From 810cd002e874ee37ea9d47b56834260846f16644 Mon Sep 17 00:00:00 2001
From: Garrett Campbell <86264750+gcampbell-msft@users.noreply.github.com>
Date: Fri, 16 Feb 2024 13:31:14 -0500
Subject: [PATCH] Fix order of CMakePresets inheritance (#3595)

* fix order of inherit

* add changelog
---
 CHANGELOG.md  |  1 +
 src/preset.ts | 23 +++++++++++++++--------
 2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0bc97cf89..c58e5c4a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 Bug Fixes:
 
 - Fix an issue where we weren't able to run tests when not using Presets. [#3589](https://github.com/microsoft/vscode-cmake-tools/issues/3589)
+- Fix the order of preference for CMake Presets `inherit` field. [#3594](https://github.com/microsoft/vscode-cmake-tools/issues/3594)
 
 ## 1.17.15
 
diff --git a/src/preset.ts b/src/preset.ts
index b5bcba298..7ffbdd485 100644
--- a/src/preset.ts
+++ b/src/preset.ts
@@ -625,7 +625,8 @@ function getVendorForConfigurePresetHelper(folder: string, preset: ConfigurePres
         if (util.isString(preset.inherits)) {
             preset.inherits = [preset.inherits];
         }
-        for (const parent of preset.inherits) {
+        const reversedInherits = preset.inherits.slice().reverse();
+        for (const parent of reversedInherits) {
             const parentVendor = getVendorForConfigurePresetImpl(folder, parent, allowUserPreset);
             if (parentVendor) {
                 for (const key in parentVendor) {
@@ -763,6 +764,7 @@ export async function expandConfigurePreset(folder: string, name: string, worksp
     const expandedPreset: ConfigurePreset = { name };
     const expansionOpts: ExpansionOptions = await getExpansionOptions(workspaceFolder, sourceDir, preset);
 
+    preset.environment = EnvironmentUtils.mergePreserveNull([process.env, preset.environment]);
     // Expand environment vars first since other fields may refer to them
     if (preset.environment) {
         expandedPreset.environment = EnvironmentUtils.createPreserveNull();
@@ -1109,7 +1111,8 @@ async function expandConfigurePresetHelper(folder: string, preset: ConfigurePres
         if (util.isString(preset.inherits)) {
             preset.inherits = [preset.inherits];
         }
-        for (const parentName of preset.inherits) {
+        const reversedInherits = preset.inherits.slice().reverse();
+        for (const parentName of reversedInherits) {
             const parent = await expandConfigurePresetImpl(folder, parentName, workspaceFolder, sourceDir, allowUserPreset);
             if (parent) {
                 // Inherit environment
@@ -1132,7 +1135,6 @@ async function expandConfigurePresetHelper(folder: string, preset: ConfigurePres
         }
     }
 
-    inheritedEnv = EnvironmentUtils.mergePreserveNull([process.env, inheritedEnv]);
     preset.environment = EnvironmentUtils.mergePreserveNull([inheritedEnv, preset.environment]);
 
     preset.__expanded = true;
@@ -1293,7 +1295,8 @@ function getConfigurePresetForPresetHelper(folder: string, preset: BuildPreset |
         if (util.isString(preset.inherits)) {
             preset.inherits = [preset.inherits];
         }
-        for (const parent of preset.inherits) {
+        const reversedInherits = preset.inherits.slice().reverse();
+        for (const parent of reversedInherits) {
             const parentConfigurePreset = getConfigurePresetForPresetImpl(folder, parent, presetType, allowUserPreset);
             if (parentConfigurePreset) {
                 preset.configurePreset = parentConfigurePreset;
@@ -1415,7 +1418,8 @@ async function expandBuildPresetHelper(folder: string, preset: BuildPreset, work
         if (util.isString(preset.inherits)) {
             preset.inherits = [preset.inherits];
         }
-        for (const parentName of preset.inherits) {
+        const reversedInherits = preset.inherits.slice().reverse();
+        for (const parentName of reversedInherits) {
             const parent = await expandBuildPresetImpl(folder, parentName, workspaceFolder, sourceDir, parallelJobs, preferredGeneratorName, allowUserPreset);
             if (parent) {
                 // Inherit environment
@@ -1600,7 +1604,8 @@ async function expandTestPresetHelper(folder: string, preset: TestPreset, worksp
         if (util.isString(preset.inherits)) {
             preset.inherits = [preset.inherits];
         }
-        for (const parentName of preset.inherits) {
+        const reversedInherits = preset.inherits.slice().reverse();
+        for (const parentName of reversedInherits) {
             const parent = await expandTestPresetImpl(folder, parentName, workspaceFolder, sourceDir, preferredGeneratorName, allowUserPreset);
             if (parent) {
                 // Inherit environment
@@ -1728,7 +1733,8 @@ async function expandPackagePresetHelper(folder: string, preset: PackagePreset,
         if (util.isString(preset.inherits)) {
             preset.inherits = [preset.inherits];
         }
-        for (const parentName of preset.inherits) {
+        const reversedInherits = preset.inherits.slice().reverse();
+        for (const parentName of reversedInherits) {
             const parent = await expandPackagePresetImpl(folder, parentName, workspaceFolder, sourceDir, preferredGeneratorName, allowUserPreset);
             if (parent) {
                 // Inherit environment
@@ -1862,7 +1868,8 @@ async function expandWorkflowPresetHelper(folder: string, preset: WorkflowPreset
         if (util.isString(preset.inherits)) {
             preset.inherits = [preset.inherits];
         }
-        for (const parentName of preset.inherits) {
+        const reversedInherits = preset.inherits.slice().reverse();
+        for (const parentName of reversedInherits) {
             const parent = await expandWorkflowPresetImpl(folder, parentName, workspaceFolder, sourceDir, preferredGeneratorName, allowUserPreset);
             if (parent) {
                 // Inherit environment