uClibc++: Fix three bugs

The first allows usage of several functions in the std namespace, which
broke compilation of gddrescue specifically with uClibc-ng and uClibc++.

The second allows usage of long long with normal C++11, which is part of
the standard. Before, std=gnu++11 needed to be passsed to work around it.

As a result of the second patch, the pedantic patch can safely be removed.

Both patches are upstream backports.

Added -std=c++11 to CFLAGS to guarentee proper inclusion of long long.

Added another patch that fixes a typo with the long long support. Sent to
upstream.

Fixed up license information according to SPDX.

Small cleanups for consistency.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/package/libs/uclibc++/patches/005-istream_helpers-Fix-sscanf-typo.patch b/package/libs/uclibc++/patches/005-istream_helpers-Fix-sscanf-typo.patch
new file mode 100644
index 0000000000..66b62c197c
--- /dev/null
+++ b/package/libs/uclibc++/patches/005-istream_helpers-Fix-sscanf-typo.patch
@@ -0,0 +1,37 @@
+From 7f6dd860818512c0eb313320308b22ba7e2c7205 Mon Sep 17 00:00:00 2001
+From: Rosen Penev <rosenp@gmail.com>
+Date: Fri, 4 Oct 2019 20:06:53 -0700
+Subject: [PATCH] istream_helpers: Fix sscanf typo
+
+This caused readin not to work properly with long long types.
+
+Found accidentally through a glibc warning
+(declared with warn_unused_result).
+
+Tested with gptfdisk on OpenWrt.
+
+Signed-off-by: Rosen Penev <rosenp@gmail.com>
+---
+ include/istream_helpers | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/include/istream_helpers
++++ b/include/istream_helpers
+@@ -317,7 +317,7 @@ namespace std{
+ 					sscanf(temp.c_str(), "%llo", (unsigned long long *)&var );
+ 				}else if(stream.flags() & ios_base::hex){
+ 					if(stream.flags() & ios_base::uppercase){
+-						scanf(temp.c_str(), "%llX", (unsigned long long *)&var );
++						sscanf(temp.c_str(), "%llX", (unsigned long long *)&var );
+ 					}else{
+ 						sscanf(temp.c_str(), "%llx", (unsigned long long *)&var);
+ 					}
+@@ -344,7 +344,7 @@ namespace std{
+ 					sscanf(temp.c_str(), "%llo", &var );
+ 				}else if(stream.flags() & ios_base::hex){
+ 					if(stream.flags() & ios_base::uppercase){
+-						scanf(temp.c_str(), "%llX", &var );
++						sscanf(temp.c_str(), "%llX", &var );
+ 					}else{
+ 						sscanf(temp.c_str(), "%llx", &var);
+ 					}