fix x86_64 on clang

arch/x86_64/smp.c

@@ -51,15 +51,18 @@ static void smp_trampoline() {
         ".set .Ltemp_cr3_offset, (.Ldata_offset + %c[temp_cr3])\n"
         ".set .Lentry_offset, (.Ldata_offset + %c[entry])\n"
         ".set .Lhhdm_offset, (.Ldata_offset + %c[hhdm])\n"
+        ".set .Linvalid_idtr_offset, (.Linvalid_idtr - smp_trampoline_start)\n"
+        ".set .Lmode32_offset, (.Lmode32 - smp_trampoline_start)\n"
+        ".set .Lmode64_offset, (.Lmode64 - smp_trampoline_start)\n"
 
         ".Lmode16:\n"
         "    mov bx, cs\n"
         "    shl ebx, 4\n"
 
-        "    lidtd cs:(.Linvalid_idtr - smp_trampoline_start)\n"
+        "    lidtd cs:.Linvalid_idtr_offset\n"
         "    lgdtd cs:.Lgdtr_offset\n"
 
-        "    lea eax, [ebx + (.Lmode32 - smp_trampoline_start)]\n"
+        "    lea eax, [ebx + .Lmode32_offset]\n"
         "    mov dword ptr cs:.Lfarjmp_offset, eax\n"
 
         "    mov eax, %c[cr0]\n"
@@ -98,7 +101,7 @@ static void smp_trampoline() {
         "    or eax, %c[cr0_pg]\n"
         "    mov cr0, eax\n"
 
-        "    lea eax, [ebx + (.Lmode64 - smp_trampoline_start)]\n"
+        "    lea eax, [ebx + .Lmode64_offset]\n"
         "    push %c[kernel64_cs]\n"
         "    push eax\n"
         "    retf\n"

meson.build

@@ -44,7 +44,7 @@ common_c_args = [
 common_link_args = [
     '-ffreestanding',
     '-nostdlib',
-    '-znoexecstack',
+    '-Wl,-z,noexecstack',
     '-Wl,--gc-sections',
     '-Wl,--build-id=none',
 ]