Merge pull request #1450 from keith-packard/libstdc++-compat

Libstdc++ compat

11 files changed, 838 insertions, 5 deletions

diff --git a/packages/gcc/10.3.0/0023-Remove-use-of-include_next-from-c-headers.patch b/packages/gcc/10.3.0/0023-Remove-use-of-include_next-from-c-headers.patch
new file mode 100644
index 0000000..47584c2
--- /dev/null
+++ b/packages/gcc/10.3.0/0023-Remove-use-of-include_next-from-c-headers.patch
@@ -0,0 +1,307 @@
+From 4cea8f51c23ce7112f21ff4091e7d97272b81664 Mon Sep 17 00:00:00 2001
+From: Keith Packard <keithp@keithp.com>
+Date: Sun, 24 Jan 2021 14:20:33 -0800
+Subject: [PATCH] Remove use of include_next from c++ headers
+
+Using include_next bypasses the default header search path and lets
+files later in the include path take priority over earlier files.
+
+This makes replacing libc impossible as the default libc headers will
+occur after the libstdc++ headers, and so be picked up in place of
+headers inserted at the begining of the search path or appended to the
+end of the search path.
+
+Using include_next is a hack to work-around broken combinations of
+libraries, and is not necessary in a well constructed toolchain.
+
+Signed-off-by: Keith Packard <keithp@keithp.com>
+---
+ libstdc++-v3/include/bits/std_abs.h   | 4 ++--
+ libstdc++-v3/include/c/cassert        | 2 +-
+ libstdc++-v3/include/c/cctype         | 2 +-
+ libstdc++-v3/include/c/cerrno         | 2 +-
+ libstdc++-v3/include/c/cfloat         | 2 +-
+ libstdc++-v3/include/c/climits        | 2 +-
+ libstdc++-v3/include/c/clocale        | 2 +-
+ libstdc++-v3/include/c/cmath          | 2 +-
+ libstdc++-v3/include/c/csetjmp        | 2 +-
+ libstdc++-v3/include/c/csignal        | 2 +-
+ libstdc++-v3/include/c/cstdarg        | 2 +-
+ libstdc++-v3/include/c/cstddef        | 2 +-
+ libstdc++-v3/include/c/cstdio         | 2 +-
+ libstdc++-v3/include/c/cstdlib        | 2 +-
+ libstdc++-v3/include/c/cstring        | 2 +-
+ libstdc++-v3/include/c/ctime          | 2 +-
+ libstdc++-v3/include/c/cuchar         | 2 +-
+ libstdc++-v3/include/c/cwchar         | 2 +-
+ libstdc++-v3/include/c/cwctype        | 2 +-
+ libstdc++-v3/include/c_global/cmath   | 2 +-
+ libstdc++-v3/include/c_global/cstdlib | 2 +-
+ 21 files changed, 22 insertions(+), 22 deletions(-)
+
+diff --git a/libstdc++-v3/include/bits/std_abs.h b/libstdc++-v3/include/bits/std_abs.h
+index ae6bfc1b1ac..249ed53a3ce 100644
+--- a/libstdc++-v3/include/bits/std_abs.h
++++ b/libstdc++-v3/include/bits/std_abs.h
+@@ -35,9 +35,9 @@
+ #include <bits/c++config.h>
+ 
+ #define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+-#include_next <stdlib.h>
++#include <stdlib.h>
+ #ifdef __CORRECT_ISO_CPP_MATH_H_PROTO
+-# include_next <math.h>
++# include <math.h>
+ #endif
+ #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+ 
+diff --git a/libstdc++-v3/include/c/cassert b/libstdc++-v3/include/c/cassert
+index abd8c0538ef..3e1b97f1626 100644
+--- a/libstdc++-v3/include/c/cassert
++++ b/libstdc++-v3/include/c/cassert
+@@ -31,4 +31,4 @@
+ #pragma GCC system_header
+ 
+ #include <bits/c++config.h>
+-#include_next <assert.h>
++#include <assert.h>
+diff --git a/libstdc++-v3/include/c/cctype b/libstdc++-v3/include/c/cctype
+index d53cb3d43f3..3def33f2077 100644
+--- a/libstdc++-v3/include/c/cctype
++++ b/libstdc++-v3/include/c/cctype
+@@ -31,6 +31,6 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <ctype.h>
++#include <ctype.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cerrno b/libstdc++-v3/include/c/cerrno
+index a8d3869efb6..3725137c115 100644
+--- a/libstdc++-v3/include/c/cerrno
++++ b/libstdc++-v3/include/c/cerrno
+@@ -41,7 +41,7 @@
+ #pragma GCC system_header
+ 
+ #include <bits/c++config.h>
+-#include_next <errno.h>
++#include <errno.h>
+ 
+ // Adhere to section 17.4.1.2 clause 5 of ISO 14882:1998
+ #ifndef errno
+diff --git a/libstdc++-v3/include/c/cfloat b/libstdc++-v3/include/c/cfloat
+index 5865d427c20..df821645e4d 100644
+--- a/libstdc++-v3/include/c/cfloat
++++ b/libstdc++-v3/include/c/cfloat
+@@ -32,6 +32,6 @@
+ #pragma GCC system_header
+ 
+ #include <bits/c++config.h>
+-#include_next <float.h>
++#include <float.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/climits b/libstdc++-v3/include/c/climits
+index 849afadeffc..b153fa8c27c 100644
+--- a/libstdc++-v3/include/c/climits
++++ b/libstdc++-v3/include/c/climits
+@@ -32,6 +32,6 @@
+ #pragma GCC system_header
+ 
+ #include <bits/c++config.h>
+-#include_next <limits.h>
++#include <limits.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/clocale b/libstdc++-v3/include/c/clocale
+index fc84745397d..5ebccdf5006 100644
+--- a/libstdc++-v3/include/c/clocale
++++ b/libstdc++-v3/include/c/clocale
+@@ -31,6 +31,6 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <locale.h>
++#include <locale.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cmath b/libstdc++-v3/include/c/cmath
+index 2c51f2f13bc..2fcd09e4ef9 100644
+--- a/libstdc++-v3/include/c/cmath
++++ b/libstdc++-v3/include/c/cmath
+@@ -33,7 +33,7 @@
+ 
+ #include <bits/c++config.h>
+ 
+-#include_next <math.h>
++#include <math.h>
+ 
+ // Get rid of those macros defined in <math.h> in lieu of real functions.
