Thread: Port Bug Report: Would not build with -O2 flags set
============================================================================
POSTGRESQL BUG REPORT TEMPLATE
============================================================================
Your name : Ritch Azocar
Your email address : admin@dqu.cc.ca.us
Category : install: compile
Severity : serious
Summary: Would not build with -O2 flags set
System Configuration
--------------------
Operating System : Linux 2.2.3 ELF RedHat 5.1
PostgreSQL version : 6.4.2
Compiler used : gcc 2.7.3
Hardware:
---------
DEC Multia 21066A, 64M RAM
Versions of other tools:
------------------------
egcs 1.0.3
make 3.7.6
--------------------------------------------------------------------------
Problem Description:
--------------------
Several targets in the backend/utils/adt directory could not be built with the optimize more (-O2) flags set.
datetime.cand dt.c I'm sure about, I don't know about any others because I removed -O2 from CFLAGS in Makefile.global
andwas able to build. I don't relly care about optimum performance (I'm running on a 166MHz Alpha 21066A) so I didin't
spendthe time to compile individual targets with and without optimization. I couldn't build the ODBC interface (-O2
flagnot set) at all. I haven't tried to build it independently of the postgresql build yet. TCL & Perl worked fine.
--------------------------------------------------------------------------
Test Case:
----------
--------------------------------------------------------------------------
Solution:
---------
Turn off -O2 in CFLAGS
--------------------------------------------------------------------------
This is not a suprise, and something we have been looking at in 6.5beta. egcs does some optimization of function calls with short int parameters, and calling the adt functions through function pointers triggers a problem. Only certain platforms do this optimization. I don't think we can fix it for 6.5, but it is good to know. > > ============================================================================ > POSTGRESQL BUG REPORT TEMPLATE > ============================================================================ > > > Your name : Ritch Azocar > Your email address : admin@dqu.cc.ca.us > > Category : install: compile > Severity : serious > > Summary: Would not build with -O2 flags set > > System Configuration > -------------------- > Operating System : Linux 2.2.3 ELF RedHat 5.1 > > PostgreSQL version : 6.4.2 > > Compiler used : gcc 2.7.3 > > Hardware: > --------- > DEC Multia 21066A, 64M RAM > > Versions of other tools: > ------------------------ > egcs 1.0.3 > make 3.7.6 > > -------------------------------------------------------------------------- > > Problem Description: > -------------------- > Several targets in the backend/utils/adt directory could not be built with the optimize more (-O2) flags set. datetime.cand dt.c I'm sure about, I don't know about any others because I removed -O2 from CFLAGS in Makefile.global andwas able to build. I don't relly care about optimum performance (I'm running on a 166MHz Alpha 21066A) so I didin't spendthe time to compile individual targets with and without optimization. I couldn't build the ODBC interface (-O2 flagnot set) at all. I haven't tried to build it independently of the postgresql build yet. TCL & Perl worked fine. > > -------------------------------------------------------------------------- > > Test Case: > ---------- > > > -------------------------------------------------------------------------- > > Solution: > --------- > Turn off -O2 in CFLAGS > > -------------------------------------------------------------------------- > > > -- Bruce Momjian | http://www.op.net/~candle maillist@candle.pha.pa.us | (610) 853-3000 + If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
> This is not a suprise, and something we have been looking at in 6.5beta.
> egcs does some optimization of function calls with short int parameters,
> and calling the adt functions through function pointers triggers a
> problem.
> Only certain platforms do this optimization. I don't think we can fix
> it for 6.5, but it is good to know.
It is most likely a 64bit issue, since my RH-5.2/egcs-1.1.2 machine
does not show a problem (other than floating point funny business with
rounding).
- Thomas
> > Summary: Would not build with -O2 flags set
> > Operating System : Linux 2.2.3 ELF RedHat 5.1
> > PostgreSQL version : 6.4.2
> > Compiler used : gcc 2.7.3
> > DEC Multia 21066A, 64M RAM
> > egcs 1.0.3
> > make 3.7.6
--
Thomas Lockhart lockhart@alumni.caltech.edu
South Pasadena, California
> > This is not a suprise, and something we have been looking at in 6.5beta. > > egcs does some optimization of function calls with short int parameters, > > and calling the adt functions through function pointers triggers a > > problem. > > Only certain platforms do this optimization. I don't think we can fix > > it for 6.5, but it is good to know. > > It is most likely a 64bit issue, since my RH-5.2/egcs-1.1.2 machine > does not show a problem (other than floating point funny business with > rounding). > But hs is on an alpha. Could be very different optimizations on the different platforms, no? -- Bruce Momjian | http://www.op.net/~candle maillist@candle.pha.pa.us | (610) 853-3000 + If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
> > > Only certain platforms do this optimization. I don't think we can fix
> > > it for 6.5, but it is good to know.
> > It is most likely a 64bit issue, since my RH-5.2/egcs-1.1.2 machine
> > does not show a problem (other than floating point funny business with
> > rounding).
> But hs is on an alpha. Could be very different optimizations on the
> different platforms, no?
Sure. But gcc support for Alphas has been around for years, so imho
the most likely cause for the difference is a size issue in Postgres,
not an inability on the part of gcc to optimize code.
- Thomas
--
Thomas Lockhart lockhart@alumni.caltech.edu
South Pasadena, California
> > > > Only certain platforms do this optimization. I don't think we can fix > > > > it for 6.5, but it is good to know. > > > It is most likely a 64bit issue, since my RH-5.2/egcs-1.1.2 machine > > > does not show a problem (other than floating point funny business with > > > rounding). > > But hs is on an alpha. Could be very different optimizations on the > > different platforms, no? > > Sure. But gcc support for Alphas has been around for years, so imho > the most likely cause for the difference is a size issue in Postgres, > not an inability on the part of gcc to optimize code. But he is running egcs alpha, not gcc alpha. -- Bruce Momjian | http://www.op.net/~candle maillist@candle.pha.pa.us | (610) 853-3000 + If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
> > Sure. But gcc support for Alphas has been around for years, so
> > imho the most likely cause for the difference is a size issue in
> > Postgres, not an inability on the part of gcc to optimize code.
> But he is running egcs alpha, not gcc alpha.
*shrug* They started out as the same thing. I was guessing at the
nature of the problem; we'll see what it turns out to be...
- Thomas
--
Thomas Lockhart lockhart@alumni.caltech.edu
South Pasadena, California