This is not reproducible, but here's the report anyway:
I upgraded a Windows 10 system from Cygwin 3.5.3 to 3.5.5 today.
Then ran the configure script of a tarball (*), and it hung:
$ mkdir build-cygwin64
$ cd build-cygwin64
$ ../configure --host=x86_64-pc-cygwin --prefix=/usr/local/cygwin64
CC=x86_64-pc-cygwin-gcc CXX=x86_64-pc-cygwin-g++
CPPFLAGS="-I/usr/local/cygwin64/include -Wall"
LDFLAGS=-L/usr/local/cygwin64/lib -C --with-included-libunistring 2>&1 | tee
log1
...
checking whether snprintf fully supports the 'n' directive... (cached) yes
checking whether snprintf respects a size of 1... (cached) yes
checking whether vsnprintf respects a zero size as in C99... (cached) yes
checking whether btowc is declared without a macro... yes
checking whether wctob is declared without a macro... yes
checking whether mbsinit is declared without a macro... yes
checking whether mbrtowc is declared without a macro... yes
<hangs>
Typing Ctrl-C in said mintty window has no effect.
(*) generated in a gnulib checkout on Linux, through
$ ./gnulib-tool --create-testdir --dir=../testdir-all --with-c++-tests
--without-privileged-tests --single-configure `./all-modules`
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