+ #undef abs
+diff --git a/libstdc++-v3/include/c/csetjmp b/libstdc++-v3/include/c/csetjmp
+index db83610d95f..5abafcb160d 100644
+--- a/libstdc++-v3/include/c/csetjmp
++++ b/libstdc++-v3/include/c/csetjmp
+@@ -31,7 +31,7 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <setjmp.h>
++#include <setjmp.h>
+ 
+ // Get rid of those macros defined in <setjmp.h> in lieu of real functions.
+ #undef longjmp
+diff --git a/libstdc++-v3/include/c/csignal b/libstdc++-v3/include/c/csignal
+index 986c5d3daca..77cb7634a69 100644
+--- a/libstdc++-v3/include/c/csignal
++++ b/libstdc++-v3/include/c/csignal
+@@ -31,6 +31,6 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <signal.h>
++#include <signal.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cstdarg b/libstdc++-v3/include/c/cstdarg
+index 6b6e1850753..0dfc60cc6ba 100644
+--- a/libstdc++-v3/include/c/cstdarg
++++ b/libstdc++-v3/include/c/cstdarg
+@@ -32,6 +32,6 @@
+ #pragma GCC system_header
+ 
+ #undef __need___va_list
+-#include_next <stdarg.h>
++#include <stdarg.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cstddef b/libstdc++-v3/include/c/cstddef
+index 7fc8ce34efc..fc90dfb3f18 100644
+--- a/libstdc++-v3/include/c/cstddef
++++ b/libstdc++-v3/include/c/cstddef
+@@ -35,6 +35,6 @@
+ #define __need_ptrdiff_t
+ #define __need_NULL
+ #define __need_offsetof
+-#include_next <stddef.h>
++#include <stddef.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cstdio b/libstdc++-v3/include/c/cstdio
+index e943aa8e725..89bcd2d7391 100644
+--- a/libstdc++-v3/include/c/cstdio
++++ b/libstdc++-v3/include/c/cstdio
+@@ -31,7 +31,7 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <stdio.h>
++#include <stdio.h>
+ 
+ // Get rid of those macros defined in <stdio.h> in lieu of real functions.
+ #undef clearerr
+diff --git a/libstdc++-v3/include/c/cstdlib b/libstdc++-v3/include/c/cstdlib
+index 86d9587482f..a26013286be 100644
+--- a/libstdc++-v3/include/c/cstdlib
++++ b/libstdc++-v3/include/c/cstdlib
+@@ -31,6 +31,6 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <stdlib.h>
++#include <stdlib.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cstring b/libstdc++-v3/include/c/cstring
+index 8b1e89b13b6..ca56c75e753 100644
+--- a/libstdc++-v3/include/c/cstring
++++ b/libstdc++-v3/include/c/cstring
+@@ -31,6 +31,6 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <string.h>
++#include <string.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/ctime b/libstdc++-v3/include/c/ctime
+index 367172b21eb..135da2a25c4 100644
+--- a/libstdc++-v3/include/c/ctime
++++ b/libstdc++-v3/include/c/ctime
+@@ -31,6 +31,6 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <time.h>
++#include <time.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cuchar b/libstdc++-v3/include/c/cuchar
+index e63b55ae12c..c79708fba6a 100644
+--- a/libstdc++-v3/include/c/cuchar
++++ b/libstdc++-v3/include/c/cuchar
+@@ -39,7 +39,7 @@
+ #include <cwchar>
+ 
+ #if _GLIBCXX_USE_C11_UCHAR_CXX11
+-# include_next <uchar.h>
++# include <uchar.h>
+ #endif
+ 
+ #endif // C++11
+diff --git a/libstdc++-v3/include/c/cwchar b/libstdc++-v3/include/c/cwchar
+index 05d4d70c6fc..0fc9a9a394a 100644
+--- a/libstdc++-v3/include/c/cwchar
++++ b/libstdc++-v3/include/c/cwchar
+@@ -36,7 +36,7 @@
+ #include <ctime>
+ 
+ #if _GLIBCXX_HAVE_WCHAR_H
+-#include_next <wchar.h>
++#include <wchar.h>
+ #endif
+ 
+ // Need to do a bit of trickery here with mbstate_t as char_traits
+diff --git a/libstdc++-v3/include/c/cwctype b/libstdc++-v3/include/c/cwctype
+index 0626765d6c8..4839b693e46 100644
+--- a/libstdc++-v3/include/c/cwctype
++++ b/libstdc++-v3/include/c/cwctype
+@@ -34,7 +34,7 @@
+ #include <bits/c++config.h>
+ 
+ #if _GLIBCXX_HAVE_WCTYPE_H
+-#include_next <wctype.h>
++#include <wctype.h>
+ #endif
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c_global/cmath b/libstdc++-v3/include/c_global/cmath
+index 39a6b036b8c..bfb6dcd4c88 100644
