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https://github.com/HDFGroup/hdf5/commit/9dd36f016a4316b94f5df15856d228de01d304c6
From 9dd36f016a4316b94f5df15856d228de01d304c6 Mon Sep 17 00:00:00 2001
From: Ryan Schmidt <ryandesign@macports.org>
Date: Thu, 17 Nov 2022 16:28:44 -0600
Subject: [PATCH] Simplify & fix check for szlib encoder (#2263)
Return the result rather than setting the exit code. "return" is a
language keyword whereas "exit" is a function for which the <stdlib.h>
header has to be included which it wasn't in this test, therefore the
test would previously fail to identify that the encoder was enabled if
"-Werror=implicit-function-declaration" was used, which it is by default
with clang from Xcode 12 and later.
Fixes #2262
--- a/configure.ac
+++ b/configure.ac
@@ -1737,10 +1737,7 @@ if test "x$HAVE_SZLIB" = "xyes" -a "x$HAVE_SZLIB_H" = "xyes"; then
#include "szlib.h"
],[[
/* SZ_encoder_enabled returns 1 if encoder is present */
- if(SZ_encoder_enabled() == 1)
- exit(0);
- else
- exit(1);
+ return SZ_encoder_enabled() != 1;
]])]
, [hdf5_cv_szlib_can_encode=yes], [hdf5_cv_szlib_can_encode=no],)]
)
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