On Mon, Dec 12, 2016 at 11:49 AM, <pdohe...@cipherloc.net> wrote:
> So just as a sanity check, I decided to pull the cryptopp lib out by itself
> and see if I could use that by itself to make sure that the changes I had
> made before didn't mess with that library. It does not work however and I
> get completely different errors. When trying to use cryptopp on its own, I
> get missing symbols for CryptoPP::AlignedAllocate(unsgined long) and
> CryptoPP::AlignedDeallocate(void*). AlignedAllocate is referenced from
> AllocatorwithCleanup<unsigned char, true>::allocate(unsigned long, void
> const*) and AlignedDeallocate is referenced from
> AllocatorWithCleanup<unsigned char, true>::deallocate(void*, unsigned long).
> The library is built for the right architecture I am testing on, I checked
> this with lipo -info. I am also using objective C as the language for this
> test if that makes a difference, although I do not think it does. Any ideas
> on that one?
This happens when the library is built with non-SSE and non-NEON
support. AlignedAllocate are AlignedDeallocate are used for 16-byte
aligned allocations. The aligned data buffers are eventually sent to
the SIMD (SSE) or ASIMD (ARM) coprocessors. Use of SSE and NEON can be
disabled with -DCRYPTOPP_DISABLE_ASM, which means AlignedAllocate are
AlignedDeallocate are not needed.
I usually see it surface under MinGW32 because they {are|were}
building Crypto++ with -DCRYPTOPP_DISABLE_ASM. Later, a user would
come along and not include -DCRYPTOPP_DISABLE_ASM in their CXXFLAGS.
So users wanted AlignedAllocate are AlignedDeallocate, but the library
was shipped without them.
When I use setenv-ios.sh to build the library from the latest sources,
I get the symbol. The 'T' section is the text section, which means the
symbols are present in the library.
cryptopp-arm64$ xcrun -sdk iphoneos lipo -info libcryptopp.a
input file libcryptopp.a is not a fat file
Non-fat file: libcryptopp.a is architecture: arm64
cryptopp-arm64$ nm libcryptopp.a | c++filt | egrep
'(AlignedAllocate|AlignedDeallocate)' | grep ' T '
0000000000000400 T CryptoPP::AlignedAllocate(unsigned long)
0000000000000430 T CryptoPP::AlignedDeallocate(void*)
I also performed the exercise for Crypto++ 5.6.4 and 5.6.5, and the
symbols are present too. So its not like there are strings attached to
get the symbols.
It may be worth noting.... Crypto++ 5.6.3 and earlier used
-DCRYPTOPP_DISABLE_ASM for Clang. It took Uri and I several months to
get the compiler and integrated assembler issues worked out. We could
not remove -DCRYPTOPP_DISABLE_ASM until 5.6.4.
It sounds like (to me) the Xcode project is not quite right.
Jeff
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