Some projects don't prepend the tag with 'v' for the version

[mtvee]

Some projects don't use the 'v' when tagging. CPM.cmake assumes/adds a 'v' in front on the tag for VERSION. Perhaps it should just use what it is given?

<+>UTF-8
===================================================================
--- cmake/CPM.cmake	(revision 42a2615a11b234c89fbbfb687bfabcfff35848d7)
+++ cmake/CPM.cmake	(date 1606469749260)
@@ -226,7 +226,7 @@
     if (DEFINED CPM_ARGS_GIT_REPOSITORY)
         list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_REPOSITORY ${CPM_ARGS_GIT_REPOSITORY})
         if (NOT DEFINED CPM_ARGS_GIT_TAG)
-            set(CPM_ARGS_GIT_TAG v${CPM_ARGS_VERSION})
+            set(CPM_ARGS_GIT_TAG ${CPM_ARGS_VERSION})
         endif()
     endif()

[TheLartians]

From my experience, most projects actually do use the v prefix. Also it's the suggested format by GitHub, so imo it's reasonable to have it as the default. For all other conventions you can still explicitly specify GIT_TAG besides the version.

[TheLartians]

Also duplicate of #106 and #140.