Merge pull request #401 from GEOS-ESM/feature/mathomp4/add-flang-v3

v3: Add preliminary Flang support

CHANGELOG.md

@@ -17,11 +17,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Deprecated
 
-## [3.51.0] - 2024-08-13
+## [3.51.0] - 2024-09-05
 
 ### Added
 
 - Add `FindJeMalloc.cmake` for use with builds of GEOSgcm
+- Add preliminary LLVMFlang support
 
 ## [3.50.0] - 2024-08-12
 

compiler/flags/LLVMFlang_Fortran.cmake

@@ -0,0 +1,97 @@
+if (CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 20)
+  message(FATAL_ERROR "${CMAKE_Fortran_COMPILER_ID} version must be at least 20!")
+endif()
+
+set (FOPT0 "-O0")
+set (FOPT1 "-O1")
+set (FOPT2 "-O2")
+set (FOPT3 "-O3")
+set (FOPT4 "-O4")
+set (DEBINFO "-g")
+
+set (FPE0 "")
+set (FPE3 "")
+set (FP_MODEL_SOURCE "")
+set (FP_MODEL_STRICT "")
+set (FP_MODEL_CONSISTENT "")
+
+set (OPTREPORT0 "")
+set (OPTREPORT5 "")
+
+set (FREAL8 "-fdefault-real-8 -fdefault-double-8")
+set (FINT8 "-fdefault-integer-8")
+set (UNUSED_DUMMY "")
+set (PP    "-cpp")
+
+#set (BIG_ENDIAN "-fconvert=swap") # This doesn't seem to work at the moment
+#set (LITTLE_ENDIAN "") # Not sure
+set (EXTENDED_SOURCE "-ffixed-line-length-132")
+set (FIXED_SOURCE "-ffixed-form")
+set (MCMODEL "")
+set (TRACEBACK "")
+set (NOOLD_MAXMINLOC "")
+set (REALLOC_LHS "")
+set (ARCH_CONSISTENCY "")
+set (FTZ "")
+set (ALIGN_ALL "")
+set (NO_ALIAS "")
+
+set (NO_RANGE_CHECK "")
+
+cmake_host_system_information(RESULT proc_description QUERY PROCESSOR_DESCRIPTION)
+
+# NOT SURE ABOUT ANY OF THIS...
+if ( ${CMAKE_HOST_SYSTEM_PROCESSOR} STREQUAL aarch64 )
+  set (FLANG_TARGET_ARCH "-mcpu=armv8.2-a+crypto+crc+fp16+rcpc+dotprod")
+elseif (${proc_description} MATCHES "Apple M")
+  set (FLANG_TARGET_ARCH "-mcpu=apple-m1")
+elseif (${proc_description} MATCHES "EPYC")
+  set (FLANG_TARGET_ARCH "-mcpu=znver2")
+elseif (${proc_description} MATCHES "Intel")
+  set (FLANG_TARGET_ARCH "-mcpu=haswell")
+elseif ( ${CMAKE_HOST_SYSTEM_PROCESSOR} STREQUAL "x86_64" )
+  message(WARNING "Unknown processor type. Defaulting to a generic x86_64 processor. Performance may be suboptimal.")
+  set (FLANG_TARGET_ARCH "x86-64")
+else ()
+  message(FATAL_ERROR "Unknown processor. Please file an issue at https://github.com/GEOS-ESM/ESMA_cmake")
+endif ()
+
+# ...SO WE JUST TURN OFF FLANG_TARGET_ARCH FOR NOW
+set (FLANG_TARGET_ARCH "")
+
+####################################################
+
+# Common Fortran Flags
+# --------------------
+set (common_Fortran_flags "${NO_RANGE_CHECK} ${TRACEBACK} ${UNUSED_DUMMY}" )
+set (common_Fortran_fpe_flags "${TRACEBACK}")
+
+# GEOS Debug
+# ----------
+set (GEOS_Fortran_Debug_Flags "${FOPT0} ${DEBINFO}")
+set (GEOS_Fortran_Debug_FPE_Flags "${common_Fortran_fpe_flags}")
+
+# GEOS Release
+# ------------
+set (GEOS_Fortran_Release_Flags "${FOPT3} ${FLANG_TARGET_ARCH} ${DEBINFO}")
+set (GEOS_Fortran_Release_FPE_Flags "${common_Fortran_fpe_flags}")
+
+# Create a NoVectorize version for consistency. No difference from Release for GNU
+
+# GEOS NoVectorize
+# ----------------
+set (GEOS_Fortran_NoVect_Flags  "${GEOS_Fortran_Release_Flags}")
+set (GEOS_Fortran_NoVect_FPE_Flags "${GEOS_Fortran_Release_FPE_Flags}")
+
+# GEOS Vectorize
+# --------------
+
+# Until good options can be found, make vectorize equal common flags
+set (GEOS_Fortran_Vect_Flags ${GEOS_Fortran_Release_Flags})
+set (GEOS_Fortran_Vect_FPE_Flags ${GEOS_Fortran_Release_FPE_Flags})
+
+set (GEOS_Fortran_Aggressive_Flags "${GEOS_Fortran_Release_Flags}")
+set (GEOS_Fortran_Aggressive_FPE_Flags "${GEOS_Fortran_Release_FPE_Flags}")
+
+# Common variables for every compiler
+include(Generic_Fortran)