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[Octave-bug-tracker] [bug #57042] __octave_config_info__.build_features.

From: Mike Miller
Subject: [Octave-bug-tracker] [bug #57042] __octave_config_info__.build_features.LAPACK = 0
Date: Fri, 11 Oct 2019 16:20:43 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36

Follow-up Comment #6, bug #57042 (project octave):

jwe - the macros are defined by AC_DEFINE in an m4_ifelse conditional in
ax_blas.m4 and ax_lapack.m4. We pass an argument to both the AX_BLAS and
AX_LAPACK macros, so those conditionals skip executing the AC_DEFINE
unconditionally, they are simply not expanded at all in the output configure
shell script.

However, when autoheader scans the input sources, it sees the AC_DEFINE and
stuffs HAVE_BLAS and HAVE_LAPACK into the config.in.h template, because it's
not smart enough to know that the AC_DEFINE will never be expanded by


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