Support MacOS

- Check for clock_settime before using it
- use __fenv_feenableexcept() from flt_env.c instead of feenableexcept() since it doesn't exist on macOS
- Use POSIX limits.h
- no rt for macos
- Enable macos support
- don't declare bzero() as it's likely a macro
- Remove bad strcpy declaration

Author: isuruf

CMakeLists.txt

@@ -30,6 +30,9 @@ endif()
 if( ${TARGET_OS} STREQUAL "Linux" )
   set(OS "LINUX")
   set(OSNAME "Linux")
+elseif( ${TARGET_OS} STREQUAL "Darwin" )
+  set(OS "OSX")
+  set(OSNAME "macOS")
 else()
   message("Unsupported OS: ${TARGET_OS}" )
   return()

runtime/flang/CMakeLists.txt

@@ -19,6 +19,10 @@ endif ()
 # flang* executables
 SET(CMAKE_Fortran_FLAGS "-B ${LLVM_RUNTIME_OUTPUT_INTDIR} ${CMAKE_Fortran_FLAGS}")
 
+include(CheckSymbolExists)
+check_symbol_exists(clock_settime "time.h" HAVE_CLOCK_SETTIME)
+configure_file(libflang_config.h.in libflang_config.h)
+
 SET(FTN_INTRINSICS_DESC_INDEP
   abort3f.c
   access3f.c
@@ -508,10 +512,12 @@ add_dependencies(flang_shared flang_static)
 
 target_link_libraries(flang_shared flangrti_shared)
 # Resolve symbols against libm and librt
-if (NOT MSVC)
-  target_link_libraries(flang_shared m rt)
-else()
+if (MSVC)
   set_target_properties(flang_shared PROPERTIES WINDOWS_EXPORT_ALL_SYMBOLS TRUE)
+elseif (APPLE)
+  target_link_libraries(flang_shared m)
+else()
+  target_link_libraries(flang_shared m rt)
 endif()
 
 set(SHARED_LIBRARY FALSE)

runtime/flang/global.h

@@ -81,7 +81,6 @@ typedef char sbool; /* short boolean (for use in large structs) */
 #define assert(ex)
 #endif
 
-extern char *strcpy();
 #define STASH(str) (strcpy((char *)malloc(strlen(str) + 1), str))
 
 /* defs used by __fortio_error */

runtime/flang/libflang_config.h.in

@@ -0,0 +1,4 @@
+#ifndef LIBFLANG_CONFIG_H
+#define LIBFLANG_CONFIG_H
+#cmakedefine HAVE_CLOCK_SETTIME
+#endif

runtime/flang/stime3f.c

@@ -9,12 +9,13 @@
 
 /*	stime3f.c - Implements LIB3F stime subprogram.  */
 
-#ifndef WINNT
-
+#include "libflang_config.h"
 #include <time.h>
 #include "io3f.h"
 #include "ent3f.h"
 
+#ifdef HAVE_CLOCK_SETTIME
+
 int ENT3F(STIME, stime)(int *tp)
 {
   int i;
@@ -27,4 +28,4 @@ int ENT3F(STIME, stime)(int *tp)
   return i;
 }
 
-#endif /* !WINNT */
+#endif /* HAVE_CLOCK_SETTIME */

runtime/flangrti/ktrap.c

@@ -50,7 +50,11 @@ __ktrap(void)
         excepts |= FE_UNDERFLOW;
       if (bv & 0x100)
         excepts |= FE_INEXACT;
+#ifdef TARGET_OSX
+      __fenv_feenableexcept(excepts);
+#else
       feenableexcept(excepts);  /* glibc 2.2 extension to fenv.h */
+#endif
     }
   }
 }

runtime/flangrti/trace_lin.c

@@ -13,7 +13,7 @@
 #else
 #include <execinfo.h>
 #include <unistd.h>
-#include <linux/limits.h>
+#include <limits.h>
 #include <sys/types.h>
 #endif
 #include <stdioInterf.h>

tools/flang1/flang1exe/gbldefs.h

@@ -162,7 +162,6 @@ char *mkfname(const char *, const char *, const char *); /* from miscutil.c: */
 bool is_xflag_bit(int);
 void set_xflag(int, INT);
 void set_yflag(int, INT);
-void bzero(void *, size_t);
 void list_init(FILE *); /* listing.c: */
 void list_line(const char *); /* listing.c */
 void list_page(void);   /* listing.c */