Add build test

.gitignore

@@ -2,4 +2,9 @@ print
 print_aarch64
 print_mips32
 print_x64
+bldtst
+bldtst_aarch64
+bldtst_mips32
+bldtst_x64
+bldtst_llvm
 a.out

Makefile

@@ -1,12 +1,19 @@
-all: print print_x64 print_aarch64 print_mips32
+all: print print_x64 print_aarch64 print_mips32 buildtest
 
 clean: 
 	if test -f print; then rm print; fi
 	if test -f print_x64; then rm print_x64; fi
 	if test -f print_aarch64; then rm print_aarch64; fi
 	if test -f print_mips32; then rm print_mips32; fi
+	if test -f bldtst; then rm bldtst; fi
+	if test -f bldtst_llvm; then rm bldtst_llvm; fi
+	if test -f bldtst_x64; then rm bldtst_x64; fi
+	if test -f bldtst_aarch64; then rm bldtst_aarch64; fi
+	if test -f bldtst_mips32; then rm bldtst_mips32; fi
 
-.PHONY: all clean
+buildtest: bldtst bldtst_llvm bldtst_x64 bldtst_aarch64 bldtst_mips32
+
+.PHONY: all buildtest clean
 
 print:
 	gcc -static -nostdlib -Wno-builtin-declaration-mismatch -fno-stack-protector -o print print.c
@@ -18,3 +25,20 @@ print_aarch64: print.c
 
 print_mips32: print.c
 	clang --target=mips-linux-gnu -nostdlib -static -fuse-ld=lld -fno-stack-protector -fno-pic -o print_mips32 print.c
+
+
+
+bldtst: buildtest.c arch/*.c
+	gcc -static -nostdlib -Wno-builtin-declaration-mismatch -fno-stack-protector -o bldtst buildtest.c arch/*.c
+
+bldtst_llvm: buildtest.c arch/*.c
+	clang -nostdlib -static -fuse-ld=lld -fno-stack-protector -o bldtst_llvm buildtest.c arch/*.c
+
+bldtst_x64: buildtest.c arch/x86_64.c
+	clang --target=x86_64-linux-gnu -nostdlib -static -fuse-ld=lld -fno-stack-protector -o bldtst_x64 buildtest.c arch/x86_64.c
+
+bldtst_aarch64: buildtest.c
+	clang --target=aarch64-linux-gnu -nostdlib -static -fuse-ld=lld -fno-stack-protector -o bldtst_aarch64 buildtest.c arch/aarch64.c
+
+bldtst_mips32: buildtest.c
+	clang --target=mips-linux-gnu -nostdlib -static -fuse-ld=lld -fno-stack-protector -fno-pic -o bldtst_mips32 buildtest.c arch/mips.c

buildtest.c

@@ -0,0 +1,48 @@
+#include <stdint.h>
+#include "sys.h"
+
+
+int main() {
+#if defined(__x86_64__) || defined(__aarch64__) || defined(__mips__)
+  uint64_t pid = fork();
+  char msg[17] = {' '};
+  msg[16] = '\n';
+  for(int i = 0; i < 16; ++i) {
+    char nibble = (pid >> ((15 - i) * 4)) & 0xf;
+    char c;
+    if (nibble > 9) {c = nibble + '7';}
+    else {c = nibble + '0';}
+    msg[i] = c;
+  }
+  write(STDIO, msg, 17);
+  #else
+  char *msg = "Hello World!\n";
+  write(STDIO, msg, 13);
+#endif
+  return 69;
+}
+void __libc_start_main() {exit(main());}
+
+void _start() {
+  __libc_start_main();
+}
+
+void __start() {
+  _start();
+}
+/*
+#if defined(__x86_64__)
+        printf("Compiled for x86_64 architecture\n");
+    #elif defined(__i386__)
+        printf("Compiled for x86 architecture\n");
+    #elif defined(__arm__)
+        printf("Compiled for ARM architecture\n");
+    #elif defined(__aarch64__)
+        printf("Compiled for ARM64 architecture\n");
+    #elif defined(__mips__)
+        printf("Compiled for ARM architecture\n");
+    #else
+        printf("Unknown architecture\n");
+    #endif
+*/
+