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build: fix searching dlopen in configure

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The 4th argument of AC_SEARCH_LIBS is a list of additional libraries,
not the name of the variable to hold the result which is always
ac_cv_search_$function. Also, we should ignore the result when it is
"none required".

Fixes: 1f2eeb85d8 ('build: rename $(LIBDL) to $(DL_LIBS) and modify detection')
(cherry picked from commit bd4957fcd7)
This commit is contained in:
Beniamino Galvani 2019-03-29 09:13:59 +01:00
parent 8ec0954570
commit 1fa0914b17
1 changed files with 3 additions and 2 deletions
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5
configure.ac
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@ -240,8 +240,9 @@ AM_CONDITIONAL(WITH_IWD, test x"${ac_with_iwd}" = x"yes")
dnl
dnl Checks for libdl - on certain platforms its part of libc
dnl
AC_SEARCH_LIBS([dlopen], [dl dld], [], [ac_cv_search_dlopen=])
AC_SUBST([DL_LIBS], "$ac_cv_search_dlopen")
AC_SEARCH_LIBS([dlopen], [dl dld],
[test "$ac_cv_search_dlopen" = "none required" || AC_SUBST([DL_LIBS], "$ac_cv_search_dlopen"]),
[])
PKG_CHECK_MODULES(GLIB, [gio-unix-2.0 >= 2.37.6 gmodule-2.0],
[AC_SUBST(LOG_DRIVER, '$(top_srcdir)/build-aux/tap-driver.sh')