From ca26a3de870e281b15c16363dcdb0d63450b0d51 Mon Sep 17 00:00:00 2001
From: Joao Matos <joao@tritao.eu>
Date: Thu, 3 Oct 2024 23:11:42 +0100
Subject: [PATCH 1/2] Fix `os.host` for Cosmopolitan build.

---
 src/host/os_host.c     | 24 +++++++++++++++++++++++-
 src/host/premake.c     | 22 ----------------------
 tests/base/test_os.lua | 14 ++++++++++++++
 3 files changed, 37 insertions(+), 23 deletions(-)

diff --git a/src/host/os_host.c b/src/host/os_host.c
index ce6b6c697..cde59d647 100644
--- a/src/host/os_host.c
+++ b/src/host/os_host.c
@@ -6,8 +6,30 @@
 
 #include "premake.h"
 
+#if PLATFORM_COSMO
+#include <cosmo.h>
+#include <assert.h>
+#endif
+
+static const char* host_os()
+{
+#if PLATFORM_COSMO
+	if (IsLinux()) { return "linux"; }
+	else if (IsWindows()) { return "windows"; }
+	else if (IsXnu()) { return "macosx"; }
+	else if (IsBsd()) { return "bsd"; }
+	else
+	{
+		assert(0 && "Platform is unknown to Cosmopolitan Libc");
+		return 0;
+	}
+#else
+	return PLATFORM_OS;
+#endif
+}
+
 int os_host(lua_State* L)
 {
-	lua_pushstring(L, PLATFORM_OS);
+	lua_pushstring(L, host_os());
 	return 1;
 }
diff --git a/src/host/premake.c b/src/host/premake.c
index 44f4761c9..f6fd47e8c 100644
--- a/src/host/premake.c
+++ b/src/host/premake.c
@@ -20,10 +20,6 @@
 #include <sys/sysctl.h>
 #endif
 
-#if PLATFORM_COSMO
-#include <cosmo.h>
-#endif
-
 #define ERROR_MESSAGE  "Error: %s\n"
 
 
@@ -177,24 +173,6 @@ void luaL_register(lua_State *L, const char *libname, const luaL_Reg *l)
 }
 
 
-static const char* premake_host_os()
-{
-#if PLATFORM_COSMO
-	if (IsLinux()) { return "linux"; }
-	else if (IsWindows()) { return "windows"; }
-	else if (IsXnu()) { return "macosx"; }
-	else if (IsBsd()) { return "bsd"; }
-	else
-	{
-		assert(0 && "Platform is unknown to Cosmopolitan Libc");
-		return 0;
-	}
-#else
-	return PLATFORM_OS;
-#endif
-}
-
-
 /**
  * Initialize the Premake Lua environment.
  */
diff --git a/tests/base/test_os.lua b/tests/base/test_os.lua
index bfa424d3f..df59da31b 100644
--- a/tests/base/test_os.lua
+++ b/tests/base/test_os.lua
@@ -500,6 +500,20 @@
 	end
 
 
+--
+-- os.host() tests.
+--
+
+function suite.host()
+	local host = os.host()
+	test.istrue(string.len(host) > 0)
+
+	if _COSMOPOLITAN then
+		test.istrue(host ~= "cosmopolitan")
+	end
+end
+
+
 --
 -- os.hostarch() tests.
 --

From db2a83210726fed72fe4ef4168c3e3a22b61de65 Mon Sep 17 00:00:00 2001
From: Joao Matos <joao@tritao.eu>
Date: Thu, 3 Oct 2024 23:12:09 +0100
Subject: [PATCH 2/2] Move `_TARGET_OS` to Lua.

---
 src/_premake_main.lua | 5 ++++-
 src/host/premake.c    | 8 --------
 2 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/src/_premake_main.lua b/src/_premake_main.lua
index 3dcd33625..0be4153e1 100644
--- a/src/_premake_main.lua
+++ b/src/_premake_main.lua
@@ -8,9 +8,12 @@
 	local versionhelp   = "premake5 (Premake Build Script Generator) %s"
 	local startTime     = os.clock()
 
--- set a global.
+-- set main globals.
 	_PREMAKE_STARTTIME = startTime
 
+	-- default the target OS to the host OS
+	_TARGET_OS = os.host()
+
 -- Load the collection of core scripts, required for everything else to work
 
 	local modules = dofile("_modules.lua")
diff --git a/src/host/premake.c b/src/host/premake.c
index f6fd47e8c..042ac35d0 100644
--- a/src/host/premake.c
+++ b/src/host/premake.c
@@ -213,14 +213,6 @@ int premake_init(lua_State* L)
 	lua_pushstring(L, PREMAKE_PROJECT_URL);
 	lua_setglobal(L, "_PREMAKE_URL");
 
-	/* set the target OS platform variable */
-	lua_pushstring(L, premake_host_os());
-	lua_setglobal(L, "_TARGET_OS");
-
-	/* set the target arch platform variable */
-	lua_pushnil(L);
-	lua_setglobal(L, "_TARGET_ARCH");
-
 #if PLATFORM_COSMO
 	/* set _COSMOPOLITAN if its a Cosmopolitan build */
 	lua_pushboolean(L, TRUE);