incorrect AMD math library link order

[Max R. Dechantsreiter]

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# -------------------------------------------------------
# Build PnetCDF using OpenMPI 5.0.2 built with AOCC 4.2.0
# -------------------------------------------------------
#
#      https://parallel-netcdf.github.io/
#      https://parallel-netcdf.github.io/wiki/Download.html
#
# [Times below are for building on Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz]

# Start time
SECONDS=0

PROJECT=$HOME/AOCC

# -------------------------------
# Set environment for build tools
# -------------------------------

# AOCC

AOCC_VERSION=4.2.0 # 2024-02-27
AOCC=aocc-$AOCC_VERSION

PROJECT_AOCC=$PROJECT/opt/amd/aocc/$AOCC_VERSION
source $PROJECT_AOCC/bin/setenv_AOCC.sh

# AOCL

AOCL_VERSION=$AOCC_VERSION

PROJECT_AOCL=$PROJECT/opt/amd/aocl/$AOCL_VERSION/aocc
source $PROJECT_AOCL/amd-libs.cfg

# Facilitate use of AMD libm

export LD_LIBRARY_PATH=$PROJECT_AOCC/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}

# AND link with '-lamdlibm -lm' instead of '-lm'

# OpenMPI

OMPI_VERSION=5.0.2 # 2024-02-06
OMPI=openmpi-${OMPI_VERSION}_$AOCC

HWLOC_VERSION=2.10.0 # 2023-12-04
HWLOC=hwloc-${HWLOC_VERSION}_$AOCC

PROJECT_OMPI=$PROJECT/opt/amd/ompi

CPATH=$PROJECT_OMPI/$HWLOC/include${CPATH:+:$CPATH}
PATH=$PROJECT_OMPI/$HWLOC/bin${PATH:+:$PATH}
LD_LIBRARY_PATH=$PROJECT_OMPI/$HWLOC/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}

CPATH=$PROJECT_OMPI/$OMPI/include${CPATH:+:$CPATH}
PATH=$PROJECT_OMPI/$OMPI/bin${PATH:+:$PATH}
LD_LIBRARY_PATH=$PROJECT_OMPI/$OMPI/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}

export CPATH PATH LD_LIBRARY_PATH
export HWLOC_ALLOW=all # VPS workaround

# Set environment for other build tools

#MAKE=gmake
MAKE=make # Linux make is gmake
export MAKEFLAGS="V=1 -j1"

# Check build tools

clang --version | grep AMD

gcc --version | grep gcc

ompi_info | grep "Open MPI:"

make --version | grep Make

# Build PnetCDF

PNETCDF_VERSION=1.13.0.rc1
PNETCDF=pnetcdf-$PNETCDF_VERSION

ARCHIVE=$PROJECT/Archive
BUILD=$PROJECT/Build
LIB=$PROJECT/opt/amd/lib

mkdir -p $ARCHIVE $BUILD $LIB

# Set installation directory

PREFIX=$LIB/$PNETCDF

# Download source

cd $ARCHIVE

PNETCDF_TAR_GZ=$PNETCDF.tar.gz
if [ ! -f "$PNETCDF_TAR_GZ" ]; then
	#wget https://parallel-netcdf.github.io/Release/$PNETCDF_TAR_GZ
	wget https://github.com/Parallel-NetCDF/Parallel-NetCDF.github.io/raw/master/Release/$PNETCDF_TAR_GZ
fi

cd $BUILD
tar xzf $ARCHIVE/$PNETCDF_TAR_GZ
cd $BUILD/$PNETCDF

# Build PnetCDF

export CPP='clang -E'
export CXXCPP='clang++ -E'
#
export MPICC=mpicc
export MPICXX=mpicxx
export MPIF77=mpifort
export MPIF90=mpif90
#
ARCH='-march=broadwell -mtune=broadwell'
#
#FLAGS="$ARCH -O3 -ip -no-prec-div -static-intel" # recommended by Intel (ICC)
FLAGS="$ARCH -O3 -freciprocal-math"
FLAGS="$FLAGS -fPIC" # required by NetCDF4 build
#
export CFLAGS=$FLAGS
export CXXFLAGS=$FLAGS
export FCFLAGS=$FLAGS
export FFLAGS=$FLAGS
export LDFLAGS=$FLAGS
#
export LIBS='-lamdlibm'
#
time ./configure --prefix=$PREFIX \
	--enable-fortran --enable-cxx --enable-mpi-io-test \
	>& configure.log # ~42s
time make >& make.log # ~5m18s
make install >& make_install.log
#
# (Result is $PREFIX/lib/libpnetcdf.a - no shared library)