So it looks like sed added a '\r' between the closing paren and the semi. Grepping for '^;' failed because the '\r' was considered part of the previous line, so it showed no hits. I finally had to write a C program to properly identify and fix those damn stray semicolons.
Andy advised against removing the global caps variable. This commit reintroduces CRYPTOGAMS_armcap_P. However, due to the shared object symbol loading problem, we needed to use CRYPTOGAMS_armcap_P as a global, and not CRYPTOGAMS_armcap as a local. Using CRYPTOGAMS_armcap_P directly caused the symbol to be marked as R_ARM_ABS32 which avoids the problem with R_ARM_REL32.
This fixes the query under Clang. This appears to be a trickier problem because there is no explicit define for HWCAP_ARMv7. We rely on HWCAP_NEON as a proxy, or fallback to a CPU_ProbeARMv7.
Some comments in config.h were old. Time for a refresh.
Switch from CRYPTOPP_BOOL_ARM64 to CRYPTOPP_BOOL_ARMV8. Aarch32 is ARMv8, and that's the important part.
Fix two compilation errors encountered with C++Builder (Starter Edition):
- In `cpu.cpp`, 0ccdc197b introduced a dependency on `_xgetbv()` from `<immintrin.h>` that doesn't exist on C++Builder. Enlist it for the workaround, similar to SunCC in 692ed2a2b.
- In `adv-simd.h`, `<pmmintrin.h>` is being #included under the `CRYPTOPP_SSE2_INTRIN_AVAILABLE` macro. This header, [which apparently provides SSE3 intrinsics](https://stackoverflow.com/a/11228864/1433768), is not shipped with C++Builder. (This section of code was recently downgraded from a SSSE3 to a SSE2 block in 09c8ae28, followed by moving away from `<immintrin.h>` in bc8da71a, followed by reintroducing the SSSE3 check in d1e646a5.) Split the SSE2 and SSSE3 cases such that `<pmmintrin.h>` is not #included for SSE2. This seems safe to do, because some `git grep` analysis shows that:
- `adv-simd.h` is not #included by any other header, but only directly #included by some `.cpp` files.
- Among those `.cpp` files, only `sm4-simd.cpp` has a `CRYPTOPP_SSE2_INTRIN_AVAILABLE` preprocessor block, and there it again includes the other two headers (`<emmintrin.h>` and `<xmmintrin.h>`).
NOTE: I was compiling via the IDE after [setting up a project file](https://github.com/tanzislam/cryptopals/wiki/Importing-into-Embarcadero-C%E2%94%BC%E2%94%BCBuilder-Starter-10.2#using-the-crypto-library). My compilation command was effectively:
```
bcc32c.exe -DCRYPTOPP_NO_CXX11 -DCRYPTOPP_DISABLE_SSSE3 -D__SSE2__ -D__SSE__ -D__MMX__
```
This PR adds ARMv8.4 cpu feature detection support. Previously we only needed ARMv8.1 and things were much easier. For example, ARMv8.1 `__ARM_FEATURE_CRYPTO` meant PMULL, AES, SHA-1 and SHA-256 were available. ARMv8.4 `__ARM_FEATURE_CRYPTO` means PMULL, AES, SHA-1, SHA-256, SHA-512, SHA-3, SM3 and SM4 are available.
We still use the same pattern as before. We make something available based on compiler version and/or preprocessor macros. But this time around we had to tighten things up a bit to ensure ARMv8.4 did not cross-pollinate down into ARMv8.1.
ARMv8.4 is largely untested at the moment. There is no hardware in the field and CI lacks QEMU with the relevant patches/support. We will probably have to revisit some of this stuff in the future.
Since this update applies to ARM gadgets we took the time to expand Android and iOS testing on Travis. Travis now tests more platforms, and includes Autotools and CMake builds, too.
There are no corresponding defines in config.h at the moment. Programs will have to use the preprocessor macros __AVX__ and __AVX2__ to determine when they are available.
It looks like the 0 return value for _SC_LEVEL1_DCACHE_LINESIZE is not a 1-off problem with PPC. It appears Glibc regularly returns 0 instead of failure. Also see https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/posix/sysconf.c.
We were OK before the change. The difference now is, we expect all Glibc queries to misbehave
