rust: avoid clobbering LIBS

Save LIBS around calls to AC_SEARCH_LIBS to avoid clobbering $LIBS.

ChangeLog:

	* configure: Regenerate.
	* configure.ac: Save LIBS around calls to AC_SEARCH_LIBS.

Signed-off-by: Marc Poulhiès <[email protected]>
Reviewed-by: Thomas Schwinge <[email protected]>
Tested-by: Thomas Schwinge <[email protected]>

configure

@@ -8829,9 +8829,12 @@ fi
 
 # Rust requires -ldl and -lpthread if you are using an old glibc that does not include them by
 # default, so we check for them here
-
+# We are doing the test here and not in the gcc/configure to be able to nicely disable the
+# build of the Rust frontend in case a dep is missing.
 missing_rust_dynlibs=none
 
+save_LIBS="$LIBS"
+LIBS=
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing dlopen" >&5
 $as_echo_n "checking for library containing dlopen... " >&6; }
 if ${ac_cv_search_dlopen+:} false; then :
@@ -8944,16 +8947,14 @@ if test "$ac_res" != no; then :
 
 fi
 
+CRAB1_LIBS="$LIBS"
+LIBS="$save_LIBS"
 
-if test $ac_cv_search_dlopen = -ldl; then
-    CRAB1_LIBS="$CRAB1_LIBS -ldl"
-elif test $ac_cv_search_dlopen = no; then
+if test "$ac_cv_search_dlopen" = no; then
     missing_rust_dynlibs="libdl"
 fi
 
-if test $ac_cv_search_pthread_create = -lpthread; then
-    CRAB1_LIBS="$CRAB1_LIBS -lpthread"
-elif test $ac_cv_search_pthread_crate = no; then
+if test "$ac_cv_search_pthread_create" = no; then
     missing_rust_dynlibs="$missing_rust_dynlibs, libpthread"
 fi
 

configure.ac

@@ -2038,21 +2038,22 @@ AC_SUBST(PICFLAG)
 
 # Rust requires -ldl and -lpthread if you are using an old glibc that does not include them by
 # default, so we check for them here
-
+# We are doing the test here and not in the gcc/configure to be able to nicely disable the
+# build of the Rust frontend in case a dep is missing.
 missing_rust_dynlibs=none
 
+save_LIBS="$LIBS"
+LIBS=
 AC_SEARCH_LIBS([dlopen], [dl])
 AC_SEARCH_LIBS([pthread_create], [pthread])
+CRAB1_LIBS="$LIBS"
+LIBS="$save_LIBS"
 
-if test $ac_cv_search_dlopen = -ldl; then
-    CRAB1_LIBS="$CRAB1_LIBS -ldl"
-elif test $ac_cv_search_dlopen = no; then
+if test "$ac_cv_search_dlopen" = no; then
     missing_rust_dynlibs="libdl"
 fi
 
-if test $ac_cv_search_pthread_create = -lpthread; then
-    CRAB1_LIBS="$CRAB1_LIBS -lpthread"
-elif test $ac_cv_search_pthread_crate = no; then
+if test "$ac_cv_search_pthread_create" = no; then
     missing_rust_dynlibs="$missing_rust_dynlibs, libpthread"
 fi