Re: [lfs-support] Cross-compiling in Ch6
> On 09/01/2017 11:04 AM, Paul Rogers wrote: > > Being able to use my (now old) i7 to build (B)LFS has made this much > > faster, but seems to have tripped me up. I was trying to build an i686 > > LFS, and thought it was enough to use an older i686-made OS and > > toolchain. Works on Conroe targets, but when I actually tried a > > Pentium-3 the kernel panicked, and when trying to rebuild the kernel > > with a chroot from a real i686 OS and toolchain, make kept segfaulting. > > > > In spite of my package management wrappers, I always have followed the > > book closely, but the book presumes one will run on the same system, not > > a lower-grade member of the family. I'm guessing I'll need to use > > --host=i686-pc-linux-gnu throughout Ch6, and perhaps even a similar > > --target for binutils, GMP, MPFR, MPC, & gcc? Is that right? > > Used to be able to do various uname hacks to get around it. If kernel is > a real i686 kernel, something really simple like this: > > mv /bin/uname /bin/uname.orig > cat > /bin/uname << "EOF" > #!/bin/bash > # Begin /bin/uname > /bin/uname.orig $@ | sed 's@x86_64@i686@g' > # End /bin/uname > EOF > chmod 755 /bin/uname > > But with that said, I've no idea whether it will actually work. It used > to. Also would probably want to use march and mtune flags and probably > need to use config.fsf for gmp or explicitly set the target for that one. > > --DJ > OK, to clarify the above, I was _trying_ to make the "POD-6.1"/LFS-7.7 on the i7 for i686 by using a real i686 host "POD-4.1"/LFS-7.2. uname -a says I have an i686 kernel. The "triplet" is i686-pc-linux-gnu. But as I was following the book too closely, without --host & --target, [GMP let] some i7 instructions apparently crept into binutils and gcc, and the triplet isn't quite true. I guess what I got from Ch5 then was an i686 to i7 cross-compiler? The system *seems* to work. > > > > > clfs.org > > > > akh > Ahh, I see, I think. I need to make the i686 compiler in Ch5. And go back to hosting on POD-4.1/LFS-7.2 where --host is really what it claims. But I'm still trying to avoid doing all the work of the whole CLFS cross-build. AIUI I'll have i686 host and target, but just have to tell binutils and gcc, "No, you can't use everything you can see!" in Ch5. (Reminding me a bit of when I needed to run second-level VMs on IBM's VM/SP4 in the mid 80's. (On a dual-processor 14.7MHz 8MB 4381. How times have changed!) Confusing for a while, but finally it "clicked-in". I'm still in the confused stage now.) -- Paul Rogers paulgrog...@fastmail.fm Rogers' Second Law: "Everything you do communicates." (I do not personally endorse any additions after this line. TANSTAAFL :-) -- http://lists.linuxfromscratch.org/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page Do not top post on this list. A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? http://en.wikipedia.org/wiki/Posting_style
Re: [lfs-support] Cross-compiling in Ch6
> From: Paul Rogers > Date: Fri, 01 Sep 2017 09:04:36 -0700 > > Being able to use my (now old) i7 to build (B)LFS has made this much > faster, but seems to have tripped me up. I was trying to build an i686 > LFS, and thought it was enough to use an older i686-made OS and > toolchain. Works on Conroe targets, but when I actually tried a > Pentium-3 the kernel panicked, and when trying to rebuild the kernel > with a chroot from a real i686 OS and toolchain, make kept segfaulting. > > In spite of my package management wrappers, I always have followed the > book closely, but the book presumes one will run on the same system, not > a lower-grade member of the family. I'm guessing I'll need to use > --host=i686-pc-linux-gnu throughout Ch6, and perhaps even a similar > --target for binutils, GMP, MPFR, MPC, & gcc? Is that right? > clfs.org akh -- -- http://lists.linuxfromscratch.org/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page Do not top post on this list. A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? http://en.wikipedia.org/wiki/Posting_style
Re: [lfs-support] Cross-compiling in Ch6
On 09/01/2017 11:04 AM, Paul Rogers wrote: Being able to use my (now old) i7 to build (B)LFS has made this much faster, but seems to have tripped me up. I was trying to build an i686 LFS, and thought it was enough to use an older i686-made OS and toolchain. Works on Conroe targets, but when I actually tried a Pentium-3 the kernel panicked, and when trying to rebuild the kernel with a chroot from a real i686 OS and toolchain, make kept segfaulting. In spite of my package management wrappers, I always have followed the book closely, but the book presumes one will run on the same system, not a lower-grade member of the family. I'm guessing I'll need to use --host=i686-pc-linux-gnu throughout Ch6, and perhaps even a similar --target for binutils, GMP, MPFR, MPC, & gcc? Is that right? Used to be able to do various uname hacks to get around it. If kernel is a real i686 kernel, something really simple like this: mv /bin/uname /bin/uname.orig cat > /bin/uname << "EOF" #!/bin/bash # Begin /bin/uname /bin/uname.orig $@ | sed 's@x86_64@i686@g' # End /bin/uname EOF chmod 755 /bin/uname But with that said, I've no idea whether it will actually work. It used to. Also would probably want to use march and mtune flags and probably need to use config.fsf for gmp or explicitly set the target for that one. --DJ -- http://lists.linuxfromscratch.org/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page Do not top post on this list. A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? http://en.wikipedia.org/wiki/Posting_style
[lfs-support] Cross-compiling in Ch6
Being able to use my (now old) i7 to build (B)LFS has made this much faster, but seems to have tripped me up. I was trying to build an i686 LFS, and thought it was enough to use an older i686-made OS and toolchain. Works on Conroe targets, but when I actually tried a Pentium-3 the kernel panicked, and when trying to rebuild the kernel with a chroot from a real i686 OS and toolchain, make kept segfaulting. In spite of my package management wrappers, I always have followed the book closely, but the book presumes one will run on the same system, not a lower-grade member of the family. I'm guessing I'll need to use --host=i686-pc-linux-gnu throughout Ch6, and perhaps even a similar --target for binutils, GMP, MPFR, MPC, & gcc? Is that right? -- Paul Rogers paulgrog...@fastmail.fm Rogers' Second Law: "Everything you do communicates." (I do not personally endorse any additions after this line. TANSTAAFL :-) -- http://lists.linuxfromscratch.org/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page Do not top post on this list. A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? http://en.wikipedia.org/wiki/Posting_style
