Stage 3 build fails after including system headers

[NickHastings]

Zig Version

0.10.0

Steps to Reproduce and Observed Behavior

Hi,

thanks for Zig! I've recently tried to update from Zig 0.9.1 to Zig 0.10.0.

The build fails at stage 3 after apparently including system headers that in turn include other headers that do not appear to be in the build include path. The steps taken to produce this problem were:

wget https://github.com/ziglang/zig/archive/refs/tags/0.10.0.tar.gz
tar xf 0.10.0.tar.gz
cd zig-0.10.0
mkdir build
cd build
cmake ..
make

The build fails at stage 3 after apparently including system headers that in turn include other headers that do not appear to be in the build include path. Eg I see:

Scanning dependencies of target stage3
[100%] Building stage3
Compile C Objects [11/21] analyze.cpp... error(compilation): clang failed with stderr: In file included from /home/hastings/tmp/zig-0.10.0/lib/libcxx/src/hash.cpp:9:
In file included from /home/hastings/tmp/zig-0.10.0/lib/libcxx/include/__hash_table:25:
In file included from /home/hastings/tmp/zig-0.10.0/lib/libcxx/include/memory:860:
In file included from /home/hastings/tmp/zig-0.10.0/lib/libcxx/include/__memory/shared_ptr.h:39:
In file included from /home/hastings/tmp/zig-0.10.0/lib/libcxx/include/atomic:526:
In file included from /home/hastings/tmp/zig-0.10.0/lib/libcxx/include/__thread/timed_backoff_policy.h:17:
In file included from /home/hastings/tmp/zig-0.10.0/lib/libcxx/include/__threading_support:18:
In file included from /home/hastings/tmp/zig-0.10.0/lib/libcxx/include/errno.h:31:
In file included from /usr/include/errno.h:28:
In file included from /usr/include/bits/errno.h:26:
/usr/include/linux/errno.h:1:10: fatal error: 'asm/errno.h' file not found

We can see the system header /usr/include/errno.h is included and which then includes /usr/include/bits/errno.h which in turn tries to include asm/errno.h.

Since this is stage 3 of the build I expect that no system headers should be used, only those bundled with Zig.

I have seen this on both Debian unstable (sid) and Debian stable (bullseye) with backported llvm-15.

A log from my terminal session: bullseye-zig-0.1.0-build.log.

Please let me know what additional information I could provide or what I may try in order to understand the cause of and to try to resolve this problem.

Cheers,

Nick.

Expected Behavior

I expected (hoped for!) the build to not fail.

[andrewrk]

Since this is stage 3 of the build I expect that no system headers should be used, only those bundled with Zig.

You're trying to integrate with your system-installed LLVM libraries, so system headers are included. Is the error message correct? Is /usr/include/linux/errno.h broken on your system?

[NickHastings]

Since this is stage 3 of the build I expect that no system headers should be used, only those bundled with Zig.

You're trying to integrate with your system-installed LLVM libraries,

Am I doing something wrong here? I thought that stage 3 should not be using system-installed LLVM libraries.

so system headers are included. Is the error message correct? Is /usr/include/linux/errno.h broken on your system?

As far as I know it's not broken, but I think /usr/include/x86_64-linux-gnu/ needs to be in the include path if including /usr/include/errno.h

I see this on fresh chroots of Debian stable and unstable.

[NickHastings]

It turns out that the unstable chroot I was using hadn't been updated for about 6 months. After updating it, this problem "went away". So this problem still exists on the current release of Debian but shouldn't be there for the next release.