xref: /freebsd-11.0-release/crypto/openssl/PROBLEMS

* System libcrypto.dylib and libssl.dylib are used by system ld on MacOS X.


    NOTE: The problem described here only applies when OpenSSL isn't built
    with shared library support (i.e. without the "shared" configuration
    option).  If you build with shared library support, you will have no
    problems as long as you set up DYLD_LIBRARY_PATH properly at all times.


This is really a misfeature in ld, which seems to look for .dylib libraries
along the whole library path before it bothers looking for .a libraries.  This
means that -L switches won't matter unless OpenSSL is built with shared
library support.

The workaround may be to change the following lines in apps/Makefile.ssl and
test/Makefile.ssl:

  LIBCRYPTO=-L.. -lcrypto
  LIBSSL=-L.. -lssl

to:

  LIBCRYPTO=../libcrypto.a
  LIBSSL=../libssl.a

It's possible that something similar is needed for shared library support
as well.  That hasn't been well tested yet.


Another solution that many seem to recommend is to move the libraries
/usr/lib/libcrypto.0.9.dylib, /usr/lib/libssl.0.9.dylib to a different
directory, build and install OpenSSL and anything that depends on your
build, then move libcrypto.0.9.dylib and libssl.0.9.dylib back to their
original places.  Note that the version numbers on those two libraries
may differ on your machine.


As long as Apple doesn't fix the problem with ld, this problem building
OpenSSL will remain as is.


* Parallell make leads to errors

While running tests, running a parallell make is a bad idea.  Many test
scripts use the same name for output and input files, which means different
will interfere with each other and lead to test failure.

The solution is simple for now: don't run parallell make when testing.


* Bugs in gcc 3.0 triggered

According to a problem report, there are bugs in gcc 3.0 that are
triggered by some of the code in OpenSSL, more specifically in
PEM_get_EVP_CIPHER_INFO().  The triggering code is the following:

	header+=11;
	if (*header != '4') return(0); header++;
	if (*header != ',') return(0); header++;

What happens is that gcc might optimize a little too agressively, and
you end up with an extra incrementation when *header != '4'.

We recommend that you upgrade gcc to as high a 3.x version as you can.

* solaris64-sparcv9-cc SHA-1 performance with WorkShop 6 compiler.

As subject suggests SHA-1 might perform poorly (4 times slower)
if compiled with WorkShop 6 compiler and -xarch=v9. The cause for
this seems to be the fact that compiler emits multiplication to
perform shift operations:-( To work the problem around configure
with './Configure solaris64-sparcv9-cc -DMD32_REG_T=int'.

* Problems with hp-parisc2-cc target when used with "no-asm" flag

When using the hp-parisc2-cc target, wrong bignum code is generated.
This is due to the SIXTY_FOUR_BIT build being compiled with the +O3
aggressive optimization.
The problem manifests itself by the BN_kronecker test hanging in an
endless loop. Reason: the BN_kronecker test calls BN_generate_prime()
which itself hangs. The reason could be tracked down to the bn_mul_comba8()
function in bn_asm.c. At some occasions the higher 32bit value of r[7]
is off by 1 (meaning: calculated=shouldbe+1). Further analysis failed,
as no debugger support possible at +O3 and additional fprintf()'s
introduced fixed the bug, therefore it is most likely a bug in the
optimizer.
The bug was found in the BN_kronecker test but may also lead to
failures in other parts of the code.
(See Ticket #426.)

Workaround: modify the target to +O2 when building with no-asm.

* Poor support for AIX shared builds.

do_aix-shared rule is not flexible enough to parameterize through a
config-line. './Configure aix43-cc shared' is working, but not
'./Configure aix64-gcc shared'. In latter case make fails to create shared
libraries. It's possible to build 64-bit shared libraries by running
'env OBJECT_MODE=64 make', but we need more elegant solution. Preferably one
supporting even gcc shared builds. See RT#463 for background information.