rpm - Why is topdir set to its default value when rpmbuild called from tcl?

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I have a tcl script which 'exec' rpmbuild. When doing so, the 'topdir' used by rpmbuild is wrong. I have a .rpmmacros file in my home directory and if I call manually rpmbuild, it works fine, ie. the 'topdir' is not the default one.

I added a [exec rpmbuild "--showrc" ] in the tcl script to check the value of topdir and it says '-14: _topdir %{_usrsrc}/redhat' which is the default value.

Can someone explain me why is that situation and how to solve it ?

I would prefer not to have to specify it with --define because it is actually done in a makefile and I don't want to touch it (if no other choice, I will do it).

Per-User: By configuring the RPM topdir in $HOME/.rpmmacros

%_topdir    %{getenv:HOME}/rpmbuild
Per-Project: By configuring the RPM topdir in the Makefile or on the command line
rpmbuild --define '_topdir build' -ba package.spec
Note: in both cases, you will need to make sure your topdir directory has the appropriate directories (BUILD, SRPM, RPM, SPECS and SOURCES)
                awesome.  "--define '_topdir xxxxx'" is the most underdocumented piece of rpm lore.  I've been searching for this for ages.
– Dave Dopson
                Nov 1, 2011 at 20:19
                I had issues using a relative path; I think it's best to always have this be an abs directory (eg: topdir=pwd/../foo)
– Blaskovicz
                Jul 24, 2014 at 19:04
To see what are the paths being used !
Make this change (my topdir was NOT set to /usr/src/):
vi  /usr/lib/rpm/macros
#       Path to top of build area.
#%_topdir               %{getenv:HOME}/rpmbuild
%_topdir                %{_usrsrc}/redhat
rpm --showrc|grep topdir    now shows   /usr/src/redhat/ as its BUILD dir
TCL will exec in the current directory by default. You can change the current directory by using the TCL command http://www.tcl.tk/man/tcl8.4/TclCmd/cd.htm cd, for example:
cd ~username
If topdir is an environment variable, you might be able to set it http://www.tcl.tk/man/tcl8.4/TclCmd/tclvars.htm#M4 like this:
set env(topdir) whatever/you/want
My first check would be to make sure you execute the same thing.
Do these two on the command line to make sure aliases or paths
do not disturb anything.
which rpmbuild
echo 'puts [auto_execok rpmbuild]' | tclsh
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