+--- a/libstdc++-v3/include/c_global/cmath
++++ b/libstdc++-v3/include/c_global/cmath
+@@ -42,7 +42,7 @@
+ #include <bits/cpp_type_traits.h>
+ #include <ext/type_traits.h>
+ #define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+-#include_next <math.h>
++#include <math.h>
+ #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+ #include <bits/std_abs.h>
+ 
+diff --git a/libstdc++-v3/include/c_global/cstdlib b/libstdc++-v3/include/c_global/cstdlib
+index 47b954cf2fa..996a87b372c 100644
+--- a/libstdc++-v3/include/c_global/cstdlib
++++ b/libstdc++-v3/include/c_global/cstdlib
+@@ -72,7 +72,7 @@ namespace std
+ // Need to ensure this finds the C library's <stdlib.h> not a libstdc++
+ // wrapper that might already be installed later in the include search path.
+ #define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+-#include_next <stdlib.h>
++#include <stdlib.h>
+ #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+ #include <bits/std_abs.h>
+ 
+-- 
+2.30.0
+
diff --git a/packages/gcc/11.1.0/0009-Remove-use-of-include_next-from-c-headers.patch b/packages/gcc/11.1.0/0009-Remove-use-of-include_next-from-c-headers.patch
new file mode 100644
index 0000000..a4e3215
--- /dev/null
+++ b/packages/gcc/11.1.0/0009-Remove-use-of-include_next-from-c-headers.patch
@@ -0,0 +1,307 @@
+From 9db1164d68ee1da7434af48db4f828d7df51b055 Mon Sep 17 00:00:00 2001
+From: Keith Packard <keithp@keithp.com>
+Date: Sun, 24 Jan 2021 14:20:33 -0800
+Subject: [PATCH] Remove use of include_next from c++ headers
+
+Using include_next bypasses the default header search path and lets
+files later in the include path take priority over earlier files.
+
+This makes replacing libc impossible as the default libc headers will
+occur after the libstdc++ headers, and so be picked up in place of
+headers inserted at the begining of the search path or appended to the
+end of the search path.
+
+Using include_next is a hack to work-around broken combinations of
+libraries, and is not necessary in a well constructed toolchain.
+
+Signed-off-by: Keith Packard <keithp@keithp.com>
+---
+ libstdc++-v3/include/bits/std_abs.h   | 4 ++--
+ libstdc++-v3/include/c/cassert        | 2 +-
+ libstdc++-v3/include/c/cctype         | 2 +-
+ libstdc++-v3/include/c/cerrno         | 2 +-
+ libstdc++-v3/include/c/cfloat         | 2 +-
+ libstdc++-v3/include/c/climits        | 2 +-
+ libstdc++-v3/include/c/clocale        | 2 +-
+ libstdc++-v3/include/c/cmath          | 2 +-
+ libstdc++-v3/include/c/csetjmp        | 2 +-
+ libstdc++-v3/include/c/csignal        | 2 +-
+ libstdc++-v3/include/c/cstdarg        | 2 +-
+ libstdc++-v3/include/c/cstddef        | 2 +-
+ libstdc++-v3/include/c/cstdio         | 2 +-
+ libstdc++-v3/include/c/cstdlib        | 2 +-
+ libstdc++-v3/include/c/cstring        | 2 +-
+ libstdc++-v3/include/c/ctime          | 2 +-
+ libstdc++-v3/include/c/cuchar         | 2 +-
+ libstdc++-v3/include/c/cwchar         | 2 +-
+ libstdc++-v3/include/c/cwctype        | 2 +-
+ libstdc++-v3/include/c_global/cmath   | 2 +-
+ libstdc++-v3/include/c_global/cstdlib | 2 +-
+ 21 files changed, 22 insertions(+), 22 deletions(-)
+
+diff --git a/libstdc++-v3/include/bits/std_abs.h b/libstdc++-v3/include/bits/std_abs.h
+index ae6bfc1b1ac..249ed53a3ce 100644
+--- a/libstdc++-v3/include/bits/std_abs.h
++++ b/libstdc++-v3/include/bits/std_abs.h
+@@ -35,9 +35,9 @@
+ #include <bits/c++config.h>
+ 
+ #define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+-#include_next <stdlib.h>
++#include <stdlib.h>
+ #ifdef __CORRECT_ISO_CPP_MATH_H_PROTO
+-# include_next <math.h>
++# include <math.h>
+ #endif
+ #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+ 
+diff --git a/libstdc++-v3/include/c/cassert b/libstdc++-v3/include/c/cassert
+index abd8c0538ef..3e1b97f1626 100644
+--- a/libstdc++-v3/include/c/cassert
++++ b/libstdc++-v3/include/c/cassert
+@@ -31,4 +31,4 @@
