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1 # Force the system (Xcode) C/C++ compilers when building on macOS hosts.
2 # This avoids picking up Android NDK toolchains from the shell environment.
3 [env]
4 CXX = { value = "/usr/bin/clang++", force = true }
5 CC = { value = "/usr/bin/clang", force = true }
6 MACOSX_DEPLOYMENT_TARGET = { value = "14.0", force = true }
7
8 # iOS / tvOS builds of `gemm-f16` require ARM full FP16 support for inline
9 # NEON instructions like:
10 # fmul v0.8h, v1.8h, v2.8h
11 # fmla v0.8h, v1.8h, v2.h[0]
12 # Without `+fullfp16`, LLVM/Rust rejects those instructions with:
13 # error: instruction requires: fullfp16
14 #
15 # `+fp16` alone is not sufficient here — `gemm-common` uses arithmetic vector
16 # half-precision instructions that specifically require `fullfp16`.
17
18 [target.aarch64-apple-darwin]
19 rustflags = ["-C", "link-arg=-mmacosx-version-min=14.0"]
20
21 [target.x86_64-apple-darwin]
22 rustflags = ["-C", "link-arg=-mmacosx-version-min=14.0"]
23
24 [target.aarch64-apple-ios]
25 rustflags = ["-C", "target-feature=+fullfp16,+fp16"]
26
27 [target.aarch64-apple-ios-sim]
28 rustflags = ["-C", "target-feature=+fullfp16,+fp16"]
29
30 [target.aarch64-apple-tvos]
31 rustflags = ["-C", "target-feature=+fullfp16,+fp16"]
32
33 [target.aarch64-apple-tvos-sim]
34 rustflags = ["-C", "target-feature=+fullfp16,+fp16"]
35
36 [target.x86_64-apple-tvos]
37 rustflags = ["-C", "target-feature=+fullfp16,+fp16"]
38
39 # Android arm64-v8a hits the same `gemm-common` fp16 NEON path as iOS. The
40 # aarch64 inline asm (`fmla v0.8h, ...`) requires `fullfp16`, which the default
41 # `aarch64-linux-android` target does not enable. gemm still runtime-detects the
42 # CPU feature, so enabling it here only allows the instructions to assemble.
43 # Only aarch64 needs this; the armv7/x86/x86_64 Android targets never compile
44 # the aarch64-gated fp16 SIMD module.
45 [target.aarch64-linux-android]
46 rustflags = ["-C", "target-feature=+fullfp16,+fp16"]