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57 lines
2.2 KiB
Diff
57 lines
2.2 KiB
Diff
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From d836f008a96aa9b2e88c7b394bfc110542e57176 Mon Sep 17 00:00:00 2001
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From: Khem Raj <raj.khem@gmail.com>
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Date: Fri, 4 Aug 2023 09:34:50 -0700
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Subject: [PATCH] aarch64/configure: Pass -mcpu along with -march to detect sve
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support
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SVE support logic in configure is rightly passing -march=<arch>+sve to
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compiler to override whatever user might have passed via environment,
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however GCC does not do as intended when -mcpu is part of environment
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compiler flags, then it overrides the -march computed from -mcpu and
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igonores other -march values so this test fails for lot of aarch64
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machines which pass -mcpu that does not support sve. This is seemingly a
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bug in GCC [1], until that is fixed we preempt -mcpu along with -march
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in the configure test itself. It does not change functionality and yet
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lets us through the GCC inconsistency.
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[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110901
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Upstream-Status: Inappropriate [Workaround for a GCC issue]
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Signed-off-by: Khem Raj <raj.khem@gmail.com>
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Signed-off-by: Khem Raj <raj.khem@gmail.com>
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---
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sysdeps/aarch64/configure | 2 +-
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sysdeps/aarch64/configure.ac | 2 +-
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2 files changed, 2 insertions(+), 2 deletions(-)
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diff --git a/sysdeps/aarch64/configure b/sysdeps/aarch64/configure
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index 5e91fab023..39dddc66d4 100644
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--- a/sysdeps/aarch64/configure
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+++ b/sysdeps/aarch64/configure
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@@ -327,7 +327,7 @@ else $as_nop
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cat > conftest.s <<\EOF
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ptrue p0.b
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EOF
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-if { ac_try='${CC-cc} -c -march=armv8.2-a+sve conftest.s 1>&5'
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+if { ac_try='${CC-cc} -c -mcpu=generic+sve -march=armv8.2-a+sve conftest.s 1>&5'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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diff --git a/sysdeps/aarch64/configure.ac b/sysdeps/aarch64/configure.ac
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index 8a708f2ef4..b6a146d2be 100644
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--- a/sysdeps/aarch64/configure.ac
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+++ b/sysdeps/aarch64/configure.ac
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@@ -92,7 +92,7 @@ AC_CACHE_CHECK([for SVE support in assembler], [libc_cv_aarch64_sve_asm], [dnl
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cat > conftest.s <<\EOF
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ptrue p0.b
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EOF
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-if AC_TRY_COMMAND(${CC-cc} -c -march=armv8.2-a+sve conftest.s 1>&AS_MESSAGE_LOG_FD); then
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+if AC_TRY_COMMAND(${CC-cc} -c -mcpu=generic+sve -march=armv8.2-a+sve conftest.s 1>&AS_MESSAGE_LOG_FD); then
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libc_cv_aarch64_sve_asm=yes
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else
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libc_cv_aarch64_sve_asm=no
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--
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2.41.0
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