Unable to build on Power9 with 12.0.0-rc1

[llvmbot]

Bugzilla Link	48990
Resolution	FIXED
Resolved on	Aug 05, 2021 08:12
Version	unspecified
OS	All
Blocks	#48661
Attachments	Build log for Power9 Ubuntu
Reporter	LLVM Bugzilla Contributor
CC	@tstellar

Extended Description

Building 12.0.0-rc1, stage 2 on Power9 with RHEL and Ubuntu produces the following (and similar errors, see attachment):

/home/conanap/12rc1/stage2/build/include/c++/v1/math.h:463:12: error: expected '(' for function-style cast or type construction
return isinf(__lcpp_x);
^~~~~~~~~~~~~~~
/usr/include/math.h:661:20: note: expanded from macro 'isinf'

define isinf(x) __MATH_TG ((x), __isinf, (x))

               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

/usr/include/math.h:546:54: note: expanded from macro '__MATH_TG'
(__builtin_types_compatible_p (__typeof (TG_ARG), float),
...

[llvmbot]

The error seems to stem from the commit that enabled Float128 by default on Power9 when built without shared libraries: https://github.ibm.com/compiler/llvm-project/commit/6bf29dbb1541aff717e52b5c5fb12b84f5b38f21

[llvmbot]

Apologies that was a link to the private repo. This is the correct commit on the public repo: 6bf29db

I'm currently communicating with the author to continue debugging the issue.

[tstellar]

This bug was not resolved in time for the 12.0.0 release, so it will have to wait for 12.0.1.

If you feel this is a high-priority bug that should be fixed for 12.0.0, please re-add release-12.0.0 to the Blocks field and add a comment explaining why this is high-priority.

[tstellar]

Is this bug still present in llvm 12.0.1-rc1?

[llvmbot]

This is fixed with 12.0.1

[llvmbot]

mentioned in issue llvm/llvm-bugzilla-archive#49058

[tstellar]

mentioned in issue #48661