Add -msse2 if we build the optimized version

[hynek]

Some compilers (e.g. debian jessie’s gcc) can't handle optimized code without it.

[codecov-io]

Current coverage is 100% (diff: 100%)

Merging #13 into master will not change coverage

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[hynek]

@josechaso could you double check whether this PR branch works without manually passing a CFLAGS to python setup.py build please?

[josechaso]

I tried building the opt-sse2 branch (no extra CFLAGS added) and compiled
fine.

(build log)

python setup.py build
running build
running build_py
running build_clib
building 'libargon2' library
i586-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall
-Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g
-fstack-protector-strong -Wformat -Werror=format-security -fPIC -msse2
-Iextras/libargon2/src/../include -Iextras/libargon2/src/blake2 -c
extras/libargon2/src/argon2.c -o
build/temp.linux-i686-2.7/extras/libargon2/src/argon2.o
i586-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall
-Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g
-fstack-protector-strong -Wformat -Werror=format-security -fPIC -msse2
-Iextras/libargon2/src/../include -Iextras/libargon2/src/blake2 -c
extras/libargon2/src/blake2/blake2b.c -o
build/temp.linux-i686-2.7/extras/libargon2/src/blake2/blake2b.o
i586-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall
-Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g
-fstack-protector-strong -Wformat -Werror=format-security -fPIC -msse2
-Iextras/libargon2/src/../include -Iextras/libargon2/src/blake2 -c
extras/libargon2/src/core.c -o
build/temp.linux-i686-2.7/extras/libargon2/src/core.o
i586-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall
-Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g
-fstack-protector-strong -Wformat -Werror=format-security -fPIC -msse2
-Iextras/libargon2/src/../include -Iextras/libargon2/src/blake2 -c
extras/libargon2/src/encoding.c -o
build/temp.linux-i686-2.7/extras/libargon2/src/encoding.o
i586-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall
-Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g
-fstack-protector-strong -Wformat -Werror=format-security -fPIC -msse2
-Iextras/libargon2/src/../include -Iextras/libargon2/src/blake2 -c
extras/libargon2/src/opt.c -o
build/temp.linux-i686-2.7/extras/libargon2/src/opt.o
i586-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall
-Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g
-fstack-protector-strong -Wformat -Werror=format-security -fPIC -msse2
-Iextras/libargon2/src/../include -Iextras/libargon2/src/blake2 -c
extras/libargon2/src/thread.c -o
build/temp.linux-i686-2.7/extras/libargon2/src/thread.o
i586-linux-gnu-gcc-ar rc build/temp.linux-i686-2.7/liblibargon2.a
build/temp.linux-i686-2.7/extras/libargon2/src/argon2.o
build/temp.linux-i686-2.7/extras/libargon2/src/blake2/blake2b.o
build/temp.linux-i686-2.7/extras/libargon2/src/core.o
build/temp.linux-i686-2.7/extras/libargon2/src/encoding.o
build/temp.linux-i686-2.7/extras/libargon2/src/opt.o
build/temp.linux-i686-2.7/extras/libargon2/src/thread.o
running build_ext
generating cffi module 'build/temp.linux-i686-2.7/_ffi.c'
building '_ffi' extension
creating build/temp.linux-i686-2.7/build
creating build/temp.linux-i686-2.7/build/temp.linux-i686-2.7
i586-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall
-Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g
-fstack-protector-strong -Wformat -Werror=format-security -fPIC
-Iextras/libargon2/include -I/usr/include/python2.7 -c
build/temp.linux-i686-2.7/_ffi.c -o
build/temp.linux-i686-2.7/build/temp.linux-i686-2.7/_ffi.o
i586-linux-gnu-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions
-Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall
-Wstrict-prototypes -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong
-Wformat -Werror=format-security -Wl,-z,relro -D_FORTIFY_SOURCE=2 -g
-fstack-protector-strong -Wformat -Werror=format-security
build/temp.linux-i686-2.7/build/temp.linux-i686-2.7/_ffi.o
-Lbuild/temp.linux-i686-2.7 -llibargon2 -llibargon2 -o
build/lib.linux-i686-2.7/argon2/_ffi.so

[hynek]

Awesome, thank you for your assistance!