiler inserts
padding in a
struct
. For example:
C2221W: padding inserted in struct 's'
This warning is off by default. It can be enabled with
-W+s
.
-Wt
This option suppresses the unused
this
warning. This warning is issued
when the implicit
this
argument is not used in a non-static member
function. It is applicable to C++ only. The warning can also be avoided
by making the member function a static member function. The default is
off. For example:
struct T {
int f() { return 42; }
};
results in the following warning:
C2924W: 'this' unused in non-static member function
To avoid the warning, use
static int f() ...
-Wu
For C code,
-Wu
suppresses warnings about future compatibility with
C++. Warnings are suppressed by default. You can enable them with
-W+u
.
For example:
int *new(void *p) { return p; }
results in the following warnings:
C2204W: C++ keyword used as identifier: 'new'
C2920W: implicit cast from (void *), C++ forbids
-Wv
This option suppresses warning messages of the type:
C2218W: implicit 'int' return type for 'f' - 'void' intended?
This is usually caused by a return from a function that was assumed to
return
int
, because no other type was specified, but is being used as a void
function. This is widespread in old-style C. Such action always results in
an error in C++.
-Wx
This option suppresses unused declaration warnings such as:
C2870W: variable 'y' declared but not used
- 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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Uživatelské manuály a uživatelské příručky pro Senzory Baumer FNCK 07P6910/KS35A.
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Baumer FNCK 07P6910/KS35A Uživatelský manuál (2 strany)
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