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configure.ac: fix bashism

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configure scripts need to be runnable with a POSIX-compliant /bin/sh.

On many (but not all!) systems, /bin/sh is provided by Bash, so errors
like this aren't spotted. Notably Debian defaults to /bin/sh provided
by dash which doesn't tolerate such bashisms as '+='.

This retains compatibility with bash. Just copy the expanded append like
we do on the line above.

Fixes warnings like:
```
./configure: 13352: CFLAGS+= -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2: not found
```
This commit is contained in:
Sam James 2023-12-29 00:38:40 +00:00 committed by Denis Kenzior
parent e89ba32d30
commit ba9717d445
1 changed files with 1 additions and 1 deletions
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configure.ac
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@ -44,7 +44,7 @@ AC_ARG_ENABLE(optimization, AS_HELP_STRING([--disable-optimization],
if (test "${enable_optimization}" != "no"); then
CFLAGS="$CFLAGS -O2"
CFLAGS+=" -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2"
CFLAGS="$CFLAGS -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2"
fi
AC_ARG_ENABLE(debug, AS_HELP_STRING([--enable-debug],