perf: do FAT LTO and singular codegen-unit on release (#970)

Optimize release builds by building them in a special profile release-lto that:

- Enables FAT LTO
- Uses codegen-unit = 1

This is intended to improve the quality of parseable binary compiled at release, 
in terms of performance and size.

Fixes #224 .

Author: Devdutt Shenoi

.github/workflows/release.yml

@@ -37,11 +37,11 @@ jobs:
         with:
           use-cross: true
           command: build
-          args: --release --target ${{matrix.target}}
+          args: --profile release-lto --target ${{matrix.target}}
 
       - name: Rename binary
         run: |
-          mv target/${{ matrix.target }}/release/parseable Parseable_OSS_${{ matrix.target }}
+          mv target/${{ matrix.target }}/release-lto/parseable Parseable_OSS_${{ matrix.target }}
 
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v1
@@ -82,11 +82,11 @@ jobs:
           override: true
 
       - name: Build
-        run: cargo build --all --release --target x86_64-pc-windows-msvc
+        run: cargo build --all --profile release-lto --target x86_64-pc-windows-msvc
 
       - name: Rename binary
         run: |
-          mv target/x86_64-pc-windows-msvc/release/PARSEABLE.exe Parseable_OSS_x86_64-pc-windows-msvc.exe
+          mv target/x86_64-pc-windows-msvc/release-lto/PARSEABLE.exe Parseable_OSS_x86_64-pc-windows-msvc.exe
 
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v1
@@ -135,12 +135,12 @@ jobs:
 
       - name: Build
         run: |
-          cargo build --release --target ${{ matrix.target }}
-          strip target/${{ matrix.target }}/release/Parseable
+          cargo build --profile release-lto --target ${{ matrix.target }}
+          strip target/${{ matrix.target }}/release-lto/Parseable
 
       - name: Rename binary
         run: |
-          mv target/${{ matrix.target }}/release/Parseable Parseable_OSS_${{ matrix.target }}
+          mv target/${{ matrix.target }}/release-lto/Parseable Parseable_OSS_${{ matrix.target }}
 
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v1

Cargo.toml

@@ -127,3 +127,8 @@ assets-sha1 = "9d5a45f204d709a2dd96f6a5e0b21b3834ee0e36"
 
 [features]
 debug = []
+
+[profile.release-lto]
+inherits = "release"
+lto = "fat"
+codegen-units = 1