R-patched and R-devel

If I configure in R-patched and R-devel, with the same options to
configure, then R-patched says

checking for ATL_xerbla in -latlas... yes
checking for cblas_dgemm in -lcblas... yes
checking for dgemm_ in -lf77blas... yes

which R-devel says

checking for ATL_xerbla in -latlas... yes
checking for cblas_dgemm in -lcblas... yes
checking for dgemm in -lf77blas... no

This is on the same computer and using the same libraries. Observe
in R-patched we check for dgemm_ and in R-devel for dgemm. Is that
what is intended ?

Confirmed here. It seems related to the change to autoconf 2.5x,
but it is not working as intended.  The configure code has

if test "${r_cv_prog_f77_append_underscore}" = yes \
  || test -n "${F2C}"; then
  dgemm_func=dgemm_
else
  dgemm_func=dgemm
fi
...
    AC_CHECK_LIB(f77blas, $dgemm_func,
                 BLAS_LIBS="-lf77blas $BLAS_LIBS", , $BLAS_LIBS $FLIBS)

and r_cv_prog_f77_append_underscore is being set correctly, but only later
in the configure.  I think that comes from following the autoconf
recommended order of tests (libraries, headers, ...), but we need an
exception here.

Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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