Add support for CYGWIN.

contrib/curl/lib/config-linux.h

@@ -185,7 +185,7 @@
 #define HAVE_GETHOSTBYNAME 1
 
 /* Define to 1 if you have the gethostbyname_r function. */
-#if !defined(__OpenBSD__) && !defined(__NetBSD__) && !defined(__sun__)
+#if !defined(__OpenBSD__) && !defined(__NetBSD__) && !defined(__sun__) && !defined(__CYGWIN__)
 #define HAVE_GETHOSTBYNAME_R 1
 #endif
 

contrib/curl/lib/curl_setup.h

@@ -170,6 +170,10 @@
 #  include "config-linux.h"
 #endif
 
+#ifdef __CYGWIN__
+#  include "config-linux.h"
+#endif
+
 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
 #  include "config-linux.h"
 #endif

contrib/lua/premake5.lua

@@ -18,7 +18,7 @@ project "lua-lib"
 		"src/print.c",
 	}
 
-	filter "system:linux or bsd or hurd or aix or solaris or haiku"
+	filter "system:linux or bsd or hurd or aix or solaris or haiku or cygwin"
 		defines     { "LUA_USE_POSIX", "LUA_USE_DLOPEN" }
 
 	filter "system:macosx"

contrib/lua/src/luaconf.h

@@ -198,6 +198,18 @@
 		LUA_CDIR"..\\lib\\lua\\" LUA_VDIR "\\?.dll;" \
 		LUA_CDIR"loadall.dll;" ".\\?.dll"
 
+#elif defined(__CYGWIN__)		/* }{ */
+
+#define LUA_ROOT	"/usr/"
+#define LUA_LDIR	LUA_ROOT "share/lua/" LUA_VDIR "/"
+#define LUA_CDIR	LUA_ROOT "lib/lua/" LUA_VDIR "/"
+#define LUA_PATH_DEFAULT  \
+		LUA_LDIR"?.lua;"  LUA_LDIR"?/init.lua;" \
+		LUA_CDIR"?.lua;"  LUA_CDIR"?/init.lua;" \
+		"./?.lua;" "./?/init.lua"
+#define LUA_CPATH_DEFAULT \
+		LUA_CDIR"?.dll;" LUA_CDIR"loadall.dll;" "./?.dll"
+
 #else			/* }{ */
 
 #define LUA_ROOT	"/usr/local/"

contrib/luashim/premake5.lua

@@ -13,7 +13,7 @@ project "luashim-lib"
 		"*.lua"
 	}
 
-	filter "system:linux or bsd or hurd or aix or haiku"
+	filter "system:linux or bsd or hurd or aix or haiku or cygwin"
 		defines      { "LUA_USE_POSIX", "LUA_USE_DLOPEN" }
 
 	filter "system:macosx"

premake4.lua

@@ -77,7 +77,7 @@
 		configuration { "solaris" }
 			links       { "m", "socket", "nsl" }
 
-		configuration "aix"
+		configuration "aix or cygwin"
 			defines     { "LUA_USE_POSIX", "LUA_USE_DLOPEN" }
 			links       { "m" }
 

premake5.lua

@@ -386,7 +386,7 @@
 		filter { "system:solaris" }
 			links       { "m", "socket", "nsl" }
 
-		filter "system:aix"
+		filter "system:aix or cygwin"
 			defines     { "LUA_USE_POSIX", "LUA_USE_DLOPEN" }
 			links       { "m" }
 

src/_premake_init.lua

@@ -861,6 +861,7 @@
 		allowed = {
 			"aix",
 			"bsd",
+			"cygwin",
 			"emscripten",
 			"haiku",
 			"hurd",
@@ -1606,6 +1607,7 @@
 		allowed = {
 			{ "aix",        "IBM AIX" },
 			{ "bsd",        "OpenBSD, NetBSD, or FreeBSD" },
+			{ "cygwin",     "CYGWIN" },
 			{ "emscripten", "Emscripten" },
 			{ "haiku",      "Haiku" },
 			{ "hurd",       "GNU/Hurd" },
@@ -1725,6 +1727,16 @@
 		targetprefix ""
 		targetbundleextension ".xctest"
 
+	-- CYGWIN specific.
+
+	filter { "system:cygwin", "kind:ConsoleApp or WindowedApp" }
+		targetextension ".exe"
+
+	filter { "system:cygwin", "kind:SharedLib" }
+		targetprefix "cyg"
+		targetextension ".dll"
+		implibextension ".dll.a"
+
 	-- Windows and friends.
 
 	filter { "system:Windows or language:C# or language:F#", "kind:ConsoleApp or WindowedApp" }
@@ -1744,7 +1756,7 @@
 		targetextension ".dll"
 		implibextension ".dll"
 
