Specify when to rebuild.

Sort of fixes #79.

This will do a quick rebuild once and than not rebuild. It does this because
of the way I set it up for the blog post to make it extra clear what runs where.

Author: LegNeato

blog/2024-11-25-optimizing-matmul/code/crates/cpu/compiled_for_gpu/isomorphic/build.rs

@@ -5,6 +5,7 @@ use std::path::{Path, PathBuf};
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let gpu_crate_path = Path::new("../../../gpu/tiling_2d");
+    println!("cargo::rerun-if-changed={}", gpu_crate_path.display());
 
     // Compile the shader crate with SpirvBuilder.
     let result = SpirvBuilder::new(gpu_crate_path, "spirv-unknown-vulkan1.2")

blog/2024-11-25-optimizing-matmul/code/crates/cpu/compiled_for_gpu/naive/build.rs

@@ -5,6 +5,7 @@ use std::path::{Path, PathBuf};
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let gpu_crate_path = Path::new("../../../gpu/naive");
+    println!("cargo::rerun-if-changed={}", gpu_crate_path.display());
 
     // Compile the shader crate with SpirvBuilder.
     let result = SpirvBuilder::new(gpu_crate_path, "spirv-unknown-vulkan1.2")

blog/2024-11-25-optimizing-matmul/code/crates/cpu/compiled_for_gpu/tiling_1d/build.rs

@@ -5,6 +5,7 @@ use std::path::{Path, PathBuf};
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let gpu_crate_path = Path::new("../../../gpu/tiling_1d");
+    println!("cargo::rerun-if-changed={}", gpu_crate_path.display());
 
     // Compile the shader crate with SpirvBuilder.
     let result = SpirvBuilder::new(gpu_crate_path, "spirv-unknown-vulkan1.2")

blog/2024-11-25-optimizing-matmul/code/crates/cpu/compiled_for_gpu/tiling_1d_loop/build.rs

@@ -5,6 +5,7 @@ use std::path::{Path, PathBuf};
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let gpu_crate_path = Path::new("../../../gpu/tiling_1d_loop");
+    println!("cargo::rerun-if-changed={}", gpu_crate_path.display());
 
     // Compile the shader crate with SpirvBuilder.
     let result = SpirvBuilder::new(gpu_crate_path, "spirv-unknown-vulkan1.2")

blog/2024-11-25-optimizing-matmul/code/crates/cpu/compiled_for_gpu/tiling_2d/build.rs

@@ -5,6 +5,7 @@ use std::path::{Path, PathBuf};
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let gpu_crate_path = Path::new("../../../gpu/tiling_2d");
+    println!("cargo::rerun-if-changed={}", gpu_crate_path.display());
 
     // Compile the shader crate with SpirvBuilder.
     let result = SpirvBuilder::new(gpu_crate_path, "spirv-unknown-vulkan1.2")

blog/2024-11-25-optimizing-matmul/code/crates/cpu/compiled_for_gpu/workgroup_256/build.rs

@@ -5,6 +5,7 @@ use std::path::{Path, PathBuf};
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let gpu_crate_path = Path::new("../../../gpu/workgroup_256");
+    println!("cargo::rerun-if-changed={}", gpu_crate_path.display());
 
     // Compile the shader crate with SpirvBuilder.
     let result = SpirvBuilder::new(gpu_crate_path, "spirv-unknown-vulkan1.2")

blog/2024-11-25-optimizing-matmul/code/crates/cpu/compiled_for_gpu/workgroup_2d/build.rs

@@ -5,6 +5,7 @@ use std::path::{Path, PathBuf};
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let gpu_crate_path = Path::new("../../../gpu/workgroup_2d");
+    println!("cargo::rerun-if-changed={}", gpu_crate_path.display());
 
     // Compile the shader crate with SpirvBuilder.
     let result = SpirvBuilder::new(gpu_crate_path, "spirv-unknown-vulkan1.2")