Add has_cflags, has_xxx for target

[waruqi]

has_cfuncs/has_cxxfuncs for target

We can check c/c++ functions in target from packages

add_requires("zlib")
target("test")
    set_kind("binary")
    add_files("src/*.c")
    add_packages("zlib")
    on_config(function (target)
        if target:has_cfuncs("inflate", {includes = "zlib.h"}) then
            target:add("defines", "HAVE_INFLATE")
        end
    end)

has_cincludes/has_cxxincludes for target

We can check c/c++ includes in target from packages

add_requires("zlib")
target("test")
    set_kind("binary")
    add_files("src/*.c")
    add_packages("zlib")
    on_config(function (target)
        if target:has_cincludes("zlib.h") then
            target:add("defines", "HAVE_ZLIB_H")
        end
    end)

has_ctypes/has_cxxtypes for target

We can check c/c++ types in target from packages

add_requires("zlib")
target("test")
    set_kind("binary")
    add_files("src/*.c")
    add_packages("zlib")
    on_config(function (target)
        if target:has_ctypes("z_stream", {includes = "zlib.h"}) then
            target:add("defines", "HAVE_ZSTEAM_T")
        end
    end)

has_csnippets/has_cxxsnippets for target

We can check c/c++ snippets in target from packages

add_requires("libtins")
target("test")
    set_kind("binary")
    add_files("src/*.cpp")
    add_packages("libtins")
    on_config(function (target)
        local has_snippet = target:check_cxxsnippets({test = [[
            #include <string>
            using namespace Tins;
            void test() {
                std::string name = NetworkInterface::default_interface().name();
                printf("%s\n", name.c_str());
            }
        ]]}, {configs = {languages = "c++11"}, includes = {"tins/tins.h"}}))
        if has_snippet then
            target:add("defines", "HAS_XXX")
        end
    end)

has_cflags/has_cxxflags for target/package

target("test")
    set_kind("binary")
    add_files("src/*.cpp")
    on_config(function (target)
        if target:has_cxxflags("-fPIC") then
            target:add("defines", "HAS_PIC")
        end
    end)

has_features for target/package

target("test")
    set_kind("binary")
    add_files("src/*.cpp")
    on_config(function (target)
        if target:has_features("c_static_assert") then
            target:add("defines", "HAS_STATIC_ASSERT")
        end
        if target:has_features("cxx_constexpr") then
            target:add("defines", "HAS_CXX_CONSTEXPR")
        end
    end)

Now has_features/has_cflags/has_cxxflags are also available in package. We can use it in on_test/on_install

[waruqi]

xmake update -s github:xmake-io/xmake#hasxxx