Rework vcpkg's triplet environment reading

The triplet is "run" and vcpkg observes the environment.
Previously, the environment was deduced by the triplet's name

4 files changed, 27 insertions, 5 deletions

diff --git a/toolsrc/include/PostBuildLint.h b/toolsrc/include/PostBuildLint.h
index 0ee47d0c1..69fafc9f7 100644
--- a/toolsrc/include/PostBuildLint.h
+++ b/toolsrc/include/PostBuildLint.h
@@ -5,5 +5,8 @@
 
 namespace vcpkg::PostBuildLint
 {
-    size_t perform_all_checks(const PackageSpec& spec, const VcpkgPaths& paths, const Build::BuildInfo& build_info);
+    size_t perform_all_checks(const PackageSpec& spec,
+                              const VcpkgPaths& paths,
+                              const Build::PreBuildInfo& pre_build_info,
+                              const Build::BuildInfo& build_info);
 }
diff --git a/toolsrc/include/triplet.h b/toolsrc/include/triplet.h
index 4d837bc47..e634afd3f 100644
--- a/toolsrc/include/triplet.h
+++ b/toolsrc/include/triplet.h
@@ -15,8 +15,6 @@ namespace vcpkg
         static const Triplet ARM_UWP;
 
         const std::string& canonical_name() const;
-        std::string architecture() const;
-        std::string system() const;
         const std::string& to_string() const;
 
     private:
diff --git a/toolsrc/include/vcpkg_Build.h b/toolsrc/include/vcpkg_Build.h
index 28ddb0d16..4deb81900 100644
--- a/toolsrc/include/vcpkg_Build.h
+++ b/toolsrc/include/vcpkg_Build.h
@@ -8,7 +8,6 @@
 #include "vcpkg_Files.h"
 #include "vcpkg_optional.h"
 #include <map>
-#include <string>
 #include <unordered_map>
 #include <vector>
 
@@ -33,7 +32,17 @@ namespace vcpkg::Build
     std::string create_error_message(const BuildResult build_result, const PackageSpec& spec);
     std::string create_user_troubleshooting_message(const PackageSpec& spec);
 
-    std::wstring make_build_env_cmd(const Triplet& triplet, const Toolset& toolset);
+    struct PreBuildInfo
+    {
+        static PreBuildInfo from_triplet_file(const VcpkgPaths& paths, const Triplet& triplet);
+
+        std::string target_architecture;
+        std::string cmake_system_name;
+        std::string cmake_system_version;
+        std::string platform_toolset;
+    };
+
+    std::wstring make_build_env_cmd(const PreBuildInfo& pre_build_info, const Toolset& toolset);
 
     struct ExtendedBuildResult
     {
diff --git a/toolsrc/include/vcpkg_System.h b/toolsrc/include/vcpkg_System.h
index bb478944a..71033a642 100644
--- a/toolsrc/include/vcpkg_System.h
+++ b/toolsrc/include/vcpkg_System.h
@@ -65,6 +65,18 @@ namespace vcpkg::System
 
     Optional<std::wstring> get_registry_string(HKEY base, const CWStringView subkey, const CWStringView valuename);
 
+    enum class CPUArchitecture
+    {
+        X86,
+        X64,
+        ARM,
+        ARM64,
+    };
+
+    Optional<CPUArchitecture> to_cpu_architecture(CStringView arch);
+
+    CPUArchitecture get_host_processor();
+
     const fs::path& get_ProgramFiles_32_bit();
 
     const fs::path& get_ProgramFiles_platform_bitness();