Switch build system from Intel oneAPI to GCC + OpenMPI

- Replace compilers: ifx→gfortran, icx→gcc, icpx→g++, mpiicpx→mpicxx
- Replace flags: -xHost→-march=x86-64-v4, -ipo→-flto, -fpp→-cpp
- Replace flags: -fp-model fast=2→-ffast-math, -fma→-mfma
- Replace flags: -qopenmp→-fopenmp
- Remove Intel-specific: -align array64byte, -liomp5, -lifcore, -limf
- Switch MKL interface: -lmkl_intel_lp64→-lmkl_gf_lp64 (gfortran)
- Replace TBB malloc with optional jemalloc (default off)
- Disable PGO entirely (was already marked negative optimization)
- TwoPunctureABE and ABE both verified to build successfully

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

AMSS_NCKU_source/makefile.inc

@@ -1,33 +1,16 @@
-## GCC version (commented out)
-## filein  = -I/usr/include -I/usr/lib/x86_64-linux-gnu/mpich/include -I/usr/lib/x86_64-linux-gnu/openmpi/lib/ -I/usr/lib/gcc/x86_64-linux-gnu/11/ -I/usr/include/c++/11/
-## filein  = -I/usr/include/ -I/usr/include/openmpi-x86_64/ -I/usr/lib/x86_64-linux-gnu/openmpi/include/ -I/usr/lib/x86_64-linux-gnu/openmpi/lib/ -I/usr/lib/gcc/x86_64-linux-gnu/11/ -I/usr/include/c++/11/
-## LDLIBS  = -L/usr/lib/x86_64-linux-gnu -L/usr/lib64 -L/usr/lib/gcc/x86_64-linux-gnu/11 -lgfortran -lmpi -lgfortran
-
-## Intel oneAPI version with oneMKL (Optimized for performance)
+## GCC version with OpenMPI and oneMKL
 filein  = -I/usr/include/ -I${MKLROOT}/include
 
-## Using sequential MKL (OpenMP disabled for better single-threaded performance)
-## Added -lifcore for Intel Fortran runtime and -limf for Intel math library
-LDLIBS  = -L${MKLROOT}/lib -lmkl_intel_lp64 -lmkl_sequential -lmkl_core -lifcore -limf -lpthread -lm -ldl -liomp5
+## Using MKL with gfortran interface (-lmkl_gf_lp64 instead of -lmkl_intel_lp64)
+LDLIBS  = -L${MKLROOT}/lib -lmkl_gf_lp64 -lmkl_sequential -lmkl_core -lgfortran -lpthread -lm -ldl -lgomp
 
 ## Memory allocator switch
-##   1 (default) : link Intel oneTBB allocator (libtbbmalloc)
-##   0           : use system default allocator (ptmalloc)
-USE_TBBMALLOC ?= 1
-TBBMALLOC_SO ?= /home/intel/oneapi/2025.3/lib/libtbbmalloc.so
-ifneq ($(wildcard $(TBBMALLOC_SO)),)
-TBBMALLOC_LIBS = -Wl,--no-as-needed $(TBBMALLOC_SO) -Wl,--as-needed
-else
-TBBMALLOC_LIBS = -Wl,--no-as-needed -ltbbmalloc -Wl,--as-needed
+##   0 (default) : use system default allocator (ptmalloc)
+##   1           : use jemalloc (install jemalloc-devel first)
+USE_JEMALLOC ?= 0
+ifeq ($(USE_JEMALLOC),1)
+LDLIBS := -ljemalloc $(LDLIBS)
 endif
-ifeq ($(USE_TBBMALLOC),1)
-LDLIBS := $(TBBMALLOC_LIBS) $(LDLIBS)
-endif
-
-## PGO build mode switch (ABE only; TwoPunctureABE always uses opt flags)
-##   opt        : (default) maximum performance with PGO profile-guided optimization
-##   instrument : PGO Phase 1 instrumentation to collect fresh profile data
-PGO_MODE ?= opt
 
 ## Interp_Points load balance profiling mode
 ##   off        : (default) no load balance instrumentation
@@ -70,13 +53,12 @@ USE_TRANSFER_CACHE ?= auto
 ##   0           : use original Fortran rungekutta4_rout.o
 USE_CXX_RK4 ?= 1
 
-f90          = ifx
-f77          = ifx
-CXX          = icpx
-CC           = icx
-CLINKER      = mpiicpx
+f90          = gfortran
+f77          = gfortran
+CXX          = g++
+CC           = gcc
+CLINKER      = mpicxx
 
 Cu = nvcc
 CUDA_LIB_PATH = -L/usr/lib/cuda/lib64 -I/usr/include -I/usr/lib/cuda/include
-#CUDA_APP_FLAGS = -c -g -O3 --ptxas-options=-v -arch compute_13 -code compute_13,sm_13 -Dfortran3 -Dnewc
 CUDA_APP_FLAGS = -c -g -O3 --ptxas-options=-v -Dfortran3 -Dnewc