allow building library alone with older compiler (test requires more f2008 support)

Author: scivision

meson.build

@@ -1,20 +1,18 @@
 project('MapTran', 'fortran',
   meson_version : '>=0.51.2',
-  default_options : ['default_library=static', 'buildtype=release'])
+  default_options : ['default_library=static', 'buildtype=release', 'warning_level=3'])
 
 realbits = '-DREALBITS='+get_option('realbits')
 
 fc = meson.get_compiler('fortran')
+f18flag = fc.first_supported_argument(['-std=f2018', '-stand f18', '/stand:f18'])
 if fc.get_id() == 'gcc'
-  add_project_arguments('-fimplicit-none', '-Wall', '-Wextra', '-Wpedantic', language : 'fortran')
-  if fc.version().version_compare('>=8')
-    add_project_arguments('-std=f2018', language : 'fortran')
-  endif
-elif fcid == 'intel'
-  add_project_arguments('-warn', '-heap-arrays', '-stand f18', language : 'fortran')
-elif fcid == 'intel-cl'
-  add_project_arguments('/warn', '/heap-arrays', '/stand:f18', language : 'fortran')
-elif fcid == 'pgi'
+  add_project_arguments('-fimplicit-none', f18flag, language : 'fortran')
+elif fc.get_id() == 'intel'
+  add_project_arguments('-warn', '-heap-arrays', language : 'fortran')
+elif fc.get_id() == 'intel-cl'
+  add_project_arguments('/fpp', '/warn', '/heap-arrays', language : 'fortran')
+elif fc.get_id() == 'pgi'
   add_project_arguments('-C', '-Mdclchk', language : 'fortran')
 endif
 
@@ -23,9 +21,11 @@ maptran = library('maptran', 'src/maptran.F90', 'src/vallado.F90', 'src/aer.f90'
   fortran_args : realbits)
 
 # --- testing
-mtexe = executable('testmaptran', 'tests/test_mod.f90', 'src/assert.F90',
-  link_with : maptran,
-  fortran_args : realbits)
+if fc.links('block; end block; end', name: 'F2008 Block syntax')
+  mtexe = executable('testmaptran', 'tests/test_mod.f90', 'src/assert.F90',
+    link_with : maptran,
+    fortran_args : realbits)
 
-test('Maptran'+realbits, mtexe,
-  timeout: 30)
+  test('Maptran'+realbits, mtexe,
+    timeout: 30)
+endif