fix[sda]: build breaks on gcc@11, maybe related to change of default C++ standard

packages/sda/package.py

@@ -39,6 +39,7 @@ class Sda(MakefilePackage):
         makefile = FileFilter('src/Makefile')
         makefile.filter(r'gfortran', spack_fc)
         makefile.filter(r'^\s*FC\s*=.*',  'FC = '  + spack_fc)
+        makefile.filter(r'^CFLAG += -O3', 'CFLAG += -std=gnu++14 -O3')
         makefile.filter(r'^\s*CC_plus\s*=.*', 'CXX = ' + spack_cxx)
         makefile.filter(r'\${CC_plus}', '${CXX}')
         makefile.filter(r'^\s*CC_moins\s*=.*', 'CC = ' + spack_cc)