Experimental Physics and
Industrial Control System

Peter Zumbruch <[email protected]> · Thu, 23 Aug 2007 14:23:37 +0200

Hello Jeff,
concerning the optimization level:

The optimization -O3 had to be replaced by -Os or the
default -O0 to be able to compile.

Typically changing the optimization level has an impact only on the object

code and therefore on what is executed at runtime (we hope that -O3 will run

correctly and hopefully also more efficiently compared -O0), but does not

have an impact on whether the source code will successfully compile or not.

I am interpreting the above statement to imply that the source code wouldnât

compile successfully into object code under -O3, but given my expectations

of compilers I suspect that maybe I am suffering from a misunderstanding. So

I am curious, which was the result with -O3?

A) failure to produce object code, or

B) production of object code with runtime behavior even worse than what is

described in your mail message, or

C) You set the optimization to -O0 based on recent discussions about EPICS

R3.14.9 being incompatible with gcc 3.2.3 -O3

The cross-compiler used is a gnu-compiler provided by axis:

cris-gcc --version: cris-axis-elf-gcc (GCC) 3.2.1 Axis release R64/1.64

It is case (A):
Here the outcome of a complete make distclean && make rebuild for all levels
(I replaced the paths by <path> symbols)
Summary:
cases 1-3 fail, at the same place (not knowing the templates??)
cases 4-5 compile
1) optimization -O3:
<CROSS_COMPILER>/bin/cris-axis-linux-gnu-g++ -c
-D_POSIX_C_SOURCE=199506L -D_POSIX_THREADS -D_XOPEN_SOURCE=500 -D_cris_
-mlinux -DUNIX -D_BSD_SOURCE -Dlinux-D_REENTRANT -ansi -O3 -Wall
-mno-mul-bug-workaround -march=v10 -g -mlinux -I. -I..
-I../../../include/os/Linux -I../../../include -isystem
<CROSS_COMPILER_INCLUDE>/cris-axis-linux-gnu/include -isystem
<CROSS_COMPILER_INCLUDE>/cris-axis-linux-gnu/usr/include ../casw.cpp
In file included from ../../../include/osiWireFormat.h:265,
from ../casw.cpp:28:
../../../include/os/Linux/osdWireFormat.h:67:5: warning: #warning little
endian defined
In file included from ../udpiiu.h:49,
from ../casw.cpp:31:
../repeaterSubscribeTimer.h:41: parse error before `&' token
In file included from ../casw.cpp:31:
../udpiiu.h:260: parse error before `&' token
make[3]: *** [casw.o] Error 1
make[3]: Leaving directory
`<EPICS_HOME>/base-3.14.9/src/ca/O.linux-cris_v10'
make[2]: *** [install.linux-cris_v10] Error 2
make[2]: Leaving directory `<EPICS_HOME>/base-3.14.9/src/ca'
make[1]: *** [ca.install] Error 2
make[1]: Leaving directory `<EPICS_HOME>/base-3.14.9/src'
make: *** [src.install] Error 2
2) optimization -O2:
<CROSS_COMPILER>/bin/cris-axis-linux-gnu-g++ -c
-D_POSIX_C_SOURCE=199506L -D_POSIX_THREADS -D_XOPEN_SOURCE=500 -D_cris_
-mlinux -DUNIX -D_BSD_SOURCE -Dlinux-D_REENTRANT -ansi -O2 -Wall
-mno-mul-bug-workaround -march=v10 -g -mlinux -I. -I..
-I../../../include/os/Linux -I../../../include -isystem
<CROSS_COMPILER_INCLUDE>/cris-axis-linux-gnu/include -isystem
<CROSS_COMPILER_INCLUDE>/cris-axis-linux-gnu/usr/include ../casw.cpp
In file included from ../../../include/osiWireFormat.h:265,
from ../casw.cpp:28:
../../../include/os/Linux/osdWireFormat.h:67:5: warning: #warning little
endian defined
In file included from ../udpiiu.h:49,
from ../casw.cpp:31:
