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From:	"Alan Cooley" <alan AT vacooley DOT com>
To:	<cygwin AT sources DOT redhat DOT com>
Subject:	gcc - static pointer initialization problem
Date:	Thu, 7 Aug 2003 16:00:39 -0500
Message-ID:	<NDBBJGEAMLLLJFEHPBDMIEAOCIAA.alan@vacooley.com>
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Hello,

I am having a problem with a C program.  It appears that static variables
are not being initialized when in an object file.   The program compiles and
links fine but funcPtrStruct.ptr is null so program crashes.

This program works using gcc on Linux and (as I understand the C language)
should work anywhere.

Thanks in advance for any explanation/corrections you can provide.

Alan.

----------------
Files attached:
gccversion.txt - output of "gcc -v"
Makefile - 'nuf said
static_function_ptr_def.h - header for structure to hold function ptr
static_function_ptr_def.c - implementation with static initializer
static_function_ptr.c - main that invokes the function



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	name="gccversion.txt"
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Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/3.2/specs=0A=
Configured with: /netrel/src/gcc-3.2-3/configure =
--enable-languages=3Dc,c++,f77,java --enable-libgcj =
--enable-threads=3Dposix --with-system-zlib --enable-nls =
--without-included-gettext --enable-interpreter =
--disable-sjlj-exceptions --disable-version-specific-runtime-libs =
--enable-shared --build=3Di686-pc-linux --host=3Di686-pc-cygwin =
--target=3Di686-pc-cygwin --enable-haifa --prefix=3D/usr =
--exec-prefix=3D/usr --sysconfdir=3D/etc --libdir=3D/usr/lib =
--includedir=3D/nonexistent/include --libexecdir=3D/usr/sbin=0A=
Thread model: posix=0A=
gcc version 3.2 20020927 (prerelease)=0A=

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	filename="Makefile"

CFLAGS =3D -g=0A=
EXT =3D .exe=0A=
=0A=
PROGS =3D static_function_ptr$(EXT)=0A=
=0A=
all: $(PROGS)=0A=
=0A=
static_function_ptr$(EXT): static_function_ptr_def.o =
static_function_ptr.o=0A=
	$(CC) -o $@ static_function_ptr_def.o static_function_ptr.o $(LDFLAGS)=0A=
=0A=
clean:=0A=
	rm -f $(PROGS)=0A=
	rm -f *.o=0A=
	rm -f *.stackdump=0A=
=0A=
clean_editor:=0A=
	rm -f *~ *#=0A=
=0A=
clean_all: clean clean_editor=0A=
=0A=
=0A=

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	name="static_function_ptr_def.h"
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	filename="static_function_ptr_def.h"

#ifndef STATIC_FUNCTION_PTR_DEF_H=0A=
#define STATIC_FUNCTION_PTR_DEF_H=0A=
=0A=
typedef void (*myFuncPtr) ();=0A=
=0A=
typedef struct {=0A=
  myFuncPtr ptr;=0A=
} funcPtrStructDef;=0A=
=0A=
static funcPtrStructDef funcPtrStruct;=0A=
=0A=
#endif=0A=

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	filename="static_function_ptr_def.c"

#include "static_function_ptr_def.h"=0A=
=0A=
void func() {=0A=
  printf("Here I am.\n");=0A=
}=0A=
=0A=
static funcPtrStructDef funcPtrStruct =3D {func};  =0A=
=0A=

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	name="static_function_ptr.c"
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	filename="static_function_ptr.c"

/* =0A=
   Test behavior of static function pointers with gcc in Win=0A=
*/=0A=
#include <stdio.h>=0A=
#include "static_function_ptr_def.h"=0A=
=0A=
int main() {=0A=
=0A=
  printf("Try function directly...\n");=0A=
  func();=0A=
=0A=
  printf("Try function via ptr...\n");=0A=
  funcPtrStruct.ptr();=0A=
=0A=
  printf("Bye!\n");=0A=
}=0A=
=0A=
  =0A=


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