Bug#220910: Please reopen
On Sat, Nov 15, 2003 at 05:40:27PM +0100, Erwan David wrote:
> Le Sat 15/11/2003, Daniel Jacobowitz disait
> > On Sat, Nov 15, 2003 at 05:13:33PM +0100, Erwan David wrote:
> > >
> > > File :
> > >
> > >
> > > /****************************************************************************
> > > * Includes. *
> > > ****************************************************************************/
> > > #include <stdlib.h>
> > > #include <stdio.h>
> > > #include <stdarg.h>
> > > #include <string.h>
> > > #include <unistd.h>
> > >
> > >
> > > /****************************************************************************
> > > * Parse the command-line arguments and store the requested configuration. *
> > > ****************************************************************************/
> > > static int ParseArgs(int argc, char *argv[])
> > > {
> > > int Option;
> > >
> > > while((Option=getopt(argc,argv,"h:lw:"))!=-1)
> > > switch(Option)
> > > {
> > > }
> > > }
> > >
> > >
> > > compilation :
> > >
> > > cc -g -ansi -pedantic -Wall -W -Wundef -Wshadow -Wpointer-arith
> > > -Wbad-function-cast -Wcast-qual -Wcast-align -Wwrite-strings
> > > -Wconversion -Wstrict-prototypes -Wmissing-prototypes
> > > -Wmissing-declarations -Wredundant-decls -Wnested-externs -Winline
> > > -DNO_EXPOSE_COMPRESSION -I/usr/include/libart-2.0/libart_lgpl/
> > > -I/usr/include/libart-2.0/ -I/usr/include/gdk-pixbuf-1.0
> > > -I/usr/include/glib-1.2 -I/usr/lib/glib/include -I/usr/X11R6/include
> > > -c -o main.o main.c
> > > main.c: In function `ParseArgs':
> > > main.c:19: warning: implicit declaration of function `getopt'
> > > main.c:23: warning: control reaches end of non-void function
> > > main.c: At top level:
> > > main.c:16: warning: `ParseArgs' defined but not used
> > >
> > >
> > > Why did getopt disappear ?
> >
> > Because you used -ansi. It's documented to turn off features that are
> > incompatible with ISO C90. From man gcc-3.3:
> >
> > The macro "__STRICT_ANSI__" is predefined when the -ansi
> > option is used. Some header files may notice this macro and
> > refrain from declaring certain functions or defining cer-
> > tain macros that the ISO standard doesn't call for; this is
> > to avoid interfering with any programs that might use these
> > names for other things.
> >
> > ISO C does not define getopt in unistd.h, so __STRICT_ANSI__ disables
> > the prototype of getopt.
>
> ISO C tells *nothing* about unistd.h sop, *all* functions non defined
> by ISO-C should be disabled. Beginning by read, write, open and close.
I do not know their reasoning. But there are no grounds to object to a
prototype being disable by -ansi since it is explicitly designed to do
so. I imagine the decision had something to do with optind/opterr, or
the number of programs that provide their own copy of getopt.
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer
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