From 17c484d6502a2547e4807b9a5b888497175e5424 Mon Sep 17 00:00:00 2001
From: _ov4 <ov4@ov4.org>
Date: Tue, 13 Oct 2026 11:46:01 +0000
Subject: build: share local-first dependency lookup across tools and libraries

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
---
 cmake/BuildTools.cmake | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 cmake/BuildTools.cmake

(limited to 'cmake/BuildTools.cmake')

diff --git a/cmake/BuildTools.cmake b/cmake/BuildTools.cmake
new file mode 100644
index 0000000..d6928bb
--- /dev/null
+++ b/cmake/BuildTools.cmake
@@ -0,0 +1,43 @@
+# Resolve tools before project() performs its compiler and generator checks.
+if(CMAKE_GENERATOR MATCHES "Makefiles|Ninja")
+    foreach(language C CXX)
+        if(language STREQUAL "C")
+            set(names clang cc gcc)
+        else()
+            set(names clang++ c++ g++)
+        endif()
+        if(CMAKE_${language}_COMPILER)
+            get_filename_component(requested "${CMAKE_${language}_COMPILER}" NAME)
+            list(INSERT names 0 "${requested}")
+        endif()
+        cpsc_find_dependency(PROGRAM CMAKE_${language}_COMPILER NAMES ${names} REQUIRED)
+        # project() would otherwise restore the previous path from this file.
+        set(compiler_info "${CMAKE_BINARY_DIR}/CMakeFiles/${CMAKE_VERSION}/CMake${language}Compiler.cmake")
+        if(EXISTS "${compiler_info}")
+            file(STRINGS "${compiler_info}" previous
+                REGEX "^set\\(CMAKE_${language}_COMPILER \"")
+            string(REGEX REPLACE "^set\\(CMAKE_${language}_COMPILER \"([^\"]*)\"\\)$"
+                "\\1" previous "${previous}")
+            if(NOT previous STREQUAL CMAKE_${language}_COMPILER)
+                file(REMOVE "${compiler_info}")
+            endif()
+        endif()
+    endforeach()
+endif()
+
+if(CMAKE_GENERATOR MATCHES "Ninja")
+    set(names ninja ninja-build)
+elseif(CMAKE_GENERATOR STREQUAL "MinGW Makefiles")
+    set(names mingw32-make)
+elseif(CMAKE_GENERATOR MATCHES "NMake")
+    set(names nmake)
+elseif(CMAKE_GENERATOR STREQUAL "MSYS Makefiles")
+    set(names make)
+elseif(CMAKE_GENERATOR STREQUAL "Unix Makefiles")
+    set(names gmake make)
+else()
+    set(names)
+endif()
+if(names)
+    cpsc_find_dependency(PROGRAM CMAKE_MAKE_PROGRAM NAMES ${names} REQUIRED)
+endif()
-- 
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