47 lines
1.8 KiB
Diff
47 lines
1.8 KiB
Diff
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From 94cda9cc8cd12345a6dbe70e40f3119d5bf7ee78 Mon Sep 17 00:00:00 2001
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From: Julien Olivain <ju.o@free.fr>
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Date: Fri, 10 Feb 2023 21:25:36 +0100
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Subject: [PATCH] Fix compilation for armv7 with gcc < 8
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Highway uses the construct __attribute__((target(+neon-vfpv4)) for
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Armv7. The target "+neon-vfpv4" was introduced in gcc 8, in commit [1].
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When using a gcc < 8 (for example, like [2]), compilation fails with
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message:
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In file included from /build/highway-1.0.3/hwy/foreach_target.h:81:0,
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from /build/highway-1.0.3/hwy/per_target.cc:20:
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/build/highway-1.0.3/hwy/per_target.cc: At global scope:
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/build/highway-1.0.3/hwy/per_target.cc:23:22: error: attribute(target("+neon-vfpv4")) is unknown
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This commit protects the definition of HWY_TARGET_STR only when gcc
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version 8 or greater is used for armv7.
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[1] https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=e87afe54b86c478ae63569e51e7abb67d3fe3fce
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[2] https://releases.linaro.org/components/toolchain/binaries/7.3-2018.05/arm-linux-gnueabihf/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf.tar.xz
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Signed-off-by: Julien Olivain <ju.o@free.fr>
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---
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hwy/ops/set_macros-inl.h | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/hwy/ops/set_macros-inl.h b/hwy/ops/set_macros-inl.h
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index 051dbb3..00b4b1b 100644
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--- a/hwy/ops/set_macros-inl.h
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+++ b/hwy/ops/set_macros-inl.h
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@@ -230,7 +230,12 @@
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// Can use pragmas instead of -march compiler flag
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#if HWY_HAVE_RUNTIME_DISPATCH
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#if HWY_ARCH_ARM_V7
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+#if HWY_COMPILER_GCC_ACTUAL >= 800
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+// The __attribute__((target(+neon-vfpv4)) was introduced in gcc >= 8.
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+// In case we have a gcc < 8, we can still compile by keeping
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+// HWY_TARGET_STR undefined.
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#define HWY_TARGET_STR "+neon-vfpv4"
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+#endif
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#else
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#define HWY_TARGET_STR "+crypto"
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#endif // HWY_ARCH_ARM_V7
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--
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2.39.2
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