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Merge pull request #23 from jvff/split-off-secp256k1-build 

Build the `secp256k1` C files separately
This commit is contained in:
Janito Vaqueiro Ferreira Filho 2021-07-15 16:15:50 -03:00 committed by GitHub
parent 7ea844c80f ba8beb2dc0
commit ffb4c0cb76
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 101 additions and 55 deletions
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156
build.rs
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@ -46,26 +46,12 @@ fn bindgen_headers() -> Result<()> {
fn main() -> Result<()> {
bindgen_headers()?;
// Check whether we can use 64-bit compilation
let use_64bit_compilation = if env::var("CARGO_CFG_TARGET_POINTER_WIDTH").unwrap() == "64" {
let check = cc::Build::new()
.file("depend/check_uint128_t.c")
.cargo_metadata(false)
.try_compile("check_uint128_t")
.is_ok();
if !check {
println!("cargo:warning=Compiling in 32-bit mode on a 64-bit architecture due to lack of uint128_t support.");
}
check
} else {
false
};
let target = env::var("TARGET").expect("TARGET was not set");
let is_big_endian = env::var("CARGO_CFG_TARGET_ENDIAN").expect("No endian is set") == "big";
let mut base_config = cc::Build::new();
language_std(&mut base_config, "c++17");
base_config
.cpp(true)
.include("depend/zcash/src")
.include("depend/zcash/src/rust/include/")
.include("depend/zcash/src/secp256k1/include")
@ -73,50 +59,15 @@ fn main() -> Result<()> {
.flag_if_supported("-Wno-catch-value")
.flag_if_supported("-Wno-reorder")
.flag_if_supported("-Wno-deprecated-copy")
.flag_if_supported("-Wno-unused-parameter")
// when compiling using Microsoft Visual C++, ignore warnings about unused arguments
.flag_if_supported("/wd4100")
.define("HAVE_DECL_STRNLEN", "1")
.define("__STDC_FORMAT_MACROS", None);
// **Secp256k1**
if !cfg!(feature = "external-secp") {
base_config
.include("depend/zcash/src/secp256k1")
.flag_if_supported("-Wno-unused-function") // some ecmult stuff is defined but not used upstream
.flag_if_supported("-Wno-missing-field-initializers")
.define("SECP256K1_BUILD", "1")
// zcash core defines libsecp to *not* use libgmp.
.define("USE_NUM_NONE", "1")
.define("USE_FIELD_INV_BUILTIN", "1")
.define("USE_SCALAR_INV_BUILTIN", "1")
.define("ECMULT_WINDOW_SIZE", "15")
.define("ECMULT_GEN_PREC_BITS", "4")
// Use the endomorphism optimization now that the patents have expired.
.define("USE_ENDOMORPHISM", "1")
// Technically libconsensus doesn't require the recovery feature, but `pubkey.cpp` does.
.define("ENABLE_MODULE_RECOVERY", "1")
// The actual libsecp256k1 C code.
.file("depend/zcash/src/secp256k1/src/secp256k1.c");
if is_big_endian {
base_config.define("WORDS_BIGENDIAN", "1");
}
if use_64bit_compilation {
base_config
.define("USE_FIELD_5X52", "1")
.define("USE_SCALAR_4X64", "1")
.define("HAVE___INT128", "1");
} else {
base_config
.define("USE_FIELD_10X26", "1")
.define("USE_SCALAR_8X32", "1");
}
}
let tool = base_config.get_compiler();
if tool.is_like_msvc() {
base_config.flag("/std:c++17").flag("/wd4100");
} else if tool.is_like_clang() || tool.is_like_gnu() {
base_config.flag("-std=c++17").flag("-Wno-unused-parameter");
build_secp256k1();
}
if target.contains("windows") {
@ -142,3 +93,98 @@ fn main() -> Result<()> {
Ok(())
}
/// Build the `secp256k1` library.
fn build_secp256k1() {
let mut build = cc::Build::new();
// Compile C99 code
language_std(&mut build, "c99");
// Define configuration constants
build
.define("SECP256K1_BUILD", "1")
.define("USE_NUM_NONE", "1")
.define("USE_FIELD_INV_BUILTIN", "1")
.define("USE_SCALAR_INV_BUILTIN", "1")
.define("ECMULT_WINDOW_SIZE", "15")
.define("ECMULT_GEN_PREC_BITS", "4")
// Use the endomorphism optimization now that the patents have expired.
.define("USE_ENDOMORPHISM", "1")
// Technically libconsensus doesn't require the recovery feature, but `pubkey.cpp` does.
.define("ENABLE_MODULE_RECOVERY", "1")
// The source files look for headers inside an `include` sub-directory
.include("depend/zcash/src/secp256k1")
// Some ecmult stuff is defined but not used upstream
.flag_if_supported("-Wno-unused-function")
.flag_if_supported("-Wno-unused-parameter");
if is_big_endian() {
build.define("WORDS_BIGENDIAN", "1");
}
if is_64bit_compilation() {
build
.define("USE_FIELD_5X52", "1")
.define("USE_SCALAR_4X64", "1")
.define("HAVE___INT128", "1");
} else {
build
.define("USE_FIELD_10X26", "1")
.define("USE_SCALAR_8X32", "1");
}
build
.file("depend/zcash/src/secp256k1/src/secp256k1.c")
.compile("libsecp256k1.a");
}
/// Checker whether the target architecture is big endian.
fn is_big_endian() -> bool {
let endianess = env::var("CARGO_CFG_TARGET_ENDIAN").expect("No endian is set");
endianess == "big"
}
/// Check whether we can use 64-bit compilation.
fn is_64bit_compilation() -> bool {
let target_pointer_width =
env::var("CARGO_CFG_TARGET_POINTER_WIDTH").expect("Target pointer width is not set");
if target_pointer_width == "64" {
let check = cc::Build::new()
.file("depend/check_uint128_t.c")
.cargo_metadata(false)
.try_compile("check_uint128_t")
.is_ok();
if !check {
println!(
"cargo:warning=Compiling in 32-bit mode on a 64-bit architecture due to lack of \
uint128_t support."
);
}
check
} else {
false
}
}
/// Configure the language standard used in the build.
///
/// Configures the appropriate flag based on the compiler that's used.
///
/// This will also enable or disable the `cpp` flag if the standard is for C++. The code determines
/// this based on whether `std` starts with `c++` or not.
fn language_std(build: &mut cc::Build, std: &str) {
build.cpp(std.starts_with("c++"));
let flag = if build.get_compiler().is_like_msvc() {
"/std:"
} else {
"-std="
};
build.flag(&[flag, std].concat());
}