Experimental Physics and
Industrial Control System

Steven Hartman <[email protected]> · Fri, 19 Nov 2004 10:09:14 -0500 (EST)

On Fri, 19 Nov 2004, Singleton, SJ (Steve) wrote:

> From my tests, the problem arises as a result of compiling for a PPC-based
> IOC using:
>
> 1. The compiler supplied by Windriver to build on a Solaris host for Tornado
> 2.2.1, i.e. vxWorks 5.5.1,

Hmmm. I just tried the vxWorksBrokenCompilerTest() on my development
board. Solaris build host. Tornado 2.2.1. VxWorks 5.5.1. PPC target.

-> vxWorksBrokenCompilerTest()
Ok: bug() = 0.016667
value = 1 = 0x1
-> version
VxWorks (for Motorola MVME5110-2261 - MPC 7410) version 5.5.1.
Kernel: WIND version 2.6.
Made on Oct 21 2004, 18:16:11.

Built using typical EPICS makefiles from R3.14.6 (-O3). Relevant compile
line:

/usr/vxworks/tornado-2.2.1/ppc/host/sun4-solaris2/bin/ccppc -c
-D_POSIX_SOURCE       -DCPU=PPC604  -DvxWorks -include
/usr/vxworks/tornado-2.2.1/ppc/target/h/vxWorks.h  -ansi  -O3  -Wall
-mcpu=604 -mstrict-align -mlongcall    -fno-builtin  -I. -I..
-I../../../include/os/vxWorks -I../../../include
-I/controls/systems/epics-3.14.6/base/include/os/vxWorks
-I/controls/systems/epics-3.14.6/base/include
-I/usr/vxworks/tornado-2.2.1/ppc/target/h  ../foo.c

% /usr/vxworks/tornado-2.2.1/ppc/host/sun4-solaris2/bin/ccppc --version
gcc-2.96

However, the testgcc.c (http://ics-web1.sns.ornl.gov/share/testgcc.c) test
does print 1.0 (i.e. bug) on this same setup (-O1, -O2, or -O3). I need
to set -O0 to produce the correct response of 0.0.

It would be nice if we can produce a definitive list of compiler version,
optimization level, and architecture combinations which exhibit either of
these bugs. I have access to VxWorks compilers for 68K for VxWorks 5.3.1
(no longer in use here, but still on disk), 5.4.2 and 5.5.1, and for PPC
VxWorks 5.5.1. But I don't have target boards readily available for
testing all combinations.

These compiler bugs are rather frightening.

-- 
Steve Hartman
[email protected] || 919-660-2650
Duke Free Electron Laser Laboratory

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System