I have installed the "gcc-core" package:
$ gcc --version
gcc (GCC) 4.9.3
Using this file:
http://gcc.gnu.org/git?p=gcc.git;a=blob;f=gcc/testsuite/c-c%2B%2B-common/ubsan/undefined-1.c;hb=382ecb
and this command:
gcc -fsanitize=undefined undefined-1.c
yields this result:
/usr/lib/gcc/x86_64-pc-cygwin/4.9.3/../../../../x86_64-pc-cygwin/bin/ld:
cannot find -lubsan
collect2: error: ld returned 1 exit status
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