When automake is configured to use DejaGNU, it uses two different values
for srcdir. There are two different cases in lib/am/dejagnu.am:
The first is in check-DEJAGNU:
check-DEJAGNU: site.exp
## Life is easiest with an absolute srcdir, so do that.
srcdir=`$(am__cd) $(srcdir) && pwd`; export srcdir; \
This value is passed to runtest with a --srcdir option.
The second is in site.exp:
site.exp: Makefile
@echo 'Making a new site.exp file...'
@echo '## these variables are automatically generated by make ##'
>site.tmp
@echo '# Do not edit here. If you wish to override these values'
>>site.tmp
@echo '# edit the last section' >>site.tmp
@echo 'set srcdir $(srcdir)' >>site.tmp
This value is read by DejaGNU after option processing is complete,
effectively overwriting the value passed with the --srcdir option.
The value of srcdir stored in site.exp should be an absolute path, just
like the value passed to runtest via --srcdir.
Ian
