Programming Forums > Application Development > C++

rwm · Feb 21st, 2007, 2:52 AM

hey,

im trying to find docs explaining the use of -D_BOOL flag in GCC compiler...

ive downloaded the GCC docs but search for it returns nothing...

(Toggle Plain Text)

g++ -DREQUIRE_IOSTREAM -D_BOOL -DLINUX ...

none of those flags are in the docs???

any ideas??? thx!

Eoin · Feb 21st, 2007, 6:24 AM

Hi rwm, the -DNAME flags #define the preprocessor symbol NAME, for the files gcc is about to compile. So the given command line #defines the symbols _BOOL, REQUIRE_IOSTREAM and LINUX. What effects they have depends on the code being compiled.

rwm · Feb 21st, 2007, 10:21 AM

hey thx for the reply Eoin!

that makes a lot more sense now, so its basically a #define statment, so if i just included

#define BOOL

i would be able to omit the -DBOOL flag, similary for the other -D flags?

ta for help!

Eoin · Feb 21st, 2007, 12:48 PM

Exactly, but don't forget the underscore in front of the "BOOL", as that gets included too i.e -D_BOOL is effectively "#define _BOOL"

rwm · Feb 22nd, 2007, 1:41 AM

Mmm, ok I wont forget that!

Just found the -D flag in the GCC docs, well its all cool here!

Thx again!

Feb 21st, 2007, 2:52 AM	#1
rwm Professional Programmer Join Date: Jan 2007 Location: Cape Town Posts: 291 Rep Power: 2	-D_BOOL in GCC hey, im trying to find docs explaining the use of -D_BOOL flag in GCC compiler... ive downloaded the GCC docs but search for it returns nothing... (Toggle Plain Text) g++ -DREQUIRE_IOSTREAM -D_BOOL -DLINUX ... g++ -DREQUIRE_IOSTREAM -D_BOOL -DLINUX ... none of those flags are in the docs??? any ideas??? thx!

Feb 21st, 2007, 6:24 AM	#2
Eoin Hobbyist Programmer Join Date: Jun 2006 Location: Ireland Posts: 152 Rep Power: 3	Hi rwm, the -DNAME flags #define the preprocessor symbol NAME, for the files gcc is about to compile. So the given command line #defines the symbols _BOOL, REQUIRE_IOSTREAM and LINUX. What effects they have depends on the code being compiled. __________________ Visit my website BinaryNotions.

Feb 21st, 2007, 12:48 PM	#4
Eoin Hobbyist Programmer Join Date: Jun 2006 Location: Ireland Posts: 152 Rep Power: 3	Exactly, but don't forget the underscore in front of the "BOOL", as that gets included too i.e -D_BOOL is effectively "#define _BOOL" __________________ Visit my website BinaryNotions.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Feb 21st, 2007, 10:21 AM	#3
rwm Professional Programmer Join Date: Jan 2007 Location: Cape Town Posts: 291 Rep Power: 2	hey thx for the reply Eoin! that makes a lot more sense now, so its basically a #define statment, so if i just included #define BOOL i would be able to omit the -DBOOL flag, similary for the other -D flags? ta for help!

Feb 22nd, 2007, 1:41 AM	#5
rwm Professional Programmer Join Date: Jan 2007 Location: Cape Town Posts: 291 Rep Power: 2	Mmm, ok I wont forget that! Just found the -D flag in the GCC docs, well its all cool here! Thx again!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Programming Forums > Application Development > C++

-D_BOOL in GCC