Genex: Allow TARGET_OBJECTS to be used everywhere

Previously the `TARGET_OBJECTS` generator expression was limited
only to use in a buildsystem context so that Xcode's placeholders
in object file paths can be evaluated.  Lift this restriction so
that the expression can at least be used in most settings.

Co-Author: Brad King <brad.king@kitware.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/Source/cmGeneratorExpressionEvaluationFile.cxx b/Source/cmGeneratorExpressionEvaluationFile.cxx
index dc54488..1526454 100644
--- a/Source/cmGeneratorExpressionEvaluationFile.cxx
+++ b/Source/cmGeneratorExpressionEvaluationFile.cxx
@@ -64,8 +64,10 @@ void cmGeneratorExpressionEvaluationFile::Generate(
       return;
     }
     std::ostringstream e;
-    e << "Evaluation file to be written multiple times for different "
-         "configurations or languages with different content:\n  "
+    e << "Evaluation file to be written multiple times with different "
+         "content. "
+         "This is generally caused by the content evaluating the "
+         "configuration type, language, or location of object files:\n "
       << outputFileName;
     lg->IssueMessage(cmake::FATAL_ERROR, e.str());
     return;