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conditional output in makefile

Posted on 2008-10-20
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Last Modified: 2013-12-16
Hi All,

I have the following code in my config.h

#define SERVER_MODE 1


Then I want the make file to test for this value in order to generate the output


Sthg like that :

Ifeq (SERVER_MODE,1)
à my outout is server
Else
My output is client

Endif


Can you help to get the right syntax

Im running my code on Sun 5.10
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Question by:bachra04
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23 Comments
 
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Author Comment

by:bachra04
ID: 22760109
This is an urgent question
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Expert Comment

by:Infinity08
ID: 22760199
Usually, you'd define the SERVER_MODE in the makefile, and pass it to the compiler using -DSERVER_MODE=1
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Author Comment

by:bachra04
ID: 22760260
The problem is that I use SERVER_MODE inside my main.cpp class
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Expert Comment

by:itsmeandnobodyelse
ID: 22760278
You could do something like:

!if "$(CFG)" == "SERVER"
#statements for server build

!endif

!if "$(CFG)" == "CLIENT"
#statements for client build

!endif

Then pass the configuration when calling make (nmake at windows) by adding  CFG=SERVER to the call.


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Expert Comment

by:Infinity08
ID: 22760297
>> The problem is that I use SERVER_MODE inside my main.cpp class

That's ok. By passing the define using -DSERVER_MODE=1, it will be available in the main.cpp file. It would be as if you defined it in the file itself.
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Expert Comment

by:itsmeandnobodyelse
ID: 22760334
To read the SERVER_MODE from header file you could use a grep (or find at Windows) and depending on the result call make with client or server option.
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Author Comment

by:bachra04
ID: 22760420
>>That's ok. By passing the define using -DSERVER_MODE=1, it will be available in the main.cpp file. It would be as if you defined it in the file itself.

Is it possible to write code inside the Make file so I extract the value of SERVER_MODE by simply including config.h inside my makefile ?

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Expert Comment

by:Infinity08
ID: 22760462
>> Is it possible to write code inside the Make file so I extract the value of SERVER_MODE by simply including config.h inside my makefile ?

That's the reverse world. The makefile defines what kind of application you build. The config.h file should be used for more general configuration settings (general to both client and server).

A simple example makefile (just to illustrate what I mean) is below. It is either called like :

        make server

or :

        make client

depending on which you want to build.
## makefile ##
 
server : main.cpp
	CC -DSERVER_MODE=1 main.cpp -o server
 
client : main.cpp
	CC -DSERVER_MODE=0 main.cpp -o client

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by:bachra04
ID: 22760544
I agree with you but we have a building framework and I only have the right to change the makefile inside my directory (I don't have direct access to gcc options)



#OBJ_DIR = ./$(SRV_BUILD)/$(COMPILER)

#ADD_FLAGS = -I. -I..

#include ../common.mk

#include ./files.mk

#include ./CProtocolConfig.h


#SHARED_LIB = $(LIB_DIR)/libProtocols-$(LIBSSUFF)

#all:  $(SHARED_LIB)

#clean: clean_sharedls

#clobber: clobber_shared
      
#include ../common_targets.mk

#-include $(DEP_FILES)


OBJ_DIR = ./$(SRV_BUILD)/$(COMPILER)

BIN_DIR = ./bin/$(SRV_BUILD)/$(COMPILER)

ADD_FLAGS = -I. -I..
include ../common.mk

include ./files.mk

#ifeq(SERVER_MODE, 1)
#GWSRV = $(BIN_DIR)/QmtfServer
#else
GWSRV = $(BIN_DIR)/QmtfClient
#endif

SOL_COMMON = -lCommon-$(LIBSUFF)
#SOL_DBACC =  -lDBAccess-$(LIBSUFF)
#SOL_PROTO =  -lProtocols-$(LIBSUFF)
#SOL_FIX = -lFix-$(LIBSUFF)
SOLIBS = -L$(LIB_DIR) $(SOL_COMMON)

all:  $(GWSRV)

$(GWSRV) : $(BIN_DIR) $(OBJ_DIR) $(ARLIBS) $(OBJ_FILES)
      $(CCC) $(COMMON_EXEC) $(OBJ_FILES) $(ARLIBS) $(EXEC_FLAGS) $(BOOST_LINK) $(SOLIBS) -o $(GWSRV)
      
clean:
      rm -f $(GWSRV) $(OBJ_FILES) $(DEP_FILES)
      
clobber:
      rm -rf $(OBJ_DIR) $(BIN_DIR)
      
include ../common_targets.mk

-include $(DEP_FILES)

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Expert Comment

by:itsmeandnobodyelse
ID: 22760580
>>>> That's the reverse world.
Infinity is right. A header is a bad place to store build options. You would need to change the header when building both client and server at one system. Or, if using a version and configuration system to manage sources between systems, you would need to have different active versions of the same header.

Better pass the SERVER_MODE as compiler option as Infinity explained in his first comment.
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Expert Comment

by:Infinity08
ID: 22760620
>> I don't have direct access to gcc options)

The gcc options are passed in the makefile. So, you just have to modify the makefile. See my example.
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Expert Comment

by:itsmeandnobodyelse
ID: 22760653
>>>> I only have the right to change the makefile inside my directory

Then, you either should provide 2 makefiles where one was building the client and another builds the server or you build both the client and the server in the makefile.  


