arm64 compiler fixes

Author: perazz

.github/workflows/CI.yml

@@ -33,6 +33,8 @@ jobs:
         exclude:
           - os: macos-14  # No Intel on MacOS anymore since 2024
             toolchain: {compiler: intel, version: '2025.1'}
+          - os: macos-14  # Intel compiler does not support ARM (macos-14)
+            toolchain: {compiler: intel, version: '2025.2'}
           - os: macos-14  # gcc@10 not available on macos-14 (ARM64)
             toolchain: {compiler: gcc, version: 10}
           - os: windows-latest  # Doesn't pass build and tests yet

ci/test_features.sh

@@ -207,11 +207,8 @@ grep -q "✓ FAST: fast optimization flags found" output.txt || { echo "ERROR: F
 grep -q "✓ All compiler flag checks PASSED" output.txt || { echo "ERROR: Expected all checks to pass"; exit 1; }
 # Check compiler-specific flags (will depend on detected compiler)
 if grep -q "Detected compiler: gfortran" output.txt; then
-    # Check for either -march=native or -mcpu (Apple Silicon uses -mcpu)
-    if ! (grep -q "✓ Release: -march=native found" output.txt || grep -q "✓ Release: -mcpu found" output.txt); then
-        echo "ERROR: gfortran release architecture flag (-march=native or -mcpu) not found"
-        exit 1
-    fi
+    # Check for -mtune flag (portable tuning flag)
+    grep -q "✓ Release: -mtune found" output.txt || { echo "ERROR: gfortran release flag -mtune not found"; exit 1; }
     grep -q "✓ Fast: -ffast-math found" output.txt || { echo "ERROR: gfortran fast flag -ffast-math not found"; exit 1; }
 fi
 echo "✓ Production profile works"

test/fpm_test/test_features.f90

@@ -365,7 +365,7 @@ subroutine test_feature_collection_complex(error)
             & 'debug.linux.flags = "-DLINUX"', &
             & 'debug.windows.ifort.flags = "/DEBUG:FULL"', &
             & 'release.flags = "-O3"', &
-            & 'release.gfortran.flags = "-march=native"'
+            & 'release.gfortran.flags = "-mtune=generic -funroll-loops"'
         close(unit)
 
         call get_package_data(package, temp_file, error)
@@ -1501,7 +1501,7 @@ subroutine test_feature_compiler_flags_integration(error)
         write(unit, '(a)') '[features]'
         write(unit, '(a)') 'debug.gfortran.flags = "-g -Wall -fcheck=bounds"'
         write(unit, '(a)') 'debug.flags = "-g"'
-        write(unit, '(a)') 'release.gfortran.flags = "-O3 -march=native"'
+        write(unit, '(a)') 'release.gfortran.flags = "-O3 -mtune=generic -funroll-loops"'
         write(unit, '(a)') 'release.flags = "-O2"'
         write(unit, '(a)') ''
         write(unit, '(a)') '[profiles]'
@@ -1575,8 +1575,13 @@ subroutine test_feature_compiler_flags_integration(error)
             return
         end if
 
-        if (index(model%fortran_compile_flags, "-march=native") == 0) then
-            call test_failed(error, "Expected release gfortran flags to contain '-march=native'")
+        if (index(model%fortran_compile_flags, "-mtune") == 0) then
+            call test_failed(error, "Expected release gfortran flags to contain '-mtune'")
+            return
+        end if
+
+        if (index(model%fortran_compile_flags, "-funroll-loops") == 0) then
+            call test_failed(error, "Expected release gfortran flags to contain '-funroll-loops'")
             return
         end if
 

test/fpm_test/test_manifest.f90

@@ -1762,7 +1762,7 @@ subroutine test_features_demo_serialization(error)
             & '', &
             & '# Compiler-specific features', &
             & 'debug.gfortran.flags = "-Wall -fcheck=bounds"', &
-            & 'release.gfortran.flags = "-march=native"', &
+            & 'release.gfortran.flags = "-mtune=generic -funroll-loops"', &
             & '', &
             & '# Platform-specific features', &
             & 'linux.preprocess.cpp.macros = "LINUX_BUILD"', &