../repeaterSubscribeTimer.h:41: parse error before `&' token
In file included from ../casw.cpp:31:
../udpiiu.h:260: parse error before `&' token
make[3]: *** [casw.o] Error 1
make[3]: Leaving directory
`<EPICS_HOME>/base-3.14.9/src/ca/O.linux-cris_v10'
make[2]: *** [install.linux-cris_v10] Error 2
make[2]: Leaving directory `<EPICS_HOME>/base-3.14.9/src/ca'
make[1]: *** [ca.install] Error 2
make[1]: Leaving directory `<EPICS_HOME>/base-3.14.9/src'
make: *** [src.install] Error 2
3) optimization -O1:
<CROSS_COMPILER>/bin/cris-axis-linux-gnu-g++ -c
-D_POSIX_C_SOURCE=199506L -D_POSIX_THREADS -D_XOPEN_SOURCE=500 -D_cris_
-mlinux -DUNIX -D_BSD_SOURCE -Dlinux-D_REENTRANT -ansi -O1 -Wall
-mno-mul-bug-workaround -march=v10 -g -mlinux -I. -I..
-I../../../include/os/Linux -I../../../include -isystem
<CROSS_COMPILER_INCLUDE>/cris-axis-linux-gnu/include -isystem
<CROSS_COMPILER_INCLUDE>/cris-axis-linux-gnu/usr/include ../casw.cpp
In file included from ../../../include/osiWireFormat.h:265,
from ../casw.cpp:28:
../../../include/os/Linux/osdWireFormat.h:67:5: warning: #warning little
endian defined
In file included from ../udpiiu.h:49,
from ../casw.cpp:31:
../repeaterSubscribeTimer.h:41: parse error before `&' token
In file included from ../casw.cpp:31:
../udpiiu.h:260: parse error before `&' token
make[3]: *** [casw.o] Error 1
make[3]: Leaving directory
`<EPICS_HOME>/base-3.14.9/src/ca/O.linux-cris_v10'
make[2]: *** [install.linux-cris_v10] Error 2
make[2]: Leaving directory `<EPICS_HOME>/base-3.14.9/src/ca'
make[1]: *** [ca.install] Error 2
make[1]: Leaving directory `<EPICS_HOME>/base-3.14.9/src'
make: *** [src.install] Error 2
4) optimization -00 (no problem)
<CROSS_COMPILER>/bin/cris-axis-linux-gnu-g++ -c
-D_POSIX_C_SOURCE=199506L -D_POSIX_THREADS -D_XOPEN_SOURCE=500 -D_cris_
-mlinux -DUNIX -D_BSD_SOURCE -Dlinux-D_REENTRANT -ansi -O0 -Wall
-mno-mul-bug-workaround -march=v10 -g -mlinux -I. -I..
-I../../../include/os/Linux -I../../../include -isystem
<CROSS_COMPILER_INCLUDE>/cris-axis-linux-gnu/include -isystem
<CROSS_COMPILER_INCLUDE>/cris-axis-linux-gnu/usr/include ../casw.cpp
In file included from ../../../include/osiWireFormat.h:265,
from ../casw.cpp:28:
../../../include/os/Linux/osdWireFormat.h:67:5: warning: #warning little
endian defined
5) optimization -0s (no problem)
<CROSS_COMPILER>/bin/crisv32-axis-linux-gnu-g++ -c
-D_POSIX_C_SOURCE=199506L -D_POSIX_THREADS -D_XOPEN_SOURCE=500 -D_cris_
-mlinux -DUNIX -D_BSD_SOURCE -Dlinux -D_REENTRANT -ansi -Os -Wall
-mno-mul-bug-workaround -march=v32 -g -mlinux -I. -I..
-I../../../include/os/Linux -I../../../include -isystem
<CROSS_COMPILER_INCLUDE>/crisv32-axis-linux-gnu/include -isystem
<CROSS_COMPILER_INCLUDE>/crisv32-axis-linux-gnu/usr/include ../casw.cpp
In file included from ../../../include/osiWireFormat.h:265,
from ../casw.cpp:28:
../../../include/os/Linux/osdWireFormat.h:67:5: warning: #warning little
endian defined
A colleague stated in an earlier test:
" you cannot overload system function(fprintf) as the class method, if
you turn on -03". I haven't checked this statement yet, but take it as a
possible hint.
Best regards,
Peter
--
Dr. Peter W. Zumbruch
EE - department / Controls group / GSI
E-Mail: [email protected]
Tel: +49-(6159)-71-1435 / Fax: +49-(6159)-71-2986
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System