tcc: early OSX native support

- build scripts
- working '-run' mode, e.g.:

./tcc -B. -I./include -I. -I.. -D_ANSI_SOURCE -run examples/ex1.c

Note: we don't bother parsing Mach-O/Fat images yet. We blindly
dlopen the image.

Signed-off-by: Andrei Warkentin <andrey.warkentin@gmail.com>

Makefile

@@ -36,6 +36,21 @@ ifdef CONFIG_WIN32
  endif
  CFGWIN = -win
  NATIVE_TARGET = $(ARCH)-$(if $(eq $(ARCH),arm),wince,win32)
+else ifdef CONFIG_OSX
+ LIBS=-lm
+ ifndef CONFIG_NOLDL
+  LIBS+=-ldl
+ endif
+ # make libtcc as static or dynamic library?
+ ifeq ($(DISABLE_STATIC),yes)
+  LIBTCC=libtcc.dylib
+  ifndef DISABLE_RPATH
+   LINK_LIBTCC += -Wl,-rpath,"$(libdir)"
+   export LD_LIBRARY_PATH := $(CURDIR)/$(TOP)
+  endif
+ endif
+ CFGWIN =-unx
+ NATIVE_TARGET = $(ARCH)-osx
 else
  LIBS=-lm
  ifndef CONFIG_NOLDL
@@ -72,6 +87,7 @@ CONFIG_$(ARCH) = yes
 NATIVE_DEFINES_$(CONFIG_i386) += -DTCC_TARGET_I386
 NATIVE_DEFINES_$(CONFIG_x86_64) += -DTCC_TARGET_X86_64
 NATIVE_DEFINES_$(CONFIG_WIN32) += -DTCC_TARGET_PE
+NATIVE_DEFINES_$(CONFIG_OSX) += -DTCC_TARGET_X86_64 -DTCC_TARGET_MACHO
 NATIVE_DEFINES_$(CONFIG_uClibc) += -DTCC_UCLIBC
 NATIVE_DEFINES_$(CONFIG_musl) += -DTCC_MUSL
 NATIVE_DEFINES_$(CONFIG_arm) += -DTCC_TARGET_ARM
@@ -92,11 +108,11 @@ TCCDOCS = tcc.1 tcc-doc.html tcc-doc.info
 all: $(PROGS) $(TCCLIBS) $(TCCDOCS)
 
 # cross compiler targets to build
-TCC_X = i386 x86_64 i386-win32 x86_64-win32 arm arm64 arm-wince c67
+TCC_X = i386 x86_64 i386-win32 x86_64-win32 x86_64-osx arm arm64 arm-wince c67
 # TCC_X += arm-fpa arm-fpa-ld arm-vfp arm-eabi
 
 # cross libtcc1.a targets to build
-LIBTCC1_X = i386 x86_64 i386-win32 x86_64-win32 arm arm64 arm-wince
+LIBTCC1_X = i386 x86_64 i386-win32 x86_64-win32 x86_64-osx arm arm64 arm-wince
 
 PROGS_CROSS = $(foreach X,$(TCC_X),$X-tcc$(EXESUF))
 LIBTCC1_CROSS = $(foreach X,$(LIBTCC1_X),libtcc1-$X.a)
@@ -123,6 +139,7 @@ DEF-i386        = -DTCC_TARGET_I386
 DEF-x86_64      = -DTCC_TARGET_X86_64
 DEF-i386-win32  = -DTCC_TARGET_PE -DTCC_TARGET_I386
 DEF-x86_64-win32= -DTCC_TARGET_PE -DTCC_TARGET_X86_64
+DEF-x86_64-osx  = -DTCC_TARGET_MACHO -DTCC_TARGET_X86_64
 DEF-arm-wince   = -DTCC_TARGET_PE -DTCC_TARGET_ARM -DTCC_ARM_EABI -DTCC_ARM_VFP -DTCC_ARM_HARDFLOAT
 DEF-arm64       = -DTCC_TARGET_ARM64
 DEF-c67         = -DTCC_TARGET_C67 -w # disable warnigs
@@ -160,6 +177,7 @@ i386_FILES = $(CORE_FILES) i386-gen.c i386-link.c i386-asm.c i386-asm.h i386-tok
 i386-win32_FILES = $(i386_FILES) tccpe.c
 x86_64_FILES = $(CORE_FILES) x86_64-gen.c x86_64-link.c i386-asm.c x86_64-asm.h
 x86_64-win32_FILES = $(x86_64_FILES) tccpe.c
+x86_64-osx_FILES = $(x86_64_FILES)
 arm_FILES = $(CORE_FILES) arm-gen.c arm-link.c arm-asm.c
 arm-wince_FILES = $(arm_FILES) tccpe.c
 arm64_FILES = $(CORE_FILES) arm64-gen.c arm64-link.c

