From d3f5380a6dd6fac196112b385ca6c5c2048210fa Mon Sep 17 00:00:00 2001
From: Nikita Popov <npopov@redhat.com>
Date: Fri, 25 Aug 2023 15:53:58 +0200
Subject: [PATCH] Fix brp-llvm-compile-lto-elf parallelism with hardlinks

Deduplicate the files by inode, so each hardlink is only processed
once, thus avoiding race conditions.

Resolves: rhbz#2234024
---
 brp-llvm-compile-lto-elf | 6 ++++--
 redhat-rpm-config.spec   | 7 ++++++-
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/brp-llvm-compile-lto-elf b/brp-llvm-compile-lto-elf
index 7eb53a1..37632d1 100755
--- a/brp-llvm-compile-lto-elf
+++ b/brp-llvm-compile-lto-elf
@@ -48,5 +48,7 @@ check_convert_bitcode () {
 
 echo "Checking for LLVM bitcode artifacts"
 export -f check_convert_bitcode
-find "$RPM_BUILD_ROOT" -type f -name "*.[ao]" -print0 | \
-  xargs -0 -r -n1 -P$NCPUS sh -c "check_convert_bitcode \$@ $CLANG_FLAGS" ARG0
+# Deduplicate by device:inode to avoid processing hardlinks in parallel.
+find "$RPM_BUILD_ROOT" -type f -name "*.[ao]" -printf "%d:%i %p\n" | \
+  awk "!seen[$1]++" | cut -d" " -f2- | \
+  xargs -d"\n" -r -n1 -P$NCPUS sh -c "check_convert_bitcode \$@ $CLANG_FLAGS" ARG0
diff --git a/redhat-rpm-config.spec b/redhat-rpm-config.spec
index 309e763..c5178ec 100644
--- a/redhat-rpm-config.spec
+++ b/redhat-rpm-config.spec
@@ -6,7 +6,7 @@
 
 Summary: Red Hat specific rpm configuration files
 Name: redhat-rpm-config
-Version: 201
+Version: 202
 Release: 1%{?dist}
 # No version specified.
 License: GPL+
@@ -129,6 +129,7 @@ Requires: %{_bindir}/xargs
 
 # for brp-llvm-compile-lto-elf
 Requires: (llvm if clang)
+Requires: (gawk if clang)
 
 # -fstack-clash-protection and -fcf-protection require GCC 8.
 Conflicts: gcc < 8.0.1-0.22
@@ -253,6 +254,10 @@ install -p -m 644 -t %{buildroot}%{_rpmluadir}/fedora/srpm forge.lua
 %doc buildflags.md
 
 %changelog
+* Fri Aug 25 2023 Nikita Popov <npopov@redhat.com> - 202-1
+- Fix brp-llvm-compile-lto-elf parallelism with hardlinks
+- Resolves: rhbz#2234024
+
 * Mon May 08 2023 Nikita Popov <npopov@redhat.com> - 201-1
 - Add llvm dependency if clang toolchain used
 - Resolves: rhbz#2193406