[gcc r15-3443] rust: avoid clobbering LIBS

[Marc Poulhi?s via Gcc-cvs]

https://gcc.gnu.org/g:da3a2985fff39ee8ec1b9f48699e3b8197e439e6

commit r15-3443-gda3a2985fff39ee8ec1b9f48699e3b8197e439e6
Author: Marc Poulhiès <d...@kataplop.net>
Date:   Mon Aug 5 17:41:17 2024 +0200

    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 <d...@kataplop.net>
    Reviewed-by: Thomas Schwinge <tschwi...@baylibre.com>
    Tested-by: Thomas Schwinge <tschwi...@baylibre.com>

Diff:
---
 configure    | 15 ++++++++-------
 configure.ac | 15 ++++++++-------
 2 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/configure b/configure
index 51bf1d1add1..e9583f2ba0c 100755
--- a/configure
+++ b/configure
@@ -8878,9 +8878,12 @@ 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 ${ac_cv_search_dlopen+:} false; then :
@@ -8993,16 +8996,14 @@ if test "$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 "$ac_cv_search_pthread_create" = no; then
+if test "$ac_cv_search_pthread_create" = no; then
     missing_rust_dynlibs="$missing_rust_dynlibs, libpthread"
 fi
 
diff --git a/configure.ac b/configure.ac
index 20457005e29..f61dbe64a94 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2039,21 +2039,22 @@ 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 "$ac_cv_search_pthread_create" = no; then
+if test "$ac_cv_search_pthread_create" = no; then
     missing_rust_dynlibs="$missing_rust_dynlibs, libpthread"
 fi