build(fortran): added check for fortran

fortran tests only build when fortran build option is enabled

meson.build

@@ -31,20 +31,20 @@ message('Found FORTRAN compiler: ' + meson.get_compiler('fortran').get_id())
 message('C++ standard set to: ' + get_option('cpp_std'))
 message('Fortran standard set to: ' + get_option('fortran_std'))
 
+cppc = meson.get_compiler('cpp')
 
-if meson.get_compiler('cpp').get_id() == 'clang'
-    # We disable these because of CppAD
+
+if cppc.get_id() == 'clang'
     message('disabling bitwise-instead-of-logical warnings for clang')
     add_project_arguments('-Wno-bitwise-instead-of-logical', language: 'cpp')
 endif
 
-if meson.get_compiler('cpp').get_id() == 'gcc'
-    # We disable these because of boost notes about abi changes from C++10 -> C++17 make the build too noisey
+if cppc.get_id() == 'gcc'
     message('disabling psabi warnings for gcc')
     add_project_arguments('-Wno-psabi', language: 'cpp')
     
-    if (meson.get_compiler('cpp').version().version_compare('<14.0'))
-      error('g++ version must be at least 14.0, found ' + meson.get_compiler('cpp').version())
+    if (cppc.version().version_compare('<14.0'))
+      error('g++ version must be at least 14.0, found ' + cppc.version())
     endif
 endif
 
@@ -58,12 +58,20 @@ if (build_fortran)
       error('The only supported fortran compiler for GridFire is gfortran (version >= 14.0), found ' + fc  + '. GridFire has not been tested with any other compilers. You can disable this check with the -Dunsafe-fortran=true flag to try other compilers')
     endif
   endif
-  if (meson.get_compiler('fortran').version().version_compare('<14.0'))
-      error('gfortran version must be at least 14.0, found ' + meson.get_compiler('fortran').version())
+  if (fc.version().version_compare('<14.0'))
+      error('gfortran version must be at least 14.0, found ' + fc.version())
   endif
 endif
 
 
+if not cppc.has_header('print')
+    error('C++ standard library header <print> not found. Please ensure your compiler and standard library supports C++23. We have already validated your compiler version so this is likely an issue with your standard library installation.')
+endif
+if not cppc.has_header('format')
+    error('C++ standard library header <format> not found. Please ensure your compiler and standard library supports C++23. We have already validated your compiler version so this is likely an issue with your standard library installation.')
+endif
+
+
 
 
 # For Eigen

tests/extern/meson.build

@@ -1,2 +1,5 @@
 subdir('C')
-subdir('fortran')
+
+if get_option('build-fortran')
+  subdir('fortran')
+endif