+ #pragma GCC system_header
+ 
+ #include <bits/c++config.h>
+-#include_next <assert.h>
++#include <assert.h>
+diff --git a/libstdc++-v3/include/c/cctype b/libstdc++-v3/include/c/cctype
+index d53cb3d43f3..3def33f2077 100644
+--- a/libstdc++-v3/include/c/cctype
++++ b/libstdc++-v3/include/c/cctype
+@@ -31,6 +31,6 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <ctype.h>
++#include <ctype.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cerrno b/libstdc++-v3/include/c/cerrno
+index a8d3869efb6..3725137c115 100644
+--- a/libstdc++-v3/include/c/cerrno
++++ b/libstdc++-v3/include/c/cerrno
+@@ -41,7 +41,7 @@
+ #pragma GCC system_header
+ 
+ #include <bits/c++config.h>
+-#include_next <errno.h>
++#include <errno.h>
+ 
+ // Adhere to section 17.4.1.2 clause 5 of ISO 14882:1998
+ #ifndef errno
+diff --git a/libstdc++-v3/include/c/cfloat b/libstdc++-v3/include/c/cfloat
+index 5865d427c20..df821645e4d 100644
+--- a/libstdc++-v3/include/c/cfloat
++++ b/libstdc++-v3/include/c/cfloat
+@@ -32,6 +32,6 @@
+ #pragma GCC system_header
+ 
+ #include <bits/c++config.h>
+-#include_next <float.h>
++#include <float.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/climits b/libstdc++-v3/include/c/climits
+index 849afadeffc..b153fa8c27c 100644
+--- a/libstdc++-v3/include/c/climits
++++ b/libstdc++-v3/include/c/climits
+@@ -32,6 +32,6 @@
+ #pragma GCC system_header
+ 
+ #include <bits/c++config.h>
+-#include_next <limits.h>
++#include <limits.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/clocale b/libstdc++-v3/include/c/clocale
+index fc84745397d..5ebccdf5006 100644
+--- a/libstdc++-v3/include/c/clocale
++++ b/libstdc++-v3/include/c/clocale
+@@ -31,6 +31,6 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <locale.h>
++#include <locale.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cmath b/libstdc++-v3/include/c/cmath
+index 2c51f2f13bc..2fcd09e4ef9 100644
+--- a/libstdc++-v3/include/c/cmath
++++ b/libstdc++-v3/include/c/cmath
+@@ -33,7 +33,7 @@
+ 
+ #include <bits/c++config.h>
+ 
+-#include_next <math.h>
++#include <math.h>
+ 
+ // Get rid of those macros defined in <math.h> in lieu of real functions.
+ #undef abs
+diff --git a/libstdc++-v3/include/c/csetjmp b/libstdc++-v3/include/c/csetjmp
+index db83610d95f..5abafcb160d 100644
+--- a/libstdc++-v3/include/c/csetjmp
++++ b/libstdc++-v3/include/c/csetjmp
+@@ -31,7 +31,7 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <setjmp.h>
++#include <setjmp.h>
+ 
+ // Get rid of those macros defined in <setjmp.h> in lieu of real functions.
+ #undef longjmp
+diff --git a/libstdc++-v3/include/c/csignal b/libstdc++-v3/include/c/csignal
+index 986c5d3daca..77cb7634a69 100644
+--- a/libstdc++-v3/include/c/csignal
++++ b/libstdc++-v3/include/c/csignal
+@@ -31,6 +31,6 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <signal.h>
++#include <signal.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cstdarg b/libstdc++-v3/include/c/cstdarg
+index 6b6e1850753..0dfc60cc6ba 100644
+--- a/libstdc++-v3/include/c/cstdarg
++++ b/libstdc++-v3/include/c/cstdarg
+@@ -32,6 +32,6 @@
+ #pragma GCC system_header
+ 
+ #undef __need___va_list
+-#include_next <stdarg.h>
++#include <stdarg.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cstddef b/libstdc++-v3/include/c/cstddef
+index 7fc8ce34efc..fc90dfb3f18 100644
+--- a/libstdc++-v3/include/c/cstddef
++++ b/libstdc++-v3/include/c/cstddef
+@@ -35,6 +35,6 @@
+ #define __need_ptrdiff_t
+ #define __need_NULL
+ #define __need_offsetof
+-#include_next <stddef.h>
++#include <stddef.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cstdio b/libstdc++-v3/include/c/cstdio
+index e943aa8e725..89bcd2d7391 100644
+--- a/libstdc++-v3/include/c/cstdio
++++ b/libstdc++-v3/include/c/cstdio
+@@ -31,7 +31,7 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <stdio.h>
++#include <stdio.h>
+ 
+ // Get rid of those macros defined in <stdio.h> in lieu of real functions.
