commit 4f497c358e0386b65df1c1d636aadf72f8647134
Author: Nick Cao <nickcao@nichi.co>
Date:   Tue Apr 19 13:49:59 2022 +0800

    patch cmake file generation for nixpkgs packaging
    
    As of qt 6.3.0, installing components into different prefixes is not
    supported. To workaround that, we move files to their designated in the
    postInstall hook. However the generated cmake files still have
    references to the original prefix, and would cause issues when using
    said components as the dependency of other packages. The purpose of this
    patch is to closely match the output layout of qt, and rewrite the
    generated cmake files to point to the corrected pathes.

diff --git a/Source/cmExportFileGenerator.cxx b/Source/cmExportFileGenerator.cxx
index 8b0f64e23b..03291e2ee2 100644
--- a/Source/cmExportFileGenerator.cxx
+++ b/Source/cmExportFileGenerator.cxx
@@ -6,6 +6,7 @@
 #include <cstring>
 #include <sstream>
 #include <utility>
+#include <cstdlib>
 
 #include <cm/memory>
 
@@ -325,9 +326,23 @@ static void prefixItems(std::string& exportDirs)
   for (std::string const& e : entries) {
     exportDirs += sep;
     sep = ";";
-    if (!cmSystemTools::FileIsFullPath(e) &&
-        e.find("${_IMPORT_PREFIX}") == std::string::npos) {
-      exportDirs += "${_IMPORT_PREFIX}/";
+    if (!cmSystemTools::FileIsFullPath(e)) {
+      if (std::getenv("dev")) {
+        if (cmHasLiteralPrefix(e, "include") || cmHasLiteralPrefix(e, "./include")) {
+          exportDirs += std::getenv("dev");
+        } else if (cmHasLiteralPrefix(e, "bin") || cmHasLiteralPrefix(e, "./bin")) {
+          exportDirs += std::getenv("dev");
+        } else if (cmHasLiteralPrefix(e, "mkspecs") || cmHasLiteralPrefix(e, "./mkspecs")) {
+          exportDirs += std::getenv("dev");
+        } else if (cmHasLiteralPrefix(e, "libexec") || cmHasLiteralPrefix(e, "./libexec")) {
+          exportDirs += std::getenv("dev");
+        } else {
+          exportDirs += std::getenv("out");
+        }
+      } else {
+        exportDirs += std::getenv("out");
+      }
+      exportDirs += "/";
     }
     exportDirs += e;
   }
diff --git a/Source/cmExportInstallFileGenerator.cxx b/Source/cmExportInstallFileGenerator.cxx
index 4a3c565bce..5afa9e5e50 100644
--- a/Source/cmExportInstallFileGenerator.cxx
+++ b/Source/cmExportInstallFileGenerator.cxx
@@ -5,6 +5,7 @@
 #include <memory>
 #include <sstream>
 #include <utility>
+#include <cstdlib>
 
 #include "cmExportSet.h"
 #include "cmGeneratedFileStream.h"
@@ -263,7 +264,7 @@ void cmExportInstallFileGenerator::LoadConfigFiles(std::ostream& os)
 
 void cmExportInstallFileGenerator::ReplaceInstallPrefix(std::string& input)
 {
-  cmGeneratorExpression::ReplaceInstallPrefix(input, "${_IMPORT_PREFIX}");
+  cmGeneratorExpression::ReplaceInstallPrefix(input, std::getenv("out"));
 }
 
 bool cmExportInstallFileGenerator::GenerateImportFileConfig(
@@ -381,9 +382,24 @@ void cmExportInstallFileGenerator::SetImportLocationProperty(
   // Construct the installed location of the target.
   std::string dest = itgen->GetDestination(config);
   std::string value;
+
   if (!cmSystemTools::FileIsFullPath(dest)) {
-    // The target is installed relative to the installation prefix.
-    value = "${_IMPORT_PREFIX}/";
+    if (std::getenv("dev")) {
+      if (cmHasLiteralPrefix(dest, "include") || cmHasLiteralPrefix(dest, "./include")) {
+        value = std::getenv("dev");
+      } else if (cmHasLiteralPrefix(dest, "bin") || cmHasLiteralPrefix(dest, "./bin")) {
+        value = std::getenv("dev");
+      } else if (cmHasLiteralPrefix(dest, "mkspecs") || cmHasLiteralPrefix(dest, "./mkspecs")) {
+        value = std::getenv("dev");
+      } else if (cmHasLiteralPrefix(dest, "libexec") || cmHasLiteralPrefix(dest, "./libexec")) {
+        value = std::getenv("dev");
+      } else {
+        value = std::getenv("out");
+      }
+    } else {
+      value = std::getenv("out");
+    }
+    value += "/";
   }
   value += dest;
   value += "/";
diff --git a/Source/cmGeneratorExpression.cxx b/Source/cmGeneratorExpression.cxx
index 840f5112d6..7bb4ab41aa 100644
--- a/Source/cmGeneratorExpression.cxx
+++ b/Source/cmGeneratorExpression.cxx
@@ -197,7 +197,22 @@ static void prefixItems(const std::string& content, std::string& result,
     sep = ";";
     if (!cmSystemTools::FileIsFullPath(e) &&
         cmGeneratorExpression::Find(e) != 0) {
-      result += prefix;
+      if (std::getenv("dev")) {
+        if (cmHasLiteralPrefix(e, "include") || cmHasLiteralPrefix(e, "./include")) {
+          result += std::getenv("dev");
+        } else if (cmHasLiteralPrefix(e, "bin") || cmHasLiteralPrefix(e, "./bin")) {
+          result += std::getenv("dev");
+        } else if (cmHasLiteralPrefix(e, "mkspecs") || cmHasLiteralPrefix(e, "./mkspecs")) {
+          result += std::getenv("dev");
+        } else if (cmHasLiteralPrefix(e, "libexec") || cmHasLiteralPrefix(e, "./libexec")) {
+          result += std::getenv("dev");
+        } else {
+          result += std::getenv("out");
+        }
+      } else {
+        result += std::getenv("out");
+      }
+      result += "/";
     }
     result += e;
   }