1 files changed, 83 insertions, 0 deletions
diff --git a/src/a_targ.c b/src/a_targ.c
index 1513bc6..f6e060c 100644
--- a/src/a_targ.c
+++ b/src/a_targ.c
@@ -67,6 +67,87 @@ parsetriple(TargTriple *trg, const char *str)
    return 1;
 }
 
+static const char *const ospredefs[] = {
+   [OSlinux] = "__linux\0__linux__\0linux\0unix\0__unix\0__unix__\0__ELF__\0",
+   [OSopenbsd] = "__OpenBSD__\0unix\0__unix\0__unix__\0__ELF__\0"
+}, *archpredefs[] = {
+   [ISx86_64] = "__x86_64__\0__x86_64\0__amd64__\0__amd64\0",
+   [ISaarch64] = "__aarch64__\0__aarch64\0",
+};
+
+/* https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html */
+static void
+putpredefmacros(void)
+{
+   for (const char *s = ospredefs[target.os]; s && *s; s = s + strlen(s)+1)
+      cpp0define(s, NULL);
+   for (const char *s = archpredefs[target.arch]; s && *s; s = s + strlen(s)+1)
+      cpp0define(s, NULL);
+   if (ccopt.pie)
+      cpp0define("__pie__", NULL), cpp0define("__PIE__", NULL);
+   if (ccopt.pic)
+      cpp0define("__pic__", NULL), cpp0define("__PIC__", NULL);
+
+   if (targ_primsizes[TYPTR] == 4)
+      cpp0define("_ILP32", NULL), cpp0define("__ILP32__", NULL);
+   else if (targ_primsizes[TYLONG] == 4)
+      cpp0define("_LLP64", NULL), cpp0define("__LLP64__", NULL);
+   else {
+      assert(targ_primsizes[TYINT] == 4);
+      cpp0define("_LP64", NULL), cpp0define("__LP64__", NULL);
+   }
+
+   if (!targ_charsigned) cpp0define("__CHAR_UNSIGNED__", NULL);
+   /* __SIZE_TYPE__ & co. */
+   int i64t = targ_primsizes[TYLONG] == 8 ? TYLONG : TYVLONG;
+#define DEFTYP(T,tt) cpp0define("__"T"_TYPE__", primtypenames[tt]);
+   DEFTYP("SIZE", targ_sizetype);
+   DEFTYP("PTRDIFF", targ_ptrdifftype);
+   DEFTYP("WCHAR", targ_wchartype);
+   DEFTYP("WINT", targ_wchartype - isunsignedt(targ_wchartype));
+   DEFTYP("INTMAX", i64t);
+   DEFTYP("UINTMAX", i64t+1);
+   DEFTYP("SIG_ATOMIC", TYINT);
+   DEFTYP("INT8", TYSCHAR);
+   DEFTYP("INT16", TYSHORT);
+   DEFTYP("INT32", TYINT);
+   DEFTYP("INT64", i64t);
+   DEFTYP("UINT8", TYUCHAR);
+   DEFTYP("UINT16", TYUSHORT);
+   DEFTYP("UINT32", TYUINT);
+   DEFTYP("UINT64", i64t+1);
+   DEFTYP("INT_LEAST8", TYSCHAR);
+   DEFTYP("INT_LEAST16", TYSHORT);
+   DEFTYP("INT_LEAST32", TYINT);
+   DEFTYP("INT_LEAST64", i64t);
+   DEFTYP("UINT_LEAST8", TYUCHAR);
+   DEFTYP("UINT_LEAST16", TYUSHORT);
+   DEFTYP("UINT_LEAST32", TYUINT);
+   DEFTYP("UINT_LEAST64", i64t+1);
+   DEFTYP("INTPTR", targ_64bit ? i64t : TYINT);
+   DEFTYP("UINTPTR", targ_64bit ? i64t : TYINT);
+#undef DEFTYP
+   static const char atoi[][3] = {[1]="1",[2]="2",[4]="4",[8]="8",[16]="16"};
+#define TYPSIZ(T,n) cpp0define("__SIZEOF_"T"__", atoi[targ_primsizes[n]])
+   TYPSIZ("INT", TYINT);
+   TYPSIZ("LONG", TYLONG);
+   TYPSIZ("LONG_LONG", TYVLONG);
+   TYPSIZ("SHORT", TYSHORT);
+   TYPSIZ("POINTER", TYPTR);
+   TYPSIZ("FLOAT", TYFLOAT);
+   TYPSIZ("DOUBLE", TYDOUBLE);
+   TYPSIZ("LONG_DOUBLE", TYLDOUBLE);
+   TYPSIZ("SIZE_T", targ_sizetype);
+   TYPSIZ("WCHAR_T", targ_wchartype);
+   TYPSIZ("WINT_T", targ_wchartype);
+   TYPSIZ("PTRDIFF_T", targ_ptrdifftype);
+
+   cpp0define("__ORDER_LITTLE_ENDIAN__", "1234");
+   cpp0define("__ORDER_BIG_ENDIAN__", "4321");
+   cpp0define("__BYTE_ORDER__",
+         targ_bigendian ? "__ORDER_BIG_ENDIAN__" : "__ORDER_LITTLE_ENDIAN__");
+}
+
 bool
 targ_init(const char *starg, const TargTriple *dfault)
 {
@@ -120,5 +201,7 @@ targ_init(const char *starg, const TargTriple *dfault)
    mctarg = t->mctarg;
    targ_arch = ISx86_64;
 
+   putpredefmacros();
+
    return 1;
 }