+ #undef clearerr
+diff --git a/libstdc++-v3/include/c/cstdlib b/libstdc++-v3/include/c/cstdlib
+index 86d9587482f..a26013286be 100644
+--- a/libstdc++-v3/include/c/cstdlib
++++ b/libstdc++-v3/include/c/cstdlib
+@@ -31,6 +31,6 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <stdlib.h>
++#include <stdlib.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cstring b/libstdc++-v3/include/c/cstring
+index 8b1e89b13b6..ca56c75e753 100644
+--- a/libstdc++-v3/include/c/cstring
++++ b/libstdc++-v3/include/c/cstring
+@@ -31,6 +31,6 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <string.h>
++#include <string.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/ctime b/libstdc++-v3/include/c/ctime
+index 367172b21eb..135da2a25c4 100644
+--- a/libstdc++-v3/include/c/ctime
++++ b/libstdc++-v3/include/c/ctime
+@@ -31,6 +31,6 @@
+ 
+ #pragma GCC system_header
+ 
+-#include_next <time.h>
++#include <time.h>
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c/cuchar b/libstdc++-v3/include/c/cuchar
+index e63b55ae12c..c79708fba6a 100644
+--- a/libstdc++-v3/include/c/cuchar
++++ b/libstdc++-v3/include/c/cuchar
+@@ -39,7 +39,7 @@
+ #include <cwchar>
+ 
+ #if _GLIBCXX_USE_C11_UCHAR_CXX11
+-# include_next <uchar.h>
++# include <uchar.h>
+ #endif
+ 
+ #endif // C++11
+diff --git a/libstdc++-v3/include/c/cwchar b/libstdc++-v3/include/c/cwchar
+index 05d4d70c6fc..0fc9a9a394a 100644
+--- a/libstdc++-v3/include/c/cwchar
++++ b/libstdc++-v3/include/c/cwchar
+@@ -36,7 +36,7 @@
+ #include <ctime>
+ 
+ #if _GLIBCXX_HAVE_WCHAR_H
+-#include_next <wchar.h>
++#include <wchar.h>
+ #endif
+ 
+ // Need to do a bit of trickery here with mbstate_t as char_traits
+diff --git a/libstdc++-v3/include/c/cwctype b/libstdc++-v3/include/c/cwctype
+index 0626765d6c8..4839b693e46 100644
+--- a/libstdc++-v3/include/c/cwctype
++++ b/libstdc++-v3/include/c/cwctype
+@@ -34,7 +34,7 @@
+ #include <bits/c++config.h>
+ 
+ #if _GLIBCXX_HAVE_WCTYPE_H
+-#include_next <wctype.h>
++#include <wctype.h>
+ #endif
+ 
+ #endif
+diff --git a/libstdc++-v3/include/c_global/cmath b/libstdc++-v3/include/c_global/cmath
+index 39a6b036b8c..bfb6dcd4c88 100644
+--- a/libstdc++-v3/include/c_global/cmath
++++ b/libstdc++-v3/include/c_global/cmath
+@@ -42,7 +42,7 @@
+ #include <bits/cpp_type_traits.h>
+ #include <ext/type_traits.h>
+ #define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+-#include_next <math.h>
++#include <math.h>
+ #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+ #include <bits/std_abs.h>
+ 
+diff --git a/libstdc++-v3/include/c_global/cstdlib b/libstdc++-v3/include/c_global/cstdlib
+index 47b954cf2fa..996a87b372c 100644
+--- a/libstdc++-v3/include/c_global/cstdlib
++++ b/libstdc++-v3/include/c_global/cstdlib
+@@ -72,7 +72,7 @@ namespace std
+ // Need to ensure this finds the C library's <stdlib.h> not a libstdc++
+ // wrapper that might already be installed later in the include search path.
+ #define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+-#include_next <stdlib.h>
++#include <stdlib.h>
+ #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+ #include <bits/std_abs.h>
+ 
+-- 
+2.31.1
+
diff --git a/packages/picolibc/1.5.1/0001-libc-Remove-include-sys-select.h-from-sys-types.h.patch b/packages/picolibc/1.5.1/0001-libc-Remove-include-sys-select.h-from-sys-types.h.patch
new file mode 100644
index 0000000..5536cd4
--- /dev/null
+++ b/packages/picolibc/1.5.1/0001-libc-Remove-include-sys-select.h-from-sys-types.h.patch
@@ -0,0 +1,30 @@
+From 9d0640874425e9f3f265c9baff7a47139b25ea7d Mon Sep 17 00:00:00 2001
+From: Keith Packard <keithp@keithp.com>
+Date: Thu, 14 Jan 2021 17:54:22 -0800
+Subject: [PATCH 1/2] libc: Remove #include <sys/select.h> from sys/types.h
+
+picolibc's sys/select.h is likely to be replaced by the underlying
+operating system version (as it is on Zephyr). Don't include it from
+sys/types.h as that version may depend on other definitions in
+sys/types.h which haven't yet been defined.
