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LFS is a project that provides you with the steps necessary to build your own custom Linux system.


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Old 07-18-2017, 02:41 PM   #1
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Error while compiling GCC 6.3.0 (LFS 8.0) on Arch Linux with GCC 7.1.0

Hello guys.

I was planning to make my own Linux From Scratch distribution.
For that I made myself an Arch Linux Virtual Machine with a virtual hard disk used for LFS, which I then copy on an USB Drive. Anyway, while compiling
GCC, at the end I got following error message:

[ALL ] /mnt/lfs/sources/gcc-6.3.0:
In function 'bool ubsan_use_new_style_p(location_t)':
[ERROR] /mnt/lfs/sources/gcc-6.3.0:
1474:23: error: ISO C++ forbids comparison between pointer and integer
[ALL ] || xloc.file == '0' || xloc.file[0] == 'xff'
[ALL ] ^~~~

I really dont get this error message.
I would really appreciate it if someone of you guys could help me.

Old 07-18-2017, 07:03 PM   #2
Keith Hedger
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post the output of the version script so we can check your host is complient
Old 07-18-2017, 08:20 PM   #3
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It looks like you're comparing pointers with text, which doesn't make sense.
Old 07-19-2017, 10:14 AM   #4
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I think line 1474 of whatever file contains the function, "bool ubsan_use_new_style_p(); may have some sort of error. It appears that there is or was line continuation and what the compiler seems to be seeing is a fragmented continuation of an existing if-test clause.
Old 07-19-2017, 01:40 PM   #5
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Most of the time you can't compile older gcc with newer one. The book specifies that a GCC version higher than one in the current book isn't supported. You can try and use gcc-6.4.0, which most likely has a patch for the issue.
Old 07-20-2017, 01:29 PM   #6
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Well, I tested GCC-7.1.0 now, it works fine.
Old 07-27-2017, 04:26 PM   #7
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I have tried building ch5 of lfs-8.0 with gcc-6.4.0 on fedora 26 and it worked for me.
Generally speaking you should not try to build a lfs toolchain that is older then the toolchain from your host.
You can boot from a livecd or use a chroot if your host is too new.


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