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CXXFLAGS without -O don't work. Thomas Roessler had the painful experience.

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Bruno Haible 25 years ago
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      doc/cln.tex

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@ -386,6 +386,10 @@ commands, you have to @code{export} the environment variables before
calling @code{configure}. In a @code{csh} shell, you have to use the calling @code{configure}. In a @code{csh} shell, you have to use the
@samp{setenv} command for setting each of the environment variables. @samp{setenv} command for setting each of the environment variables.
Currently CLN works only with the GNU @code{g++} compiler, and only in
optimizing mode. So you should specify at least @code{-O} in the CXXFLAGS,
or no CXXFLAGS at all. (If CXXFLAGS is not set, CLN will use @code{-O}.)
On Linux, @code{g++} needs 15 MB to compile the tests. So you should better On Linux, @code{g++} needs 15 MB to compile the tests. So you should better
have 17 MB swap space and 1 MB room in $TMPDIR. have 17 MB swap space and 1 MB room in $TMPDIR.

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