#pragma
 
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

  • New to FreeBASIC

See also