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# libdl.m4
# serial 3
dnl Copyright (C) 2024-2026 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl This file is offered as-is, without any warranty.
dnl From Bruno Haible.
dnl Set LIBDL to '-ldl' if it is needed to use the functions declared
dnl in <dlfcn.h> (dlopen, dlsym, etc.), or to empty otherwise.
AC_DEFUN([gl_LIBDL],
[
dnl dlopen, dlsym are
dnl - in libc on glibc >= 2.34, musl libc, macOS, FreeBSD, NetBSD, OpenBSD,
dnl AIX, Solaris, Cygwin, Haiku,
dnl - in a separate libdl on glibc < 2.34, uClibc, Android.
AC_CACHE_CHECK([for library needed for dlopen and dlsym],
[gl_cv_lib_dl],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <dlfcn.h>
]],
[[return ! dlsym (RTLD_DEFAULT, "main");]])],
[gl_cv_lib_dl=none],
[gl_cv_lib_dl=maybe])
if test $gl_cv_lib_dl = maybe; then
saved_LIBS="$LIBS"
LIBS="$LIBS -ldl"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <dlfcn.h>
]],
[[return ! dlsym (RTLD_DEFAULT, "main");]])],
[gl_cv_lib_dl='-ldl'],
[gl_cv_lib_dl=none])
LIBS="$saved_LIBS"
fi
])
case "$gl_cv_lib_dl" in
none) LIBDL='' ;;
*) LIBDL="$gl_cv_lib_dl" ;;
esac
AC_SUBST([LIBDL])
])
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