Failure on ppc64 when cross compiled with gcc-11 toolchain

[joanaxcruz]

When I try to cross-compile sleef for ppc64el with gcc toolchain (using the following command):

CROSS_ARCH=ppc64el
COMPILER=gcc
 QEMU_EMULATOR=qemu-ppc64le
 export QEMU_CPU=power10
cmake -S . -B build-${CROSS_ARCH}-${COMPILER} \
    -DCMAKE_TOOLCHAIN_FILE=$PWD/toolchains/${CROSS_ARCH}-${COMPILER}.cmake \
    -DNATIVE_BUILD_DIR=$PWD/native-build-${COMPILER} \
    -DEMULATOR=${QEMU_EMULATOR} \
    ${COMMON_CMAKE_CFLAGS} \
    ${EXTRA_CMAKE_FLAGS} 

cmake --build build-${CROSS_ARCH}-${COMPILER}  --clean-first

ctest --output-on-failure --test-dir build-${CROSS_ARCH}-${COMPILER} 

Get the following failure:

1/21 Test #21: iutscalar ........................***Failed 1.01 sec *** Now testing /home/joacru01/sleef/build-ppc64el-gcc/bin/iutscalar sqrtf_u35 denormal/nonnumber test : arg = 0, test = -0, correct = 0

I believe this is not shown in GHA tests due to different interactions of qemu and the test suite (I pass the emulator through cmake, while qemu is built in the docker used in GHA). Still worth an investigation I believe...