[llvm] [CI] Save All .ninja_log Files (PR #163485)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/163485

We currently only save the .ninja_log from the last ninja invocation because ninja overwrites any existing .ninja_log file. This prevents us from easily doing performance introspection of earlier ninja invocations (which take the bulk of the time) using the .ninja_log file.

>From 2b6db26534a690f8f3f1ac88b3b886c06be2ff73 Mon Sep 17 00:00:00 2001
From: Aiden Grossman <aidengrossman at google.com>
Date: Wed, 15 Oct 2025 01:34:04 +0000
Subject: [PATCH] [CI] Save All .ninja_log Files

We currently only save the .ninja_log from the last ninja invocation
because ninja overwrites any existing .ninja_log file. This prevents us
from easily doing performance introspection of earlier ninja invocations
(which take the bulk of the time) using the .ninja_log file.
---
 .ci/monolithic-linux.sh   | 4 ++++
 .ci/monolithic-windows.sh | 2 ++
 .ci/utils.sh              | 2 +-
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/.ci/monolithic-linux.sh b/.ci/monolithic-linux.sh
index c8f331204bd49..6460d9bf44e1b 100755
--- a/.ci/monolithic-linux.sh
+++ b/.ci/monolithic-linux.sh
@@ -66,11 +66,13 @@ start-group "ninja"
 
 # Targets are not escaped as they are passed as separate arguments.
 ninja -C "${BUILD_DIR}" -k 0 ${targets} |& tee ninja.log
+cp .ninja_log ninja.ninja_log
 
 if [[ "${runtime_targets}" != "" ]]; then
   start-group "ninja Runtimes"
 
   ninja -C "${BUILD_DIR}" ${runtime_targets} |& tee ninja_runtimes.log
+  cp .ninja_log ninja_runtimes.ninja_log
 fi
 
 # Compiling runtimes with just-built Clang and running their tests
@@ -87,6 +89,7 @@ if [[ "${runtime_targets_needs_reconfig}" != "" ]]; then
 
   ninja -C "${BUILD_DIR}" ${runtime_targets_needs_reconfig} \
     |& tee ninja_runtimes_needs_reconfig1.log
+  cp .ninja_log ninja_runtimes_needs_reconig.ninja_log
 
   start-group "CMake Runtimes Clang Modules"
 
@@ -99,4 +102,5 @@ if [[ "${runtime_targets_needs_reconfig}" != "" ]]; then
 
   ninja -C "${BUILD_DIR}" ${runtime_targets_needs_reconfig} \
     |& tee ninja_runtimes_needs_reconfig2.log
+  cp .ninja_log ninja_runtimes_needs_reconfig2.ninja_log
 fi
diff --git a/.ci/monolithic-windows.sh b/.ci/monolithic-windows.sh
index f85d6e3d51b57..0f9783dc09d8f 100755
--- a/.ci/monolithic-windows.sh
+++ b/.ci/monolithic-windows.sh
@@ -55,9 +55,11 @@ start-group "ninja"
 
 # Targets are not escaped as they are passed as separate arguments.
 ninja -C "${BUILD_DIR}" -k 0 ${targets} |& tee ninja.log
+cp .ninja_log ninja.ninja_log
 
 if [[ "${runtime_targets}" != "" ]]; then
   start-group "ninja runtimes"
   
   ninja -C "${BUILD_DIR}" -k 0 ${runtimes_targets} |& tee ninja_runtimes.log
+  cp .ninja_log ninja_runtimes.ninja_log
 fi
diff --git a/.ci/utils.sh b/.ci/utils.sh
index 5d32968babb39..1ac3e53017966 100644
--- a/.ci/utils.sh
+++ b/.ci/utils.sh
@@ -26,7 +26,7 @@ function at-exit {
   mkdir -p artifacts
   sccache --show-stats
   sccache --show-stats >> artifacts/sccache_stats.txt
-  cp "${BUILD_DIR}"/.ninja_log artifacts/.ninja_log
+  cp "${BUILD_DIR}"/*.ninja_log artifacts/ || :
   cp "${MONOREPO_ROOT}"/*.log artifacts/ || :
   cp "${BUILD_DIR}"/test-results.*.xml artifacts/ || :