[bug] Makefile won't build successfully

Environment Details (include every applicable attribute)

• Operating System+version: Ubuntu 20.04
• Compiler+version: g++ 9.3.0
• Conan version: 1.38.0
• Python version: 3.8.10

Steps to reproduce (Include if Applicable)

Follow the official Doc to build with Makefile generator. https://docs.conan.io/en/latest/integrations/build_system/make.html

conanfile.txt

[requires]
poco/1.9.4

[generators]
make

Makefile

 #----------------------------------------
 #     Prepare flags from make generator
 #----------------------------------------

 include conanbuildinfo.mak
 $(call CONAN_BASIC_SETUP)

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

 SRCS          = main.cpp
 OBJS          = main.o
 EXE_FILENAME  = main

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

 .PHONY                  :   exe
 exe                     :   $(EXE_FILENAME)

 $(EXE_FILENAME)         :   $(OBJS)
	g++ $(OBJS) $(CXXFLAGS) $(LDFLAGS) $(LDLIBS) -o $(EXE_FILENAME)

 %.o                     :   $(SRCS)
	g++ -c $(CPPFLAGS) $(CXXFLAGS) $< -o $@

Code

#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;
}

Steps

1. conan install .
2. make exe

Logs (Executed commands with output) (Include/Attach if Applicable)

[memsharded]

I have been checking previous Conan versions down to Conan 1.20.

Apparently, the magic of $(call CONAN_BASIC_SETUP) was never implemented in this generator, only in the MakeToolchain in https://github.com/conan-io/conan/pull/7430, and then, the documentation was incorrectly changed.

So I’d suggest:

• Fixing the docs of the legacy Makefile generator to reflect this
• As the docs already have a note to move to the new Autotools integration, that is fine.
• If necessary to work with the legacy Makefile generator, the way to go would be to add the necessary CONAN_ variables from the generated .mak file into the Makefile itself (this generator was always intended for this usage, completely explicit).

[ibmboy19]

Thanks @memsharded ! Have modified Makefile according to the old doc, and it works now!

https://raw.githubusercontent.com/conan-io/docs/release/1.19.0/integrations/build_system/make.rst