Use C++ in SPM preset (#832)

backend/coreapp/compilers.py

@@ -1186,7 +1186,7 @@ def preset_from_name(name: str) -> Optional[Preset]:
 MKW_SHARED = "-nodefaults -align powerpc -enc SJIS -proc gekko -enum int -O4,p -inline auto -W all -fp hardware -W noimplicitconv -w notinlined -w nounwanted -DREVOKART -Cpp_exceptions off -RTTI off -nostdinc -msgstyle gcc -func_align 4 -sym dwarf-2"
 
 # SPM Common flags
-SPM_SHARED = "-enc SJIS -lang c99 -W all -fp fmadd -Cpp_exceptions off -O4 -use_lmw_stmw on -str pool -rostr -sym on -ipa file"
+SPM_SHARED = "-enc SJIS -lang c++ -W all -fp fmadd -Cpp_exceptions off -O4 -use_lmw_stmw on -str pool -rostr -sym on -ipa file"
 
 # Rat Proto Common flags
 RAT_SHARED = '-fp_contract on -pool off -RTTI off -nodefaults -Cpp_exceptions off -schedule on -lang=c++ -char signed -str reuse,pool,readonly -fp fmadd -use_lmw_stmw on -pragma "cpp_extensions on" -sym on -enum int -inline off'