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55 lines
2.0 KiB
55 lines
2.0 KiB
1 month ago
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commit 395a89f61e19fa916ae4cc93fc10d81a28ce3039
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Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
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Date: Wed Mar 13 14:34:14 2024 +0000
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aarch64: fix check for SVE support in assembler
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Due to GCC bug 110901 -mcpu can override -march setting when compiling
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asm code and thus a compiler targetting a specific cpu can fail the
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configure check even when binutils gas supports SVE.
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The workaround is that explicit .arch directive overrides both -mcpu
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and -march, and since that's what the actual SVE memcpy uses the
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configure check should use that too even if the GCC issue is fixed
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independently.
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Reviewed-by: Florian Weimer <fweimer@redhat.com>
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(cherry picked from commit 73c26018ed0ecd9c807bb363cc2c2ab4aca66a82)
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diff --git a/sysdeps/aarch64/configure b/sysdeps/aarch64/configure
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old mode 100644
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new mode 100755
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index ca57edce472e4507..9606137e8ddae545
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--- a/sysdeps/aarch64/configure
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+++ b/sysdeps/aarch64/configure
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@@ -325,9 +325,10 @@ then :
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printf %s "(cached) " >&6
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else $as_nop
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cat > conftest.s <<\EOF
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- ptrue p0.b
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+ .arch armv8.2-a+sve
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+ ptrue p0.b
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EOF
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-if { ac_try='${CC-cc} -c -march=armv8.2-a+sve conftest.s 1>&5'
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+if { ac_try='${CC-cc} -c conftest.s 1>&5'
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{ { eval echo "\"\$as_me\":${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 27874eceb44911e4..56d12d661d726892 100644
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--- a/sysdeps/aarch64/configure.ac
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+++ b/sysdeps/aarch64/configure.ac
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@@ -90,9 +90,10 @@ LIBC_CONFIG_VAR([aarch64-variant-pcs], [$libc_cv_aarch64_variant_pcs])
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# Check if asm support armv8.2-a+sve
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AC_CACHE_CHECK([for SVE support in assembler], [libc_cv_aarch64_sve_asm], [dnl
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cat > conftest.s <<\EOF
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- ptrue p0.b
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+ .arch armv8.2-a+sve
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+ ptrue p0.b
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EOF
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-if AC_TRY_COMMAND(${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 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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