From 7928160c9a1e6252506b0869c1f00f0a09769d5f Mon Sep 17 00:00:00 2001
From: Sergey Fedorov <barracuda@macos-powerpc.org>
Date: Wed, 29 Jul 2026 22:21:25 +0000
Subject: [PATCH 9/9] Build the pywatchman C extension with the configured
 compiler
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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K6JXw8CwYRiXvqHMBGZRgP
---
 CMakeLists.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b507c82..2cde575 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -447,6 +447,12 @@ if(Python3_Development_FOUND)
     COMMAND ${CMAKE_COMMAND} -E env
       CMAKE_CURRENT_SOURCE_DIR=${CMAKE_CURRENT_SOURCE_DIR}
       CMAKE_CURRENT_BINARY_DIR=${CMAKE_CURRENT_BINARY_DIR}
+      # Build the C extension with the same compiler as the rest of
+      # the build. Without this, distutils uses the CC recorded in the Python
+      # installation's sysconfig data, which may not even exist on this
+      # machine.
+      CC=${CMAKE_C_COMPILER}
+      CXX=${CMAKE_CXX_COMPILER}
       ${Python3_EXECUTABLE} ${SETUP_PY} build --build-base ${PYOUT}
     COMMAND ${CMAKE_COMMAND} -E touch ${PYOUT}
   )
@@ -455,6 +461,8 @@ if(Python3_Development_FOUND)
     execute_process(COMMAND
       ${CMAKE_COMMAND} -E env
         CMAKE_CURRENT_SOURCE_DIR=${CMAKE_CURRENT_SOURCE_DIR}
+        CC=${CMAKE_C_COMPILER}
+        CXX=${CMAKE_CXX_COMPILER}
         ${Python3_EXECUTABLE} ${SETUP_PY} install
         --root $ENV{DESTDIR}${CMAKE_INSTALL_PREFIX}
       WORKING_DIRECTORY ${PYWATCHMAN_BASE}