Compiling It Successfully on Newer Distributions / g++ Versions #33
Description
Compiling lua-requests on any modern distribution will fail with the following error on any modern Linux distribution:
$ luarocks install lua-requests
...
gcc -O2 -fPIC -I/usr/include/lua5.3 -c src/Parser.cpp -o src/Parser.o -Iinclude -Isrc/bind -Isrc/vendor
In file included from include/xml/Parser.h:33,
from src/Parser.cpp:1:
src/bind/dub/dub.h:298:48: error: ISO C++17 does not allow dynamic exception specifications
298 | lua_Number checknumber(lua_State *L, int narg) throw(dub::TypeException);
| ^~~~~
src/bind/dub/dub.h:299:50: error: ISO C++17 does not allow dynamic exception specifications
299 | lua_Integer checkinteger(lua_State *L, int narg) throw(dub::TypeException);
| ^~~~~
src/bind/dub/dub.h:300:63: error: ISO C++17 does not allow dynamic exception specifications
300 | const char *checklstring(lua_State *L, int narg, size_t *len) throw(dub::TypeException);
| ^~~~~
src/bind/dub/dub.h:301:82: error: ISO C++17 does not allow dynamic exception specifications
301 | void **checkudata(lua_State *L, int ud, const char *tname, bool keep_mt = false) throw(dub::Exception);
| ^~~~~
src/bind/dub/dub.h:304:82: error: ISO C++17 does not allow dynamic exception specifications
304 | void **checksdata(lua_State *L, int ud, const char *tname, bool keep_mt = false) throw(dub::Exception);
| ^~~~~
src/bind/dub/dub.h:307:62: error: ISO C++17 does not allow dynamic exception specifications
307 | void **checksdata_d(lua_State *L, int ud, const char *tname) throw(dub::Exception);
| ^~~~~
src/bind/dub/dub.h:317:56: error: ISO C++17 does not allow dynamic exception specifications
317 | inline const char *checkstring(lua_State *L, int narg) throw(dub::TypeException) {
| ^~~~~
Error: Failed installing dependency: https://luarocks.org/xml-1.1.3-1.src.rock - Build error: Failed compiling object src/Parser.o
The problem is due to a C++ feature that was removed in C++17, which is used by newer versions of gcc. To get around this, you can either:
- install and use an older version of
g++ - pass in flags to tell it to compile using C++14 mode instead
For more on the second option and how to update your .rockspec to do so, refer to this.