1634523 - Win32 cross builds fail with clang 10

Status: RESOLVED WORKSFORME

(Firefox Build System :: Toolchains, defect, P3)

Description

[(Away)]

Only on cross-compiled 32-bit Windows builds:

[task 2020-04-29T17:44:21.464Z] 17:44:21     INFO -       Running `/builds/worker/workspace/obj-build/release/build/osclientcerts-static-a635d25fcf6bc547/build-script-build`
[task 2020-04-29T17:44:21.465Z] 17:44:21    ERROR -  [osclientcerts-static 0.1.4] /builds/worker/checkouts/gecko/vs2017_15.8.4/SDK/include/10.0.17134.0/um/winnt.h:959:5: error: MS-style inline assembly is not available: Unable to find target for this triple (no targets are registered)

That error message comes from LLVM here. I believe this happens during cbindgen's processing of this code in osclientcerts. But I'm still trying to figure out what this error actually means...

Comment 1

[(Away)]

Well, I've figured out why I couldn't reproduce this locally before. This only happens when clang is built with -DLLVM_LINK_LLVM_DYLIB=ON, which build-clang uses.

Is clang-10-with-dynamic-libraries not linking in the backends when bindgen calls it?

Comment 2

[(Away)]

https://bugs.llvm.org/show_bug.cgi?id=45809

Comment 3

[(Away)]

Fixed in LLVM trunk 02b303321d3 and has been merged to 10.0.1.

Comment 4

[(Away)]

The fix for this is included in bug 1616692, I'll resolve when it's cleared.

Comment 5

[(Away)]

We're skipping clang 10, and clang 11 will have this fix already in it. No special action needed.