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Define ECMULT_GEN_PREC_BITS 

This is configurable in upstream now.

Fixes #214.

So far, this just sets it to `4`. It's tempting to set it to `2` when `lowmemory` is enabled
but `lowmemory` is about RAM and not about binary size. This is better addressed by
a resolution of #193.
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Tim Ruffing 2020-05-13 10:40:39 +02:00 committed by GitHub
parent 0782872fb0
commit 489e3ff8d2
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1 changed files with 4 additions and 3 deletions
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secp256k1-sys/build.rs
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@ -52,11 +52,12 @@ fn main() {
.include("depend/secp256k1/src") .include("depend/secp256k1/src")
.flag_if_supported("-Wno-unused-function") // some ecmult stuff is defined but not used upstream .flag_if_supported("-Wno-unused-function") // some ecmult stuff is defined but not used upstream
.define("SECP256K1_BUILD", Some("1")) .define("SECP256K1_BUILD", Some("1"))
.define("ENABLE_MODULE_ECDH", Some("1"))
.define("ECMULT_GEN_PREC_BITS", Some("4"))
// TODO these three should be changed to use libgmp, at least until secp PR 290 is merged // TODO these three should be changed to use libgmp, at least until secp PR 290 is merged
.define("USE_NUM_NONE", Some("1")) .define("USE_NUM_NONE", Some("1"))
.define("USE_FIELD_INV_BUILTIN", Some("1")) .define("USE_FIELD_INV_BUILTIN", Some("1"))
.define("USE_SCALAR_INV_BUILTIN", Some("1")) .define("USE_SCALAR_INV_BUILTIN", Some("1"));
.define("ENABLE_MODULE_ECDH", Some("1"));
if cfg!(feature = "lowmemory") { if cfg!(feature = "lowmemory") {
base_config.define("ECMULT_WINDOW_SIZE", Some("4")); // A low-enough value to consume neglible memory base_config.define("ECMULT_WINDOW_SIZE", Some("4")); // A low-enough value to consume neglible memory