From 91d6db7ee0006860a93d96c4c8bc58bfd8a38f6b Mon Sep 17 00:00:00 2001
From: Chris Eibl <138194463+chris-eibl@users.noreply.github.com>
Date: Mon, 10 Mar 2025 17:47:45 +0100
Subject: GH-131035: Use -flto=thin for clang-cl on Windows (GH-131036)
---
Misc/NEWS.d/next/Build/2025-03-10-10-52-25.gh-issue-131035.KF1w4j.rst | 2 ++
PCbuild/pyproject-clangcl.props | 2 +-
2 files changed, 3 insertions(+), 1 deletion(-)
create mode 100644 Misc/NEWS.d/next/Build/2025-03-10-10-52-25.gh-issue-131035.KF1w4j.rst
diff --git a/Misc/NEWS.d/next/Build/2025-03-10-10-52-25.gh-issue-131035.KF1w4j.rst b/Misc/NEWS.d/next/Build/2025-03-10-10-52-25.gh-issue-131035.KF1w4j.rst
new file mode 100644
index 0000000..43c1856
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2025-03-10-10-52-25.gh-issue-131035.KF1w4j.rst
@@ -0,0 +1,2 @@
+Use ``-flto=thin`` for faster build times using clang-cl on Windows. Patch by
+Chris Eibl.
diff --git a/PCbuild/pyproject-clangcl.props b/PCbuild/pyproject-clangcl.props
index 30db682..d949c37 100644
--- a/PCbuild/pyproject-clangcl.props
+++ b/PCbuild/pyproject-clangcl.props
@@ -41,7 +41,7 @@
-Wno-deprecated-non-prototype -Wno-unused-label -Wno-pointer-sign -Wno-incompatible-pointer-types-discards-qualifiers -Wno-unused-function %(AdditionalOptions)
-m32 %(AdditionalOptions)
-m64 %(AdditionalOptions)
- -flto %(AdditionalOptions)
+ -flto=thin %(AdditionalOptions)
-fprofile-instr-generate=$(_CLANG_PROFILE_PATH)$(TargetName)_%m.profraw %(AdditionalOptions)
-fprofile-instr-use=$(OutDir)instrumented\profdata.profdata -Wno-profile-instr-unprofiled %(AdditionalOptions)
--
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