diff --git a/core/mem/virtual/virtual_darwin.odin b/core/mem/virtual/virtual_darwin.odin
index 5505149b0..bd1336cba 100644
--- a/core/mem/virtual/virtual_darwin.odin
+++ b/core/mem/virtual/virtual_darwin.odin
@@ -136,7 +136,7 @@ _protect :: proc "contextless" (data: rawptr, size: uint, flags: Protect_Flags)
 	if .Write   in flags { pflags |= PROT_WRITE }
 	if .Execute in flags { pflags |= PROT_EXEC  }
 	err := _mprotect(data, size, pflags)
-	return err != 0
+	return err == 0
 }
 
 
diff --git a/core/mem/virtual/virtual_linux.odin b/core/mem/virtual/virtual_linux.odin
index 7ffc7643e..b927f2877 100644
--- a/core/mem/virtual/virtual_linux.odin
+++ b/core/mem/virtual/virtual_linux.odin
@@ -40,7 +40,7 @@ _protect :: proc "contextless" (data: rawptr, size: uint, flags: Protect_Flags)
 	if .Write   in flags { pflags |= {.WRITE} }
 	if .Execute in flags { pflags |= {.EXEC}  }
 	errno := linux.mprotect(data, size, pflags)
-	return errno != .NONE
+	return errno == .NONE
 }
 
 _platform_memory_init :: proc() {
diff --git a/default.nix b/default.nix
deleted file mode 100644
index 64d20f674..000000000
--- a/default.nix
+++ /dev/null
@@ -1,27 +0,0 @@
-{ pkgs ? import <nixpkgs> { } }:
-let
-  odin-unwrapped = pkgs.llvmPackages_11.stdenv.mkDerivation (rec {
-    name = "odin-unwrapped";
-    src = ./.;
-    dontConfigure = true;
-    nativeBuildInputs = [ pkgs.git ];
-    buildPhase = ''
-      make debug SHELL=${pkgs.llvmPackages_11.stdenv.shell}
-    '';
-    installPhase = ''
-      mkdir -p $out/bin
-      cp odin $out/bin/odin
-      cp -r core $out/bin/core
-    '';
-  });
-  path = builtins.map (path: path + "/bin") (with pkgs.llvmPackages_11; [
-    bintools
-    llvm
-    clang
-    lld
-  ]);
-in
-pkgs.writeScriptBin "odin" ''
-  #!${pkgs.llvmPackages_11.stdenv.shell} 
-  PATH="${(builtins.concatStringsSep ":" path)}" exec ${odin-unwrapped}/bin/odin $@
-''
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 000000000..21301b9d7
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,11 @@
+{ pkgs ? import <nixpkgs> {} }:
+pkgs.mkShell {
+  name = "odin";
+  nativeBuildInputs = with pkgs; [
+    git
+    clang_17
+    llvmPackages_17.llvm
+    llvmPackages_17.bintools
+  ];
+  shellHook="CXX=clang++";
+}
diff --git a/src/build_settings.cpp b/src/build_settings.cpp
index 9d909fcae..1f57b5625 100644
--- a/src/build_settings.cpp
+++ b/src/build_settings.cpp
@@ -582,7 +582,13 @@ gb_global TargetMetrics target_freestanding_amd64_sysv = {
 	TargetABI_SysV,
 };
 
-
+gb_global TargetMetrics target_freestanding_arm64 = {
+	TargetOs_freestanding,
+	TargetArch_arm64,
+	8, 8, 8, 16,
+	str_lit("aarch64-none-elf"),
+	str_lit("e-m:o-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"),
+};
 
 struct NamedTargetMetrics {
 	String name;
@@ -617,6 +623,7 @@ gb_global NamedTargetMetrics named_targets[] = {
 	{ str_lit("wasi_wasm64p32"),         &target_wasi_wasm64p32 },
 
 	{ str_lit("freestanding_amd64_sysv"), &target_freestanding_amd64_sysv },
+	{ str_lit("freestanding_arm64"), &target_freestanding_arm64 },
 };
 
 gb_global NamedTargetMetrics *selected_target_metrics;
diff --git a/src/exact_value.cpp b/src/exact_value.cpp
index cd499272f..b744d2db0 100644
--- a/src/exact_value.cpp
+++ b/src/exact_value.cpp
@@ -174,7 +174,7 @@ gb_internal ExactValue exact_value_integer_from_string(String const &string) {
 
 
 
-gb_internal f64 float_from_string(String const &string) {
+gb_internal f64 float_from_string(String const &string, bool *success = nullptr) {
 	if (string.len < 128) {
 		char buf[128] = {};
 		isize n = 0;
@@ -187,7 +187,13 @@ gb_internal f64 float_from_string(String const &string) {
 			buf[n++] = cast(char)c;
 		}
 		buf[n] = 0;
-		return atof(buf);
+
+		char *end_ptr;
+		f64 f = strtod(buf, &end_ptr);
+		if (success != nullptr) {
+			*success = *end_ptr == '\0';
+		}
+		return f;
 	} else {
 		TEMPORARY_ALLOCATOR_GUARD();
 		char *buf = gb_alloc_array(temporary_allocator(), char, string.len+1);
@@ -201,7 +207,13 @@ gb_internal f64 float_from_string(String const &string) {
 			buf[n++] = cast(char)c;
 		}
 		buf[n] = 0;
-		return atof(buf);
+
+		char *end_ptr;
+		f64 f = strtod(buf, &end_ptr);
+		if (success != nullptr) {
+			*success = *end_ptr == '\0';
+		}
+		return f;
 	}
 /*
 	isize i = 0;
@@ -313,7 +325,11 @@ gb_internal ExactValue exact_value_float_from_string(String string) {
 		return exact_value_integer_from_string(string);
 	}
 
-	f64 f = float_from_string(string);
+	bool success;
+	f64 f = float_from_string(string, &success);
+	if (!success) {
+		return {ExactValue_Invalid};
+	}
 	return exact_value_float(f);
 }
 
diff --git a/src/gb/gb.h b/src/gb/gb.h
index 5dae7a5c4..93d250f21 100644
--- a/src/gb/gb.h
+++ b/src/gb/gb.h
@@ -448,7 +448,7 @@ typedef i32 b32; // NOTE(bill): Prefer this!!!
 		#define gb_inline __forceinline
 		#endif
 	#else
-		#define gb_inline __attribute__ ((__always_inline__))
+		#define gb_inline inline __attribute__ ((__always_inline__))
 	#endif
 #endif
 
diff --git a/src/llvm_backend.cpp b/src/llvm_backend.cpp
index 0175d039e..003424e0a 100644
--- a/src/llvm_backend.cpp
+++ b/src/llvm_backend.cpp
@@ -2503,7 +2503,7 @@ gb_internal bool lb_generate_code(lbGenerator *gen) {
 	LLVMCodeModel code_mode = LLVMCodeModelDefault;
 	if (is_arch_wasm()) {
 		code_mode = LLVMCodeModelJITDefault;
-	} else if (build_context.metrics.os == TargetOs_freestanding) {
+	} else if (is_arch_x86() && build_context.metrics.os == TargetOs_freestanding) {
 		code_mode = LLVMCodeModelKernel;
 	}