Memory sanitizer reports clippy error during compile

[louberger]

Note, must use clang not gcc.
Configured using:

'./configure' '--disable-nhrpd' '--enable-static' '--disable-shared' '--prefix=/usr' '--localstatedir=/var/run/frr' '--sbindir=/usr/lib/frr' '--sysconfdir=/etc/frr' '--enable-vtysh' '--enable-pimd' '--enable-multipath=64' '--enable-user=frr' '--enable-group=frr' '--enable-vty-group=frrvty' --enable-memory-sanitizer CC=clang

see:

make[2]: Entering directory '...'
LSAN_OPTIONS="suppressions=./tools/lsan-suppressions.txt" ./lib/clippy ./python/clidef.py -o ospfd/ospf_vty_clippy.c ospfd/ospf_vty.c
Uninitialized bytes in __interceptor_strlen at offset 0 inside [0x724000008000, 32)
==18114==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x7f87aedc857d  (/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0+0x7157d)
    #1 0x7f87aedc8d75  (/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0+0x71d75)
    #2 0x7f87aedcba6f  (/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0+0x74a6f)
    #3 0x7f87aedcc5c8 in PyTokenizer_Get (/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0+0x755c8)
    #4 0x7f87aedc7851  (/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0+0x70851)
    #5 0x7f87aef0083c in PyParser_ASTFromFileObject (/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0+0x1a983c)
    #6 0x7f87aef00ea4 in PyRun_FileExFlags (/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0+0x1a9ea4)
    #7 0x7f87aef0104e in PyRun_SimpleFileExFlags (/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0+0x1aa04e)
    #8 0x556aac07c2a6 in main .../lib/clippy.c:83:6
    #9 0x7f87ad7b91c0 in __libc_start_main /build/glibc-itYbWN/glibc-2.26/csu/../csu/libc-start.c:308
    #10 0x556aac007ec9 in _start (.../lib/clippy+0x20ec9)

SUMMARY: MemorySanitizer: use-of-uninitialized-value (/usr/lib/x86_64-linux-gnu/libpython3.6m.so.1.0+0x7157d) 
Exiting
Makefile:4921: recipe for target 'ospfd/ospf_vty_clippy.c' failed
make[2]: *** [ospfd/ospf_vty_clippy.c] Error 77
make[2]: Leaving directory '...'
Makefile:4426: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '...'
Makefile:1960: recipe for target 'all' failed
make: *** [all] Error 2