Make

Conan provides integration with plain Makefiles by means of the make generator. If you are using Makefile to build your project you could get the information of the dependencies in a conanbuildinfo.mak file. All you have to do is indicate the generator like this:

conanfile.txt
 [generators]
 make
conanfile.py
 class MyConan(ConanFile):
     ...
     generators = "make"

Example

We are going to use the same example from Getting Started, a MD5 hash calculator app.

This is the main source file for it:

main.cpp
 #include "Poco/MD5Engine.h"
 #include "Poco/DigestStream.h"

 #include <iostream>


 int main(int argc, char** argv)
 {
     Poco::MD5Engine md5;
     Poco::DigestOutputStream ds(md5);
     ds << "abcdefghijklmnopqrstuvwxyz";
     ds.close();
     std::cout << Poco::DigestEngine::digestToHex(md5.digest()) << std::endl;
     return 0;
 }

As this project relies on the Poco Libraries we are going to create a conanfile.txt with our requirement and also declare the Make generator:

conanfile.txt
 [requires]
 poco/1.9.4

 [generators]
 make

In order to use this generator within your project, use the following Makefile as a reference:

Makefile
 include conanbuildinfo.mak

 #----------------------------------------
 #     Make variables for a sample App
 #----------------------------------------

 CXX_SRCS = \
 main.cpp

 CXX_OBJ_FILES = \
 main.o

 EXE_FILENAME = \
 main


 #----------------------------------------
 #     Prepare flags from variables
 #----------------------------------------

 CFLAGS          += $(CONAN_CFLAGS)
 CXXFLAGS        += $(CONAN_CXXFLAGS)
 CPPFLAGS        += $(addprefix -I, $(CONAN_INCLUDE_DIRS))
 CPPFLAGS        += $(addprefix -D, $(CONAN_DEFINES))
 LDFLAGS         += $(addprefix -L, $(CONAN_LIB_DIRS))
 LDLIBS          += $(addprefix -l, $(CONAN_LIBS))


 #----------------------------------------
 #     Make Commands
 #----------------------------------------

 COMPILE_CXX_COMMAND         ?= \
     g++ -c $(CPPFLAGS) $(CXXFLAGS) $< -o $@

 CREATE_EXE_COMMAND          ?= \
     g++ $(CXX_OBJ_FILES) \
     $(CXXFLAGS) $(LDFLAGS) $(LDLIBS) \
     -o $(EXE_FILENAME)


 #----------------------------------------
 #     Make Rules
 #----------------------------------------

 .PHONY                  :   exe
 exe                     :   $(EXE_FILENAME)

 $(EXE_FILENAME)         :   $(CXX_OBJ_FILES)
     $(CREATE_EXE_COMMAND)

 %.o                     :   $(CXX_SRCS)
     $(COMPILE_CXX_COMMAND)

Now we are going to let Conan retrieve the dependencies and generate the dependency information in a conanbuildinfo.mak:

$ conan install .

Then let’s call make to generate our project:

$ make exe

Now you can run your application with ./main.

See also

Check the complete reference of the Make generator.