small executable size optimizations

.gitignore

@@ -1,3 +1,4 @@
 /target
 comp.bat
 comp.sh
+report.json

Cargo.lock

@@ -114,7 +114,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3"
 dependencies = [
  "generic-array",
- "rand_core",
  "typenum",
 ]
 

Cargo.toml

@@ -8,8 +8,15 @@ edition = "2021"
 [dependencies]
 home = "0.5.4"
 rpassword = "7.2"
-rand = "0.8.5"
+rand = { features = ["std"], default-features = false, version = "0.8.5" }
-aes-gcm = "0.10.1"
+aes-gcm = { features = ["alloc", "aes"], default-features = false, version = "0.10.1" }
-sha2 = "0.10.6"
+sha2 = { default-features = false, version = "0.10.6" }
 hex = "0.4.3"
-brotli = "3.3.4"
+brotli = { features = ["std"], default-features = false, version = "3.3.4" }
+
+[profile.release]
+opt-level = 'z'     # Optimize for size
+lto = true          # Enable link-time optimization
+codegen-units = 1   # Reduce number of codegen units to increase optimizations
+panic = 'abort'     # Abort on panic
+strip = true        # Strip symbols from binary; remove pdb

optimize_dependencies.bat

@@ -0,0 +1,2 @@
+REM This uses cargo-unused-features
+unused-features analyze && unused-features prune --input report.json