Using Oracle Database Instant Client

You can build a C/C++ application that uses Oracle Database Instant Client and connect to an Oracle Database server. If you want to build a 64-bit application and use instantclient_19_8/sdk/demo.mk file, then perform the following steps:

Edit the instantclient_19_8/sdk/demo.mk file and set the CC and cc to your gcc location.
Compile the C/C++ application using the flags specified in the demo.mk file, namely, -idirafter . -DMAC_OSX -D_GNU_SOURCE -D_REENTRANT -g -m64 -mmacosx-version-min=10.13 <c_file_name> -I../include.
Start make -f demo.mk buildoci EXE=cdemo81 OBJS=cdemo81.o for a working demonstration of the options.
Add the Java Library Path in the ott script, if you notice the following issue:
Exception in thread "main" java.lang.UnsatisfiedLinkError: no ocijdbc18 in java.library.path
-Djava.library.path=location_of_libocijdbc18

For example, if libocijdbc18.dylib is in the /home/oracle/OTN/instantclient_19_8/ path, then you must add the following line in the ott script:

JAVA_PATH=-Djava.library.path=/home/oracle/OTN/instantclient_19_8/

and run the following command:

exec java $JAVA_PATH $JREOPTIONS oracle.ott.c.CMain nlslang=${NLS_LANG} $args
Modify ICLIBHOME in demo.mk to include the path to the libraries.
For example, if the libraries are located in /home/oracle/OTN/instantclient_19_8/, then place it in the demo.mk file:
ICLIBHOME=/home/oracle/OTN/instantclient_19_8/

The compilation options are as follows:

-idirafter .
                -DMAC_OSX -D_GNU_SOURCE -D_REENTRANT -g -m64 -mmacosx-version-min=10.13
                <c_file_name> -I../include

The link options are as follows:

-g -m64 -mmacosx-version-min=10.13 -rpath
                full_path_to_instantclient_19_8_libs application_name -L../../ -locci -lclntsh
                -lpthread

Parent topic: Oracle Database Instant Client Postinstallation Tasks