feat: adapt to picolibc

Author: andreiltd

src/toolchain.rs

@@ -54,11 +54,8 @@ pub fn prepare(args: &Args) -> Result<()> {
         .context("Failed to create sysroot include directory")?;
 
     const INCLUDE_DIRS: &[&str] = &[
-        "third_party/printf/",
-        "third_party/musl/include",
-        "third_party/musl/arch/generic",
-        "third_party/musl/arch/x86_64",
-        "third_party/musl/src/internal",
+        "third_party/picolibc/newlib/libc/include",
+        "third_party/picolibc/newlib/libc/tinystdio",
     ];
 
     for dir in INCLUDE_DIRS {
@@ -94,7 +91,7 @@ pub fn cflags(args: &Args) -> OsString {
         "-fstack-clash-protection",
         "-mstack-probe-size=4096",
         "-mno-red-zone",
-        "-nostdinc",
+        "-nostdlibinc",
         // Define HYPERLIGHT as we use this to conditionally enable/disable code
         // in the libc headers
         "-DHYPERLIGHT=1",