Can anyone tell me how to make this? My gcc version is 7.4.0

[silveric10]

I use ubuntu 18.04 and gcc version is 7.4. I can build folly successfully. But when I make thrift, those errors will occur.
Scanning dependencies of target thrift-core
[ 40%] Building CXX object thrift/lib/cpp/CMakeFiles/thrift-core.dir/Thrift.cpp.o
In file included from /usr/local/include/folly/Range.h:22:0,
from /home/yy/openr/build/deps/fbthrift/thrift/lib/cpp/Thrift.h:20,
from /home/yy/openr/build/deps/fbthrift/thrift/lib/cpp/Thrift.cpp:21:
/usr/local/include/folly/Portability.h:22:1: error: static assertion failed: __cplusplus >= 201402L
static_assert(__cplusplus >= 201402L, "__cplusplus >= 201402L");
^~~~~~~~~~~~~
In file included from /home/yy/openr/build/deps/fbthrift/thrift/lib/cpp/Thrift.h:20:0,
from /home/yy/openr/build/deps/fbthrift/thrift/lib/cpp/Thrift.cpp:21:
/usr/local/include/folly/Range.h:522:12: error: ‘std::enable_if_t’ has not been declared
std::enable_if_t<
^~~~~~~~~~~
/usr/local/include/folly/Range.h:522:23: error: expected ‘>’ before ‘<’ token
std::enable_if_t<
^
/usr/local/include/folly/Range.h:532:12: error: ‘std::enable_if_t’ has not been declared
std::enable_if_t<
^~~~~~~~~~~
/usr/local/include/folly/Range.h:532:23: error: expected ‘>’ before ‘<’ token
std::enable_if_t<

I know that is because I did not use c++14 compiler, but how? I already add added "_compile_options(-std=c++14)" to the CMakeList.txt. My gcc version is 7.4 and it should be c++14 compiler.

[simonmar]

I ran into the same problem. For some reason, cmake has added a -std=gnu++11 flag to some of the generated Makefiles. I haven't been able to find out where it came from - it doesn't seem to be in any pkg-config configs. For now I just manually deleted it, then fbthrift built successfully.