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krjoseph
n00b
Joined: 08 Feb 2003
Posts: 23
Location: Nashville, Tennessee, USA
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 Posted: Wed Feb 26, 2003 8:47 pm Post subject: Stupid Noob error on install,wrong CFLAG - Can I rebuild? |
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Just getting started with Gentoo but am loving it. After years of playing with Mandrake and Red Hat I always went back to windows. I have not booted into windows in several day. Gentoo acutally makes me learn how linux works, and I have found answers and fixes to dozens of problems by searching the forums. Here is something I cannot find an answer for.
I did a stage 1 install and had my CFLAG set like this:
| Code: | | CFLAGS="-march=athlon-xp -03 -pipe" |
After stage 1, 2, and 3 (which all seemed to work) I realized the dumb mistake and the reason I was seeing warnings during compile. I used -03 instead of -O3. I now know it should have been:
| Code: | | CFLAGS="-march=athlon-xp -O3 -pipe" |
What does this -O3 mean anyway and have I totally screwed up my system? I fixed it to read -O3 after stage 3 and have installed mozilla, open office, KDE and Gnome with the correct setting in /etc/make.conf. Everything still runs faster than it ever did in RH.
Can I fix this, or do I need to? Should I rebuild the base system? If so, where do I start? Thanks. |
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BonezTheGoon
Bodhisattva
Joined: 14 Jun 2002
Posts: 1408
Location: Albuquerque, NM -- birthplace of Microsoft and Gentoo
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| Posted: Wed Feb 26, 2003 9:04 pm Post subject: |
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So long as your system is working you didn't "totally screw up" your system. The -O3 optimization is a compiler switch that indicates how much optimization should be used during compile time for the application. I believe that's what the O stands for is optimization. For more details on the GCC optimizations check this out. For processor specific options see here. And for the master list of all options see here.
I would guess (but I don't know for sure) that GCC just ignored the -03 option and compiled as though you had used
CFLAGS="-march=athlon-xp -pipe"
but in a worst case scenario I'd say that it only recognized all the options before the bad option wich would mean that it compiled as though you has used
CFLAGS="-march=athlon-xp"
Both of these obviously result in a working system, however not as optimized as it could be.
Yes you can fix this, no you don't 'need' to -- you may want to though. If you are considering rebuilding the entire system I'd argue that it might be "easiest" (which is relative to the way you approach the problem and will differ from person to person) to just start over again from scratch.
Regards,
BonezTheGoon |
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BonezTheGoon
Bodhisattva
Joined: 14 Jun 2002
Posts: 1408
Location: Albuquerque, NM -- birthplace of Microsoft and Gentoo
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| Posted: Wed Feb 26, 2003 9:07 pm Post subject: |
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Oh I should mention that all the links I posted are specific to the 3.2.2 version of GCC, which is VERY important to take note of!!
Regards,
BonezTheGoon |
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pjp
Administrator
Joined: 16 Apr 2002
Posts: 20067
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| Posted: Wed Feb 26, 2003 9:58 pm Post subject: |
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I could have sworn I've seen emerges fail because 0 (number) was used instead of O (letter). Has this changed, or does it not always fail?
Moved from Installing Gentoo.
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Quis separabit? Quo animo? |
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frogger
n00b
Joined: 05 Dec 2002
Posts: 35
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| Posted: Wed Feb 26, 2003 11:10 pm Post subject: |
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If you want to rebuild everything without starting from scratch, you can first change your CFLAGS in make.conf to what you want them to be (e.g. fix the -O3), then:
emerge glibc
emerge -e world
This will rebuild everything on your system, and you can even use it as normal while you wait  |
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