add external dependencies in a pre-built way to avoid incompatibilities

external/include/sodium/export.h

@@ -0,0 +1,57 @@
+
+#ifndef sodium_export_H
+#define sodium_export_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <limits.h>
+
+#if !defined(__clang__) && !defined(__GNUC__)
+# ifdef __attribute__
+#  undef __attribute__
+# endif
+# define __attribute__(a)
+#endif
+
+#ifdef SODIUM_STATIC
+# define SODIUM_EXPORT
+# define SODIUM_EXPORT_WEAK
+#else
+# if defined(_MSC_VER)
+#  ifdef SODIUM_DLL_EXPORT
+#   define SODIUM_EXPORT __declspec(dllexport)
+#  else
+#   define SODIUM_EXPORT __declspec(dllimport)
+#  endif
+# else
+#  if defined(__SUNPRO_C)
+#   ifndef __GNU_C__
+#    define SODIUM_EXPORT __attribute__ (visibility(__global))
+#   else
+#    define SODIUM_EXPORT __attribute__ __global
+#   endif
+#  elif defined(_MSG_VER)
+#   define SODIUM_EXPORT extern __declspec(dllexport)
+#  else
+#   define SODIUM_EXPORT __attribute__ ((visibility ("default")))
+#  endif
+# endif
+# if defined(__ELF__) && !defined(SODIUM_DISABLE_WEAK_FUNCTIONS)
+#  define SODIUM_EXPORT_WEAK SODIUM_EXPORT __attribute__((weak))
+# else
+#  define SODIUM_EXPORT_WEAK SODIUM_EXPORT
+# endif
+#endif
+
+#ifndef CRYPTO_ALIGN
+# if defined(__INTEL_COMPILER) || defined(_MSC_VER)
+#  define CRYPTO_ALIGN(x) __declspec(align(x))
+# else
+#  define CRYPTO_ALIGN(x) __attribute__ ((aligned(x)))
+# endif
+#endif
+
+#define SODIUM_MIN(A, B) ((A) < (B) ? (A) : (B))
+#define SODIUM_SIZE_MAX SODIUM_MIN(UINT64_MAX, SIZE_MAX)
+
+#endif