From 9ed83a33c0a826cb190f60552d930c38a80ad46c Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Mon, 4 Dec 2017 23:07:39 +0000
Subject: Fix -Wunused warnings in libstdc++ headers

	* config/io/basic_file_stdio.h (__basic_file): Remove name of unused
	parameter.
	* include/bits/boost_concept_check.h: Add pragmas to disable
	-Wunused-local-typedef warnings.
	* include/bits/codecvt.h (codecvt_byname<char16_t, char, mbstate_t>)
	(codecvt_byname<char32_t, char, mbstate_t>): Remove name of unused
	parameter.
	* include/bits/locale_facets_nonio.tcc (time_get::do_get_weekday)
	(time_get::do_get_monthname, time_get::do_get_year): Remove unused
	variables.
	* include/std/bitset (_Base_bitset<0>::_M_getword): Remove name of
	unused parameter.
	* include/std/streambuf (_IsUnused): Define.
	(basic_streambuf::imbue, basic_streambuf::pbackfail)
	(basic_streambuf::overflow): Add macro to unused parameters.
	* testsuite/24_iterators/operations/prev_neg.cc: Adjust dg-error.

From-SVN: r255391
---
 libstdc++-v3/include/std/streambuf | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

(limited to 'libstdc++-v3/include/std/streambuf')

diff --git a/libstdc++-v3/include/std/streambuf b/libstdc++-v3/include/std/streambuf
index c1fd395..34fa9a4 100644
--- a/libstdc++-v3/include/std/streambuf
+++ b/libstdc++-v3/include/std/streambuf
@@ -46,6 +46,8 @@ namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
+#define _IsUnused __attribute__ ((__unused__))
+
   template<typename _CharT, typename _Traits>
     streamsize
     __copy_streambufs_eof(basic_streambuf<_CharT, _Traits>*,
@@ -578,7 +580,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  @note  Base class version does nothing.
       */
       virtual void
-      imbue(const locale& __loc)
+      imbue(const locale& __loc _IsUnused)
       { }
 
       // [27.5.2.4.2] buffer management and positioning
@@ -726,7 +728,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  @note  Base class version does nothing, returns eof().
       */
       virtual int_type
-      pbackfail(int_type __c  = traits_type::eof())
+      pbackfail(int_type __c _IsUnused  = traits_type::eof())
       { return traits_type::eof(); }
 
       // Put area:
@@ -770,7 +772,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  @note  Base class version does nothing, returns eof().
       */
       virtual int_type
-      overflow(int_type __c  = traits_type::eof())
+      overflow(int_type __c _IsUnused  = traits_type::eof())
       { return traits_type::eof(); }
 
 #if _GLIBCXX_USE_DEPRECATED && __cplusplus <= 201402L
@@ -852,6 +854,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 			  basic_streambuf<wchar_t>* __sbout, bool& __ineof);
 #endif
 
+#undef _IsUnused
+
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
 
-- 
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