-	filter { "kind:SharedLib", "system:not Windows" }
+	filter { "kind:SharedLib", "system:not Windows and not cygwin" }
 		pic "On"
 
 	filter { "system:darwin" }

src/base/os.lua

@@ -65,6 +65,8 @@
 	local function get_library_search_path()
 		if os.istarget("windows") then
 			return (os.getenv("PATH") or ""):explode(";")
+		elseif os.istarget("cygwin") then
+			return (os.getenv("PATH") or ""):explode(":")
 		elseif os.istarget("haiku") then
 			return (os.getenv("LIBRARY_PATH") or ""):explode(":")
 		else
@@ -84,7 +86,7 @@
 
 			local archpaths = {"/lib", "/usr/lib", "/usr/local/lib"}
 			if os.is64bit() and not (os.istarget("darwin")) then
-				archpaths = table.join({"/lib64", "/usr/lib64/", "usr/local/lib64"}, archpaths)
+				archpaths = table.join({"/lib64", "/usr/lib64", "usr/local/lib64"}, archpaths)
 			end
 			return table.join(paths, archpaths)
 		end
@@ -116,6 +118,8 @@
 		-- assemble a search path, depending on the platform
 		if os.istarget("windows") then
 			formats = { "%s.dll", "%s" }
+		elseif os.istarget("cygwin") then
+			formats = { "cyg%s.dll", "%s.dll", "%s" }
 		elseif os.istarget("haiku") then
 			formats = { "lib%s.so", "%s.so" }
 		else
@@ -868,6 +872,7 @@
 		["aix"]        = { "aix",     "posix", "desktop" },
 		["android"]    = { "android", "mobile" },
 		["bsd"]        = { "bsd",     "posix", "desktop" },
+		["cygwin"]     = { "cygwin",  "posix", "desktop" },
 		["emscripten"] = { "emscripten", "web" },
 		["haiku"]      = { "haiku",   "posix", "desktop" },
 		["ios"]        = { "ios",     "darwin", "posix", "mobile" },

src/host/os_getnumcpus.c

@@ -16,14 +16,15 @@
 #include <sys/sysctl.h>
 #elif PLATFORM_SOLARIS
 #include <unistd.h>
-#elif PLATFORM_WINDOWS
+#elif PLATFORM_WINDOWS | PLATFORM_CYGWIN
 #define WIN32_LEAN_AND_MEAN
+#define NOGDI
 #include <windows.h>
 #endif
 
 int do_getnumcpus()
 {
-#if PLATFORM_WINDOWS
+#if PLATFORM_WINDOWS | PLATFORM_CYGWIN
 	SYSTEM_INFO sysinfo;
 	GetSystemInfo(&sysinfo);
 	return sysinfo.dwNumberOfProcessors;

src/host/os_getversion.c

@@ -272,7 +272,7 @@ int getversion(struct OsVersionInfo* info)
 
 /*************************************************************/
 
-#elif defined(PLATFORM_BSD) || defined(PLATFORM_LINUX) || defined(PLATFORM_SOLARIS) || defined(PLATFORM_HURD) || defined(PLATFORM_HAIKU) || defined(PLATFORM_COSMO)
+#elif defined(PLATFORM_BSD) || defined(PLATFORM_LINUX) || defined(PLATFORM_SOLARIS) || defined(PLATFORM_HURD) || defined(PLATFORM_HAIKU) || defined(PLATFORM_COSMO) || defined(__CYGWIN__)
 
 #include <string.h>
 #include <sys/utsname.h>

src/host/premake.h

@@ -52,11 +52,14 @@
 #elif defined(_WIN32) || defined(_WIN64)
 #define PLATFORM_WINDOWS  (1)
 #define PLATFORM_OS   "windows"
+#elif defined (__CYGWIN__)
+#define PLATFORM_CYGWIN  (1)
+#define PLATFORM_OS  "cygwin"
 #else
 #error Unknown platform detected
 #endif
 
-#define PLATFORM_POSIX  (PLATFORM_LINUX || PLATFORM_BSD || PLATFORM_MACOSX || PLATFORM_SOLARIS || PLATFORM_HAIKU || PLATFORM_HURD || PLATFORM_COSMO)
+#define PLATFORM_POSIX  (PLATFORM_LINUX || PLATFORM_BSD || PLATFORM_MACOSX || PLATFORM_SOLARIS || PLATFORM_HAIKU || PLATFORM_HURD || PLATFORM_COSMO || PLATFORM_CYGWIN)
 
 #if defined(__x86_64__) || defined(__x86_64) || defined(__amd64__) || defined(__amd64) || \
     defined(_M_X64) || defined(_M_AMD64)

tests/base/test_os.lua

@@ -22,7 +22,7 @@
 	end
 
 	local function get_LD_PATH_variable_name()
-		if os.istarget("windows") then
+		if os.istarget("windows") or os.istarget("cygwin") then
 			return 'PATH'
 		elseif os.istarget("haiku") then
 			return 'LIBRARY_PATH'
@@ -51,6 +51,8 @@
 			-- https://developer.apple.com/documentation/macos-release-notes/macos-big-sur-11_0_1-release-notes
 		elseif os.istarget("windows") then
 			test.istrue(os.findlib("user32"))
+		elseif os.istarget("cygwin") then
+			test.istrue(os.findlib("cygwin1"))
 		elseif os.istarget("haiku") then
 			test.istrue(os.findlib("root"))
 		elseif os.istarget("bsd") and os.getversion().description == "OpenBSD" then

website/docs/system.md

@@ -15,6 +15,7 @@ If no system is specified, Premake will identify and target the current operatin
 | aix | IBM AIX |
 | android | Android Platform |
 | bsd | BSD Variants |
+| cygwin | CYGWIN |
 | emscripten | Emscripten targets |
 | haiku | Haiku OS |
 | hurd | GNU Hurd |