[Maxima-bugs] [maxima:bugs] #4094 Build warning in share: grep: warning: stray \ before #

[David B. <bil...@us...>]

Wolfgang Dautermann reverted this in commit [e00f35] with message

    Build system: Escape '#' in $(shell ...) command.
    
    Otherwise the build with GNU Make <= 4.2 fails, see
    https://stackoverflow.com/questions/53836858/
    
    And GNU Make 4.2.1 is included in Ubuntu 20.04 so it may be in
    use for some years, the distribution is supported until 2025.


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** [bugs:#4094] Build warning in share: grep: warning: stray \ before #**

**Status:** closed
**Group:** None
**Created:** Mon Jan 30, 2023 11:33 AM UTC by David Billinghurst
**Last Updated:** Sun Feb 05, 2023 01:24 AM UTC
**Owner:** David Billinghurst


There are several harmless build warnings in the share subdirectory.

~~~
grep: warning: stray \ before #
~~~

It is generated in the system call to generate make variable sharefiles.  A web search didn't find any need to escape '#' in an extended grep regex.

The fix is trivial.  Tested  with GNU egrep.  I wonder if it will be a problem with other versions of egrep.

~~~
diff --git a/share/Makefile.am b/share/Makefile.am
index f56124228..5681b5872 100644
--- a/share/Makefile.am
+++ b/share/Makefile.am
@@ -7,8 +7,8 @@ egrep -v 'CVS|Makefile(\.in|\.am)?|^\./Makefile|\.gitignore|\.gitattributes' | \
 egrep -v '/fortran/' | \
 egrep -v 'colnew/ex./' | \
 egrep -v 'lbfgs/.*\.f' | \
-egrep -v '/\.\#' | \
-egrep -v '~|\#' | \
+egrep -v '/\.#' | \
+egrep -v '~|#' | \
 sed -e 's%\./%%' | \
 sort -f -d | \
 sed '$$s/\\$$//' )
~~~


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