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Editorial Team
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Asked: 2026-05-31T09:06:35+00:00

I wrote a small makefile which follows the general structure, creating object files and

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I wrote a small makefile which follows the general structure, creating object files and then linking to create an executable. Here is how it looks.. 

CXX=g++
CXXFLAGS=-Wall -g
INCLUDES= -I ./
LDFLAGS= -L ./
LIBS= -lcryptopp
SRCS= test.cpp
OBJS= $(SRCS:.cpp=.o)
EXEC=test

all: $(EXEC) 

$(EXEC): $(OBJS)
    $(CXX) $(CXXFLAGS) $(INCLUDES) -o $(EXEC) $(OBJS) $(LDFLAGS) $(LIBS)
.cpp.o: 
    $(CXX) $(CXXFLAGS) $(INCLUDES) -c $< -o $@

Cryptopp library(cryptopp) is static. Now when I try to run this makefile, when the first command which tries to create object file runs.. its gives me many errors like this..

test.cpp:289:   instantiated from here
./include/algparam.h:322: warning: unused variable 'p'
./include/algparam.h: In member function 'void CryptoPP::AlgorithmParametersTemplate<T>::MoveInto(void*) const [with T = unsigned char]':

In the end, it links all fine and the executable works but how can I get rid of those warnings without removing -wall? I don’t have much experience with make and makefiles.

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1 Answer

  1. Editorial Team

    That’s not an error, it’s a warning. (Technically, you can consider warnings as errors that don’t prevent the compiler from finishing its job.)

    And the way you fix it is to fix your code. This has nothing to do with the makefile. Delete the variable ‘p’ from line 322 in ./include/algparam.h. (There was a bit of a hint in the warning message from the compiler.)

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