diff options
Diffstat (limited to 'cc/src/lib.rs')
| -rw-r--r-- | cc/src/lib.rs | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/cc/src/lib.rs b/cc/src/lib.rs index 7672cf4..5eebd07 100644 --- a/cc/src/lib.rs +++ b/cc/src/lib.rs @@ -55,6 +55,7 @@ #![doc(html_root_url = "https://docs.rs/cc/1.0")] #![cfg_attr(test, deny(warnings))] +#![allow(deprecated)] #![deny(missing_docs)] #[cfg(feature = "parallel")] @@ -112,6 +113,7 @@ pub struct Build { archiver: Option<PathBuf>, cargo_metadata: bool, pic: Option<bool>, + use_plt: Option<bool>, static_crt: Option<bool>, shared_flag: Option<bool>, static_flag: Option<bool>, @@ -319,6 +321,7 @@ impl Build { archiver: None, cargo_metadata: true, pic: None, + use_plt: None, static_crt: None, warnings: None, extra_warnings: None, @@ -822,6 +825,21 @@ impl Build { self } + /// Configures whether the Procedure Linkage Table is used for indirect + /// calls into shared libraries. + /// + /// The PLT is used to provide features like lazy binding, but introduces + /// a small performance loss due to extra pointer indirection. Setting + /// `use_plt` to `false` can provide a small performance increase. + /// + /// Note that skipping the PLT requires a recent version of GCC/Clang. + /// + /// This only applies to ELF targets. It has no effect on other platforms. + pub fn use_plt(&mut self, use_plt: bool) -> &mut Build { + self.use_plt = Some(use_plt); + self + } + /// Configures whether the /MT flag or the /MD flag will be passed to msvc build tools. /// /// This option defaults to `false`, and affect only msvc targets. @@ -1123,6 +1141,11 @@ impl Build { } if self.pic.unwrap_or(!target.contains("windows-gnu")) { cmd.push_cc_arg("-fPIC".into()); + // PLT only applies if code is compiled with PIC support, + // and only for ELF targets. + if target.contains("linux") && !self.use_plt.unwrap_or(true) { + cmd.push_cc_arg("-fno-plt".into()); + } } } } @@ -1159,6 +1182,19 @@ impl Build { cmd.args.push("/ARCH:IA32".into()); } } + + // There is a check in corecrt.h that will generate a + // compilation error if + // _ARM_WINAPI_PARTITION_DESKTOP_SDK_AVAILABLE is + // not defined to 1. The check was added in Windows + // 8 days because only store apps were allowed on ARM. + // This changed with the release of Windows 10 IoT Core. + // The check will be going away in future versions of + // the SDK, but for all released versions of the + // Windows SDK it is required. + if target.contains("arm") || target.contains("thumb") { + cmd.args.push("/D_ARM_WINAPI_PARTITION_DESKTOP_SDK_AVAILABLE=1".into()); + } } ToolFamily::Gnu => { if target.contains("i686") || target.contains("i586") { @@ -1214,6 +1250,11 @@ impl Build { if target.starts_with("arm-unknown-linux-") { cmd.args.push("-march=armv6".into()); cmd.args.push("-marm".into()); + if target.ends_with("hf") { + cmd.args.push("-mfpu=vfp".into()); + } else { + cmd.args.push("-mfloat-abi=soft".into()); + } } // We can guarantee some settings for FRC @@ -1264,6 +1305,16 @@ impl Build { if target.starts_with("thumbv7m") { cmd.args.push("-march=armv7-m".into()); } + if target.starts_with("thumbv8m.base") { + cmd.args.push("-march=armv8-m.base".into()); + } + if target.starts_with("thumbv8m.main") { + cmd.args.push("-march=armv8-m.main".into()); + + if target.ends_with("eabihf") { + cmd.args.push("-mfpu=fpv5-sp-d16".into()) + } + } if target.starts_with("armebv7r") | target.starts_with("armv7r") { if target.starts_with("armeb") { cmd.args.push("-mbig-endian".into()); @@ -1718,6 +1769,9 @@ impl Build { "thumbv7em-none-eabi" => Some("arm-none-eabi"), "thumbv7em-none-eabihf" => Some("arm-none-eabi"), "thumbv7m-none-eabi" => Some("arm-none-eabi"), + "thumbv8m.base-none-eabi" => Some("arm-none-eabi"), + "thumbv8m.main-none-eabi" => Some("arm-none-eabi"), + "thumbv8m.main-none-eabihf" => Some("arm-none-eabi"), "x86_64-pc-windows-gnu" => Some("x86_64-w64-mingw32"), "x86_64-rumprun-netbsd" => Some("x86_64-rumprun-netbsd"), "x86_64-unknown-linux-musl" => Some("musl"), |