New issue 2811: ropenssl.py incorrectly assumes presence of comp.h
https://bitbucket.org/pypy/pypy/issues/2811/ropensslpy-incorrectly-assumes-presence-of
Dominyk Tiller:
There's an erroneous assumption in `ropenssl.py` that the OpenSSL header
`comp.h` will always be available, and consequently when that header isn't
available the build can fail:
```
File
"/private/tmp/pypy-20180426-89170-ltfanb/pypy2-v6.0.0-src/rpython/rtyper/tool/rffi_platform.py",
line 844, in configure_external_library
raise last_error
[translation:ERROR] CompilationError: CompilationError(err="""
/private/tmp/pypy-20180426-89170-ltfanb/pypy2-v6.0.0-src/usession-release-pypy2.7-v6.0.0-0/platcheck_77.c:87:10:
fatal error: 'openssl/comp.h' file not found
#include <openssl/comp.h>
^~~~~~~~~~~~~~~~
1 error generated.
""")
```
Whilst it is *usually* available, it is perfectly legitimate to build openssl
with `no-comp` passed during compile, which apparently disables installing that
header entirely. Homebrew, the macOS package manager, has recently switched its
OpenSSL formula to build with `no-comp`, which has revealed this issue.
Normally in C you could wrap the header inclusion in something like `#ifndef
OPENSSL_NO_COMP` but I'm not sure how to achieve that in Python.
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