The CPFIRST environment variable (UNIX)

The CPFIRST environment variable specifies whether the C preprocessor is to run before the IBM® Informix® ESQL/C preprocessor on all Informix ESQL/C source files.

Set the environment variable to TRUE (uppercase only) to run the C preprocessor on all Informix ESQL/C source files, irrespective of whether the -cp option is passed to the esql command, and irrespective of whether the source file has the .ec or the .ecp extension.