Wrong AC_PROG_LN_S test on MSYS with 2.68

[daniel . f . starke]

Dear Sir or Madam,
 
running autoconf (GNU Autoconf) 2.68 obtained from
http://sourceforge.net/projects/mingw/files/MinGW/Extension/autoconf/autoconf2.5/autoconf2.5-2.68-1/
with the following configure.ac:
 
AC_PREREQ(2.64)
AC_INIT
AC_PROG_LN_S
 
leads to a wrongly created configure file that contains:
 
if (echo >conf$$.file) 2>/dev/null; then
 if ln -s conf$$.file conf$$ 2>/dev/null; then
 as_ln_s='ln -s'
 # ... but there are two gotchas:
 # 1) On MSYS, both `ln -s file dir' and `ln file dir' fail.
 # 2) DJGPP < 2.04 has no symlinks; `ln -s' .
 # In both cases, we have to default to `cp -p'.
 ln -s conf$$.file conf$$.dir 2>/dev/null && test ! -f conf$$.exe ||
 as_ln_s='cp -p'
 elif ln conf$$.file conf$$ 2>/dev/null; then
 as_ln_s=ln
 else
 as_ln_s='cp -p'
 fi
else
 as_ln_s='cp -p'
fi
 
This is wrong as cp -p does not replace ln or ln -s on MSYS for directories. A 
better replacement could be cp -pr.
Please consider this change in the upcoming releases.
 
Best regards,
Daniel Starke


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