[Bug libstdc++/67996] std::ios_base::seekdir raises -Wswitch with Clang

["kim.grasman at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67996

--- Comment #4 from Kim GrÃsman <kim.grasman at gmail dot com> ---
FWIW, it turns out that GCC warns, too:

    $ g++ -Iinclude -I/ssd/code/poco/CppUnit/include
-I/ssd/code/poco/CppUnit/WinTestRunner/include
-I/ssd/code/poco/Foundation/include -I/ssd/code/poco/XML/include
-I/ssd/code/poco/Util/include -I/ssd/code/poco/Net/include
-I/ssd/code/poco/Crypto/include -I/ssd/code/poco/NetSSL_OpenSSL/include
-I/ssd/code/poco/Data/include -I/ssd/code/poco/Data/SQLite/include
-I/ssd/code/poco/Data/ODBC/include -I/ssd/code/poco/Data/MySQL/include
-I/ssd/code/poco/Zip/include -I/ssd/code/poco/PageCompiler/include
-I/ssd/code/poco/PageCompiler/File2Page/include -I/ssd/code/poco/PDF/include
-I/ssd/code/poco/CppParser/include -I/ssd/code/poco/MongoDB/include
-I/ssd/code/poco/PocoDoc/include -I/ssd/code/poco/ProGen/include -Wall
-Wno-sign-compare -DPOCO_UTIL_NO_JSONCONFIGURATION   -DPOCO_HAVE_IPv6
-D_XOPEN_SOURCE=500 -D_REENTRANT -D_THREAD_SAFE -D_FILE_OFFSET_BITS=64
-D_LARGEFILE64_SOURCE -DPOCO_HAVE_FD_EPOLL  -O2 -DNDEBUG -fPIC -c
src/MemoryStream.cpp -o
/ssd/code/poco/Foundation/obj/Linux/x86_64/release_shared/MemoryStream.o
In file included from src/MemoryStream.cpp:17:0:
include/Poco/MemoryStream.h: In instantiation of
âPoco::BasicMemoryStreamBuf<ch, tr>::pos_type Poco::BasicMemoryStreamBuf<ch,
tr>::seekoff(Poco::BasicMemoryStreamBuf<ch, tr>::off_type,
std::ios_base::seekdir, std::ios_base::openmode) [with ch = char; tr =
std::char_traits<char>; Poco::BasicMemoryStreamBuf<ch, tr>::pos_type =
std::fpos<__mbstate_t>; Poco::BasicMemoryStreamBuf<ch, tr>::off_type = long
int; std::ios_base::seekdir = std::_Ios_Seekdir; std::ios_base::openmode =
std::_Ios_Openmode]â:
src/MemoryStream.cpp:59:1:   required from here
include/Poco/MemoryStream.h:87:4: warning: enumeration value
â_S_ios_seekdir_endâ not handled in switch [-Wswitch]
    switch (way)
    ^
include/Poco/MemoryStream.h:113:4: warning: enumeration value
â_S_ios_seekdir_endâ not handled in switch [-Wswitch]
    switch (way)
    ^

This is the age-old GCC 4.6.3 that we're stuck on, however, later versions may
be more forgiving.