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New clang 3.4 build can't find includes #19671

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llvmbot opened this issue Apr 1, 2014 · 11 comments
Closed

New clang 3.4 build can't find includes #19671

llvmbot opened this issue Apr 1, 2014 · 11 comments
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@sylvestre
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@llvmbot
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llvmbot commented Apr 1, 2014

Bugzilla Link 19297
Resolution FIXED
Resolved on Apr 27, 2014 01:18
Version unspecified
OS Linux
Reporter LLVM Bugzilla Contributor
CC @zygoloid,@sylvestre,@tstellar

Extended Description

I'm running Clang from inside a Docker instance running Ubuntu 12.04. Here's a tiny test case that shows the problem:

root@eacf7e43c75a:~# cat test.c

include_next <limits.h>

In file included from test.c:1:
/usr/include/limits.h:125:16: fatal error: 'limits.h' file not found

include_next <limits.h>

           ^

1 warning and 1 error generated.

root@eacf7e43c75a:# clang -v
Ubuntu clang version 3.4.1-1exp1 (branches/release_34) (based on LLVM 3.4.1)
Target: x86_64-pc-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.1
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8

However, I have a docker instance I built a couple months ago that's almost entirely the same, except for what I think is a version bump in clang-3.4:

(the following snippet is from the old image, which handles the test case fine)

root@7c57e7415f1d:# clang -v
Ubuntu clang version 3.4-1exp1 (branches/release_34) (based on LLVM 3.4)
Target: x86_64-pc-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.1
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8

Did something change in how clang looks for include files?
@llvmbot
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llvmbot commented Apr 1, 2014

assigned to @sylvestre

@llvmbot
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llvmbot commented Apr 1, 2014

Upon further digging, I believe this is due to clang expecting:

/usr/bin/../lib/clang/3.4.1/include

unfortunately, only

/usr/bin/../lib/clang/3.4/include

exists

@llvmbot
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llvmbot commented Apr 1, 2014

Even worse, there appears to be a circular symlink loop in the /usr/lib/clang directory. I'd be very grateful for adult supervision!

root@9983b8ac1abe:/usr/lib/clang# ls -al
total 12
drwxr-xr-x 3 root root 4096 Apr 1 00:02 .
drwxr-xr-x 54 root root 4096 Apr 1 00:02 ..
drwxr-xr-x 2 root root 4096 Apr 1 00:02 3.4
lrwxrwxrwx 1 root root 3 Mar 30 00:28 3.4.0 -> 3.4
root@9983b8ac1abe:/usr/lib/clang# ls -al 3.4/
total 8
drwxr-xr-x 2 root root 4096 Apr 1 00:02 .
drwxr-xr-x 3 root root 4096 Apr 1 00:02 ..
lrwxrwxrwx 1 root root 38 Mar 30 00:28 include -> ../../llvm-3.4/lib/clang/3.4.0/include
lrwxrwxrwx 1 root root 34 Mar 30 00:28 lib -> ../../llvm-3.4/lib/clang/3.4.0/lib
root@9983b8ac1abe:/usr/lib/clang#

@zygoloid
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zygoloid mannequin commented Apr 1, 2014

Where did you get your Clang 3.4.1 package from?

@llvmbot
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llvmbot commented Apr 1, 2014

Where did you get your Clang 3.4.1 package from?

From the usual apt-get repo:

deb http://llvm.org/apt/precise/ llvm-toolchain-precise-3.4 main
deb-src http://llvm.org/apt/precise/ llvm-toolchain-precise-3.4 main

apt-get install -y clang-3.4 llvm-3.4

@llvmbot
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llvmbot commented Apr 1, 2014

Ah, my mistake. The links aren't circular - they're just wrong or missing.

/usr/lib/clang/3.4.1 is not present

/usr/lib/clang/3.4.0 is present but contains
include -> /usr/lib/llvm-3.4/lib/clang/3.4.0/include, which is not present.

There is only /usr/lib/llvm-3.4/lib/clang/3.4 and /usr/lib/llvm-3.4/lib/clang/3.4.1, which contains the proper headers

Symlinking that appears to let my build succeed.

There is however, another wrinkle: /usr/lib/llvm-3.4/lib/clang/3.4/lib appears to be empty. On my "good" installation, this directory contains "linux"

@llvmbot
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llvmbot commented Apr 14, 2014

Is there an official workaround for this bug or should we just symlink until the bug is resolved?

@llvmbot
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llvmbot commented Apr 14, 2014

I've been symlinking. I haven't got any sort of official response to the bug yet.

@tstellar
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I've been symlinking. I haven't got any sort of official response to the bug
yet.

Can you try this patch:
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20140303/100882.html

@llvmbot
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llvmbot commented Apr 16, 2014

I've been symlinking. I haven't got any sort of official response to the bug
yet.

Can you try this patch:
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20140303/100882.
html

Tom, I'm not a very sophisticated user. Is there a doc I can follow about how to compile clang from source with a specified patch?

@sylvestre
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that should be fixed now.

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 9, 2021
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