extern crate gcc; extern crate rustc_cfg; use std::collections::BTreeMap; use std::io::Write; use std::path::Path; use std::{env, io, process}; use rustc_cfg::Cfg; struct Sources { // SYMBOL -> PATH TO SOURCE map: BTreeMap<&'static str, &'static str>, } impl Sources { fn new() -> Sources { Sources { map: BTreeMap::new() } } fn extend(&mut self, sources: &[&'static str]) { // NOTE Some intrinsics have both a generic implementation (e.g. // `floatdidf.c`) and an arch optimized implementation // (`x86_64/floatdidf.c`). In those cases, we keep the arch optimized // implementation and discard the generic implementation. If we don't // and keep both implementations, the linker will yell at us about // duplicate symbols! for &src in sources { let symbol = Path::new(src).file_stem().unwrap().to_str().unwrap(); if src.contains("/") { // Arch-optimized implementation (preferred) self.map.insert(symbol, src); } else { // Generic implementation if !self.map.contains_key(symbol) { self.map.insert(symbol, src); } } } } fn remove(&mut self, symbols: &[&str]) { for symbol in symbols { self.map.remove(*symbol).unwrap(); } } } fn main() { println!("cargo:rerun-if-changed=build.rs"); let target = env::var("TARGET").unwrap(); let Cfg { ref target_arch, ref target_os, ref target_env, ref target_vendor, .. } = Cfg::new(&target).unwrap_or_else(|e| { writeln!(io::stderr(), "{}", e).ok(); process::exit(1) }); // NOTE we are going to assume that llvm-target, what determines our codegen option, matches the // target triple. This is usually correct for our built-in targets but can break in presence of // custom targets, which can have arbitrary names. let llvm_target = target.split('-').collect::>(); let target_vendor = target_vendor.as_ref().unwrap(); // Build missing intrinsics from compiler-rt C source code if env::var_os("CARGO_FEATURE_C").is_some() { let cfg = &mut gcc::Config::new(); if target_env == "msvc" { // Don't pull in extra libraries on MSVC cfg.flag("/Zl"); // Emulate C99 and C++11's __func__ for MSVC prior to 2013 CTP cfg.define("__func__", Some("__FUNCTION__")); } else { // Turn off various features of gcc and such, mostly copying // compiler-rt's build system already cfg.flag("-fno-builtin"); cfg.flag("-fvisibility=hidden"); cfg.flag("-fomit-frame-pointer"); cfg.flag("-ffreestanding"); cfg.define("VISIBILITY_HIDDEN", None); } // NOTE Most of the ARM intrinsics are written in assembly. Tell gcc which arch we are going to // target to make sure that the assembly implementations really work for the target. If the // implementation is not valid for the arch, then gcc will error when compiling it. if llvm_target[0].starts_with("thumb") { cfg.flag("-mthumb"); if llvm_target.last() == Some(&"eabihf") { cfg.flag("-mfloat-abi=hard"); } } if llvm_target[0] == "thumbv6m" { cfg.flag("-march=armv6-m"); } if llvm_target[0] == "thumbv7m" { cfg.flag("-march=armv7-m"); } if llvm_target[0] == "thumbv7em" { cfg.flag("-march=armv7e-m"); } let mut sources = Sources::new(); sources.extend(&["absvdi2.c", "absvsi2.c", "addvdi3.c", "addvsi3.c", "apple_versioning.c", "clear_cache.c", "clzdi2.c", "clzsi2.c", "cmpdi2.c", "comparedf2.c", "comparesf2.c", "ctzdi2.c", "ctzsi2.c", "divdc3.c", "divdf3.c", "divsc3.c", "divsf3.c", "divxc3.c", "extendsfdf2.c", "extendhfsf2.c", "ffsdi2.c", "fixdfdi.c", "fixdfsi.c", "fixsfdi.c", "fixsfsi.c", "fixunsdfdi.c", "fixunsdfsi.c", "fixunssfdi.c", "fixunssfsi.c", "fixunsxfdi.c", "fixunsxfsi.c", "fixxfdi.c", "floatdidf.c", "floatdisf.c", "floatdixf.c", "floatsidf.c", "floatsisf.c", "floatundidf.c", "floatundisf.c", "floatundixf.c", "floatunsidf.c", "floatunsisf.c", "int_util.c", "muldc3.c", "muldf3.c", "muloti4.c", "mulsc3.c", "mulsf3.c", "mulvdi3.c", "mulvsi3.c", "mulxc3.c", "negdf2.c", "negdi2.c", "negsf2.c", "negvdi2.c", "negvsi2.c", "paritydi2.c", "paritysi2.c", "popcountdi2.c", "popcountsi2.c", "powixf2.c", "subdf3.c", "subsf3.c", "subvdi3.c", "subvsi3.c", "truncdfhf2.c", "truncdfsf2.c", "truncsfhf2.c", "ucmpdi2.c"]); if target_os != "ios" { sources.extend(&["absvti2.c", "addtf3.c", "addvti3.c", "ashlti3.c", "ashrti3.c", "clzti2.c", "cmpti2.c", "ctzti2.c", "divtf3.c", "divti3.c", "ffsti2.c", "fixdfti.c", "fixsfti.c", "fixunsdfti.c", "fixunssfti.c", "fixunsxfti.c", "fixxfti.c", "floattidf.c", "floattisf.c", "floattixf.c", "floatuntidf.c", "floatuntisf.c", "floatuntixf.c", "lshrti3.c", "modti3.c", "multf3.c", "multi3.c", "mulvti3.c", "negti2.c", "negvti2.c", "parityti2.c", "popcountti2.c", "powitf2.c", "subtf3.c", "subvti3.c", "trampoline_setup.c", "ucmpti2.c", "udivmodti4.c", "udivti3.c", "umodti3.c"]); } if target_vendor == "apple" { sources.extend(&["atomic_flag_clear.c", "atomic_flag_clear_explicit.c", "atomic_flag_test_and_set.c", "atomic_flag_test_and_set_explicit.c", "atomic_signal_fence.c", "atomic_thread_fence.c"]); } if target_os != "windows" && target_os != "none" { sources.extend(&["emutls.c"]); } if target_env == "msvc" { if target_arch == "x86_64" { sources.extend(&["x86_64/floatdidf.c", "x86_64/floatdisf.c", "x86_64/floatdixf.c"]); } } else { if target_os != "freebsd" { sources.extend(&["gcc_personality_v0.c"]); } if target_arch == "x86_64" { sources.extend(&["x86_64/chkstk.S", "x86_64/chkstk2.S", "x86_64/floatdidf.c", "x86_64/floatdisf.c", "x86_64/floatdixf.c", "x86_64/floatundidf.S", "x86_64/floatundisf.S", "x86_64/floatundixf.S"]); } if target_arch == "x86" { sources.extend(&["i386/ashldi3.S", "i386/ashrdi3.S", "i386/chkstk.S", "i386/chkstk2.S", "i386/divdi3.S", "i386/floatdidf.S", "i386/floatdisf.S", "i386/floatdixf.S", "i386/floatundidf.S", "i386/floatundisf.S", "i386/floatundixf.S", "i386/lshrdi3.S", "i386/moddi3.S", "i386/muldi3.S", "i386/udivdi3.S", "i386/umoddi3.S"]); } } if target_arch == "arm" && target_os != "ios" { sources.extend(&["arm/aeabi_cdcmp.S", "arm/aeabi_cdcmpeq_check_nan.c", "arm/aeabi_cfcmp.S", "arm/aeabi_cfcmpeq_check_nan.c", "arm/aeabi_dcmp.S", "arm/aeabi_div0.c", "arm/aeabi_drsub.c", "arm/aeabi_fcmp.S", "arm/aeabi_frsub.c", "arm/bswapdi2.S", "arm/bswapsi2.S", "arm/clzdi2.S", "arm/clzsi2.S", "arm/comparesf2.S", "arm/divmodsi4.S", "arm/divsi3.S", "arm/modsi3.S", "arm/switch16.S", "arm/switch32.S", "arm/switch8.S", "arm/switchu8.S", "arm/sync_synchronize.S", "arm/udivmodsi4.S", "arm/udivsi3.S", "arm/umodsi3.S"]); } if