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From: jimb@occs.cs.oberlin.edu
Newsgroups: gnu.gcc.bug
Subject: -nostdlib seems to inhibit gnulib linking
Message-ID: <9002210815.AA16258@occs.cs.oberlin.edu>
Date: 21 Feb 90 08:15:35 GMT
Sender: daemon@tut.cis.ohio-state.edu
Distribution: gnu
Organization: GNUs Not Usenet
Lines: 93

I believe there is a bug regarding the -nostdlib option in gcc version
1.36.  The documentation for this option:

`-nostdlib'
     Don't use the standard system libraries and startup files when
     linking.  Only the files you specify (plus `gnulib') will be
     passed to the linker.

I read this to mean that gcc links with gnulib whether -nostdlib is
specified or not.  However, gcc does not seem to include gnulib when
the -nostdlib option is given.  An annotated transcript, on a Sun 3/60
running SunOS Release 4.0:


betty% ls -l tm.h md
lrwxrwxrwx  1 gnusoft        16 Feb 20 23:09 md -> ./config/m68k.md
lrwxrwxrwx  1 gnusoft        18 Feb 20 23:09 tm.h -> ./config/tm-sun3.h
betty% 


These are the linkages for md and tm.h.


betty% cat foo.c
main(int x)
{
	return (x-1)/x;
}
betty% 


This is a sample program that exacerbates the bug.  Note that these
ints are 32 bits, so this will require 32-bit division.


betty% ./gcc -v -m68000 -nostdlib -e _main foo.c -o foo
gcc version 1.36
 /usr/users/software/gnusoft/lib/gcc-cpp -v -undef -D__GNUC__ -Dmc68000 -Dsun -Dunix -D__mc68000__ -D__sun__ -D__unix__ -D__HAVE_68881__ -Dmc68010 foo.c /usr/tmp/cca12192.cpp
GNU CPP version 1.36
 /usr/users/software/gnusoft/lib/gcc-cc1 /usr/tmp/cca12192.cpp -quiet -dumpbase foo.c -m68000 -version -o /usr/tmp/cca12192.s
GNU C version 1.36 (68k, MIT syntax) compiled by GNU C version 1.36.
default target switches: -m68020 -mc68020 -m68881 -mbitfield
 as -mc68010 -o foo.o /usr/tmp/cca12192.s
 ld -o foo -dc -dp -e _main foo.o
Undefined:
___divsi3
betty% 


I am using GCC to compile for a 68010.  When compiled with the -m68000
flag, gcc generates a call to the gnulib division function, but
doesn't seem to link with gnulib.


betty% ./gcc -v -m68000 -e _main foo.c -o foo
gcc version 1.36
 /usr/users/software/gnusoft/lib/gcc-cpp -v -undef -D__GNUC__ -Dmc68000 -Dsun -Dunix -D__mc68000__ -D__sun__ -D__unix__ -D__HAVE_68881__ -Dmc68010 foo.c /usr/tmp/cca12197.cpp
GNU CPP version 1.36
 /usr/users/software/gnusoft/lib/gcc-cc1 /usr/tmp/cca12197.cpp -quiet -dumpbase foo.c -m68000 -version -o /usr/tmp/cca12197.s
GNU C version 1.36 (68k, MIT syntax) compiled by GNU C version 1.36.
default target switches: -m68020 -mc68020 -m68881 -mbitfield
 as -mc68010 -o foo.o /usr/tmp/cca12197.s
 ld -o foo -dc -dp -e _main /lib/crt0.o /lib/Mcrt1.o foo.o /usr/users/software/gnusoft/lib/gcc-gnulib -lc
betty% 


Without the -nostdlib option, things compile fine, so it *is* finding
gnulib normally.


betty% gcc -v -m68000 -nostdlib -e _main foo.c ~gnusoft/lib/gcc-gnulib -o foo
gcc version 1.36
 /usr/users/software/gnusoft/lib/gcc-cpp -v -undef -D__GNUC__ -Dmc68000 -Dsun -Dunix -D__mc68000__ -D__sun__ -D__unix__ -D__HAVE_68881__ -Dmc68010 foo.c /usr/tmp/cca12202.cpp
GNU CPP version 1.36
 /usr/users/software/gnusoft/lib/gcc-cc1 /usr/tmp/cca12202.cpp -quiet -dumpbase foo.c -m68000 -version -o /usr/tmp/cca12202.s
GNU C version 1.36 (68k, MIT syntax) compiled by GNU C version 1.36.
default target switches: -m68020 -mc68020 -m68881 -mbitfield
 as -mc68010 -o foo.o /usr/tmp/cca12202.s
 ld -o foo -dc -dp -e _main foo.o /usr/users/software/gnusoft/lib/gcc-gnulib
betty% ls ~gnusoft/lib
bison.hairy	dump.h		gcc-cpp*	gcc-include/
bison.simple	gcc-cc1*	gcc-gnulib*	window.h
betty% 

	
When one explicitly specifies gnulib with -nostdlib, things work fine.

It seems to me that this is a case of gcc not performing as
documented.

Otherwise, GCC is a pleasure to use.

Jim Blandy - jimb@occs.cs.oberlin.edu