+
+Signed-off-by: Keith Packard <keithp@keithp.com>
+---
+ newlib/libc/include/sys/types.h | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/newlib/libc/include/sys/types.h b/newlib/libc/include/sys/types.h
+index ea25222c2..1a0abcb83 100644
+--- a/newlib/libc/include/sys/types.h
++++ b/newlib/libc/include/sys/types.h
+@@ -75,7 +75,6 @@ typedef __intptr_t register_t;
+ 
+ #if __BSD_VISIBLE
+ #include <machine/endian.h>
+-#include <sys/select.h>
+ #  define	physadr		physadr_t
+ #  define	quad		quad_t
+ 
+-- 
+2.30.0
+
diff --git a/packages/picolibc/1.5.1/0002-tinystdio-Fix-snprintf-buf-0-.-to-not-smash-buffer.patch b/packages/picolibc/1.5.1/0002-tinystdio-Fix-snprintf-buf-0-.-to-not-smash-buffer.patch
new file mode 100644
index 0000000..754957e
--- /dev/null
+++ b/packages/picolibc/1.5.1/0002-tinystdio-Fix-snprintf-buf-0-.-to-not-smash-buffer.patch
@@ -0,0 +1,77 @@
+From 9df2d784439720abbf67fa96c6515a5c4a9f230a Mon Sep 17 00:00:00 2001
+From: Keith Packard <keithp@keithp.com>
+Date: Thu, 14 Jan 2021 18:48:44 -0800
+Subject: [PATCH 2/2] tinystdio: Fix snprintf(buf, 0, ...) to not smash buffer
+
+snprintf(buf, 0) should not write anything to the destination, not
+even a trailing '\0'. The tinystdio implementation had a signed
+comparison bug where this case would cause a null to be placed in the
+output buffer at the size of the data that would have been written.
+
+Add a test to make sure snprintf respects the 'len' parameter
+correctly.
+
+Signed-off-by: Keith Packard <keithp@keithp.com>
+---
+ newlib/libc/tinystdio/snprintf.c |  2 +-
+ test/printf_scanf.c              | 31 +++++++++++++++++++++++++++++++
+ 2 files changed, 32 insertions(+), 1 deletion(-)
+
+diff --git a/newlib/libc/tinystdio/snprintf.c b/newlib/libc/tinystdio/snprintf.c
+index 52d2f84d3..1052c9338 100644
+--- a/newlib/libc/tinystdio/snprintf.c
++++ b/newlib/libc/tinystdio/snprintf.c
+@@ -56,7 +56,7 @@ snprintf(char *s, size_t n, const char *fmt, ...)
+ 	i = vfprintf(&f.file, fmt, ap);
+ 	va_end(ap);
+ 
+-	if (n >= 0 && i >= 0)
++	if ((int) n >= 0 && i >= 0)
+ 		s[i < n ? i : n] = 0;
+ 
+ 	return i;
+diff --git a/test/printf_scanf.c b/test/printf_scanf.c
+index 2bc83e1d0..f89f46e4f 100644
+--- a/test/printf_scanf.c
++++ b/test/printf_scanf.c
+@@ -96,6 +96,37 @@ main(int argc, char **argv)
+ 		fflush(stdout);
+ 	}
+ #endif
++
++	/*
++	 * test snprintf to make sure it doesn't overwrite the specified buffer
++	 * length (even if that is zero)
++	 */
++	for (x = 0; x <= 6; x++) {
++		char tbuf[10] = "xxxxxxxxx";
++		const char ref[10] = "xxxxxxxxx";
++		int i = snprintf(tbuf, x, "%s", "123");
++		int y = x <= 4 ? x : 4;
++		if (i != 3) {
++			printf("snprintf(tbuf, %d, \"%%s\", \"123\") return %d instead of %d\n",
++			       x, i, 3);
++			errors++;
++		}
++		int l = strlen(tbuf);
++		if (y > 0 && l != y - 1) {
++			printf("returned buffer len want %d got %d\n", y - 1, l);
++			errors++;
++		}
++		if (y > 0 && strncmp(tbuf, "123", y - 1) != 0) {
++			strncpy(buf, "123", y - 1);
++			buf[y-1] = '\0';
++			printf("returned buffer want %s got %s\n", buf, tbuf);
++			errors++;
++		}
++		if (memcmp(tbuf + y, ref + y, sizeof(tbuf) - y) != 0) {
++			printf("tail of buf mangled %s\n", tbuf + y);
++			errors++;
++		}
++	}
+ 	for (x = 0; x < 32; x++) {
+ 		unsigned int v = 0x12345678 >> x;
+ 		unsigned int r;
+-- 
+2.30.0
+
diff --git a/packages/picolibc/1.5.1/0003-libc-Expose-wchar-stdio-prototypes-even-for-TINY_STD.patch b/packages/picolibc/1.5.1/0003-libc-Expose-wchar-stdio-prototypes-even-for-TINY_STD.patch
new file mode 100644
index 0000000..5e1c5a8
--- /dev/null
+++ b/packages/picolibc/1.5.1/0003-libc-Expose-wchar-stdio-prototypes-even-for-TINY_STD.patch
@@ -0,0 +1,108 @@
+From f0c62653bbcf68291a7dd621db367a9fef666183 Mon Sep 17 00:00:00 2001
+From: Keith Packard <keithp@keithp.com>
+Date: Sun, 24 Jan 2021 15:27:14 -0800
+Subject: [PATCH 3/3] libc: Expose wchar stdio prototypes even for TINY_STDIO
+
+This makes libstdc++ happy when wrapping these names, even though they
+aren't actually available for appplications.
