The SBCS version of the C compiler, ICC.EXE, can be used on the DBCS OS/2.
In a C program source code, DBCS characters are allowed in the comments and literals only. Both the SBCS version and the DBCS version of the ICC compiler provide a command line option /Sn+ to compile source files which contain DBCS literals or comments. If your source file contains wchar_t literals known as L-literal such as L'a' and L"abcd", the /Sn+ option is mandatory to generate the correct object files.