Bug 928907

Summary:	gui-libs/gtk-4.12.5: fails to compile with clang: /usr/lib/llvm/18/bin/llvm-objcopy: error: 'gtk/gtkresources_blob.o': Symbol table has link index of 5 which is not a valid index
Product:	Gentoo Linux	Reporter:	Rahul Sandhu <nvraxn>
Component:	Current packages	Assignee:	Gentoo Linux Gnome Desktop Team <gnome>
Status:	UNCONFIRMED ---
Severity:	normal	CC:	leio, llvm, lockalsash, nvraxn, sam, toolchain
Priority:	Normal
Version:	unspecified
Hardware:	AMD64
OS:	Linux
URL:	https://gitlab.gnome.org/GNOME/gtk/-/issues/6047
See Also:	https://bugs.gentoo.org/show_bug.cgi?id=915402
Whiteboard:
Package list:		Runtime testing required:	---
Bug Depends on:
Bug Blocks:	408963
Attachments:	build.log emerge --info

Description Rahul Sandhu 2024-04-07 21:22:12 UTC

gui-libs/gtk doesn't compile when using llvm 18.

Reproducible: Always

Steps to Reproduce:
1. Compile gui-libs/gtk with clang
Actual Results:  
Fails to compile

Expected Results:  
Should compile

Comment 1 Rahul Sandhu 2024-04-07 21:22:49 UTC

Created attachment 889783 [details]
build.log

Comment 2 Rahul Sandhu 2024-04-07 21:23:16 UTC

Created attachment 889784 [details]
emerge --info

Comment 3 Mart Raudsepp gentoo-dev

2024-04-13 10:09:20 UTC

I was wondering why this doesn't happen for me, but that's apparently because it only uses objcopy on x86_64 and when binutils linker is used, but I'm on arm64 and us lld:

if not meson.is_cross_build() and build_machine.cpu_family() == 'x86_64' and build_machine.system() == 'linux' and objcopy.found() and objcopy_supports_add_symbol and objcopy_supports_section_alignment and ld.fo
und() and ld_is_bfd
  can_use_objcopy_for_resources = true
else
  can_use_objcopy_for_resources = false
endif


That means I can't really reproduce this to investigate first-hand :(

Adding some CC's on who might. Those projects may feel free to un-CC themselves if they don't find it relevant.

Comment 4 Mart Raudsepp gentoo-dev

2024-04-13 10:12:47 UTC

Upstream added all these conditions to avoid this problem, apparently by ending up not using it with llvm-objcopy, but it seems to be used again now, maybe by having implemented --add-symbol and --set-section-alignment in more recent versions? But I see those options there in llvm-17 too...

Comment 5 Rahul Sandhu 2024-05-01 22:57:33 UTC

Upstream does not currently use binutils, so a workaround to compile with clang for now is to create a portage environment to use GNU objcopy:

mkdir -pv /etc/portage/{package.,}env
echo 'OBJCOPY="objcopy"' > /etc/portage/env/clang-no-llvm-objcopy # note this command will overwrite the contents of that file so ensure there is no current environment located there
echo 'gui-libs/gtk clang-no-llvm-objcopy' >> /etc/portage/package.env/gui-libs
emerge -va1 gui-libs/gtk

Comment 6 Sv. Lockal 2025-01-07 07:00:54 UTC

More discussions here: https://bugs.gentoo.org/915402

Please links both bugs to https://bugs.gentoo.org/408963 (for those who can link).