[sr #110324] autoupdate does some nonsensical changes

[Eric Gallager]

Follow-up Comment #2, sr #110324 (project autoconf):

I've noticed a bunch of these, too:

1) Nested AC_TRY_COMPILE/AC_TRY_LINK/AC_TRY_RUN invocations lead to stray
_au_m4_changequote([,])s when being autoupdated to
AC_COMPILE_IF_ELSE/AC_LINK_IF_ELSE/AC_RUN_IF_ELSE
2) Macros in comments get expanded even when the new output spreads across
more lines, meaning that stuff that ought to stay in a comment no longer is
3) Stuff inside AC_REQUIRE gets autoupdated even when that breaks the usage of
AC_REQUIRE (similar to the previous)
4) If someone had been writing their configure.ac to abide by certain style
rules (e.g. 80-character line limits), autoupdate will ignore those and
reformat things

I've been noticing a bunch of these while autoupdating various stuff over the
years but am only getting around to writing them down as of my beginning of
work on autoupdating the GCC configury as per this bug:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103459

Should I open separate bugs for each additional item that I notice, or just
continue to catalogue them here?



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