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configure: Fix zlib detection #76

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Merged
patrick-irc merged 1 commit into from
Mar 22, 2026
Merged

configure: Fix zlib detection #76

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14 changes: 12 additions & 2 deletions support/configure
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Original file line number Diff line number Diff line change
Expand Up @@ -5526,10 +5526,20 @@ LIBS="-lz $LIBS"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */

/* Override any GCC internal prototype to avoid an error.
Use char because int might match the return type of a GCC
builtin and then its argument prototype would still apply.
The 'extern "C"' is for builds by C++ compilers;
although this is not generally supported in C code supporting it here
has little cost and some practical benefit (sr 110532). */
#ifdef __cplusplus
extern "C"
#endif
char inflate(void);
int
main ()
main (void)
{
inflate()
return inflate();
;
return 0;
}
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2 changes: 1 addition & 1 deletion support/configure.in
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Original file line number Diff line number Diff line change
Expand Up @@ -82,7 +82,7 @@ irc_zlib_include=],[for irc_dir in "$irc_zlib_include" \
])
irc_save_LIBS="$LIBS"
LIBS="-lz $LIBS"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[inflate()]])],[no_zlib_library=
AC_LINK_IFELSE([AC_LANG_CALL([], [inflate])],[no_zlib_library=
irc_zlib_library=
LIBS="$irc_save_LIBS"],[LIBS="$irc_save_LIBS"
for irc_dir in "$irc_zlib_library" \
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