build: 1) fixed issue where CMake couldn't find local Boost with system-wide Boost present and 2) added a patch for Boost compilation when GCC version >= 8.3 (+minor warning fix)

README.md

@@ -43,13 +43,17 @@ Recommended OS version: Ubuntu 18.04 LTS.
        sudo apt-get install -y build-essential g++ python-dev autotools-dev libicu-dev libbz2-dev cmake git screen checkinstall zlib1g-dev mesa-common-dev libglu1-mesa-dev
 
 2. Download and build Boost
+(Assuming you have cloned Zano into `zano` folder. If used different location for Zano, edit line 4 correspondingly)
 
        curl -OL https://boostorg.jfrog.io/artifactory/main/release/1.70.0/source/boost_1_70_0.tar.bz2
        echo "430ae8354789de4fd19ee52f3b1f739e1fba576f0aded0897c3c2bc00fb38778  boost_1_70_0.tar.bz2" | shasum -c && tar -xjf boost_1_70_0.tar.bz2
-       cd boost_1_70_0
+       rm boost_1_70_0.tar.bz2 && cd boost_1_70_0
+       patch -p0 < ../zano/utils/boost_1.70_gcc_8.patch || cd ..
        ./bootstrap.sh --with-libraries=system,filesystem,thread,date_time,chrono,regex,serialization,atomic,program_options,locale,timer,log
        ./b2
 
+Make sure that you see "The Boost C++ Libraries were successfully built!" message at the end.
+
 3. Install Qt\
 (*GUI version only, skip this step if you're building server version*)
 

src/serialization/binary_archive.h

@@ -51,7 +51,7 @@ template <>
 struct binary_archive<false> : public binary_archive_base<std::istream, false>
 {
   explicit binary_archive(stream_type &s) : base_type(s) {
-    stream_type::streampos pos = stream_.tellg();
+    stream_type::pos_type pos = stream_.tellg();
     stream_.seekg(0, std::ios_base::end);
     eof_pos_ = stream_.tellg();
     stream_.seekg(pos);

utils/boost_1.70_gcc_8.patch

@@ -0,0 +1,15 @@
+# This patch fixes compilation issue in Boost 1.70-1.71 while it is being compiled by GCC ver >= 8.3
+# -- sowle
+# see also: https://github.com/boostorg/thread/pull/297
+#
+--- boost/thread/pthread/thread_data.hpp.orig   2023-10-10 20:22:30.860192033 +0000
++++ boost/thread/pthread/thread_data.hpp        2023-10-10 18:19:22.460764089 +0000
+@@ -57,7 +57,7 @@
+ #else
+           std::size_t page_size = ::sysconf( _SC_PAGESIZE);
+ #endif
+-#if PTHREAD_STACK_MIN > 0
++#ifdef PTHREAD_STACK_MIN
+           if (size<PTHREAD_STACK_MIN) size=PTHREAD_STACK_MIN;
+ #endif
+           size = ((size+page_size-1)/page_size)*page_size;