[Patch-gnuradio] [PATCH 2/2] cmake: fix use of git describe when we are building a tagged version

[Timo Juhani Lindfors]

This patch fixes the case where build fails with

Traceback (most recent call last):
  File "<string>", line 1, in <module>
AttributeError: 'NoneType' object has no attribute 'groups'
CMake Error at cmake/Modules/GrVersion.cmake:71 (list):
  list index: 0 out of range (-0, 18446744073709551615)
Call Stack (most recent call first):
  CMakeLists.txt:41 (include)

since

git describe --always --abbrev=8

does not always print sequence number and commit (in my case it
printed "v3.5.0git" since I had not made any changes since the
release).
---
 cmake/Modules/GrVersion.cmake |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/cmake/Modules/GrVersion.cmake b/cmake/Modules/GrVersion.cmake
index 16338f1..13cc6bb 100644
--- a/cmake/Modules/GrVersion.cmake
+++ b/cmake/Modules/GrVersion.cmake
@@ -47,7 +47,7 @@ find_package(Git)
 if(GIT_FOUND AND EXISTS ${CMAKE_SOURCE_DIR}/.git)
     message(STATUS "Extracting version information from git describe...")
     execute_process(
-        COMMAND ${GIT_EXECUTABLE} describe --always --abbrev=8
+        COMMAND ${GIT_EXECUTABLE} describe --always --abbrev=8 --long
         OUTPUT_VARIABLE GIT_DESCRIBE OUTPUT_STRIP_TRAILING_WHITESPACE
         WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
     )
-- 
1.7.2.5