[binutils-gdb] Fix gdbsupport build on compilers that don't default to C++11 or above

[Pedro Alves]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=67b10306d19bd16ec9f3ca73b14aa82c789436e1

commit 67b10306d19bd16ec9f3ca73b14aa82c789436e1
Author: Pedro Alves <palves@redhat.com>
Date:   Wed Jan 15 21:55:29 2020 +0000

    Fix gdbsupport build on compilers that don't default to C++11 or above
    
    gdbsupport fails to build with compilers that don't default to C++11
    or above.  gdbsupport's configure.ac is already using
    AX_CXX_COMPILE_STDCXX, which sets CXX_DIALECT to the -std=gnu++11
    switch if necessary, but the problem is that nowhere are we using
    CXX_DIALECT.  This fixes it.
    
    gdbsupport/ChangeLog:
    2020-01-17   Pedro Alves  <palves@redhat.com>
    
    	* Makefile.am: Append CXX_DIALECT to CXX.
    	* Makefile.in: Regenerate.

Diff:
---
 gdbsupport/ChangeLog   | 5 +++++
 gdbsupport/Makefile.am | 2 ++
 gdbsupport/Makefile.in | 2 ++
 3 files changed, 9 insertions(+)

diff --git a/gdbsupport/ChangeLog b/gdbsupport/ChangeLog
index e7a9027..3583e5b 100644
--- a/gdbsupport/ChangeLog
+++ b/gdbsupport/ChangeLog
@@ -1,3 +1,8 @@
+2020-01-17   Pedro Alves  <palves@redhat.com>
+
+	* Makefile.am: Append CXX_DIALECT to CXX.
+	* Makefile.in: Regenerate.
+
 2020-01-17  Pedro Alves  <palves@redhat.com>
 
 	* configure.ac: Generate config.h instead of support-config.h.
diff --git a/gdbsupport/Makefile.am b/gdbsupport/Makefile.am
index 1a001a0..4b8a604 100644
--- a/gdbsupport/Makefile.am
+++ b/gdbsupport/Makefile.am
@@ -24,6 +24,8 @@ AM_CPPFLAGS = -I$(srcdir)/../include -I$(srcdir)/../gdb \
     -I../gnulib/import -I$(srcdir)/../gnulib/import \
     -I.. -I$(srcdir)/.. $(INCINTL) -I../bfd -I$(srcdir)/../bfd
 
+override CXX += $(CXX_DIALECT)
+
 override CC := $(CXX)
 override CFLAGS := $(CXXFLAGS)
 
diff --git a/gdbsupport/Makefile.in b/gdbsupport/Makefile.in
index 5bbab1c..31065af 100644
--- a/gdbsupport/Makefile.in
+++ b/gdbsupport/Makefile.in
@@ -688,6 +688,8 @@ uninstall-am:
 .PRECIOUS: Makefile
 
 
+override CXX += $(CXX_DIALECT)
+
 override CC := $(CXX)
 override CFLAGS := $(CXXFLAGS)