+
+Signed-off-by: Keith Packard <keithp@keithp.com>
+---
+ newlib/libc/include/wchar.h | 39 +++++++++++++++++++------------------
+ 1 file changed, 20 insertions(+), 19 deletions(-)
+
+diff --git a/newlib/libc/include/wchar.h b/newlib/libc/include/wchar.h
+index 8a9c4b0fe..5dc3af93c 100644
+--- a/newlib/libc/include/wchar.h
++++ b/newlib/libc/include/wchar.h
+@@ -217,8 +217,6 @@ float wcstof_l (const wchar_t *, wchar_t **, locale_t);
+ long double wcstold_l (const wchar_t *, wchar_t **, locale_t);
+ #endif
+ 
+-#ifndef TINY_STDIO
+-
+ wint_t fgetwc (__FILE *);
+ wchar_t *fgetws (wchar_t *__restrict, int, __FILE *__restrict);
+ wint_t fputwc (wchar_t, __FILE *);
+@@ -232,6 +230,8 @@ wint_t putwc (wchar_t, __FILE *);
+ wint_t putwchar (wchar_t);
+ wint_t ungetwc (wint_t wc, __FILE *);
+ 
++#ifndef TINY_STDIO
++
+ struct _reent;
+ 
+ wint_t _fgetwc_r (struct _reent *, __FILE *);
+@@ -253,6 +253,24 @@ wint_t _putwchar_r (struct _reent *, wchar_t);
+ wint_t _putwchar_unlocked_r (struct _reent *, wchar_t);
+ wint_t _ungetwc_r (struct _reent *, wint_t wc, __FILE *);
+ 
++int	_fwprintf_r (struct _reent *, __FILE *, const wchar_t *, ...);
++int	_swprintf_r (struct _reent *, wchar_t *, size_t, const wchar_t *, ...);
++int	_vfwprintf_r (struct _reent *, __FILE *, const wchar_t *, va_list);
++int	_vswprintf_r (struct _reent *, wchar_t *, size_t, const wchar_t *, va_list);
++int	_vwprintf_r (struct _reent *, const wchar_t *, va_list);
++int	_wprintf_r (struct _reent *, const wchar_t *, ...);
++
++int	_fwscanf_r (struct _reent *, __FILE *, const wchar_t *, ...);
++int	_swscanf_r (struct _reent *, const wchar_t *, const wchar_t *, ...);
++int	_vfwscanf_r (struct _reent *, __FILE *, const wchar_t *, va_list);
++int	_vswscanf_r (struct _reent *, const wchar_t *, const wchar_t *, va_list);
++int	_vwscanf_r (struct _reent *, const wchar_t *, va_list);
++int	_wscanf_r (struct _reent *, const wchar_t *, ...);
++
++__FILE *_open_wmemstream_r (struct _reent *, wchar_t **, size_t *);
++
++#endif
++
+ #if __GNU_VISIBLE
+ wint_t fgetwc_unlocked (__FILE *);
+ wchar_t *fgetws_unlocked (wchar_t *__restrict, int, __FILE *__restrict);
+@@ -267,7 +285,6 @@ wint_t putwchar_unlocked (wchar_t);
+ #if __POSIX_VISIBLE >= 200809
+ __FILE *open_wmemstream (wchar_t **, size_t *);
+ #endif
+-__FILE *_open_wmemstream_r (struct _reent *, wchar_t **, size_t *);
+ 
+ #if __ISO_C_VISIBLE >= 1999 || __XSI_VISIBLE >= 500
+ int	fwprintf (__FILE *__restrict, const wchar_t *__restrict, ...);
+@@ -281,13 +298,6 @@ int	vwprintf (const wchar_t *__restrict, va_list);
+ int	wprintf (const wchar_t *__restrict, ...);
+ #endif
+ 
+-int	_fwprintf_r (struct _reent *, __FILE *, const wchar_t *, ...);
+-int	_swprintf_r (struct _reent *, wchar_t *, size_t, const wchar_t *, ...);
+-int	_vfwprintf_r (struct _reent *, __FILE *, const wchar_t *, va_list);
+-int	_vswprintf_r (struct _reent *, wchar_t *, size_t, const wchar_t *, va_list);
+-int	_vwprintf_r (struct _reent *, const wchar_t *, va_list);
+-int	_wprintf_r (struct _reent *, const wchar_t *, ...);
+-
+ #if __ISO_C_VISIBLE >= 1999 || __XSI_VISIBLE >= 500
+ int	fwscanf (__FILE *__restrict, const wchar_t *__restrict, ...);
+ int	swscanf (const wchar_t *__restrict,
+@@ -300,13 +310,6 @@ int	vwscanf (const wchar_t *__restrict, va_list);
+ int	wscanf (const wchar_t *__restrict, ...);
