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From: grog@lemis.de (Greg Lehey)
Organisation: LEMIS, Schellnhausen 2, 36325 Feldatal, Germany
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	id MAA15302 for hackers@freebsd.org; Fri, 5 Jul 1996 12:11:51 +0200
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Subject: gcc lies?
To: hackers@freebsd.org (FreeBSD Hackers)
Date: Fri, 5 Jul 1996 12:11:51 +0200 (MET DST)
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I ran into a bug in gcc yesterday: certain initializers caused it to
SIGSEGV.  Before sending in a bug report, I tried it with the BSD/OS
cc, and it worked fine.  So I ported 2.7.2, and that worked fine as
well, so I decided not to file a bug report (though I do intend to try
it with the released version of 2.7.2).

So I installed 2.7.2 as my standard compiler, and hey! suddenly I get
thousands of warnings from my kernel builds.  For example,

gcc -c -O -W -Wreturn-type -Wcomment -Wredundant-decls -Wimplicit  -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes  -Winline -Wunused -g -nostdinc -I. -I../.. -I../../sys -I../../../include -DI486_CPU -DI586_CPU -DHARDFONTS -DSCSIDEBUG -DIPACCT -DCOMPAT_43 -DCD9660 -DMSDOSFS -DNFS -DFFS -DINET -DKERNEL  ../../kern/kern_descrip.c
../../kern/kern_descrip.c: In function `getdtablesize':
../../kern/kern_descrip.c:99: warning: unused parameter `uap'
../../kern/kern_descrip.c: In function `dup2':
../../kern/kern_descrip.c:127: warning: comparison between signed and unsigned
../../kern/kern_descrip.c:130: warning: comparison between signed and unsigned
../../kern/kern_descrip.c:136: warning: comparison between signed and unsigned
../../kern/kern_descrip.c:139: warning: comparison between signed and unsigned
../../kern/kern_descrip.c: In function `dup':
../../kern/kern_descrip.c:181: warning: comparison between signed and unsigned
../../kern/kern_descrip.c: In function `fcntl':
../../kern/kern_descrip.c:213: warning: comparison between signed and unsigned
../../kern/kern_descrip.c:222: warning: comparison between signed and unsigned
../../kern/kern_descrip.c: In function `close':

(that's not all, but it's enough).

If I compile the same module with the standard release gcc, I get no
warnings at all.  How come?  At first I thought it might be the header
files, but there's a -nostdinc in there, and I checked: it really does
include just the kernel header files.

Greg