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Project > Options > C++ Compiler > Compatibility
Use this dialog box to set specific C++ compiler compatibility options.
The options on this dialog box provide backward compatibility with previous versions of the compiler. In general, these options should only be set to True
when such compatibility is required. Their default values are typically False
.
C++ Compatibility Options
C++ Compatibility Options
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Description
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Compiler support
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bcc32
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bcc32c
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bcc64
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bccosx
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bcciosarm
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bcciosarm64
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bccaarm
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'Slow' virtual base pointers
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Uses 'slow' virtual base pointers. Default = False
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Constructor displacements
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Supports constructor displacements. Default = False
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Explicit template specialization as member function
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Allow explicit template specializations as member functions. Default = False
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Old Borland class layout
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This is a backward compatibility switch that causes the C++ compiler to lay out derived classes the same way it did in older versions of Appmethod C++. Enable this option if you need to compile source files that you intend to use with older versions of Appmethod C++ (for example, if you need to work with a DLL that you cannot recompile, or if you have older data files that contain hardwired class layouts). Default = False
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Old-style class arguments
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Supports old style class arguments. Default = False
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Old-style explicit template specialization
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Allow old-style explicit template specialization. Default = False
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Old style virdef generation
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Uses old-style virdef generation. Default = False
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Push 'this' first
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Like Pascal, pushes 'this' first. The compiler typically pushes parameters on the stack from right to left. Default = False
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VC++ compatibility
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To provide compatibility with Microsoft Visual C++, substitutes __msfastcall for __fastcall calling convention. This switch should not be used when working with a VCL application. It causes numerous linker errors. Default = False
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VTable in front
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Puts virtual table pointer at front of object layout. Default = False
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Zero-length empty base class
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Usually the size of a class is at least one byte, even if the class does not define any data members. When you set this option, the compiler ignores this unused byte for the memory layout and the total size of any derived classes; empty base classes do not consume space in derived classes. Default = False
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Zero-length empty class member functions
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Usually the size of a data member in a class definition is at least one byte. When this option is enabled, the compiler allows an empty structure of zero length. Default = False
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General Options
General Options
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Description
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Compiler switches
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bcc32
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bcc32c
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bcc64
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bccosx
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bcciosarm
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bcciosarm64
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bccaarm
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Backward compatibility
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Enables all the compatibility options for backward compatibility. Default = False
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Disable lexical digraph scanner
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Disables the lexical digraph scanner. Digraphs are two character sequences that stand in for a single character that may be hard to produce on certain keyboards. If this option is true, then such diagraphs are not recognized.Default = False
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Don't collapse ref-to-ref
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Previously, a reference to a reference was illegal. The new default behavior is to follow the C++0x rules. The compiler now collapses the two references.
For example:
typedef int & intr;
typedef intrr &;
The type intrr is legal, the same type as intr under the new C++ rules. Bcc32 (Rev. 6.0 and above) follows these rules by default. Under the previous C++ rules, intrr would be illegal. If you enable the Don't collapse ref-to-ref option, intrr is reported as an error just as it previously would have been an error.
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Don't mangle calling convention
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When this option is set, the compiler disables the distinction of function names where the only possible difference is incompatible code generation options. For example, with this option set, the linker does not detect if a call is made to a __fastcall member function with the cdecl calling convention.This option is provided for backward compatibility only; it lets you link old library files that you cannot recompile. Default = False
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Enable all compatibility options
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Enables most of the compatibility options used with old code:
- 'Slow' virtual base pointers
- Old-style class arguments
- Push 'this' first
- VTable in front
- Constructor displacements
- for -statement scoping
- Zero-length empty class member functions
Default = False
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Enable new operator names
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Enables new operator names such as 'and', 'or', 'and_eq', 'bitand', and so forth. Default = False
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for -statement scoping
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Specifies the scope of variables declared in for loop expressions. The output of the following code segment changes, depending on the setting of this option:
int main(void)
{
for(int i=0; i<10; i++)
{
cout << "Inside for loop, i = " << i << endl;
} //end of for-loop block
cout << "Outside for loop, i = " << i << endl; //error without this option
} //end of block containing for loop
If this option is disabled (the default), the variable i goes out of scope when processing reaches the end of the for loop. Because of this, you will get an Undefined Symbol compilation error if you compile this code with this option disabled.
If the for -statement scoping option is enabled, the variable i goes out of scope when processing reaches the end of the block containing the for loop. In this case, the code output would be:
Inside for loop, i = 0
...
Outside for loop, i = 10
Default = False
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Global functions in segments
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Generates all global functions in their own virtual or weak segment. Default = True
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Microsoft header search algorithm
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Uses Microsoft search algorithms to locate the header files. Default = True
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Native code for MBCS
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Emits native code instead of Unicode for multi-byte character. Default = False
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Non-const calls for const object
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Allow calling a non-const member function for a const object. Default = False
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Non-const reference binding
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Allow non-const reference binding. Default = False
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Non-const string literals
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Do not treat string literals as const. Default = False
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Old 'using' rules in templates
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Use the old Borland rules for 'using' in templates. Default = False
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Old 8.3 include search
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Use old 8.3 search algorithm to locate header files. Default = False
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Old overload resolution
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Use old overload resolution rules. Default = False
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Old type rules for ternary operators
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Use the old Borland type rules for ternary operators. Default = False
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Reverse Multi-character constants
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The compiler reverses the order of Multi-character constants. Default = False
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-Vb Compiler Options for BCC32/BCCOSX
Note: Several compatibility options have compiler switches for BCC32 and BCCOSX that begin with -Vb. BCC64 does not support these compatibility options. The -Vb compatibility options are summarized in the following table:
Command-Line Switch
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Meaning
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-Va
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Support old-style class arguments.
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-Vb
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Turn on all -Vb switches. Enables backward compatibility with Bcc versions 5.8.2 and earlier.
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-Vb+
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Turn on all -Vb switches.
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-Vb-
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Turn off all -Vb switches.
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-Vb.
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Reset all -Vb switches to their default values. Available only on the command line, not in the IDE.
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-Vbc
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Do not collapse reference to reference and allow qualified references.
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-Vbe
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Allow old-style explicit template specialization.
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-Vi
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Use old 8.3 algorithm to locate header files.
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-Vbn
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Allow calling of non-const or non-volatile member function for a const or volatile object.
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-Vbo
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Use old Borland overload resolution rules.
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-Vbr
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Allow old Borland rules for reference binding.
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-Vbs
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Treat string literals as non-const.
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-Vbt
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Use old Borland type rules for ternary operators.
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-Vbu
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Use old Borland rules for using in templates.
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-Vbx
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Allow explicit template specializations as member functions.
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See Also