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Fix _AS_DETECT_BETTER_SHELL breakage

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Problem reported by Zack Weinberg in:
https://lists.gnu.org/r/autoconf/2020-03/msg00017.html
* lib/m4sugar/m4sh.m4 (_AS_RUN): Use sh -c instead of
the no-longer-existent $as_echo.  This fixes a bug introduced
in 2013-01-28T03:44:45Z!gary@gnu.org.
This commit is contained in:
Paul Eggert 2020-03-12 17:00:44 -07:00
parent 8dcc5babcd
commit 9894c7b5ba
1 changed files with 1 additions and 1 deletions
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lib/m4sugar/m4sh.m4
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@ -418,7 +418,7 @@ m4_default_quoted([$4], [M4SH-INIT-FN]))])])
# or under the given SHELL, protecting it from syntax errors.
# Set as_run in order to assist _AS_LINENO_WORKS.
m4_define([_AS_RUN],
[m4_ifval([$2], [{ $as_echo "$as_bourne_compatible"$1 | as_run=a $2; }],
[m4_ifval([$2], [as_run=a $2 -c "$as_bourne_compatible"$1],
[(eval $1)]) 2>/dev/null])