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%% For cross building using erlang:system_info() does not work as rebar runs
%% using the build hosts Erlang runtime.
%% If CXX envrionment variable is defined we are most likely running in a cross environment.
{CXX,Target,Sysroot} = case os:getenv("CXX") of
false -> {"g++",erlang:system_info(system_architecture),""};
Compiler -> {Compiler,string:strip(os:cmd(Compiler ++ " -dumpmachine"), right, $\n),string:strip(os:cmd(Compiler ++ " -print-sysroot"), right, $\n)}
end,
%% Commonly on Linux, compilers report the target triplet as <arch>-<vendor>-linux,
%% however, Erlang runtime reports and expects it as <arch>-<vendor>-linux-gnu.
%% Fix by appending "-gnu".
Mach = case string:str(Target,"linux") of
0 -> Target;
_ -> case string:words(Target,$-) of
4 -> Target;
_ -> Target ++ "-gnu"
end
end,
Vsn = string:strip(os:cmd("git describe --always --tags --abbrev=0 | sed 's/^v//'"), right, $\n),
%% Check for Linux capability API (Install package: libcap-devel).
{LinCXX, LinLD} =
case file:read_file_info(Sysroot ++ "/usr/include/sys/capability.h") of
{ok, _} ->
%io:put_chars("INFO: Detected support of linux capabilities.\n"),
{" -DHAVE_CAP", " -lcap"};
_ ->
{"", ""}
end,
X64 = case Mach of
"x86_64" ++ _E -> " -m64";
_ -> ""
end,
% Replace configuration options read from rebar.config with those dynamically set below
lists:keymerge(1,
lists:keysort(1, [
{port_env, [{"solaris", "CXXFLAGS", "$CXXFLAGS -DHAVE_SETREUID -DHAVE_PTRACE" ++ X64},
{"solaris", "LDFLAGS", "$LDFLAGS -lrt" ++ X64},
{"darwin", "CXXFLAGS", "$CXXFLAGS -DHAVE_SETREUID -DHAVE_PTRACE" ++ X64},
{"darwin", "LDFLAGS", "$LDFLAGS" ++ X64},
{"linux", "CXXFLAGS", "$CXXFLAGS -DHAVE_SETRESUID -DHAVE_PTRACE" ++ LinCXX},
{"linux", "LDFLAGS", "$LDFLAGS" ++ LinLD},
{"CC", CXX},
{"CXX", CXX},
{"CXXFLAGS", "$CXXFLAGS -O0"}
]},
{port_specs,[{filename:join(["priv", Mach, "exec-port"]), ["c_src/*.cpp"]}]},
{edoc_opts, [{overview, "src/overview.edoc"},
{title, "The exec application"},
{includes, ["include"]},
{def, {vsn, Vsn}},
{stylesheet_file, "src/edoc.css"},
{app_default, "http://www.erlang.org/doc/man"}]}
]),
lists:keysort(1, CONFIG)).
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