It looks like ssp doesn't actually work on cygwin. We should fix the ssp test so it includes studio.h and fails. ``` configure:10546: checking whether the compiler accepts -fstack-protector-all configure:10565: gcc -c -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -pedantic -Werror -fstack-protector-all -I${top_srcdir}/src/common conftest.c >&5 configure:10565: $? = 0 configure:10584: gcc -o conftest.exe -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -pedantic -Werror -fstack-protector-all -I${top_srcdir}/src/common conftest.c >&5 configure:10584: $? = 0 configure:10596: result: yes configure:10622: checking whether the compiler accepts -Wstack-protector configure:10641: gcc -c -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-all -pedantic -Werror -Wstack-protector -I${top_srcdir}/src/common conftest.c >&5 configure:10641: $? = 0 configure:10672: result: yes configure:10685: checking whether the compiler accepts --param ssp-buffer-size=1 configure:10704: gcc -c -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-all -Wstack-protector -pedantic -Werror --param ssp-buffer-size=1 -I${top_srcdir}/src/common conftest.c >&5 configure:10704: $? = 0 configure:10735: result: yes configure:10749: checking whether the compiler accepts -fPIE configure:10768: gcc -c -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-all -Wstack-protector --param ssp-buffer-size=1 -pedantic -Werror -fPIE -I${top_srcdir}/src/common conftest.c >&5 configure:10768: $? = 0 configure:10799: result: yes configure:10811: checking whether the linker accepts -pie configure:10854: gcc -o conftest.exe -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-all -Wstack-protector --param ssp-buffer-size=1 -fPIE -pedantic -Werror -I${top_srcdir}/src/common -pie conftest.c -lz -levent -lssl -lcrypto >&5 In file included from /usr/include/stdio.h:800, from conftest.c:78: /usr/local/lib/gcc/x86_64-unknown-cygwin/8.1.0/include/ssp/stdio.h:38:10: fatal error: ssp.h: No such file or directory #include <ssp.h> ^~~~~~~ compilation terminated. configure:10854: $? = 1 configure: program exited with status 1 configure: failed program was: | /* confdefs.h */ | #define PACKAGE_NAME "tor" | #define PACKAGE_TARNAME "tor" | #define PACKAGE_VERSION "0.3.3.7" (similar macros) | #define STDC_HEADERS 1 | #define HAVE_SYS_TYPES_H 1 (similar macros) | /* end confdefs.h. */ | #include <stdio.h> | int | main () | { | fputs("", stdout) | ; | return 0; | } configure:10868: result: no ```