added comments about summit build steps

Signed-off-by: Thien Nguyen <nguyentm@ornl.gov>

mlir/parsers/qasm3/examples/adder.qasm

@@ -3,8 +3,27 @@
  * Cuccaro et al, quant-ph/0410184
  */
 // Summit compile:
+// Summit set-up:
+// module load cmake/3.20.2 python/3.8.10 gcc/9.3.0 cuda/11.4.0
+// Interactive node request:
+// bsub -Is -W 1:00 -nnodes 1 -P PHYXXX $SHELL
+// Note: Summit can be **fully-booked** (running leadership-type jobs) hence the above
+// request can be pending in a long time. 
 // Using DM-Sim:
 // qcor -linker g++ -qrt nisq adder.qasm -shots 1024 -qpu dm-sim[gpus:4]
+// Note: on a login node,GPU-GPU comm is disabled, hence can only run with 1 GPU.
+
+
+// Utils:
+// See number of GPU's: nvidia-smi --query-gpu=name --format=csv,noheader | wc -l
+// XACC/LLVM-CSP/QCOR compile:
+// LLVM-CSP
+// cmake ../llvm -DCMAKE_INSTALL_PREFIX=~/.llvm -DCMAKE_C_COMPILER=/sw/summit/gcc/9.3.0-2/bin/gcc -DCMAKE_CXX_COMPILER=/sw/summit/gcc/9.3.0-2/bin/g++ -DLLVM_ENABLE_PROJECTS="clang;mlir" -DBUILD_SHARED_LIBS=TRUE
+
+// QCOR: (must add paths to the specific gcc module paths)
+// cmake .. -DXACC_DIR=~/.xacc -DLLVM_ROOT=~/.llvm -DMLIR_DIR=~/.llvm/lib/cmake/mlir -DQCOR_BUILD_TESTS=TRUE -DCMAKE_BUILD_TYPE=Debug -DQCOR_EXTRA_HEADERS="/sw/summit/gcc/9.3.0-2/include/c++/9.3.0/powerpc64le-unknown-linux-gnu/;/sw/summit/gcc/9.3.0-2/include/c++/9.3.0/"
+
+// export PATH=~/.xacc/bin:$PATH
 
 OPENQASM 3;