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Maksim Shabunin 4c81e174bf
Merge pull request #25901 from mshabunin:fix-riscv-aarch-baseline 
RISC-V/AArch64: disable CPU features detection #25901

This PR is the first step in fixing current issues with NEON/RVV, FP16, BF16 and other CPU features on AArch64 and RISC-V platforms.

On AArch64 and RISC-V platforms we usually have the platform set by default in the toolchain when we compile it or in the cmake toolchain file or in CMAKE_CXX_FLAGS by user. Then, there are two ways to set platform options: a) "-mcpu=<some_cpu>" ; b) "-march=<arch description>" (e.g. "rv64gcv"). Furthermore, there are no similar "levels" of optimizations as for x86_64, instead we have features (RVV, FP16,...) which can be enabled or disabled. So, for example, if a user has "rv64gc" set by the toolchain and we want to enable RVV. Then we need to somehow parse their current feature set and append "v" (vector optimizations) to this string. This task is quite hard and the whole procedure is prone to errors.

I propose to use "CPU_BASELINE=DETECT" by default on AArch64 and RISC-V platforms. And somehow remove other features or make them read-only/detect-only, so that OpenCV wouldn't add any extra "-march" flags to the default configuration. We would rely only on the flags provided by the compiler and cmake toolchain file. We can have some predefined configurations in our cmake toolchain files.

Changes made by this PR:
- `CMakeLists.txt`: 
  - use `CMAKE_CROSSCOMPILING` instead of `CMAKE_TOOLCHAIN_FILE` to detect cross-compilation. This might be useful in cases of native compilation with a toolchain file
  - removed obsolete variables `ENABLE_NEON` and `ENABLE_VFPV3`, the first one have been turned ON by default on AArch64 platform which caused setting `CPU_BASELINE=NEON`
  - raise minimum cmake version allowed to 3.7 to allow using `CMAKE_CXX_FLAGS_INIT` in toolchain files
- added separate files with arch flags for native compilation on AArch64 and RISC-V, these files will be used in our toolchain files and in regular cmake
- use `DETECT` as default value for `CPU_BASELINE` also allow `NATIVE`, warn user if other values were used (only for AArch64 and RISC-V)
- for each feature listed in `CPU_DISPATCH` check if corresponding `CPU_${opt}_FLAGS_ON` has been provided, warn user if it is empty (only for AArch64 and RISC-V)
- use `CPU_BASELINE_DISABLE` variable to actually turn off macros responsible for corresponding features even if they are enabled by compiler
- removed Aarch64 feature merge procedure (it didn't support `-mcpu` and built-in `-march`)
- reworked AArch64 and two RISC-V cmake toolchain files (does not affect Android/OSX/iOS/Win):
  - use `CMAKE_CXX_FLAGS_INIT` to set compiler flags
  - use variables `ENABLE_BF16`, `ENABLE_DOTPROD`, `ENABLE_RVV`, `ENABLE_FP16` to control `-march`
  - AArch64: removed other compiler and linker flags
    - `-fdata-sections`, `-fsigned-char`, `-Wl,--no-undefined`, `-Wl,--gc-sections`   - already set by OpenCV
    - `-Wa,--noexecstack`, `-Wl,-z,noexecstack`, `-Wl,-z,relro`, `-Wl,-z,now` - can be enabled by OpenCV via `ENABLE_HARDENING`
    - `-Wno-psabi` - this option used to disable some warnings on older ARM platforms, shouldn't harm
  - ARM: removed same common flags as for AArch64, but left `-mthumb` and `--fix-cortex-a8`, `-z nocopyreloc`
2024-09-12 18:07:24 +03:00
.github Force contributors to define Apache 2.0 license for the new PRs. 2024-06-28 16:54:14 +03:00
3rdparty Merge pull request #26113 from FantasqueX:zlib-ng-2-2-1 2024-09-12 16:05:24 +03:00
apps Merge pull request #25582 from fengyuentau:dnn/dump_pbtxt 2024-05-17 11:07:05 +03:00
cmake Merge pull request #25901 from mshabunin:fix-riscv-aarch-baseline 2024-09-12 18:07:24 +03:00
data Merge pull request #22727 from su77ungr:patch-1 2022-11-17 06:54:25 +00:00
doc Update remap tutorial 2024-09-05 16:54:37 +08:00
include exclude opencv_contrib modules 2020-02-26 15:12:45 +03:00
modules Merge pull request #26134 from savuor:rv/mixed_arithm_channels 2024-09-10 13:20:04 +03:00
platforms Merge pull request #25901 from mshabunin:fix-riscv-aarch-baseline 2024-09-12 18:07:24 +03:00
samples Added python branch to stitching tutorial. 2024-08-19 16:28:15 +03:00
.editorconfig add .editorconfig 2018-10-11 17:57:51 +00:00
.gitattributes cmake: generate and install ffmpeg-download.ps1 2018-06-09 13:19:48 +03:00
.gitignore Merge pull request #17165 from komakai:objc-binding 2020-06-08 18:32:53 +00:00
CMakeLists.txt Merge pull request #25901 from mshabunin:fix-riscv-aarch-baseline 2024-09-12 18:07:24 +03:00
CONTRIBUTING.md migration: github.com/opencv/opencv 2016-07-12 12:51:12 +03:00
COPYRIGHT copyright: 2023 (update) 2023-01-09 09:49:22 +00:00
LICENSE Merge pull request #18073 from vpisarev:apache2_license 2020-08-17 11:49:11 +00:00
README.md Space mistake in README.md 2024-03-03 23:37:07 +05:30
SECURITY.md Updated PGP key for security reports 2023-04-19 19:16:55 +03:00

README.md

OpenCV: Open Source Computer Vision Library

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Contributing

Please read the contribution guidelines before starting work on a pull request.

Summary of the guidelines:

  • One pull request per issue;
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  • Include tests and documentation;
  • Clean up "oops" commits before submitting;
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