install: Revert CODE,SCRIPT support for generator expressions

Revert commit v3.13.0-rc1~441^2 (install: Teach CODE,SCRIPT modes to
evaluate generator expressions, 2018-05-29).  Unfortunately it has
been found to break existing code in a real project, e.g.

    install(CODE [[
        message("$<FOOBAR>")
    ]])

Address this regression by reverting support for the 3.13 release
series.  Support can be restored later with a policy for compatibility.

Issue: #15785
Fixes: #18435

1 files changed, 8 insertions, 32 deletions

diff --git a/Source/cmInstallScriptGenerator.cxx b/Source/cmInstallScriptGenerator.cxx
index 3a90f4c..f7e6e44 100644
--- a/Source/cmInstallScriptGenerator.cxx
+++ b/Source/cmInstallScriptGenerator.cxx
@@ -2,7 +2,6 @@
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #include "cmInstallScriptGenerator.h"
 
-#include "cmGeneratorExpression.h"
 #include "cmScriptGenerator.h"
 
 #include <ostream>
@@ -17,47 +16,24 @@ cmInstallScriptGenerator::cmInstallScriptGenerator(const char* script,
   , Script(script)
   , Code(code)
 {
-  // We need per-config actions if the script has generator expressions.
-  if (cmGeneratorExpression::Find(Script) != std::string::npos) {
-    this->ActionsPerConfig = true;
-  }
 }
 
 cmInstallScriptGenerator::~cmInstallScriptGenerator()
 {
 }
 
-void cmInstallScriptGenerator::Compute(cmLocalGenerator* lg)
+void cmInstallScriptGenerator::GenerateScript(std::ostream& os)
 {
-  this->LocalGenerator = lg;
-}
+  Indent indent;
+  std::string component_test =
+    this->CreateComponentTest(this->Component.c_str(), this->ExcludeFromAll);
+  os << indent << "if(" << component_test << ")\n";
 
-void cmInstallScriptGenerator::AddScriptInstallRule(std::ostream& os,
-                                                    Indent indent,
-                                                    std::string const& script)
-{
   if (this->Code) {
-    os << indent.Next() << script << "\n";
-  } else {
-    os << indent.Next() << "include(\"" << script << "\")\n";
-  }
-}
-
-void cmInstallScriptGenerator::GenerateScriptActions(std::ostream& os,
-                                                     Indent indent)
-{
-  if (this->ActionsPerConfig) {
-    this->cmInstallGenerator::GenerateScriptActions(os, indent);
+    os << indent.Next() << this->Script << "\n";
   } else {
-    this->AddScriptInstallRule(os, indent, this->Script);
+    os << indent.Next() << "include(\"" << this->Script << "\")\n";
   }
-}
 
-void cmInstallScriptGenerator::GenerateScriptForConfig(
-  std::ostream& os, const std::string& config, Indent indent)
-{
-  cmGeneratorExpression ge;
-  std::unique_ptr<cmCompiledGeneratorExpression> cge = ge.Parse(this->Script);
-  this->AddScriptInstallRule(os, indent,
-                             cge->Evaluate(this->LocalGenerator, config));
+  os << indent << "endif()\n\n";
 }