Date: Fri, 21 Apr 1995 17:00:44 +0200 From: Dirk Steinberg <Dirk.Steinberg@gmd.de> To: hackers@FreeBSD.org Subject: Patches to compile Kernel and Libraries with '-O3 -fomit-frame-pointer' Message-ID: <9504211500.ZM15146@tonic.gmd.de>
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Hi,
After some deadly failures I succeeded in compiling and running
FreeBSD-950417 with maximum gcc optimization: "-O3 -fomit-frame-pointer".
As for the gcc flags, this is easily accomplished by editing /etc/make.conf
for the user-level code. For the kernel itself the appropriate line in the
Makefile
containing the "COPTFLAGS" definition needs to be adapted.
Needless to say, for both the kernel and the user-land, this didn't work at
first:
/usr/libexec/ld.so fails horribly when compiled with "-fomit-frame-pointer".
I learned the hard way :-( (after compiling /bin and /sbin dynamically...).
For the kernel compile, the functions dummyinit() in in kern/init_main.c
and dummy_cleanup() in kern/kern_xxx.c get optimized away by gcc
when compiling with an optimization setting higher than "-O2", e.g.
"-O3".
The following patch fixes these problems.
Apart from these, the machine now runs happily with an uptime of
3 days...
- Dirk
PS: If I could only get a new sup from freefall... It replies to ping,
but the supfilesrv seems to have died.
diff -ur 950417/lib/csu/i386/Makefile ./lib/csu/i386/Makefile
--- 950417/lib/csu/i386/Makefile Thu Mar 30 11:09:46 1995
+++ ./lib/csu/i386/Makefile Sun Apr 23 23:36:35 1995
@@ -1,7 +1,7 @@
# from: @(#)Makefile 5.6 (Berkeley) 5/22/91
# $Id: Makefile,v 1.15 1995/03/30 06:40:31 phk Exp $
-CFLAGS+= -DLIBC_SCCS -DDYNAMIC
+CFLAGS+= -DLIBC_SCCS -DDYNAMIC -fno-omit-frame-pointer
OBJS= crt0.o gcrt0.o c++rt0.o
CLEANFILES+= a.out
MAN3+= dlopen.3
diff -ur 950417/sys/kern/init_main.c ./sys/kern/init_main.c
--- 950417/sys/kern/init_main.c Mon Apr 10 22:20:26 1995
+++ ./sys/kern/init_main.c Mon Apr 17 19:54:21 1995
@@ -110,7 +110,7 @@
* called to initialize various pseudo-devices and whatnot.
*/
-static void dummyinit() {}
+void dummyinit() {}
TEXT_SET(pseudo_set, dummyinit);
typedef void (*pseudo_func_t)(void);
diff -ur 950417/sys/kern/kern_xxx.c ./sys/kern/kern_xxx.c
--- 950417/sys/kern/kern_xxx.c Sun Dec 4 20:58:43 1994
+++ ./sys/kern/kern_xxx.c Mon Apr 17 19:53:16 1995
@@ -46,7 +46,7 @@
/* This implements a "TEXT_SET" for cleanup functions */
-static void
+void
dummy_cleanup() {}
TEXT_SET(cleanup_set, dummy_cleanup);
------------ snip, snip -----------------
--
------------------------------------------------------------------------------
Dirk W. Steinberg - German National Research Center for Computer Science (GMD)
Institute for Application-Oriented Software- and Systems Technology (ISA-NW)
Network Engineering Department - Rathausallee 10 - D-53754 Sankt Augustin
Phone: +49 2241 14-3182 - Fax: +49 2241 14-3038 - Email: Dirk.Steinberg@gmd.de
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