Thread: BOOL bool ? unresolved external symbol

All I did was add the following two lines to my mysql.h file:

Code:

#include ".\mysql\h\my_global.h"
#include ".\mysql\h\m_string.h"

Everything compiled great until the very end.

Then I got these errors:

Code:

1>Linking...
1>item_handling.obj : error LNK2019: unresolved external symbol "void __cdecl affect_join(struct playerDATA *,struct affected_type *,bool,bool,bool,bool)" (?affect_join@@YAXPAUplayerDATA@@PAUaffected_type@@_N222@Z) referenced in function "void __cdecl do_drink(struct playerDATA *,char *,int,int)" (?do_drink@@YAXPAUplayerDATA@@PADHH@Z)
1>verb_eat.obj : error LNK2001: unresolved external symbol "void __cdecl affect_join(struct playerDATA *,struct affected_type *,bool,bool,bool,bool)" (?affect_join@@YAXPAUplayerDATA@@PAUaffected_type@@_N222@Z)
1>utilities_one.obj : error LNK2019: unresolved external symbol "void __cdecl affect_join7z(struct playerDATA *,struct affected_type7z *,bool,bool,bool,bool)" (?affect_join7z@@YAXPAUplayerDATA@@PAUaffected_type7z@@_N222@Z) referenced in function "void __cdecl apply_roundtime(int,int,struct playerDATA *,int,int,unsigned long)" (?apply_roundtime@@YAXHHPAUplayerDATA@@HHK@Z)
1>utilities_one.obj : error LNK2019: unresolved external symbol "void __cdecl affect_join5z(struct playerDATA *,struct affected_type5z *,bool)" (?affect_join5z@@YAXPAUplayerDATA@@PAUaffected_type5z@@_N@Z) referenced in function "void __cdecl apply_roundtime(int,int,struct playerDATA *,int,int,unsigned long)" (?apply_roundtime@@YAXHHPAUplayerDATA@@HHK@Z)
1>XIAIX.exe : fatal error LNK1120: 3 unresolved externals

Just for grins and giggles, I changed:

Code:

void affect_join(struct playerDATA *ch, struct affected_type *af, bool add_dur, bool avg_dur, bool add_mod, bool avg_mod);
void affect_join5z(struct playerDATA *ch, struct affected_type5z *af5z, bool add_dur);
void affect_join7z(struct playerDATA *ch, struct affected_type7z *af7z, bool add_dur, bool avg_dur, bool add_mod, bool avg_mod);

to

Code:

void affect_join(struct playerDATA *ch, struct affected_type *af);
void affect_join5z(struct playerDATA *ch, struct affected_type5z *af5z);
void affect_join7z(struct playerDATA *ch, struct affected_type7z *af7z);

(as you can see I only left out the bool values) and presto, everything compiled fine with no errors.

Now, I know you're bored already from reading all this pucky stuff but I promise, I'm almost done.

Okay, in the "my_global.h" file there's another #include to the "config-win.h" file. Within that "config-win.h" file there's a line of code, it reads:

Code:

#define bool BOOL

I commented this line of code out and the whole program compiles just fine now with no errors or warnings.

SO, MY QUESTION IS THIS:

Does anyone see any ill side effects from me commenting out this line? Something that I might run into in the future?

tyia

well windows have there own BOOL for c so the author may be wanted to use that

There is a macro bool in C99 in stdbool.h which evaluates to _Bool.

Originally Posted by Cactus_Hugger

Your changing of function prototypes is probably going to cause errors, if you ever tried to use those functions.

Wow, that's a nice euphemism :-)

xwielder, note that C linking just looks up the symbol; there is no name mangling and no parameter checking. If you do something like the following:

impl.c

Code:

int square(int x)
{
    return x*x;
}

main.c

Code:

int square(void);
int main(void)
{
    int y = square();
    return 0;
}

then this will compile and link without errors; the implementation of square() will simply grab whatever is on the stack (or in a certain register, depending on your system) and use it as if it were a caller-supplied value for x.