install: Fix FILES_MATCHING on case-sensitive Mac filesystems (#13177)

Windows and Apple machines have predominantly used case-insensitive
filesystems so our file(INSTALL) command uses case-insensitive pattern
matching.  It is implemented by converting the pattern and file path to
lower case before matching.  The FILES_MATCHING option is implemented by
excluding a path that does not match any pattern unless it is a
directory that must be searched recursively.  However, the test that an
excluded path is a directory is executed on the lower-case path and
therefore fails on mixed-case input paths on case-sensitive filesystems.
Fix the file(INSTALL) implementation to use the lower-case path only for
pattern matching and preserve the original path for tests against the
real filesystem.

1 files changed, 4 insertions, 2 deletions

diff --git a/Source/cmFileCommand.cxx b/Source/cmFileCommand.cxx
index 3f14fa1..aab6446 100644
--- a/Source/cmFileCommand.cxx
+++ b/Source/cmFileCommand.cxx
@@ -1003,7 +1003,9 @@ protected:
     // Match rules are case-insensitive on some platforms.
 #if defined(_WIN32) || defined(__APPLE__) || defined(__CYGWIN__)
     std::string lower = cmSystemTools::LowerCase(file);
-    file = lower.c_str();
+    const char* file_to_match = lower.c_str();
+#else
+    const char* file_to_match = file;
 #endif
 
     // Collect properties from all matching rules.
@@ -1012,7 +1014,7 @@ protected:
     for(std::vector<MatchRule>::iterator mr = this->MatchRules.begin();
         mr != this->MatchRules.end(); ++mr)
       {
-      if(mr->Regex.find(file))
+      if(mr->Regex.find(file_to_match))
         {
         matched = true;
         result.Exclude |= mr->Properties.Exclude;