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From: Jaroslav Škarvada on 16 Feb 2010 06:29
I have encountered problem with APPENDDEF, PREPENDDEF macros, when
used with arguments containing commas:

....
define(`confOPTIMIZE', `-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2')
....
APPENDDEF(`confOPTIMIZE', `-DSM_CONF_SHM=0')
....

When building with the above config, the build fails due to comma
after the '-Wp'. It needs four time nested quoting in first define in
order to work correctly. I am not m4 expert, but I think the
APPENDDEF, PREPENDDEF macros definitions need some more quoting such
as:

$ diff ./devtools/M4/header.m4.orig ./devtools/M4/header.m4
35,36c35,37
< define(`APPENDDEF', `define(`$1', ifdef(`$1', `$1 $2', `$2'))')
< define(`PREPENDDEF', `define(`$1', ifdef(`$1', `$2 $1', `$2'))')
---
> define(`quote', `ifelse(`$#', `0', `', ``$*'')')
> define(`APPENDDEF', `define(`$1', quote(ifdef(`$1', `$1 $2', `$2')))')
> define(`PREPENDDEF', `define(`$1', quote(ifdef(`$1', `$2 $1', `$2')))')

I am not sure for possible side effects of this particular solution
(none encountered so far), but the idea behind should be clear.
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