#include <stdio.h>
main()
{
    printf (“hello, world\n”);
}

This source can be compiled at the prompt as follows.

Shell> cc –o a a.c

It can be compiled with make using the simple Makefile script as follows.

shell> vi Makefile
a:a.c # User-created protocols and dependencies
	cc -o a a.c # Describes the actual command line to be executed

1. A Makefile can be described as a script that navigates through the source and describes the listed commands to create a target as described above.a:a.c finds a.c to make a (check for changes)
2. cc -o a.c executes this command when a.c exists
3. shell> make -f Makefile If the file name is Makefile, -f Makefile can be omitted

A Makefile can be described as a script that navigates through the source and describes the listed commands to create a target as described above.

If there is no change to the same source, the error "make: is up to date" will be output because compilation does not need to be performed.

Example Sources

The example source to proceed uses $ALTIBASE_HOME/sample?APRE?connect1.sc included in the same sources in the directory where Altibase is installed. (Based on Altibase 5.3 or later)

This example was written based on the environment compiling based on the GCC compiler in Linux. Therefore, when using other Unix environments and compilers, a part of Makefile must be written differently for the environment.

Some of the sources are as follows.

Shell> vi connect1.sc
int main()
{
    char usr[20];
    char pwd[20];
    char opt [200];


    sprintf (usr, “sys”);
    sprintf (pwd, “manager”);
    sprintf (opt, “DSN=127.0.0.1;CONNTYPE=1;PORT_NO=27584”);

    EXEC SQL CONNECT :usr IDENTIFIED BY :pwd USING :opt ;
    if (sqlca.sqlcode != 0)
       printf (“ConnectErr: %d-%s\n”, SQLCODE,sqlca.sqlerrm.sqlerrmc);

Running the Precompile

The APRE extension of Altibase uses "*.sc". Since this file is not in a format that can be directly interpreted by the C/C++ compiler, it must be converted into C/C++ source with the precompiler provided by Altibase.

1. Makefile contents

    

   Code Block
   connect1.sc:connect1.sc apre -t c connect1.sc

2. Execution

    

   Code Block
   Shell> make -f Makefile connect1.sc

   When running after creating the Makefile like this, connect1.c is newly created. (Depending on the extension option, change it to C/C++ according to the user environment.)

Compling

Now add a convention to the Makefile to make it the executable connect1.

Of course, it is okay to use pre-compilation protocols and compile conventions in the connect1 protocol. Here, it will be explained separately. In the above, because the connect1 protocol requires connect1.c in the make step, the protocol for connect1.c is found in the Makefile.

Since there is a corresponding protocol in the Makefile, it operates in the order of precompiling first and then cc compiling. However, when actually compiling, it will get the following error:

Refer to the line in bold, there was an error that the header file could not be found. In the Makefile, the path to the header and library that the user used on the source to compile should be specified as described in the next step.

Specifying the header file and library path

Modify Makefile as follows to refer to Header file and Library.

The above error occurs when trying to refer to the library in which the functions used in the source are defined, but cannot be found at the compile stage. In the case of headers, it is no necessary to specify all individual head files, but in the case of a library, it must be specified.

Specifying the basic library for APRE compilation

Modify the Makefile as follows.

Add basic library fo APRE