Filter out FFLAGS that flang-new from LLVM18 no longer supports (#4569)

* Filter out FFLAGS that flang-new from LLVM18 no longer supports

Author: martin-frbg

Makefile.system

@@ -1670,6 +1670,10 @@ ifeq ($(F_COMPILER),CRAY)
 LAPACK_FFLAGS := $(filter-out -msse3 -mssse3 -msse4.1 -mavx -mavx2 -mskylake-avx512 ,$(FFLAGS))
 override FFLAGS := $(filter-out -msse3 -mssse3 -msse4.1 -mavx -mavx2 -mskylake-avx512 ,$(FFLAGS))
 endif
+ifeq ($(F_COMPILER),FLANGNEW)
+LAPACK_FFLAGS := $(filter-out -m32 -m64 -msse3 -mssse3 -msse4.1 -mavx -mavx2 -mskylake-avx512 ,$(FFLAGS))
+override FFLAGS := $(filter-out -m32 -m64 -msse3 -mssse3 -msse4.1 -mavx -mavx2 -mskylake-avx512 ,$(FFLAGS))
+endif
 
 LAPACK_CFLAGS = $(CFLAGS)
 LAPACK_CFLAGS += -DHAVE_LAPACK_CONFIG_H

cmake/fc.cmake

@@ -88,7 +88,9 @@ if (${F_COMPILER} STREQUAL "GFORTRAN" OR ${F_COMPILER} STREQUAL "F95" OR CMAKE_F
     endif ()
   else ()
     if (BINARY64)
+      if (NOT CMAKE_Fortran_COMPILER_ID MATCHES "LLVMFlang.*")
       set(FCOMMON_OPT "${FCOMMON_OPT} -m64")
+      endif ()
       if (INTERFACE64)
         if (CMAKE_Fortran_COMPILER_ID STREQUAL "Intel")
           if (WIN32)
@@ -101,7 +103,9 @@ if (${F_COMPILER} STREQUAL "GFORTRAN" OR ${F_COMPILER} STREQUAL "F95" OR CMAKE_F
         endif ()
       endif ()
     else ()
-      set(FCOMMON_OPT "${FCOMMON_OPT} -m32")
+        if (NOT CMAKE_Fortran_COMPILER_ID MATCHES "LLVMFlang.*")
+           set(FCOMMON_OPT "${FCOMMON_OPT} -m32")
+	endif ()
     endif ()
   endif ()
 

cmake/system.cmake

@@ -616,13 +616,19 @@ if (${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
   endforeach ()
 endif ()
 
-if ("${F_COMPILER}" STREQUAL "NAG" OR "${F_COMPILER}" STREQUAL "CRAY")
+if (CMAKE_Fortran_COMPILER)
+if (${F_COMPILER} STREQUAL "NAG" OR ${F_COMPILER} STREQUAL "CRAY" OR CMAKE_Fortran_COMPILER_ID MATCHES "LLVMFlang.*")
   set(FILTER_FLAGS "-msse3;-mssse3;-msse4.1;-mavx;-mavx2,-mskylake-avx512")
+  if (CMAKE_Fortran_COMPILER_ID MATCHES "LLVMFlang.*")
+message(STATUS "removing fortran flags")
+    set(FILTER_FLAGS "${FILTER_FLAGS};-m32;-m64")
+  endif ()
   foreach (FILTER_FLAG ${FILTER_FLAGS})
     string(REPLACE ${FILTER_FLAG} "" LAPACK_FFLAGS ${LAPACK_FFLAGS})
     string(REPLACE ${FILTER_FLAG} "" LAPACK_FPFLAGS ${LAPACK_FPFLAGS})
   endforeach ()
 endif ()
+endif ()
 
 if ("${F_COMPILER}" STREQUAL "GFORTRAN")
   # lapack-netlib is rife with uninitialized warnings -hpa