On linux-aarch64 with old assembler will make fails "Error: unknown pseudo-op: `.variant_pcs'", shows as below:

# cat sve.c
#include <arm_sve.h>
int main()
{
  svint32_t r = svdup_n_s32(1);
  return 0;
}
svfloat64_t a() {}

# gcc -O3 -march=armv8-a+sve sve.c
/tmp/ccnSNZVG.s: Assembler messages:
/tmp/ccnSNZVG.s:21: Error: unknown pseudo-op: `.variant_pcs'


The JDK compilation fails snippet:
* For target support_native_jdk.incubator.vector_libsleef_static_vector_math_sve.o:
{standard input}: Assembler messages:
{standard input}:7: Error: unknown pseudo-op: `.variant_pcs'
{standard input}:295: Error: unknown pseudo-op: `.variant_pcs'
{standard input}:581: Error: unknown pseudo-op: `.variant_pcs'

gcc version:
# which gcc ; gcc -v
/usr/bin/gcc
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/aarch64-linux-gnu/10/lto-wrapper
Target: aarch64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 10.3.0-1ubuntu1~18.04~1' --with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-10 --program-prefix=aarch64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libquadmath --disable-libquadmath-support --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --enable-fix-cortex-a53-843419 --disable-werror --enable-checking=release --build=aarch64-linux-gnu --host=aarch64-linux-gnu --target=aarch64-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.3.0 (Ubuntu 10.3.0-1ubuntu1~18.04~1)

AS version:
# which as ; as --version
/usr/bin/as
GNU assembler (GNU Binutils for Ubuntu) 2.30
Copyright (C) 2018 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or later.
This program has absolutely no warranty.
This assembler was configured for a target of `aarch64-linux-gnu'.