gdbsupport: replace AC_TRY_COMPILE in warning.m4

Replace AC_TRY_COMPILE with AC_COMPILE_IFELSE + AC_LANG_PROGRAM.

All changes in generated configure files are insignificant whitespace
changes.

gdb/ChangeLog:

	* configure: Re-generate.

gdbserver/ChangeLog:

	* configure: Re-generate.

gdbsupport/ChangeLog:

	* configure: Re-generate.
	* warning.m4: Replace AC_TRY_COMPILE with AC_COMPILE_IFELSE +
	AC_LANG_PROGRAM.

Change-Id: I517bd20ec3af960ad999a586761df0ac8959a3fc

gdb/ChangeLog

@@ -6,6 +6,10 @@
 
 	* configure: Re-generate.
 
+2020-10-31  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* configure: Re-generate.
+
 2020-10-31  Simon Marchi  <simon.marchi@polymtl.ca>
 
 	* acinclude.m4: Modernize.

gdb/configure

@@ -16563,13 +16563,14 @@ $as_echo_n "checking compiler warning flags... " >&6; }
 	      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 struct scoped_restore_base {};
-                 struct scoped_restore_tmpl : public scoped_restore_base {
-		   ~scoped_restore_tmpl() {}
-		 };
+		    struct scoped_restore_tmpl : public scoped_restore_base {
+		      ~scoped_restore_tmpl() {}
+		    };
 int
 main ()
 {
 const scoped_restore_base &b = scoped_restore_tmpl();
+
   ;
   return 0;
 }

gdbserver/ChangeLog

@@ -6,6 +6,10 @@
 
 	* configure: Re-generate.
 
+2020-10-31  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* configure: Re-generate.
+
 2020-10-31  Simon Marchi  <simon.marchi@polymtl.ca>
 
 	* configure.ac: Modernize.

gdbserver/configure

@@ -9820,13 +9820,14 @@ $as_echo_n "checking compiler warning flags... " >&6; }
 	      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 struct scoped_restore_base {};
-                 struct scoped_restore_tmpl : public scoped_restore_base {
-		   ~scoped_restore_tmpl() {}
-		 };
+		    struct scoped_restore_tmpl : public scoped_restore_base {
+		      ~scoped_restore_tmpl() {}
+		    };
 int
 main ()
 {
 const scoped_restore_base &b = scoped_restore_tmpl();
+
   ;
   return 0;
 }

gdbsupport/ChangeLog

@@ -1,3 +1,9 @@
+2020-10-31  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* configure: Re-generate.
+	* warning.m4: Replace AC_TRY_COMPILE with AC_COMPILE_IFELSE +
+	AC_LANG_PROGRAM.
+
 2020-10-31  Simon Marchi  <simon.marchi@polymtl.ca>
 
 	* configure: Re-generate.

gdbsupport/configure

@@ -10306,13 +10306,14 @@ $as_echo_n "checking compiler warning flags... " >&6; }
 	      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 struct scoped_restore_base {};
-                 struct scoped_restore_tmpl : public scoped_restore_base {
-		   ~scoped_restore_tmpl() {}
-		 };
+		    struct scoped_restore_tmpl : public scoped_restore_base {
+		      ~scoped_restore_tmpl() {}
+		    };
 int
 main ()
 {
 const scoped_restore_base &b = scoped_restore_tmpl();
+
   ;
   return 0;
 }

gdbsupport/warning.m4

@@ -139,15 +139,23 @@ then
 	      # Check for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38958,
 	      # fixed in GCC 4.9.  This test is derived from the gdb
 	      # source code that triggered this bug in GCC.
-	      AC_TRY_COMPILE(
-	        [struct scoped_restore_base {};
-                 struct scoped_restore_tmpl : public scoped_restore_base {
-		   ~scoped_restore_tmpl() {}
-		 };],
-		[const scoped_restore_base &b = scoped_restore_tmpl();],
-		WARN_CFLAGS="${WARN_CFLAGS} $w",)
+	      AC_COMPILE_IFELSE(
+		[AC_LANG_PROGRAM(
+		   [struct scoped_restore_base {};
+		    struct scoped_restore_tmpl : public scoped_restore_base {
+		      ~scoped_restore_tmpl() {}
+		    };],
+		   [const scoped_restore_base &b = scoped_restore_tmpl();]
+		 )],
+		[WARN_CFLAGS="${WARN_CFLAGS} $w"],
+		[]
+	      )
 	    else
-	      AC_TRY_COMPILE([],[],WARN_CFLAGS="${WARN_CFLAGS} $w",)
+	      AC_COMPILE_IFELSE(
+		[AC_LANG_PROGRAM([], [])],
+		[WARN_CFLAGS="${WARN_CFLAGS} $w"],
+		[]
+	      )
 	    fi
 	    CFLAGS="$saved_CFLAGS"
 	    CXXFLAGS="$saved_CXXFLAGS"