Auto-detect platform in makefiles and test runner

Use uname -s to select Linux vs macOS build flags instead of
hardcoding. Add -undefined dynamic_lookup for test shared libs
on macOS. Set _port=true automatically on non-Linux in ./all.

all

@@ -2,7 +2,11 @@ make -s -j
 cd testes/libs; make -s
 cd ..     # back to directory 'testes'
 ulimit -S -s 1100
-if { ../lua -W all.lua; } then
+LUA_FLAGS="-W"
+if [ "$(uname)" != "Linux" ]; then
+  LUA_FLAGS="$LUA_FLAGS -e_port=true"
+fi
+if { ../lua $LUA_FLAGS all.lua; } then
   echo -e "\n\n    final OK!!!!\n\n"
 else
   echo -e "\n\n    >>>> BUG!!!!\n\n"

makefile

@@ -71,9 +71,18 @@ LOCAL = $(TESTS) $(CWARNS)
 # To enable Linux goodies, -DLUA_USE_LINUX
 # For C89, "-std=c89 -DLUA_USE_C89"
 # Note that Linux/Posix options are not compatible with C89
+#
+# Platform detection
+UNAME= $(shell uname -s)
+ifeq ($(UNAME),Darwin)
+MYCFLAGS= $(LOCAL) -std=c99 -DLUA_USE_MACOSX
+MYLDFLAGS=
+MYLIBS=
+else
 MYCFLAGS= $(LOCAL) -std=c99 -DLUA_USE_LINUX
 MYLDFLAGS= -Wl,-E
 MYLIBS= -ldl
+endif
 
 
 CC= gcc
@@ -95,7 +104,7 @@ CORE_O=	lapi.o lcode.o lctype.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o \
 	ltm.o lundump.o lvm.o lzio.o ltests.o
 AUX_O=	lauxlib.o
 LIB_O=	lbaselib.o ldblib.o liolib.o lmathlib.o loslib.o ltablib.o lstrlib.o \
-	lutf8lib.o loadlib.o lcorolib.o linit.o
+	lutf8lib.o loadlib.o lcorolib.o lcmd.o linit.o
 
 LUA_T=	lua
 LUA_O=	lua.o
@@ -148,6 +157,7 @@ lapi.o: lapi.c lprefix.h lua.h luaconf.h lapi.h llimits.h lstate.h \
 lauxlib.o: lauxlib.c lprefix.h lua.h luaconf.h lauxlib.h llimits.h
 lbaselib.o: lbaselib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h \
  llimits.h
+lcmd.o: lcmd.c lprefix.h lua.h luaconf.h lauxlib.h lcmd.h
 lcode.o: lcode.c lprefix.h lua.h luaconf.h lcode.h llex.h lobject.h \
  llimits.h lzio.h lmem.h lopcodes.h lparser.h ldebug.h lstate.h ltm.h \
  ldo.h lgc.h lstring.h ltable.h lvm.h lopnames.h
@@ -167,7 +177,7 @@ lfunc.o: lfunc.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \
  llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h
 lgc.o: lgc.c lprefix.h lua.h luaconf.h ldebug.h lstate.h lobject.h \
  llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h lstring.h ltable.h
-linit.o: linit.c lprefix.h lua.h luaconf.h lualib.h lauxlib.h llimits.h
+linit.o: linit.c lprefix.h lua.h luaconf.h lualib.h lauxlib.h llimits.h lcmd.h
 liolib.o: liolib.c lprefix.h lua.h luaconf.h lauxlib.h lualib.h llimits.h
 llex.o: llex.c lprefix.h lua.h luaconf.h lctype.h llimits.h ldebug.h \
  lstate.h lobject.h ltm.h lzio.h lmem.h ldo.h lgc.h llex.h lparser.h \

testes/libs/makefile

@@ -6,6 +6,10 @@ CC = gcc
 
 # compilation should generate Dynamic-Link Libraries
 CFLAGS = -Wall -O2 -I$(LUA_DIR) -fPIC -shared
+UNAME = $(shell uname -s)
+ifeq ($(UNAME),Darwin)
+CFLAGS += -undefined dynamic_lookup
+endif
 
 # libraries used by the tests
 all: lib1.so lib11.so lib2.so lib21.so lib2-v2.so