>>> (I don't have direct access to gcc options)
You have. Add the -DSERVER_MODE=1 to the statement beginning with $(CCC)
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Author Comment

by:bachra04
ID: 22760724
You're right

I can do that but if you see I want my output name once called qmtfServer and another time called QmtfClient based on the value of only one variable

#GWSRV = $(BIN_DIR)/QmtfServer
#else
GWSRV = $(BIN_DIR)/QmtfClient
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Expert Comment

by:Infinity08
ID: 22760729
How about :
OBJ_DIR = ./$(SRV_BUILD)/$(COMPILER)
 
BIN_DIR = ./bin/$(SRV_BUILD)/$(COMPILER)
 
ADD_FLAGS = -I. -I..
include ../common.mk
 
include ./files.mk
 
SERVER_BIN = $(BIN_DIR)/QmtfServer
CLIENT_BIN = $(BIN_DIR)/QmtfClient
 
SOL_COMMON = -lCommon-$(LIBSUFF)
#SOL_DBACC =  -lDBAccess-$(LIBSUFF)
#SOL_PROTO =  -lProtocols-$(LIBSUFF)
#SOL_FIX = -lFix-$(LIBSUFF)
SOLIBS = -L$(LIB_DIR) $(SOL_COMMON)
 
all : server client
 
server : $(SERVER_BIN)
 
client : $(CLIENT_BIN)
 
$(SERVER_BIN) : $(BIN_DIR) $(OBJ_DIR) $(ARLIBS) $(OBJ_FILES)
	$(CCC) -DSERVER_MODE=1 $(COMMON_EXEC) $(OBJ_FILES) $(ARLIBS) $(EXEC_FLAGS) $(BOOST_LINK) $(SOLIBS) -o $(SERVER_BIN)
 
$(CLIENT_BIN) : $(BIN_DIR) $(OBJ_DIR) $(ARLIBS) $(OBJ_FILES)
	$(CCC) -DSERVER_MODE=0 $(COMMON_EXEC) $(OBJ_FILES) $(ARLIBS) $(EXEC_FLAGS) $(BOOST_LINK) $(SOLIBS) -o $(CLIENT_BIN)
      
clean:
	rm -f $(SERVER_BIN) $(CLIENT_BIN) $(OBJ_FILES) $(DEP_FILES)
      
clobber:
	rm -rf $(OBJ_DIR) $(BIN_DIR)
      
include ../common_targets.mk
 
-include $(DEP_FILES)

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Expert Comment

by:Infinity08
ID: 22760736
If you want to build the server, you call :

        make server

If you want to build the client :

        make client


Couldn't be simpler ;)
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Author Comment

by:bachra04
ID: 22760940
No couldn't be simpler
but inside my main class how to test the SERVER_MODE value ?
using #if ?
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Expert Comment

by:Infinity08
ID: 22760946
>> but inside my main class how to test the SERVER_MODE value ?

The same way you are doing now :) Just treat it as if it was #define'd.


>> using #if ?

For example, yes.
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Author Comment

by:bachra04
ID: 22761103
I got the client and server output. but only the name is changing. looks like it does not take the SERVER_MODE value
#if SERVER_MODE returns usually false
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Expert Comment

by:Infinity08
ID: 22761327
>> returns usually false

What do you mean by "usually" ?


>> looks like it does not take the SERVER_MODE value

Can you show your source code ? Did you use the makefile I posted ? Did you remove the #define from config.h ?
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Author Comment

by:bachra04
ID: 22761350
yes I have remove the
#define from config.h ?

#if SERVER_MODE

    if (argc < 3)
    {
      std::cerr << "Usage: QmtfServer <host> <port> \n";
      return 1;
            }

            ORBIXA_PREPARE_COMM_SESSION      
            CProtocolInfo cInfo(ORBIXA_IO_COMM);
            
            cInfo.setHostAddress(argv[1]);
            cInfo.setHostPort(boost::lexical_cast<unsigned int>(argv[2]));
            cInfo.setProtocol(IProtocolInfo::eTCP_IP);
            cInfo.setMode(IProtocolInfo::eServer);
            cInfo.setChannelNumber(1);

            IInternalProtocol* pInternalProtocol =
                  CInternalProtocolFactory::getInstance()->getInternalProtocol(&cInfo);

            IInternalProtocol::protocols pvecMeProtocol;
            pInternalProtocol->getProcessProtocol(IInternalProtocol::PROC_ME, pvecMeProtocol);

            // Set and hook the handler      
            pvecMeProtocol[0]->setProtocolHandler<CMyProtocolHandler>();
            pvecMeProtocol[0]->hookHandlers();

            ORBIXA_START_COMM_SESSION            

            char line[qmtf_message::max_body_length + 1];            
            while (std::cin.getline(line, qmtf_message::max_body_length + 1))
            {
                   using namespace std; // For strlen and memcpy.
                   qmtf_message msg;
                   msg.setType(7);
                   msg.body_length(strlen(line));
                   memcpy(msg.body(), line, msg.body_length());
                   msg.encode_header();                   
                   pvecMeProtocol[0]->writeQueue( 0, 7, msg.body_./length(), (const void*) msg.body());
            }

            ORBIXA_END_COMM_SESSION
                  
  }
  catch (std::exception& e)
  {
    std::cerr << "Exception: " << e.what() << "\n";
  }
      
#else

            //==============================
            //
            //      Create a      TCP client
            //
            //==============================


            if (argc != 3)
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Accepted Solution

by:
Infinity08 earned 500 total points
ID: 22761378
That's a big #if. Are you sure you don't just want to place the server and client code in separate source files ? That would make things a bit nicer/cleaner.

How did you verify that the define is not recognized ? What did "usually" mean in your previous post ?
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Author Closing Comment

by:bachra04
ID: 31507916
yes I'm thinking about putting both client and server in different files
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Expert Comment

by:itsmeandnobodyelse
ID: 22762326
You easily can check wether an #if applies by adding a

#error "any text"

after the #if statement

The precompiler would stop at that statement and printout the message.
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