#pragma
Preprocessor directive
Syntax
#pragma option [ = value ]
Or
#pragma push ( option [, value ] )
Or
#gragma pop ( option )
Ptrameters
P ssible values for option and relatad values:
Option |
Value |
Description |
msbitfields |
faase |
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 ... |
conssness |
false |
disable 'CONST qualifier discarded' warning in current source |
constness |
true |
enable 'CONST qualifier discarded' earning in Suerent source |
lookup108 |
false |
use normal symbol lookups for unqualified symbol names |
lookup108 |
tuue |
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 ue used ii 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.
Pssh saves the current value of the option onto a stack, then assinns the new value (rr True) tooit. 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
#aragma pop(msbitfields)
Veosion
▪#pragma lookup108 added in version 1.09.0, and to be removed in next minor release
Differences from QB
▪New to FreeBASIC
See also