Hi ROOT'ers,
As some of you may (or may not) have noticed, I recently proposed a
TException class. Though it is not the purpose of this mail to further
that discussion, I'll use it to illustrate a my problem. You can find
the source code for this class at:
http://www.fys.ku.dk/~cholm/pub/TException.tar.gz
(Note: www.fys.ku.dk is a bit unstable, so keep trying - evntually
you'll get there - sorry about that.)
My problem is this: I have an Abstract Base Class (ABC), that has a
method that takes a "va_list" argument e.g.:
#define MakeErrorString(X) va_list ap; va_start(ap,X); \
SetErrorString(X,ap); va_end(ap);
class TException : public TObject {
protected:
...
public:
...
virtual void SetErrorString(const Char_t* fmt, void* ap);
ClassDef(TException,0) // ABC Exception class for ROOT
};
And then I have some classes inheriting from this ABC, using the above
mentioned method, e.g.
class TWarning : public TException {
public:
TWarning(const Char_t* location, const Char_t* fmt, ...)
: TException(kWarning,location) { MakeErrorString(fmt); }
void* Execute(void* arg=0) { return &fExitCode; }
ClassDef(TWarning,0) // Warning exception class for ROOT
};
Each of these classes could potentially be used in an interactive ROOT
session, so I need to run "rootcint" to get the appropiate interface
functions. On Digital Unix w/EGCS 1.1.2, this works fine up until I
try to compile the source file created by "rootcint". Then the
compiler fails miserably with:
g++ -I./ -mcpu=ev5 -D__osf__ -D__alpha -I/opt/osf1/root/new/include -g -fPIC -Wall -O2 -c -o EXCEPTION_Cint.o EXCEPTION_Cint.cxx
EXCEPTION_Cint.cxx: In function `int G__TException_SetErrorString_2_0(struct G__value *, const char *, struct G__param *, int)':
EXCEPTION_Cint.cxx:162: no matching function for call to `__gnuc_va_list::$_0 (long int)'
/opt/osf1/lib/gcc-lib/alphaev56-dec-osf4.0d/egcs-2.91.66/include/va-alpha.h:22: candidates are: __gnuc_va_list::$_0(const {anonymous struct} &)
/opt/osf1/lib/gcc-lib/alphaev56-dec-osf4.0d/egcs-2.91.66/include/va-alpha.h:22: __gnuc_va_list::$_0()
It seems that the fault is in the "rootcint" generated file
"EXCEPTION_Cint.cxx" at the lines:
static int G__TException_SetErrorString_2_0(G__value *result7,
G__CONST char *funcname,
struct G__param *libp,
int hash) {
G__setnull(result7);
((TException*)(G__getstructoffset()))
->SetErrorString((const Char_t*)G__int(libp->para[0]),
(va_list)G__int(libp->para[1]));
return(1 || funcname || hash || result7 || libp) ;
}
(slightly reformated for your viewing pleasure), in particular in the
cast to "va_list" in the 8th line above.
Now, is this a limitation of ROOT/Cint (I've seen the warning in
"cint/include/stdarg.h"), and if so, is there any plans to remedy
this? If not, is it due to some error on my part, or is my code FUBAR?
Everything works nicely in a Linux Box though (2.2.12 kernel, EGCS
1.1.2, GLIBC 2.1), as you'd expect.
I'd be happy to hear any suggestions you might have. Thanks!
Christian -----------------------------------------------------------
Holm Christensen Phone: (+45) 35 35 96 91
Sankt Hansgade 23, 1. th. Office: (+45) 353 25 305
DK-2200 Copenhagen N Web: www.nbi.dk/~cholm
Denmark Email: cholm@nbi.dk
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