[tor-bugs] #26460 [Core Tor/Tor]: All autoconf tests that include studio.h fail with a missing ssp.h on cygwin

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#26460: All autoconf tests that include studio.h fail with a missing ssp.h on
cygwin
--------------------------------------+------------------------------------
 Reporter:  teor                      |          Owner:  (none)
     Type:  defect                    |         Status:  needs_information
 Priority:  Medium                    |      Milestone:  Tor: 0.3.4.x-final
Component:  Core Tor/Tor              |        Version:  Tor: 0.3.3.1-alpha
 Severity:  Normal                    |     Resolution:
 Keywords:  regression, 033-backport  |  Actual Points:
Parent ID:  #26356                    |         Points:
 Reviewer:                            |        Sponsor:
--------------------------------------+------------------------------------
Changes (by teor):

 * status:  new => needs_information


Comment:

 Ok, so I think your preprocessor is broken.
 About half the time, it falils when including ssp.h. And the rest of the
 time, it succeeds.

 {{{
 configure:10878: checking whether the compiler accepts -fwrapv
 configure:10897: gcc -c -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2
 -fstack-protector-all -Wstack-protector --param ssp-buffer-size=1 -fPIE
 -pedantic -Werror -fwrapv  -I${top_srcdir}/src/common conftest.c >&5
 configure:10897: $? = 0
 configure:10916: gcc -o conftest.exe -g -O2 -U_FORTIFY_SOURCE
 -D_FORTIFY_SOURCE=2 -fstack-protector-all -Wstack-protector --param ssp-
 buffer-size=1 -fPIE -pedantic -Werror -fwrapv  -I${top_srcdir}/src/common
 conftest.c  >&5
 configure:10916: $? = 0
 configure:10928: result: yes
 configure:11284: checking whether the linker accepts -z relro -z now
 configure:11327: gcc -o conftest.exe -g -O2 -U_FORTIFY_SOURCE
 -D_FORTIFY_SOURCE=2 -fstack-protector-all -Wstack-protector --param ssp-
 buffer-size=1 -fPIE -pedantic -Werror  -I${top_srcdir}/src/common     -z
 relro -z now 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:11327: $? = 1
 configure: program exited with status 1
 configure: failed program was:

 (similar to the last one)
 }}}

 Please try re-running configure, after deleting the config cache.
 Then run a diff between the two logs.

 If there are a lot of differences between the logs, then your preprocessor
 is failing on arbitrary inputs.
 If the logs are identical, it's failing based on some characteristic of
 the input files.

 Please also retry running configure with stack smashing protection off.

 Then, please make sure you have enough available file descriptors, disk
 space, RAM, etc., then reinstall Cygwin, and try again.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26460#comment:2>
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