compiler-rt can't be built with glibc 2.26

[llvmbot]

Bugzilla Link	34011
Resolution	FIXED
Resolved on	Aug 23, 2017 11:08
Version	5.0
OS	Linux
Blocks	#33196
Attachments	Fix
Reporter	LLVM Bugzilla Contributor
CC	@derekbruening,@zmodem

Extended Description

glibc 2.26 (soon to be released) drops the incorrectly (non-)namespaced sigaltstack typedef and replaces it with stack_t.

compiler-rt currently uses struct sigaltstack, causing the build to fail.

Fix is tested with glibc 2.26, should be tested on older glibc versions.

[zmodem]

+Derek, maybe you can take a look?

[zmodem]

Bernhard, I took the liberty of committing your patch in r311495.

I'll merge it to 5.0 once it's been in trunk a little while.

Looking at https://github.com/lattera/glibc/blame/master/bits/sigstack.h it seems the stack_t typedef has been there forever.

[zmodem]

Merged to 5.0 in r311583