https://github.com/python/cpython/commit/9028df36bb9e2942b19164f6708f9cf8a55c5ce9
commit: 9028df36bb9e2942b19164f6708f9cf8a55c5ce9
branch: main
author: Chris Eibl <[email protected]>
committer: chris-eibl <[email protected]>
date: 2026-10-06T06:36:02Z
summary:
gh-157789: Use compiler option ``-Og`` in case of clang-cl debug builds
(#157791)
Use compiler option ``-Og`` in case of clang-cl debug builds on Windows to
reduce stack usage.
files:
A Misc/NEWS.d/next/Windows/2026-09-19-13-18-48.gh-issue-157789.o6-rmo.rst
M PCbuild/pyproject-clangcl.props
diff --git
a/Misc/NEWS.d/next/Windows/2026-09-19-13-18-48.gh-issue-157789.o6-rmo.rst
b/Misc/NEWS.d/next/Windows/2026-09-19-13-18-48.gh-issue-157789.o6-rmo.rst
new file mode 100644
index 000000000000000..f7f998b9eced36a
--- /dev/null
+++ b/Misc/NEWS.d/next/Windows/2026-09-19-13-18-48.gh-issue-157789.o6-rmo.rst
@@ -0,0 +1,2 @@
+Use compiler option ``-Og`` in case of clang-cl debug builds on Windows to
+reduce stack usage. Patch by Chris Eibl.
diff --git a/PCbuild/pyproject-clangcl.props b/PCbuild/pyproject-clangcl.props
index 70a81ca7da306c3..14843f18823ca9b 100644
--- a/PCbuild/pyproject-clangcl.props
+++ b/PCbuild/pyproject-clangcl.props
@@ -50,6 +50,7 @@
<AdditionalOptions Condition="'$(Platform)' == 'Win32'">-m32
%(AdditionalOptions)</AdditionalOptions>
<AdditionalOptions Condition="'$(Platform)' == 'x64'">-m64
%(AdditionalOptions)</AdditionalOptions>
<AdditionalOptions Condition="$(Configuration) != 'Debug'">-flto=thin
%(AdditionalOptions)</AdditionalOptions>
+ <AdditionalOptions Condition="$(Configuration) ==
'Debug'">%(AdditionalOptions) -Xclang -Og</AdditionalOptions>
<AdditionalOptions Condition="$(SupportPGO) and $(Configuration) ==
'PGInstrument'">-fprofile-instr-generate=$(_CLANG_PROFILE_PATH)$(TargetName)_%m.profraw
%(AdditionalOptions)</AdditionalOptions>
<AdditionalOptions Condition="$(SupportPGO) and $(Configuration) ==
'PGUpdate'">-fprofile-instr-use=$(OutDir)instrumented\profdata.profdata
-Wno-profile-instr-unprofiled %(AdditionalOptions)</AdditionalOptions>
</ClCompile>
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