configure

@@ -37,6 +37,7 @@ cygwin="no"
 gprof="no"
 bigendian="no"
 mingw32="no"
+osx="no"
 LIBSUF=".a"
 EXESUF=""
 DLLSUF=".so"
@@ -52,6 +53,7 @@ cpu=
 # OS specific
 targetos=`uname`
 case $targetos in
+  Darwin)    osx=yes;;
   MINGW*)    mingw32=yes;;
   MSYS*)     mingw32=yes;;
   CYGWIN*)   mingw32=yes; cygwin=yes; cross_prefix="mingw32-";;
@@ -256,6 +258,9 @@ else
     if test x"$tccdir" = x""; then
       tccdir="${libdir}/tcc"
     fi
+    if test "$osx" = "yes" ; then
+	DLLSUF=".dylib"
+    fi
 fi # mingw32
 
 if test x"$includedir" = x""; then
@@ -486,6 +491,9 @@ fi
 if test "$mingw32" = "yes" ; then
   echo "CONFIG_WIN32=yes" >> config.mak
 fi
+if test "$osx" = "yes" ; then
+  echo "CONFIG_OSX=yes" >> config.mak
+fi
 if test "$bigendian" = "yes" ; then
   echo "WORDS_BIGENDIAN=yes" >> config.mak
   echo "#define WORDS_BIGENDIAN 1" >> $TMPH

lib/Makefile

@@ -46,6 +46,9 @@ TGT-i386 = -DTCC_TARGET_I386
 OBJ-x86_64 = $(X86_64_O)
 TGT-x86_64 = -DTCC_TARGET_X86_64
 
+OBJ-x86_64-osx = $(X86_64_O)
+TGT-x86_64-osx = -DTCC_TARGET_X86_64 -DTCC_TARGET_MACHO
+
 OBJ-arm = $(ARM_O)
 TGT-arm = -DTCC_TARGET_ARM
 

libtcc.c

@@ -1081,7 +1081,19 @@ ST_FUNC int tcc_add_file_internal(TCCState *s1, const char *filename, int flags)
             break;
 #endif
         default:
-#ifdef TCC_TARGET_PE
+#if defined(TCC_TARGET_MACHO)
+            if (s1->output_type == TCC_OUTPUT_MEMORY) {
+                ret = 0;
+#ifdef TCC_IS_NATIVE
+                if (NULL == dlopen(filename, RTLD_GLOBAL | RTLD_LAZY)) {
+                    ret = -1;
+                }
+#endif /* TCC_TARGET_MACHO */
+            } else {
+                ret = tcc_load_dll(s1, fd, filename,
+                                   (flags & AFF_REFERENCED_DLL) != 0);
+            }
+#elif defined(TCC_TARGET_PE)
             ret = pe_load_file(s1, filename, fd);
 #else
             /* as GNU ld, consider it is an ld script if not recognized */
@@ -1143,7 +1155,10 @@ ST_FUNC int tcc_add_crt(TCCState *s, const char *filename)
 /* the library name is the same as the argument of the '-l' option */
 LIBTCCAPI int tcc_add_library(TCCState *s, const char *libraryname)
 {
-#ifdef TCC_TARGET_PE
+#if defined(TCC_TARGET_MACHO)
+    const char *libs[] = { "%s/lib%s.dylib", "%s/lib%s.a", NULL };
+    const char **pp = s->static_link ? libs + 1 : libs;
+#elif defined(TCC_TARGET_PE)
     const char *libs[] = { "%s/%s.def", "%s/lib%s.def", "%s/%s.dll", "%s/lib%s.dll", "%s/lib%s.a", NULL };
     const char **pp = s->static_link ? libs + 4 : libs;
 #else