cmake errors 8.0.7 when enabling legacy connector (no replies)

I am trying to build from source and encounter errors from cmake when enabling the legacy connector (-DWITH_JDBC=ON).

I run this cmake command:

cmake3 -DWITH_BOOST:FILEPATH=/data/cmNFS2/scm/share/v1/thirdparty/boost/1.66.0/devtoolset-7 -DCMAKE_INSTALL_PREFIX=/data/cmNFS2/scm/share/v1/thirdparty/mysqlcppconn/8.0.7-rc/devtoolset-7 -DMYSQL_CONFIG_EXECUTABLE:FILEPATH=/data/cmNFS2/scm/share/v1/thirdparty/mysqlclient/6.1.11/devtoolset-7/bin/mysql_config -DMYSQL_LIB=/data/cmNFS2/scm/share/v1/thirdparty/mysqlclient/6.1.11/devtoolset-7/lib/libmysqlclient.so -DWITH_SSL=system -DWITH_JDBC=ON .


Here is a sampling of the error output, though many files fail to compile, but they all relate to this same error:

4 Run Build Command:"/opt/rh/devtoolset-7/root/usr/bin/gmake" "cmTC_0e8ab/fast"
5 /opt/rh/devtoolset-7/root/usr/bin/gmake -f CMakeFiles/cmTC_0e8ab.dir/build.make CMakeFiles/cmTC_0e8ab.dir/build
6 gmake[1]: Entering directory '/data/cmNFS2/scm/share/v1/thirdparty/mysqlcppconn/8.0.7-rc/archive/mysql-connector-c++-8.0.7-rc-src/CMakeFiles/CMakeTmp'
7 Building CXX object CMakeFiles/cmTC_0e8ab.dir/src.cxx.o
8 /opt/rh/devtoolset-7/root/usr/bin/c++ -std=c++11 -std=c++11 -DHAVE_IS_SAME -std=c++11 -fPIE -o CMakeFiles/cmTC_0e8ab.dir/src.cxx.o -c /data/cmNFS2/scm/share/v1/thirdparty/mysqlcppconn/8.0.7-rc/archive/my
9 /data/cmNFS2/scm/share/v1/thirdparty/mysqlcppconn/8.0.7-rc/archive/mysql-connector-c++-8.0.7-rc-src/CMakeFiles/CMakeTmp/src.cxx:1:11: error: ‘::main’ must return ‘int’
10 void main() { return is_same<bool,char>::value; }
11 ^
12 /data/cmNFS2/scm/share/v1/thirdparty/mysqlcppconn/8.0.7-rc/archive/mysql-connector-c++-8.0.7-rc-src/CMakeFiles/CMakeTmp/src.cxx: In function ‘int main()’:
13 /data/cmNFS2/scm/share/v1/thirdparty/mysqlcppconn/8.0.7-rc/archive/mysql-connector-c++-8.0.7-rc-src/CMakeFiles/CMakeTmp/src.cxx:1:22: error: ‘is_same’ was not declared in this scope
14 void main() { return is_same<bool,char>::value; }
15 ^~~~~~~
16 /data/cmNFS2/scm/share/v1/thirdparty/mysqlcppconn/8.0.7-rc/archive/mysql-connector-c++-8.0.7-rc-src/CMakeFiles/CMakeTmp/src.cxx:1:30: error: expected primary-expression before ‘bool’
17 void main() { return is_same<bool,char>::value; }
18 ^~~~
19 /data/cmNFS2/scm/share/v1/thirdparty/mysqlcppconn/8.0.7-rc/archive/mysql-connector-c++-8.0.7-rc-src/CMakeFiles/CMakeTmp/src.cxx:1:30: error: expected ‘;’ before ‘bool’
20 /data/cmNFS2/scm/share/v1/thirdparty/mysqlcppconn/8.0.7-rc/archive/mysql-connector-c++-8.0.7-rc-src/CMakeFiles/CMakeTmp/src.cxx:1:34: error: expected unqualified-id before ‘,’ token
21 void main() { return is_same<bool,char>::value; }
22 ^
23 /data/cmNFS2/scm/share/v1/thirdparty/mysqlcppconn/8.0.7-rc/archive/mysql-connector-c++-8.0.7-rc-src/CMakeFiles/CMakeTmp/src.cxx:1:35: error: expected unqualified-id before ‘char’
24 void main() { return is_same<bool,char>::value; }
25 ^~~~
26 gmake[1]: *** [CMakeFiles/cmTC_0e8ab.dir/build.make:66: CMakeFiles/cmTC_0e8ab.dir/src.cxx.o] Error 1
27 gmake[1]: Leaving directory '/data/cmNFS2/scm/share/v1/thirdparty/mysqlcppconn/8.0.7-rc/archive/mysql-connector-c++-8.0.7-rc-src/CMakeFiles/CMakeTmp'
28 gmake: *** [Makefile:126: cmTC_0e8ab/fast] Error 2
29
30 Source file was:
31 void main() { return is_same<bool,char>::value; }
32 Determining if the include file sys/endian.h exists failed with the following output:
33 Change Dir: /data/cmNFS2/scm/share/v1/thirdparty/mysqlcppconn/8.0.7-rc/archive/mysql-connector-c++-8.0.7-rc-src/CMakeFiles/CMakeTmp

Note, I had to fix a bug in jdbc.cmake, line 81, added -DMYSQL_CONFIG_EXECUTABLE=${MYSQL_CONFIG_EXECUTABLE} so that it would properly accept the value from the CLI.

There seems to be another bug as well when it's trying to determine if the compilers for the C driver and the current compiler are the same, it's doing a regex on the mysql_config output, but mysql_config never outputs the compiler used, so this is a bug in the cmake script, but I believe it only emits a warning so I am ignoring it for now.

My question is to the forum, why is the compilation errors happening? Is it because I'm using a non-standard location for my toolchain perhaps? I'm using latest toolchain from redhat devtools-7.

1 Information about the build environment:
2
3 OS information : Linux-3.10.0-327.4.5.el7.x86_64
4 C compiler : GNU 7.3.1
5 C++ compiler : GNU 7.3.1
6 GLIBC version : (GNU libc) 2.17