Bug 831179

Summary:	media-sound/moc-2.6_alpha3-r6 fails to compile: configure: error: I dont know how to compile pthreads code on this system
Product:	Gentoo Linux	Reporter:	Agostino Sarubbo <ago>
Component:	Current packages	Assignee:	Gentoo Sound Team <sound>
Status:	CONFIRMED ---
Severity:	normal	CC:	chaseleif
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Attachments:	build.log 1-config.log Patch fixes configure error due to LLVM warning which causes error

Description Agostino Sarubbo gentoo-dev

2022-01-14 09:11:36 UTC

https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/

Issue: media-sound/moc-2.6_alpha3-r5 fails to compile.
Discovered on: amd64 (internal ref: tinderbox)

NOTE:
This machine uses CLANG as a compiler and LLD as a linker

Comment 1 Agostino Sarubbo gentoo-dev

2022-01-14 09:11:37 UTC

Created attachment 762121 [details]
build.log

build log and emerge --info

Comment 2 Agostino Sarubbo gentoo-dev

2022-01-14 09:11:38 UTC

Created attachment 762122 [details]
1-config.log

1-config.log

Comment 3 Agostino Sarubbo gentoo-dev

2023-02-26 07:44:20 UTC

tinderbox_musl has reproduced this issue with version 2.6_alpha3-r6 - Updating summary.

Comment 4 Chase 2024-03-07 02:49:38 UTC

I had this same issue,  amd64, followed steps for system-wide Clang and bootstrapped Clang toolchain.

I downloaded the MOC 2.6-alpha3 from daper.
Setting CC/CFLAGS/etc, I get: "I don't know how to compiler pthreads ..." during configure

Here is the config.log where -pthread is used with clang:
conftest.c:89:51 error: parameter 'a' set but not used [-Werror,-Wunused-but-set-parameter]
89 |  static void routine(void *a) { a = 0; }

In my make.conf, I temporarily appended to my WARNING_FLAGS (which goes into my COMMON_FLAGS then CFLAGS/etc):

WARNING_FLAGS="-Wnoerror=unused-bit-set-parameter"

I was then able to emerge media-sound/moc without any other issues.

Comment 5 Chase 2024-03-07 02:51:18 UTC

*oops, that is -Wnoerror=unused-but-set-parameter

Comment 6 Chase 2024-03-07 05:21:34 UTC

I tried to make a patch for the configure file, but the changes weren't sticking.
I've used patches for other packages.

It fixed it (in my downloaded source dir) to change the line in configure:
static void routine(void *a) { a = 0; }
to:
static void routing(void *a) { if (a) return; }

The configure script sets Werror, and, I don't know if it's new, clang warns about the unused parameter. This results in the pthread tests all failing which makes configure fail.

Comment 7 Chase 2024-04-28 03:13:40 UTC

Created attachment 891891 [details, diff]
Patch fixes configure error due to LLVM warning which causes error

More can be seen from my earlier comments, I decided to take another stab at a patch so updates can be normal. I found the correct file to fix to update the configure.

sed -i 's/static void routine(void \*a) { a = 0; }/static void routine(void \*a) { if (a) return; }/' m4/ax_pthread.m4