libxml2 missing from --system-libs when libxml2 is enabled

[llvmbot]

Bugzilla Link	36660
Resolution	FIXED
Resolved on	Apr 06, 2018 21:28
Version	6.0
OS	Linux
Blocks	#35997
Reporter	LLVM Bugzilla Contributor
CC	@andrewrk,@zmodem
Fixed by commit(s)	r327135 r329482

Extended Description

Compiled LLVM 6.0.0 with default options for my system but only the X86 target enabled, which turns on LLVM_ENABLE_LIBXML2 because I have libxml2 installed. When linking against the resulting binaries, I get a lot of unresolved symbols that match ones exported by -lxml2.

llvm-config --link-static --system-libs returns -lz -lrt -ldl -ltinfo -lpthread -lm. I believe it should also include -lxml2.

I tried to investigate further myself, but didn't get far enough into what llvm-config does internally to figure out where the --system-libs are specified.

[zmodem]

Fix idea: https://reviews.llvm.org/D44302

[zmodem]

r327135

[andrewrk]

I don't have a link to the release blocker bug for 6.0.1. Can we get this picked into the 6.0.1 branch?

[zmodem]

Good point. Let's keep it open until it's decided about merging.

[tstellar]

Merged: r329482