1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198
/// Tells Cargo to enable a `$feature`. /// /// This is equivalent to: /// /// ``` /// println!("cargo:rustc-cfg=$feature"); /// ``` /// /// # Examples /// /// Useful for conditionally enabling certain code to run. /// /// ``` /// # struct Cargo; /// # impl Cargo { /// # fn can_bench(&self) -> bool { true } /// # } /// # let cargo = Cargo; /// if cargo.can_bench() { /// cargo_emit::rustc_cfg!("bench"); /// } /// ``` /// /// Then outside of `build.rs`: /// /// ``` /// #[cfg(bench)] /// mod benches { /// // ... /// } /// ``` #[macro_export] macro_rules! rustc_cfg { ($feature:expr $(, $($args:tt)*)?) => { $crate::pair!("rustc-cfg", $feature $(, $($args)+)?); }; } /// Tells Cargo to assign `$var` for the environment variable for `$key`. /// /// This is equivalent to: /// /// ``` /// println!("cargo:rustc-env=$var=$value"); /// ``` /// /// # Examples /// /// Useful for injecting environment variables during the build. /// /// The `$var` and `$value` parameters get concatenated into a single formatting /// string. Formatting runtime values can be done by passing subsequent values. /// /// ``` /// let git_rev_hash = // /// # "0000111122223333444455556666777788889999"; /// cargo_emit::rustc_env!("MY_HASH", "{}", git_rev_hash); /// ``` #[macro_export] macro_rules! rustc_env { ($var:expr, $value:expr $(, $($args:tt)*)?) => { $crate::pair!("rustc-env", concat!($var, "=", $value) $(, $($args)+)?); }; } /// Tells Cargo to pass `$flags` to the compiler. /// /// As of this writing, only `-l` and `-L` flags are supported. /// /// This is equivalent to: /// /// ``` /// println!("cargo:rustc-flags=$flags"); /// ``` /// /// # Examples /// /// The `$flags` get concatenated into a single formatting /// string. Formatting runtime values can be done by passing subsequent values. /// /// ``` /// let git_rev_hash = // /// # "0000111122223333444455556666777788889999"; /// cargo_emit::rustc_env!("MY_HASH", "{}", git_rev_hash); /// ``` #[macro_export] macro_rules! rustc_flags { ($($flags:literal),+ $(,)?) => { $($crate::pair!("rustc-flags", $flags);)+ }; ($($flags:expr),+ $(,)?) => { $($crate::pair!("rustc-flags", "{}", $flags);)+ }; } /// Tells Cargo to pass `-C link-arg=$flag` to the compiler. /// /// This is equivalent to: /// /// ``` /// println!("cargo:rustc-cdylib-link-arg=$flag"); /// ``` /// /// # Examples /// /// Runtime arguments can be passed directly. /// /// ``` /// let flag1 = // ... /// # ""; /// let flag2 = // ... /// # ""; /// cargo_emit::rustc_cdylib_link_arg!(flag1, flag2); /// ``` #[macro_export] macro_rules! rustc_cdylib_link_arg { ($($flag:literal),+ $(,)?) => { $($crate::pair!("rustc-cdylib-link-arg", $flag);)+ }; ($($flag:expr),+ $(,)?) => { $($crate::pair!("rustc-cdylib-link-arg", "{}", $flag);)+ }; } /// Tells Cargo to pass `$lib` to the compiler as a `-l` flag. /// /// This is equivalent to: /// /// ``` /// println!("cargo:rustc-link-lib=[$kind=]$name"); /// ``` /// /// # Examples /// /// Useful for telling the linker what libraries should be linked. /// /// ``` /// cargo_emit::rustc_link_lib! { /// "ssl", // same as `=> "dylib"` /// "ruby" => "static", /// "CoreFoundation" => "framework", /// } /// ``` #[macro_export] macro_rules! rustc_link_lib { ($name:literal $(,)?) => { $crate::pair!("rustc-link-lib", $name); }; ($name:expr $(,)?) => { $crate::pair!("rustc-link-lib", "{}", $name); }; ($name:literal => $kind:literal $(,)?) => { $crate::pair!("rustc-link-lib", concat!($kind, "=", $name)); }; ($name:expr => $kind:expr $(,)?) => { $crate::pair!("rustc-link-lib", "{}={}", $kind, $name); }; ($($name:expr $(=> $kind:expr)?),+ $(,)?) => { { $($crate::rustc_link_lib!($name $(=> $kind)?);)+ } }; } /// Tells Cargo to pass `$path` to the compiler as a `-L` flag. /// /// This is equivalent to: /// /// ``` /// println!("cargo:rustc-link-search=[$kind=]$path"); /// ``` /// /// # Examples /// /// Useful for telling the linker where a library can be found. /// /// ``` /// cargo_emit::rustc_link_search!( /// "path/to/ssl/lib/", // same as `=> "all"` /// "path/to/ruby/lib/" => "native", /// ); /// ``` #[macro_export] macro_rules! rustc_link_search { ($path:literal $(,)?) => { $crate::pair!("rustc-link-search", $path); }; ($path:expr $(,)?) => { $crate::pair!("rustc-link-search", "{}", $path); }; ($path:literal => $kind:literal $(,)?) => { $crate::pair!("rustc-link-search", concat!($kind, "=", $path)); }; ($path:expr => $kind:expr $(,)?) => { $crate::pair!("rustc-link-search", "{}={}", $kind, $path); }; ($($path:expr $(=> $kind:expr)?),+ $(,)?) => { { $($crate::rustc_link_lib!($path $(=> $kind)?);)+ } }; }