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configure.ac: fix bashism in CXXFLAGS assignment

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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.

Fixes configure warnings/errors like:
```
checking whether make supports nested variables... (cached) yes
configure: 3698: CXXFLAGS+= -Ofast: not found
```

Signed-off-by: Sam James <sam@gentoo.org>
This commit is contained in:
Sam James 2024-03-24 07:19:34 +00:00
parent 17b63eeb3e
commit ba1cb7727e
1 changed files with 1 additions and 1 deletions
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configure.ac
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@ -33,7 +33,7 @@ AC_LANG(C++)
# Compiler flags. Apply -Ofast (implies -O3 -ffast-math) to allow gcc autovectorization
# generate effective SIMD code.
CXXFLAGS+=" -Ofast -Wall -Wextra -Wzero-as-null-pointer-constant -Wno-unknown-pragmas"
CXXFLAGS="${CXXFLAGS} -Ofast -Wall -Wextra -Wzero-as-null-pointer-constant -Wno-unknown-pragmas"
# Set AR_FLAGS to avoid build warning "ar: `u' modifier ignored since `D' is the default (see `U')"
AR_FLAGS='cr'