+ #endif
+ 
+-int	_fwscanf_r (struct _reent *, __FILE *, const wchar_t *, ...);
+-int	_swscanf_r (struct _reent *, const wchar_t *, const wchar_t *, ...);
+-int	_vfwscanf_r (struct _reent *, __FILE *, const wchar_t *, va_list);
+-int	_vswscanf_r (struct _reent *, const wchar_t *, const wchar_t *, va_list);
+-int	_vwscanf_r (struct _reent *, const wchar_t *, va_list);
+-int	_wscanf_r (struct _reent *, const wchar_t *, ...);
+-
+ #define getwc(fp)	fgetwc(fp)
+ #define putwc(wc,fp)	fputwc((wc), (fp))
+ #define getwchar()	fgetwc(stdin)
+@@ -319,8 +322,6 @@ int	_wscanf_r (struct _reent *, const wchar_t *, ...);
+ #define putwchar_unlocked(wc)	fputwc_unlocked((wc), stdout)
+ #endif
+ 
+-#endif /* !TINY_STDIO */
+-
+ _END_STD_C
+ 
+ #if __SSP_FORTIFY_LEVEL > 0
+-- 
+2.30.0
+
diff --git a/packages/picolibc/1.5.1/chksum b/packages/picolibc/1.5.1/chksum
new file mode 100644
index 0000000..01fb145
--- /dev/null
+++ b/packages/picolibc/1.5.1/chksum
@@ -0,0 +1,4 @@
+md5 picolibc-1.5.1.tar.xz e2221b038181ae0c9f7b0bd3b1353d9e
+sha1 picolibc-1.5.1.tar.xz ad86b3f02fa7fc62563984f2c1a20ee8b4e566b9
+sha256 picolibc-1.5.1.tar.xz 06b34f34af4cef1be16e7d2e6de9f0c3aa9980dd7fd86c8b1b78331efbfa9db6
+sha512 picolibc-1.5.1.tar.xz 882ad8a20ab6dd8816a8b468834c3fcd66dd57f668f9fcb53e92b99c643377e15df2c37e80f6212c82d4ec63320575e0f7158c071edf5d8f66bb58aa4eecfd24
diff --git a/packages/picolibc/1.5/version.desc b/packages/picolibc/1.5.1/version.desc
index e69de29..e69de29 100644
--- a/packages/picolibc/1.5/version.desc
+++ b/packages/picolibc/1.5.1/version.desc
diff --git a/packages/picolibc/1.5/chksum b/packages/picolibc/1.5/chksum
deleted file mode 100644
index c5240fb..0000000
--- a/packages/picolibc/1.5/chksum
+++ /dev/null
@@ -1,4 +0,0 @@
-md5 picolibc-1.5.tar.xz f883ccdb907f13bd79ccecb6b677cc99
-sha1 picolibc-1.5.tar.xz 549b03479feab74042c58ca5903f2a5fd63dca65
-sha256 picolibc-1.5.tar.xz 88bd1b6e050145e285cb61c8cf4ce75714a8eb5d80cf89d0d0edc4f3fa067db1
-sha512 picolibc-1.5.tar.xz 7f50bc4bc7d8dbfb6feba09eee896918f5ac8b57d27c2d8158f17dc7d6778b80798c87edee92cf20d27b1dd2b3d1bfb157cfd9084019fdb7a6173ef959f03a92
diff --git a/packages/picolibc/1.6.2/chksum b/packages/picolibc/1.6.2/chksum
new file mode 100644
index 0000000..34fc8f3
--- /dev/null
+++ b/packages/picolibc/1.6.2/chksum
@@ -0,0 +1,4 @@
+md5 picolibc-1.6.2.tar.xz 12a90c1886fff1b3169e16e005396160
+sha1 picolibc-1.6.2.tar.xz 88e3aae511cbf86a7f095dfe387a0c5618fd697c
+sha256 picolibc-1.6.2.tar.xz d2bd17409f11e7c3bf72c4c244244e70e2086c640e700a7800c7fa3513cd9c4d
+sha512 picolibc-1.6.2.tar.xz 64ca47814c60e873989adc6ec33bfd94877ed78537a858f15f5795b0a5896a80fd900a2d54d6ad3241ef3da56b423181dc56fe4fa105951196ec71d0e0c6ece2
diff --git a/packages/picolibc/1.6.2/version.desc b/packages/picolibc/1.6.2/version.desc
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/packages/picolibc/1.6.2/version.desc
diff --git a/packages/picolibc/package.desc b/packages/picolibc/package.desc
index 00b3ee0..63d89c9 100644
--- a/packages/picolibc/package.desc
+++ b/packages/picolibc/package.desc
@@ -1,6 +1,6 @@
 origin='keithp.com'
 repository='git https://github.com/picolibc/picolibc.git'
-milestones='1.4.7'
+milestones='1.4 1.5 1.6'
 relevantpattern='*.*|.*. *.*|.'
 archive_formats='.tar.xz'
 mirrors='https://github.com/picolibc/picolibc/releases/download/${CT_PICOLIBC_VERSION}'