fix #81656: GCC-11 silently ignores -R

Closes GH-7688.

NEWS

@@ -2,6 +2,8 @@ PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? 2022, PHP 8.0.15
 
+- Core:
+  . Fixed bug #81656 (GCC-11 silently ignores -R). (Michael Wallner)
 
 16 Dec 2021, PHP 8.0.14
 

build/php.m4

@@ -275,25 +275,25 @@ dnl
 dnl Checks for -R, etc. switch.
 dnl
 AC_DEFUN([PHP_RUNPATH_SWITCH],[
-AC_MSG_CHECKING([if compiler supports -R])
-AC_CACHE_VAL(php_cv_cc_dashr,[
+AC_MSG_CHECKING([if compiler supports -Wl,-rpath,])
+AC_CACHE_VAL(php_cv_cc_rpath,[
   SAVE_LIBS=$LIBS
-  LIBS="-R /usr/$PHP_LIBDIR $LIBS"
-  AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],[php_cv_cc_dashr=yes],[php_cv_cc_dashr=no])
+  LIBS="-Wl,-rpath,/usr/$PHP_LIBDIR $LIBS"
+  AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],[php_cv_cc_rpath=yes],[php_cv_cc_rpath=no])
   LIBS=$SAVE_LIBS])
-AC_MSG_RESULT([$php_cv_cc_dashr])
-if test $php_cv_cc_dashr = "yes"; then
-  ld_runpath_switch=-R
+AC_MSG_RESULT([$php_cv_cc_rpath])
+if test $php_cv_cc_rpath = "yes"; then
+  ld_runpath_switch=-Wl,-rpath,
 else
-  AC_MSG_CHECKING([if compiler supports -Wl,-rpath,])
-  AC_CACHE_VAL(php_cv_cc_rpath,[
+  AC_MSG_CHECKING([if compiler supports -R])
+  AC_CACHE_VAL(php_cv_cc_dashr,[
     SAVE_LIBS=$LIBS
-    LIBS="-Wl,-rpath,/usr/$PHP_LIBDIR $LIBS"
-    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],[php_cv_cc_rpath=yes],[php_cv_cc_rpath=no])
+    LIBS="-R /usr/$PHP_LIBDIR $LIBS"
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],[php_cv_cc_dashr=yes],[php_cv_cc_dashr=no])
     LIBS=$SAVE_LIBS])
-  AC_MSG_RESULT([$php_cv_cc_rpath])
-  if test $php_cv_cc_rpath = "yes"; then
-    ld_runpath_switch=-Wl,-rpath,
+  AC_MSG_RESULT([$php_cv_cc_dashr])
+  if test $php_cv_cc_dashr = "yes"; then
+    ld_runpath_switch=-R
   else
     dnl Something innocuous.
     ld_runpath_switch=-L