`zgerc` test fails when built with `-march=armv8.2-a+fcma`

[ggardet]

zgerc test fails when built with -march=armv9-a. I can reproduce with -march=armv8.2-a+fcma but not with -march=armv8.2.
Base system is openSUSE Tumbleweed aarch64.

Test error:

[  104s] ./cblas/test.log
[  104s] FAIL: zgerc(case 1399) real (0.0497239999999999349 observed vs 0.0605740000000000028 expected) [2892]
[  104s] FAIL: zgerc(case 1399) imag (0.906070000000000042 observed vs 0.865539999999999976 expected) [2893]
[  104s] FAIL test (exit status: 1)
[  104s] ./cblas/test-suite.log
[  104s] ===================================
[  104s]    gsl 2.8: cblas/test-suite.log
[  104s] ===================================
[  104s] 
[  104s] # TOTAL: 1
[  104s] # PASS:  0
[  104s] # SKIP:  0
[  104s] # XFAIL: 0
[  104s] # FAIL:  1
[  104s] # XPASS: 0
[  104s] # ERROR: 0
[  104s] 
[  104s] System information (uname -a): Linux 6.16.5-1-default #1 SMP PREEMPT_DYNAMIC Thu Sep 4 15:51:43 UTC 2025 (642f24d) aarch64 aarch64 aarch64
[  104s] 
[  104s] .. contents:: :depth: 2
[  104s] 
[  104s] FAIL: test
[  104s] ==========
[  104s] 
[  104s] FAIL: zgerc(case 1399) real (0.0497239999999999349 observed vs 0.0605740000000000028 expected) [2892]
[  104s] FAIL: zgerc(case 1399) imag (0.906070000000000042 observed vs 0.865539999999999976 expected) [2893]
[  104s] FAIL test (exit status: 1)

Configure log:

[   25s] + export 'CFLAGS=-mbranch-protection=standard -march=armv9-a -O2 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type -flto=auto -g'
[   25s] + CFLAGS='-mbranch-protection=standard -march=armv9-a -O2 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type -flto=auto -g'
[   25s] + CONFIG_SHELL=/usr/bin/bash
[   25s] + export CONFIG_SHELL
[   25s] + CFLAGS='-mbranch-protection=standard -march=armv9-a -O2 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type -flto=auto -g'
[   25s] + export CFLAGS
[   25s] + CXXFLAGS='-mbranch-protection=standard -march=armv9-a -O2 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type -flto=auto -g'
[   25s] + export CXXFLAGS
[   25s] + FFLAGS='-mbranch-protection=standard -march=armv9-a -O2 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type -flto=auto -g '
[   25s] + export FFLAGS
[   25s] + FCFLAGS='-mbranch-protection=standard -march=armv9-a -O2 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type -flto=auto -g '
[   25s] + export FCFLAGS
[   25s] + LDFLAGS=-flto=auto
[   25s] + export LDFLAGS
[   25s] + ./configure --host=aarch64-suse-linux --build=aarch64-suse-linux --program-prefix= --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info --disable-static --enable-shared --with-gnu-ld