[patch #8452] Add AX_DEBUG_CHECK macro for --enable-debug option

Follow-up Comment #1, patch #8452 (project autoconf-archive):

I've found a couple of things to be useful in my own versions of such macros. 
You may/may not want to include them here, but I figured I'd share my
experience.

1) Take --enable-debug=no/info/profile/yes with '', '-g', '-g -pg', '-g -O0'
being added into {C,CXX,F,FC,OBJC}FLAGS as a result.
2) Permit controlling what the default behavior of the macro is through an
optional argument.
3) Be careful about where the macro can be used relative to compiler checks so
that it can influence the default compilation flags.
4) Call the resulting define NDEBUG rather than ENABLE_DEBUG so that it turns
off assert calls automatically.

I have attached an example implementing these things.  Like I said, please
adopt these ideas if you see fit.

- Rhys

(file #31356)
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Additional Item Attachment:

File name: ax_check_enable_debug.m4       Size:3 KB


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