[ci] print out the dependencies that were unmet

include/vcpkg/build.h

@@ -213,7 +213,6 @@ namespace vcpkg::Build
 
     StringLiteral to_string_locale_invariant(const BuildResult build_result);
     LocalizedString to_string(const BuildResult build_result);
-    std::string create_error_message(const BuildResult build_result, const PackageSpec& spec);
     std::string create_user_troubleshooting_message(const Dependencies::InstallPlanAction& action,
                                                     const VcpkgPaths& paths);
 
@@ -264,6 +263,8 @@ namespace vcpkg::Build
         std::unique_ptr<BinaryControlFile> binary_control_file;
     };
 
+    LocalizedString create_error_message(const ExtendedBuildResult& build_result, const PackageSpec& spec);
+
     ExtendedBuildResult build_package(const VcpkgCmdArguments& args,
                                       const VcpkgPaths& paths,
                                       const Dependencies::InstallPlanAction& config,

locales/messages.en.json

@@ -21,6 +21,8 @@
   "BuildResultSucceeded": "SUCCEEDED",
   "BuildResultSummaryHeader": "SUMMARY FOR {triplet}",
   "BuildResultSummaryLine": "    {build_result}: {count}",
+  "BuildingPackageFailed": "building package {spec} failed with: {build_result}",
+  "BuildingPackageFailedDueToMissingDeps": "due to the following missing dependencies:",
   "ChecksFailedCheck": "vcpkg has crashed; no additional details are available.",
   "ChecksLineInfo": "{vcpkg_line_info}: ",
   "ChecksUnreachableCode": "unreachable code was reached",

locales/messages.json

@@ -42,6 +42,10 @@
   "_BuildResultSummaryHeader.comment": "Displayed before a list of a summary installation results.\nexample of {triplet} is 'x64-windows'.\n",
   "BuildResultSummaryLine": "    {build_result}: {count}",
   "_BuildResultSummaryLine.comment": "Displayed to show a count of results of a build_result in a summary.\nexample of {build_result} is 'One of the BuildResultXxx messages (such as BuildResultSucceeded/SUCCEEDED)'.\nexample of {count} is '42'.\n",
+  "BuildingPackageFailed": "building package {spec} failed with: {build_result}",
+  "_BuildingPackageFailed.comment": "example of {spec} is 'zlib:x64-windows'.\nexample of {build_result} is 'One of the BuildResultXxx messages (such as BuildResultSucceeded/SUCCEEDED)'.\n",
+  "BuildingPackageFailedDueToMissingDeps": "due to the following missing dependencies:",
+  "_BuildingPackageFailedDueToMissingDeps.comment": "Printed after BuildingPackageFailed, and followed by a list of dependencies that were missing.\n",
   "ChecksFailedCheck": "vcpkg has crashed; no additional details are available.",
   "ChecksLineInfo": "{vcpkg_line_info}: ",
   "_ChecksLineInfo.comment": "{Locked}",

src/vcpkg/build.cpp

@@ -107,6 +107,16 @@ namespace
                                  "Printed after the name of an installed entity to indicate that it was successfully "
                                  "downloaded but no build or install was requested.",
                                  "DOWNLOADED");
+
+    DECLARE_AND_REGISTER_MESSAGE(BuildingPackageFailed,
+                                 (msg::spec, msg::build_result),
+                                 "",
+                                 "building package {spec} failed with: {build_result}");
+    DECLARE_AND_REGISTER_MESSAGE(
+        BuildingPackageFailedDueToMissingDeps,
+        (),
+        "Printed after BuildingPackageFailed, and followed by a list of dependencies that were missing.",
+        "due to the following missing dependencies:");
 }
 
 namespace vcpkg::Build
@@ -1462,10 +1472,24 @@ namespace vcpkg::Build
         }
     }
 
-    std::string create_error_message(const BuildResult build_result, const PackageSpec& spec)
+    LocalizedString create_error_message(const ExtendedBuildResult& build_result, const PackageSpec& spec)
     {
-        return Strings::format(
-            "Error: Building package %s failed with: %s", spec, Build::to_string_locale_invariant(build_result));
+        auto res = msg::format(msg::msgErrorMessage)
+                       .append(msgBuildingPackageFailed,
+                               msg::spec = spec,
+                               msg::build_result = to_string_locale_invariant(build_result.code));
+
+        if (build_result.code == BuildResult::CASCADED_DUE_TO_MISSING_DEPENDENCIES)
+        {
+            res.appendnl().append(msgBuildingPackageFailedDueToMissingDeps);
+
+            for (const auto& missing_spec : build_result.unmet_dependencies)
+            {
+                res.appendnl().append_indent().append_raw(missing_spec.to_string());
+            }
+        }
+
+        return res;
     }
 
     std::string create_user_troubleshooting_message(const InstallPlanAction& action, const VcpkgPaths& paths)

src/vcpkg/install.cpp

@@ -379,7 +379,7 @@ namespace vcpkg::Install
 
                 if (result.code != Build::BuildResult::SUCCEEDED)
                 {
-                    print2(Color::error, Build::create_error_message(result.code, action.spec), "\n");
+                    msg::println(Color::error, Build::create_error_message(result, action.spec));
                     return result;
                 }