build: rework how sysroots work

/usr/include is now built on the fly, letting me merge include files from
multiple modules, which should be a win for organization later on.

binutils & gcc need to be recompiled.

limits.h shamelessly stolen from heat on #osdev, as gcc stopped providing me
with its own header. which was a hack in the first place

1 files changed, 45 insertions, 0 deletions

diff --git a/src/libk/include/bits/limits.h b/src/libk/include/bits/limits.h
new file mode 100644
index 0000000..a64302e
--- /dev/null
+++ b/src/libk/include/bits/limits.h
@@ -0,0 +1,45 @@
+/** Adapted from code (c) 2023 Pedro Falcato, with permission.
+ * Originally licensed under BSD-2-Clause-Patent.
+ */
+
+#if defined (__LP64__)
+#define __LIMITS_64BIT
+#endif
+
+#define CHAR_BIT 8
+
+#define SCHAR_MIN -128
+#define SCHAR_MAX 127
+#define UCHAR_MAX 255
+
+#if '\xff' < 0
+/* char is signed */
+#  define CHAR_MIN  SCHAR_MIN
+#  define CHAR_MAX  SCHAR_MAX
+#else
+/* char is unsigned */
+#  define CHAR_MIN  0
+#  define CHAR_MAX  UCHAR_MAX
+#endif
+
+#define SHRT_MIN   (-1 - 0x7fff)
+#define SHRT_MAX   0x7fff
+#define USHRT_MAX  0xffff
+
+#define INT_MIN   (-1 - 0x7fffffff)
+#define INT_MAX   0x7fffffff
+#define UINT_MAX  0xffffffffU
+
+#ifdef __LIMITS_64BIT
+#  define LONG_MAX   0x7fffffffffffffffL
+#  define LONG_MIN   (-1 - 0x7fffffffffffffffL)
+#  define ULONG_MAX  0xffffffffffffffffUL
+#else
+#  define LONG_MAX   0x7fffffffL
+#  define LONG_MIN   (-1 - 0x7fffffffL)
+#  define ULONG_MAX  0xffffffffUL
+#endif
+
+#define LLONG_MIN   (-1 - 0x7fffffffffffffffLL)
+#define LLONG_MAX   0x7fffffffffffffffLL
+#define ULLONG_MAX  0xffffffffffffffffULL