commit c186a4335531c5ef1572917c113f7b49400b7c00
author Brad King <brad.king@kitware.com> Mon Jul 27 14:44:54 2020 +0000
committer Kitware Robot <kwrobot@kitware.com> Mon Jul 27 10:46:35 2020 -0400
tree f391be097e5044199d8e1df9b80d0f7e4eb236ec
parent c144eb5fd9c5f98478007017093049d5e94ac1d0
parent 8dbefc3ca6ab7043efb85bcfb6b53aa22c31b1df

Merge topic 'externalproject-download-git-2.20-fix'

8dbefc3ca6 ExternalProject: omit --no-checkout from git clone when using git 2.20.x.

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !5054

Modules/ExternalProject.cmake

diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index 3a47090..aecc00b 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -1124,7 +1124,11 @@
     message(FATAL_ERROR "Tag for git checkout should not be empty.")
   endif()
 
-  set(git_clone_options "--no-checkout")
+  if(GIT_VERSION_STRING VERSION_LESS 2.20 OR 2.21 VERSION_LESS_EQUAL GIT_VERSION_STRING)
+    set(git_clone_options "--no-checkout")
+  else()
+    set(git_clone_options)
+  endif()
   if(git_shallow)
     if(NOT GIT_VERSION_STRING VERSION_LESS 1.7.10)
       list(APPEND git_clone_options "--depth 1 --no-single-branch")