From: Chris Eibl <138194463+chris-eibl@users.noreply.github.com>
Date: Mon, 10 Mar 2025 16:47:45 +0000 (+0100)
Subject: GH-131035: Use -flto=thin for clang-cl on Windows (GH-131036)
X-Git-Tag: v3.14.0a6~105
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=91d6db7ee0006860a93d96c4c8bc58bfd8a38f6b;p=thirdparty%2FPython%2Fcpython.git
GH-131035: Use -flto=thin for clang-cl on Windows (GH-131036)
---
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 000000000000..43c185610cce
--- /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 30db6824f3ca..d949c37d5625 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)