From 89068dd405f68d06f0bf772b649fe043e7719d24 Mon Sep 17 00:00:00 2001
From: autoantwort <41973254+autoantwort@users.noreply.github.com>
Date: Thu, 16 Jan 2025 09:48:37 +0100
Subject: [PATCH] Compiler detection: Cache compiler hash: Set compiler file
 hash cache variable (#1558)

---
 include/vcpkg/base/contractual-constants.h | 2 ++
 include/vcpkg/installedpaths.h             | 1 +
 src/vcpkg/commands.build.cpp               | 2 ++
 3 files changed, 5 insertions(+)

diff --git a/include/vcpkg/base/contractual-constants.h b/include/vcpkg/base/contractual-constants.h
index fdb5c6cbba..0be218d064 100644
--- a/include/vcpkg/base/contractual-constants.h
+++ b/include/vcpkg/base/contractual-constants.h
@@ -339,6 +339,7 @@ namespace vcpkg
     inline constexpr StringLiteral FileBaselineDotJson = "baseline.json";
     inline constexpr StringLiteral FileBin = "bin";
     inline constexpr StringLiteral FileControl = "CONTROL";
+    inline constexpr StringLiteral FileCompilerFileHashCacheDotJson = "compiler-file-hash-cache.json";
     inline constexpr StringLiteral FileCopying = "COPYING";
     inline constexpr StringLiteral FileCopyright = "copyright";
     inline constexpr StringLiteral FileDebug = "debug";
@@ -377,6 +378,7 @@ namespace vcpkg
     inline constexpr StringLiteral CMakeVariableCMakeSystemName = "VCPKG_CMAKE_SYSTEM_NAME";
     inline constexpr StringLiteral CMakeVariableCMakeSystemVersion = "VCPKG_CMAKE_SYSTEM_VERSION";
     inline constexpr StringLiteral CMakeVariableCmd = "CMD";
+    inline constexpr StringLiteral CMakeVariableCompilerCacheFile = "VCPKG_COMPILER_CACHE_FILE";
     inline constexpr StringLiteral CMakeVariableConcurrency = "VCPKG_CONCURRENCY";
     inline constexpr StringLiteral CMakeVariableCurrentBuildtreesDir = "CURRENT_BUILDTREES_DIR";
     inline constexpr StringLiteral CMakeVariableCurrentPackagesDir = "CURRENT_PACKAGES_DIR";
diff --git a/include/vcpkg/installedpaths.h b/include/vcpkg/installedpaths.h
index 08349eb24f..2dcb673362 100644
--- a/include/vcpkg/installedpaths.h
+++ b/include/vcpkg/installedpaths.h
@@ -21,6 +21,7 @@ namespace vcpkg
         Path vcpkg_dir_status_file() const { return vcpkg_dir() / FileStatus; }
         Path vcpkg_dir_info() const { return vcpkg_dir() / FileInfo; }
         Path vcpkg_dir_updates() const { return vcpkg_dir() / FileUpdates; }
+        Path compiler_hash_cache_file() const { return vcpkg_dir() / FileCompilerFileHashCacheDotJson; }
         Path lockfile_path() const { return vcpkg_dir() / FileVcpkgLock; }
         Path triplet_dir(Triplet t) const { return m_root / t.canonical_name(); }
         Path share_dir(const PackageSpec& p) const { return triplet_dir(p.triplet()) / FileShare / p.name(); }
diff --git a/src/vcpkg/commands.build.cpp b/src/vcpkg/commands.build.cpp
index e9e80f5686..745c6d0e13 100644
--- a/src/vcpkg/commands.build.cpp
+++ b/src/vcpkg/commands.build.cpp
@@ -695,7 +695,9 @@ namespace vcpkg
              paths.packages() / fmt::format("{}_{}", FileDetectCompiler, triplet.canonical_name())},
             // The detect_compiler "port" doesn't depend on the host triplet, so always natively compile
             {CMakeVariableHostTriplet, triplet.canonical_name()},
+            {CMakeVariableCompilerCacheFile, paths.installed().compiler_hash_cache_file()},
         };
+
         get_generic_cmake_build_args(paths, triplet, toolset, cmake_args);
 
         auto cmd = vcpkg::make_cmake_cmd(paths, paths.ports_cmake, std::move(cmake_args));