Date: Thu, 23 Sep 1999 13:10:48 +0200 (CEST) From: bero@ms-windows-2000.com To: FreeBSD-gnats-submit@freebsd.org Subject: kern/13917: 3.3-RELEASE kernel / gcc 2.95.1 Message-ID: <199909231110.NAA01322@data.freefilm.za.org>
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>Number: 13917 >Category: kern >Synopsis: Kernel doesn't work with gcc 2.95.1 >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: change-request >Submitter-Id: current-users >Arrival-Date: Thu Sep 23 04:20:01 PDT 1999 >Closed-Date: >Last-Modified: >Originator: Bernhard Rosenkraenzer >Release: FreeBSD 3.3-RELEASE i386 >Organization: MandrakeSoft >Environment: FreeBSD 3.3-RELEASE, ix86, gcc 2.95.1 >Description: Just tried building the kernel with gcc 2.95.1 for performance reasons (-mcpu=k6 -march=k6...). First of all, it doesn't compile because of a broken asm() construct in i386/include/bus.h, line 575: The esi and ecx are listed as clobbered despite being used for return values [and therefore being clobbered implicitly]. [Patch in Fix:] Also, I had to remove the -fformat-extensions CFLAG from bsd.kern.mk because it's obsolete. After fixing this, the kernel compiles; but trying to boot it immediately reboots the machine. The last line output by the kernel before rebooting is real memory = 83886080 (81920K bytes) Is there a known fix for compiling with gcc 2.95.1 yet? Any ideas where to start debugging the problem? >How-To-Repeat: Attempt to compile the kernel with gcc 2.95.1; used CFLAGS: -O2 -fno-strict-aliasing -mcpu=k6 -march=k6 -pipe -fno-exceptions >Fix: --- sys/i386/include/bus.h.broken Sun Aug 29 18:06:21 1999 +++ sys/i386/include/bus.h Thu Sep 23 12:13:13 1999 @@ -571,8 +571,7 @@ movb %%al,(%1) \n\ loop 1b" : "=&a" (__x) : - "r" (bsh + offset), "S" (addr), "c" (count) : - "%esi", "%ecx"); + "r" (bsh + offset), "S" (addr), "c" (count)); } #endif } >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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