Re: Additional environment information with make 4

[Markus Fischer]

On 25.02.2015 17:03, Paul Smith wrote:
> Or do you mean that when make invokes a program it places this into the
> environment of the program?

Yes, that was what I meant.
> 
> You'll have to be much more specific before we can help... as always a
> short example makefile, along with command line you invoked, the result
> you got (cut/paste) and an explanation of what is wrong with it or what
> you expected to get, is best.
> 
> In any event, I ran this simple makefile:
> 
>    all: ; env | sort
> 
> and looked at the output and I didn't see anything in the environment
> that shouldn't be there.
> 

I made a minimal example, here is the program I invoke with make along
with the makefile:

#### main.cpp ####
#include <stdio.h>

extern char** environ;

int main (int argc, char** argv)
{
  char* entry = 0;
  int i = 0;
  while ((entry = environ[i++]))
    printf("%s\n", entry);
  fflush(stdout);
  return 0;
}

#### makefile ####
all:
        @g++ -o example main.cpp

run:
        ./example

#### output ####
$ make && make run
./example
DESKTOP_SESSION=KDE-4
KONSOLE_DBUS_WINDOW=/Windows/1
GTK_RC_FILES=/etc/gtk/gtkrc:/home/mjf/.gtkrc:/home/mjf/.kde4/share/config/gtkrc
SHELL=/bin/bash
_=/usr/bin/make
....

If I run ./example directly from the shell I don't get this "./example"
entry. I expect the same output when run with make. In this minimal
example I also get the string "./example" with make 3.82, though. I
haven't looked into it further, why in my actual program this happens
only with make 4, but either way it would be interesting to know why it
is there at all.