CFLAGS Central (Part 1)

[moocha]

[orvtech]

hey can some one take a look at my CFLAGS for my pemtium-m !!!

[blueSceaDa]

i would not over-exaggerate that about the cflags, this is quite enough, will cause less errors and won't be really noticeable slower:

CFLAGS="-march=pentium-m -O2 -pipe -fomit-frame-pointer"

off-topic: maybe you then want to add something like LDFLAGS="-Wl,-O1" (this seems 100% stable, as whole ubuntu is build with them, without patches for that, afaik) ... look at the LDFLAGS Central thread
_________________
Athlon XP 2500+ @ ~2100MHz; GeForce FX 5600 256MB; 3x256MB RAM; ASUS A7N8X-X
echo 'LDFLAGS="-Wl,-O1"' >> /etc/make.conf - no problems here

[moocha]

[codergeek42]

[moocha]

Ah, perhaps it's fixed in the 4.1 line, but that line causes a lot of other stuff to break.
The problem arises because the LDFLAGS value gets taken over verbatim in mysql_config (i.e. with -Wl in front of each option, the form suitable for the gcc compiler driver) and then gets passed just like that to ld by software that souces mysql_config (and ld doesn't understand the -Wl syntax).
_________________
Military Commissions Act of 2006: http://tinyurl.com/jrcto

"Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety."
-- attributed to Benjamin Franklin

[rhill]

[darkfolk]

[moocha]

[drak]

[moocha]

Incidentally, I advise people stay away from -fnew-ra. In the majority of cases it breaks compilation or, worse yet, causes the code to behave strangely at runtime. The graph-coloring register allocator that is enabled by this flag has been dropped from GCC 4.0 since it proved to be inferior. See http://gcc.gnu.org/gcc-4.0/changes.html for more details.
_________________
Military Commissions Act of 2006: http://tinyurl.com/jrcto

"Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety."
-- attributed to Benjamin Franklin

[rm]

for info, following setting are ok8)

my system has neatly compiled with the following config:

[moocha]

rm:
Do NOT use -mfpmath=sse or -mfpmath=sse,387. SSE floating point code produced by GCC currently runs much slower than 387 FP code. GCC currently is bad at modelling more than one register set at the same time. Remove that flag and let the compiler choose defaults.
Also, get rid of -mmmx -msse -msse2. They are utterly redundant and can potentially cause trouble. Benefit of specifying them equals zero.
_________________
Military Commissions Act of 2006: http://tinyurl.com/jrcto

"Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety."
-- attributed to Benjamin Franklin

[rm]

@moocha

well those flags are not in my desktop system, I just put them in my newly installed notebook.
Next time, I rebuild world I'll remove those flags (after checking the facts once more, somewhere else , no offense meant).

thx for the info.

bye,
rm

[kimchi_sg]

My CFLAGS and CXXFLAGS:

[carpman]

Hello, are there any cflags specific to amd xp-m?

Have the 2500 512 cache version

cheers
_________________
Work Station - 64bit
Gigabyte GA X48-DQ6 Core2duo E8400
8GB GSkill DDR2-1066
SATA Areca 1210 Raid
BFG OC2 8800 GTS 640mb
--------------------------------
Notebook
Samsung Q45 7100 4gb

[nxsty]

[borkdox]

[Moartel]

Maybe this is slightly OT, but i searched the forum half an hour for informations about the ldflags (they where explained in a really good thread some time ago, but i have no bookmark ) but did not found something that helps me. Maybe someone of you still knows where they where discussed and can help me.

[borkdox]

[riogezz]

I would like to know which flags should i set for a Pentium 90 with 32 MB ram.
I set up make.conf with:
CFLAGS="-O2 -mcpu=pentium -fomit-frame-pointer -pipe"
CHOST="i586-pc-linux-gnu"
CXXFLAGS="${CFLAGS}"
USE="apache2 acpi mime fastcgi ftp gif jpeg imagemagick ipv6 ssl java python ncurses samba mysqli"

With this conf i always get errors in compiling with scripts/bootstrap.sh (compiling from stage 1).
I think it could be that maybe i set up wrong FLAGS

[nightfrost]

OK folks, I have 4 different make.conf files (make.conf, make.conf.1, make.conf.2, and make.conf.3). In addition to that I have a script in /usr/bin which I call softemerge. softemerge basically replaces make.conf with one of the other make.conf files and emerges the specified package with --oneshot. So, e.g.

[amon-ra]

My amd64 laptop's make.conf. I enble bigger optimizations in programs such as xorg. What do you think about it?

[nightfrost]

I think you definitely should remove -fPIC from your CFLAGS. Your basic idea, though, is very good I think- at least that's what I'm trying to do myself somehow

[moocha]