From b3baa97e80af96eaeb7d0599e2d00071a945f7b8 Mon Sep 17 00:00:00 2001
From: Yohann Benedic <yohann@de2600.ispfr.net>
Date: Mon, 30 Apr 2018 14:19:11 +0200
Subject: Source_Group: Allow an empty prefix with the TREE syntax.

When calling

    source_group(TREE <root> PREFIX "" FILES ...)

the files located at the root directory were not assigned
to the correct source group: they were put in a default
group (e.g. "Source Files" in Visual Studio).

Fixes: #17608
---
 Source/cmSourceGroupCommand.cxx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Source/cmSourceGroupCommand.cxx b/Source/cmSourceGroupCommand.cxx
index 8c9b63c..c3df313 100644
--- a/Source/cmSourceGroupCommand.cxx
+++ b/Source/cmSourceGroupCommand.cxx
@@ -101,9 +101,13 @@ bool addFilesToItsSourceGroups(const std::string& root,
       tokenizedPath = tokenizePath(sgFilesPath);
     }
 
-    if (tokenizedPath.size() > 1) {
+    if (!tokenizedPath.empty()) {
       tokenizedPath.pop_back();
 
+      if (tokenizedPath.empty()) {
+        tokenizedPath.push_back("");
+      }
+
       sg = makefile.GetOrCreateSourceGroup(tokenizedPath);
 
       if (!sg) {
-- 
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