[Bug c++/12007] New: Multiple inheritance float pass by value fails

Thu Aug 21 12:30:00 GMT 2003

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12007

           Summary: Multiple inheritance float pass by value fails
           Product: gcc
           Version: 3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bill dot wade at advantica dot biz
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: hppa1.1-hp-hpux10.20
  GCC host triplet: hppa1.1-hp-hpux10.20
GCC target triplet: hppa1.1-hp-hpux10.20

When
  1) Passing a float by value to a virtual member function
  2) The actual object uses multiple inheritance with two base classes
and
  3) The member function in (1) is from the second base class
the wrong value is received in the member function.

Workarounds include changing the argument (function declaration) from float to 
double, or make the function's base class be the first base class.

The expected output of the following program is "3.14159".  I am 
seeing "0.00000"

// Reproduce putval bug with a small program

#include <stdio.h>

class gvImpl
{
public:
  virtual void PutVal(float value){}
};

class foo { public: virtual void Bar(){} };

class myGv: public foo, public gvImpl
{
  void PutVal(float value){ printf("%f\n", value); }
};

myGv x;
gvImpl* object = &x;

int main()
{
  object->PutVal(3.14159f);
  return 0;
}

Script started on Thu Aug 21 07:22:21 2003
Thu Aug 21 07:22:22 CDT 2003
sulu v940: g++ -v -save-temps mi.cpp
Reading specs from /usr/local/gcc-3.3/lib/gcc-lib/hppa1.1-hp-hpux10.20/3.3/s
pecs
Configured with: ../gcc-3.3/configure --prefix=/usr/local/gcc-3.3 --with-gnu-
as 
--with-as=/usr/local/bin/as
Thread model: single
gcc version 3.3
 /usr/local/gcc-3.3/lib/gcc-lib/hppa1.1-hp-hpux10.20/3.3/cc1plus -E -
D__GNUG__=3
 -quiet -v -D__GNUC__=3 -D__GNUC_MINOR__=3 -D__GNUC_PATCHLEVEL__=0 mi.cpp mi.ii

ignoring nonexistent directory "/usr/local/gcc-3.3/hppa1.1-hp-
hpux10.20/include"

#include "..." search starts here:
#include <...> search starts here:
 /usr/local/gcc-3.3/include/c++/3.3
 /usr/local/gcc-3.3/include/c++/3.3/hppa1.1-hp-hpux10.20
 /usr/local/gcc-3.3/include/c++/3.3/backward
 /usr/local/include
 /usr/local/gcc-3.3/include
 /usr/local/gcc-3.3/lib/gcc-lib/hppa1.1-hp-hpux10.20/3.3/include
 /usr/include
End of search list.
 /usr/local/gcc-3.3/lib/gcc-lib/hppa1.1-hp-hpux10.20/3.3/cc1plus -
fpreprocessed 
mi.ii -quiet -dumpbase mi.cpp -auxbase mi -version -o mi.s
GNU C++ version 3.3 (hppa1.1-hp-hpux10.20)
        compiled by GNU C version 3.3.
GGC heuristics: --param ggc-min-expand=42 --param ggc-min-heapsize=22528
 /usr/local/bin/as --traditional-format -o mi.o mi.s
 /usr/local/gcc-3.3/lib/gcc-lib/hppa1.1-hp-hpux10.20/3.3/collect2 -
L/lib/pa1.1 -
L/usr/lib/pa1.1 -z -u main /usr/ccs/lib/crt0.o -L/usr/local/gcc-3.3/lib/gcc-
lib/
hppa1.1-hp-hpux10.20/3.3 -L/usr/ccs/bin -L/usr/ccs/lib -L/opt/langtools/lib -
L/u
sr/local/gcc-3.3/lib mi.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
sulu v940: ./a.out
0.000000
sulu v940: gzip mi.ii
sulu v940: uuencode mi.ii.gz mi.ii.gz
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`
end
sulu v940: exit
sulu v940: 
script done on Thu Aug 21 07:23:14 2003