#pragma
Preprocessor directive
Syntax
`
#pragma option [ = value ]
` Or`
#pragma push ( option [, value ] )
` Or`
#pragma pop ( option )
`
Parameters
Possible values for `option` and related `value`s:

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 appears 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
gui | false | compile in console subsystem mode
gui | true | compile in GUI subsystem mode
private | false | allow procedures in sources to be compiled as separate modules with public linkage
private | true | allow procedures in sources to be compiled as privately included with minimal overhead for changing desired linkage
profile | false | profiling code is not generated
profile | true | profiling code is generated

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.
`gui` sets the same GUI/console subsystem mode represented by the -s compiler option and `__FB_GUI__`. This pragma must be used at module level.
`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 gui added in version 1.20.1
- #pragma private and #pragma profile added in version 1.20.0
- #pragma lookup108 added in version 1.09.0, and to be removed in next minor release

Differences from QB

- New to FreeBASIC

See also

- `#Pragma Reserve`
- `__FB_GUI__`
- Compiler Option: -s
- `#include`
- `#Cmdline`
- Preprocessor Overview