UNIX for Dummies Questions & Answers

Hi,

This stems from the following thread https://www.unix.com/shell-programming-and-scripting/18299-makefile-not-taking-d-flags.html

I have a makefile which makes either executables or a shared library.
i.e. make -f unix.mak will create the executables and
make -f unix.mak libolsv will create the shared library.

Since these have to be made i.e both executable and the shared library, I need to make the executables and then a clean ( make -f unix.mak cleanobj) and then make the shared library.

But I want to avoid the intermediate step of make -f unix.mak clean; i.e. the user should not do it explicitly. Is there any way I can include it in the rule for the shared library.

This is what I have.

Code:

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

$(EXE1): $(EXE) $(O1)
        g++ $(CFLAGS) -o $(EXE1) $(O1)

$(EXE): $(O) *.h
        $(CC) -o $(EXE) $(O)

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

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

cleanobj::
        -$(RM) *.o

This is what I have tried:

Code:

$(DAEMON_SO): OdbcSvApp.o $(SO) *.h
        -make -f unix.mak cleanobj
        $(CC) -shared -export-dynamic -DODBCSV_SO -o $(DAEMON_SO) OdbcSvApp.o $(SO)

and also this

Code:

$(DAEMON_SO): OdbcSvApp.o $(SO) *.h
        -$(RM) *.o
        $(CC) -shared -export-dynamic -DODBCSV_SO -o $(DAEMON_SO) OdbcSvApp.o $(SO)

and I get the following error in both the cases:

gcc: OdbcSvApp.o: No such file or directory
gcc: SvSocket.o: No such file or directory
gcc: SvStmt.o: No such file or directory
gcc: SvOdbcWrapper.o: No such file or directory
gcc: OdbcCallReader.o: No such file or directory
gcc: MgrCalls.o: No such file or directory
gcc: OdbcSvProxy.o: No such file or directory
make: *** [libolsv20.so] Error 1

So how do I get around this. I want to include the clean rule in $(DAEMON_SO)

Vino

Are .o files existing in the current dir ???

try -f option for rm to avoid errors.

Yes they are in the same directory.



$(RM) *.o expands to /bin/rm -f *.o

Your "$(DAEMON_SO): OdbcSvApp.o $(SO) *.h" demands the presense of some .o file as a prerequisite. So "make" goes off and figures out how to make them. Once they exist, "make" runs the steps in this rule. Your first step is "-$(RM) *.o" (or equivalent). Then your second step barfs because there are no .o files.

create a new first rule something like:

default: cleanobj $(DAEMON_SO)

Perderabo. Thanks again ! That worked nice.
Vino