Package: gcc-snapshot Version: 20070613-1 Severity: minor
--- Please enter the report below this line. --- Using gcc-4.2 to compile with -O3 server-th.c: $ time gcc-4.2 -DHAVE_CONFIG_H -I. -I../../../clamd -I.. -I../../.. -I../../../shared -I../../../libclamav -pedantic -Wextra -Wall -Wbad-function-cast -Wcast-align -Wcast-qual -Wdisabled-optimization -Wendif-labels -Wfloat-equal -Wformat=2 -Wformat-nonliteral -Winline -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wno-unused-parameter -Wpointer-arith -Wshadow -Wstrict-prototypes -Wswitch -Wundef -Wwrite-strings -O3 -DNDEBUG -Wstack-protector -fstack-protector -D_FORTIFY_SOURCE=2 -march=k8 -mfpmath=sse -msse -msse2 -m3dnow -mmmx -MT server-th.o -MD -MP -MF ".deps/server-th.Tpo" -c -o server-th.o ../../../clamd/server-th.c real 0m0.633s user 0m0.333s sys 0m0.033s Using gcc-4.3 snapshot to compile with -O2: $ time /usr/lib/gcc-snapshot/bin/gcc -DHAVE_CONFIG_H -I. -I../../../clamd -I.. -I../../.. -I../../../shared -I../../../libclamav -pedantic -Wextra -Wall -Wbad-function-cast -Wcast-align -Wcast-qual -Wdisabled-optimization -Wendif-labels -Wfloat-equal -Wformat=2 -Wformat-nonliteral -Winline -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wno-unused-parameter -Wpointer-arith -Wshadow -Wstrict-prototypes -Wswitch -Wundef -Wwrite-strings -O2 -DNDEBUG -Wstack-protector -fstack-protector -D_FORTIFY_SOURCE=2 -march=k8 -mfpmath=sse -msse -msse2 -m3dnow -mmmx -MT server-th.o -MD -MP -MF ".deps/server-th.Tpo" -c -o server-th.o ../../../clamd/server-th.c real 0m0.822s user 0m0.721s sys 0m0.033s Using gcc-4.3 snapshot to compile with -O3: $ time /usr/lib/gcc-snapshot/bin/gcc -DHAVE_CONFIG_H -I. -I../../../clamd -I.. -I../../.. -I../../../shared -I../../../libclamav -pedantic -Wextra -Wall -Wbad-function-cast -Wcast-align -Wcast-qual -Wdisabled-optimization -Wendif-labels -Wfloat-equal -Wformat=2 -Wformat-nonliteral -Winline -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wno-unused-parameter -Wpointer-arith -Wshadow -Wstrict-prototypes -Wswitch -Wundef -Wwrite-strings -O3 -DNDEBUG -Wstack-protector -fstack-protector -D_FORTIFY_SOURCE=2 -march=k8 -mfpmath=sse -msse -msse2 -m3dnow -mmmx -MT server-th.o -MD -MP -MF ".deps/server-th.Tpo" -c -o server-th.o ../../../clamd/server-th.c Didn't finish even after 1m37s, strace shows gcc doing a bunch of mmap/munmap/brk (lots of mallocs?) However if I use -O2 -finline-functions -funswitch-loops -fgcse-after-reload -fpredictive-commoning (which according to the manpage should be equivalent), I get <1s compile time. Using 'gcc -c -Q -O2 -finline-functions -funswitch-loops -fgcse-after-reload --help=optimizers', and 'gcc -c -Q -O3 --help=optimizers' as manpage suggests gives no difference. What options does -O3 enable on gcc-4.3 that cause this slowdown in compile-time? I know that -O3 is expected to increase compile time, but this great increase in compile time compared to gcc-4.2 may hide a bug? The file I used to test can be found in the debian clamav package clamd/server-th.c, or here: http://svn.clamav.net/websvn/filedetails.php?repname=clamav-devel&path=%2Ftrunk%2Fclamd%2Fserver-th.c&rev=0&sc=0 --- System information. --- Architecture: amd64 Kernel: Linux 2.6.22-rc5-hrt1-cfs-v18-g75154f40-dirty Debian Release: lenny/sid 500 unstable www.debian-multimedia.org 500 unstable ftp.iasi.roedu.net 500 testing ftp.iasi.roedu.net 500 etch debian.beryl-project.org 1 experimental ftp.iasi.roedu.net --- Package information. --- Depends (Version) | Installed ======================================-+-==================== binutils (>= 2.17) | 2.17cvs20070426-8 libc6-dev (>= 2.3.6) | 2.5-11 libasound2 (>> 1.0.14) | 1.0.14a-1 libatk1.0-0 (>= 1.13.2) | 1.18.0-2 libc6 (>= 2.5-5) | 2.5-11 libcairo2 (>= 1.4.0) | 1.4.6-1.1 libfontconfig1 (>= 2.4.0) | 2.4.2-1.2 libfreetype6 (>= 2.2) | 2.2.1-6 libgcc1 (>= 1:4.2-20070516) | 1:4.2-20070609-1 libgcj-bc (>= 4.1.2-1) | 4.1.2-3 libglib2.0-0 (>= 2.12.9) | 2.12.12-1 libgmp3c2 | 2:4.2.1+dfsg-4 libgtk2.0-0 (>= 2.10.3) | 2.10.12-2 libice6 (>= 1:1.0.0) | 1:1.0.3-2 libjack0 (>= 0.103.0) | 0.103.0-5 libmpfr1 | 2.2.1.dfsg.1-2 libpango1.0-0 (>= 1.16.4) | 1.16.4-1 libpng12-0 (>= 1.2.13-4) | 1.2.15~beta5-2 libsm6 | 2:1.0.3-1 libstdc++6 (>= 4.2-20070516) | 4.2-20070609-1 libx11-6 | 2:1.0.3-7 libxcursor1 (>> 1.1.2) | 1:1.1.8-2 libxext6 | 1:1.0.3-2 libxfixes3 (>= 1:4.0.1) | 1:4.0.3-2 libxi6 | 1:1.0.1-4 libxinerama1 | 1:1.0.2-1 libxrandr2 (>= 2:1.2.0) | 2:1.2.1-1 libxrender1 | 1:0.9.2-1 libxtst6 | 1:1.0.2-1 zlib1g (>= 1:1.2.1) | 1:1.2.3-15 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]