Preprocessor directive
Syntax
#pragma option [ = value ]
Or
#pragma push ( option [, value ] )
Or
#pragma pop ( option )
Parameters
Possible values for
option and related
values:
Option | Value | Description |
msbitfields | false | Use bitfields compatible with gcc (default) |
msbitfields | true | Use bitfields compatible with those used in Microsoft C compilers |
once | N/A | cause the source file in which the pragma ppears to behave as though it was included with #include once ... |
constness | false | disable 'CONST qualifier discarded' warning in current source |
constness | true | enable 'CONST qualifier discarded' warning in current source |
lookup108 | false | use normal symbol lookups for unqualified symbol names |
lookup108 | true | use fbc-1.08.x or earlier symbol lookups for unqualified symbol names |
If
value is not given, the compiler assumes
True (
-1). A zero (
0) value may be used in place of
False. A non-zero (for example,
-1) value may be used in place of
True.
Description
Allows the setting of compiler options inside the source code.
Push saves the current value of the option onto a stack, then assigns the new value (or True) to it. Pop restores the option to its previous value, and removes it from the stack. This mechanism allows options to be changed for a certain part of source code, regardless of the setting used by the context, which is especially useful inside #include header files.
constness pragma is added for testing fbc compiler. It will be removed in future at should not be relied upon.
Example
'' MSVC-compatible bitfields: save the current setting and then enable them
#pragma push(msbitfields)
'' do something that requires MS-compatible bitfields here
'' restore original setting
#pragma pop(msbitfields)
Version
- #pragma lookup108 added in version 1.09.0, and to be removed in next minor release
Differences from QB
See also