Fix scons compilation flag for windows. Use git describe with '--tags' to handle lightweight tags

Author: vincefn

SConstruct

@@ -160,7 +160,7 @@ if platform.system().lower() == "windows":
     env.AppendUnique(CPPDEFINES='BOOST_ALL_NO_LIB')
     # Prevent the generation of an import lib (.lib) in addition to the dll
     # env.AppendUnique(no_import_lib=1)
-    env.PrependUnique(CCFLAGS=['/Ox', '/EHsc', '/MD'])
+    env.PrependUnique(CCFLAGS=['/Ox', '/EHsc', '/MD', '/DREAL=double'])
     env.AppendUnique(CPPDEFINES={'NDEBUG': None})
 else:
     if 'CONDA_BUILD' not in os.environ:

setup.py

@@ -101,7 +101,7 @@ def create_extensions():
 def gitinfo():
     from subprocess import Popen, PIPE
     kw = dict(stdout=PIPE, cwd=MYDIR, universal_newlines=True)
-    proc = Popen(['git', 'describe', '--match=v[[:digit:]]*'], **kw)
+    proc = Popen(['git', 'describe', '--match=v[[:digit:]]*', '--tags'], **kw)
     desc = proc.stdout.read()
     proc = Popen(['git', 'log', '-1', '--format=%H %ct %ci'], **kw)
     glog = proc.stdout.read()