CPFIRST environment variable
Use the CPFIRST environment variable to specify the default compilation order for all Informix® ESQL/C source files in your programming environment.
When you compile Informix ESQL/C programs with
CPFIRST not set, the Informix ESQL/C preprocessor runs first, by default, on the
program source file and then passes the resulting file to the C language preprocessor and compiler.
You can, however, compile the Informix ESQL/C
program source file in the following order:
- Run the C preprocessor
- Run the Informix ESQL/C preprocessor
- Run the C compiler and linker
To use a nondefault compilation order for a specific program, you can either give the program source file a .ecp extension, run the -cp option with the esql command on a program source file with a .ec extension, or set CPFIRST.
Set CPFIRST to TRUE (uppercase
only) to run the C preprocessor before the Informix ESQL/C preprocessor
on all Informix ESQL/C source
files in your environment, irrespective of whether the -cp option
is passed to the esql command or the source files have the .ec or
the .ecp extension.
To restore the default order on a system where the CPFIRST environment
variable has been set to
TRUE, you can set CPFIRST to FALSE.
On UNIX™ systems that support
the C shell, the following command has the same effect:unsetenv CPFIRST