Perderabo, you are right. I did find that out on further analysis.

A question. Is there any way I can over-ride the builtin rule for .cpp.o ?

The structure of the makefiles is as follows:

There is a universal makefile for the whole component. That in turn traverses to each of the directory inside and then calls the makefile of the respective sub-component.

Now in the universal makefile, the rules are defined for .cpp.o and other targets too.

In this particular sub-comp of DAEMON_SO, the make file is such that you do a make once to create the executables, followed by a clean and then a make for the creation of .so. So for the case of .so an extra flag -DODBCSV_SO is introduced. I wrote a rule for the OdbcSvApp.o. OdbcSvApp.cpp is responsible for the .so.

Code:

SO              = SvSocket.o SvStmt.o SvOdbcWrapper.o \
                  OdbcCallReader.o MgrCalls.o OdbcSvProxy.o

OSVAPP          = OdbcSvApp.o
OSVAPP : OdbcSvApp.cpp
        $(CC) -c $(CFLAGS) -DODBCSV_SO -o $(OSVAPP) 

$(DAEMON_SO): OdbcSvApp.o $(SO) *.h
        $(CC) -shared -export-dynamic -DODBCSV_SO -o $(DAEMON_SO) $(OSVAPP) $(SO)
        @echo $(DAEMON_SO) has been built.

Now after issuing make -f unix.mak libolsv, it all goes through peacefully. But, still -DODBCSV_OS does not get included in the rule for OdbcSvApp.cpp. Which shows, my rule is not picked up. So, how can I over-ride the builtin rule for just one cpp file.

Another way out is surely introduce another make file for the .so. But since it is a workaround I dont intend to unless it is the ONLY way out.

The following is the result output( for clarity sakes) showing the compilation statement with flags and options.

Code:

g++ -DRS_V8 -DMD5Init=OLiteMD5Init -DMD5Update=OLiteMD5Update
-DMD5Final=OLiteMD5Final -Wall -Wunused -Wno-parentheses
-Wno-sign-compare -Wno-non-virtual-dtor -Wno-reorder -DNDEBUG -O3
-fomit-frame-pointer -mcpu=pentium3 -fPIC -DOOT_SHARED_MEM  
-I/usr/java/j2sdk1.4.1_07/include -I/usr/java/j2sdk1.4.1_07/include/linux -I. 
-D_REENTRANT -DOOT_SHARED_MEM -Dboolean=char -c -o OdbcSvProxy.o 
OdbcSvProxy.cpp

gcc -shared -export-dynamic -DODBCSV_SO -o libolsv2040.so OdbcSvApp.o  
SvSocket.o SvStmt.o SvOdbcWrapper.o OdbcCallReader.o MgrCalls.o 
OdbcSvProxy.o -lpthread -lrt -lm -ldl 
-L/usr/java/j2sdk1.4.1_07/jre/lib/i386/server -ljvm 
libolsv2040.so has been built.

-v