llvm_target[0] == "armv7" { sources.extend(&["arm/sync_fetch_and_add_4.S", "arm/sync_fetch_and_add_8.S", "arm/sync_fetch_and_and_4.S", "arm/sync_fetch_and_and_8.S", "arm/sync_fetch_and_max_4.S", "arm/sync_fetch_and_max_8.S", "arm/sync_fetch_and_min_4.S", "arm/sync_fetch_and_min_8.S", "arm/sync_fetch_and_nand_4.S", "arm/sync_fetch_and_nand_8.S", "arm/sync_fetch_and_or_4.S", "arm/sync_fetch_and_or_8.S", "arm/sync_fetch_and_sub_4.S", "arm/sync_fetch_and_sub_8.S", "arm/sync_fetch_and_umax_4.S", "arm/sync_fetch_and_umax_8.S", "arm/sync_fetch_and_umin_4.S", "arm/sync_fetch_and_umin_8.S", "arm/sync_fetch_and_xor_4.S", "arm/sync_fetch_and_xor_8.S"]); } if llvm_target.last().unwrap().ends_with("eabihf") { if !llvm_target[0].starts_with("thumbv7em") { sources.extend(&["arm/adddf3vfp.S", "arm/addsf3vfp.S", "arm/divdf3vfp.S", "arm/divsf3vfp.S", "arm/eqdf2vfp.S", "arm/eqsf2vfp.S", "arm/extendsfdf2vfp.S", "arm/fixdfsivfp.S", "arm/fixsfsivfp.S", "arm/fixunsdfsivfp.S", "arm/fixunssfsivfp.S", "arm/floatsidfvfp.S", "arm/floatsisfvfp.S", "arm/floatunssidfvfp.S", "arm/floatunssisfvfp.S", "arm/gedf2vfp.S", "arm/gesf2vfp.S", "arm/gtdf2vfp.S", "arm/gtsf2vfp.S", "arm/ledf2vfp.S", "arm/lesf2vfp.S", "arm/ltdf2vfp.S", "arm/ltsf2vfp.S", "arm/muldf3vfp.S", "arm/mulsf3vfp.S", "arm/nedf2vfp.S", "arm/nesf2vfp.S", "arm/restore_vfp_d8_d15_regs.S", "arm/save_vfp_d8_d15_regs.S", "arm/subdf3vfp.S", "arm/subsf3vfp.S"]); } sources.extend(&["arm/negdf2vfp.S", "arm/negsf2vfp.S"]); } if target_arch == "aarch64" { sources.extend(&["comparetf2.c", "extenddftf2.c", "extendsftf2.c", "fixtfdi.c", "fixtfsi.c", "fixtfti.c", "fixunstfdi.c", "fixunstfsi.c", "fixunstfti.c", "floatditf.c", "floatsitf.c", "floatunditf.c", "floatunsitf.c", "multc3.c", "trunctfdf2.c", "trunctfsf2.c"]); } // Remove the assembly implementations that won't compile for the target if llvm_target[0] == "thumbv6m" { sources.remove(&["aeabi_cdcmp", "aeabi_cfcmp", "aeabi_dcmp", "aeabi_fcmp", "clzdi2", "clzsi2", "comparesf2", "divmodsi4", "divsi3", "modsi3", "switch16", "switch32", "switch8", "switchu8", "udivmodsi4", "udivsi3", "umodsi3"]); // But use some generic implementations where possible sources.extend(&["clzdi2.c", "clzsi2.c"]) } if llvm_target[0] == "thumbv7m" || llvm_target[0] == "thumbv7em" { sources.remove(&["aeabi_cdcmp", "aeabi_cfcmp"]); } let root = if env::var_os("CARGO_FEATURE_RUSTBUILD").is_some() { Path::new("../../libcompiler_builtins") } else { Path::new(".") }; let src_dir = root.join("compiler-rt/lib/builtins"); for src in sources.map.values() { let src = src_dir.join(src); cfg.file(&src); println!("cargo:rerun-if-changed={}", src.display()); } cfg.compile("libcompiler-rt.a"); } // To filter away some flaky test (see src/float/add.rs for details) if llvm_target[0].starts_with("arm") && llvm_target.last().unwrap().contains("gnueabi") { println!("cargo:rustc-cfg=arm_linux") } // To compile intrinsics.rs for thumb targets, where there is no libc if llvm_target[0].starts_with("thumb") { println!("cargo:rustc-cfg=thumb") } // compiler-rt `cfg`s away some intrinsics for thumbv6m because that target doesn't have full // THUMBv2 support. We have to cfg our code accordingly. if llvm_target[0] == "thumbv6m" { println!("cargo:rustc-cfg=thumbv6m") } }