Allow building on MacOS with MacPorts and libgccjit

* configure.ac: Check for the "port" command (MacPorts).
Add the required lib/include directories for nativecomp.

* src/Makefile.in (LIBGCCJIT_CFLAGS, LIBGCCJIT_LIBS): Split into
two parts to allow including -L/-I for MacPorts.
(LIBES): Adjust.
(EMACS_CFLAGS): Ditto.

configure.ac

@@ -1334,6 +1334,9 @@ if test -n "$BREW"; then
     [`$BREW --prefix texinfo 2>/dev/null`/bin$PATH_SEPARATOR$PATH])
 fi
 
+# Check MacPorts on macOS.
+AC_PATH_PROG(HAVE_MACPORTS, port)
+
 ## Require makeinfo >= 4.13 (last of the 4.x series) to build the manuals.
 : ${MAKEINFO:=makeinfo}
 case `($MAKEINFO --version) 2>/dev/null` in
@@ -3807,7 +3810,8 @@ source on this site:
 <https://gcc.gnu.org/wiki/JIT>.])])
 
 HAVE_NATIVE_COMP=no
-LIBGCCJIT_LIB=
+LIBGCCJIT_LIBS=
+LIBGCCJIT_CFLAGS=
 if test "${with_native_compilation}" != "no"; then
     if test "${HAVE_PDUMPER}" = no; then
        AC_MSG_ERROR(['--with-nativecomp' requires '--with-dumping=pdumper'])
@@ -3827,6 +3831,20 @@ if test "${with_native_compilation}" != "no"; then
       fi
     fi
 
+    # Ensure libgccjit installed by MacPorts can be found.
+    if test -n "$HAVE_MACPORTS"; then
+      # Determine which gcc version has been installed (gcc11, for
+      # instance).
+      PORT_PACKAGE=$(port installed active | grep '^ *gcc@<:@0-9@:>@* ' | \
+                          awk '{ print $1; }')
+      MACPORTS_LIBGCCJIT_INCLUDE=$(dirname $(port contents $PORT_PACKAGE | \
+                                           grep libgccjit.h))
+      MACPORTS_LIBGCCJIT_LIB=$(dirname $(port contents $PORT_PACKAGE | \
+                                              grep libgccjit.dylib))
+      CFLAGS="$CFLAGS -I${MACPORTS_LIBGCCJIT_INCLUDE}"
+      LDFLAGS="$LDFLAGS -L${MACPORTS_LIBGCCJIT_LIB}"
+    fi
+
     # Check if libgccjit is available.
     AC_CHECK_LIB(gccjit, gcc_jit_context_acquire, [], [libgccjit_not_found])
     AC_CHECK_HEADERS(libgccjit.h, [], [libgccjit_dev_not_found])
@@ -3841,17 +3859,24 @@ if test "${with_native_compilation}" != "no"; then
       mingw32) ;;
       # OpenBSD doesn't have libdl, all the functions are in libc
       netbsd|openbsd)
-        LIBGCCJIT_LIB="-lgccjit" ;;
+        LIBGCCJIT_LIBS="-lgccjit" ;;
       *)
-        LIBGCCJIT_LIB="-lgccjit -ldl" ;;
+        LIBGCCJIT_LIBS="-lgccjit -ldl" ;;
     esac
     NEED_DYNLIB=yes
     AC_DEFINE(HAVE_NATIVE_COMP, 1, [Define to 1 if native compiler is available.])
+
+    # Ensure libgccjit installed by MacPorts can be found.
+    if test -n "$HAVE_MACPORTS"; then
+      LIBGCCJIT_CFLAGS="$LIBGCCJIT_CFLAGS  -I${MACPORTS_LIBGCCJIT_INCLUDE}"
+      LIBGCCJIT_LIBS="-L${MACPORTS_LIBGCCJIT_LIB} $LIBGCCJIT_LIBS"
+    fi
 fi
 AC_DEFINE_UNQUOTED(NATIVE_ELISP_SUFFIX, ".eln",
   [System extension for native compiled elisp])
 AC_SUBST(HAVE_NATIVE_COMP)
-AC_SUBST(LIBGCCJIT_LIB)
+AC_SUBST(LIBGCCJIT_CFLAGS)
+AC_SUBST(LIBGCCJIT_LIBS)
 
 DYNLIB_OBJ=
 if test "${NEED_DYNLIB}" = yes; then

src/Makefile.in

@@ -326,7 +326,8 @@ GETLOADAVG_LIBS = @GETLOADAVG_LIBS@
 
 LIBGMP = @LIBGMP@
 
-LIBGCCJIT = @LIBGCCJIT_LIB@
+LIBGCCJIT_LIBS = @LIBGCCJIT_LIBS@
+LIBGCCJIT_CFLAGS = @LIBGCCJIT_CFLAGS@
 
 ## dynlib.o if necessary, else empty
 DYNLIB_OBJ = @DYNLIB_OBJ@
@@ -367,7 +368,7 @@ EMACS_CFLAGS=-Demacs $(MYCPPFLAGS) -I. -I$(srcdir) \
   -I$(lib) -I$(top_srcdir)/lib \
   $(C_SWITCH_MACHINE) $(C_SWITCH_SYSTEM) $(C_SWITCH_X_SITE) \
   $(GNUSTEP_CFLAGS) $(CFLAGS_SOUND) $(RSVG_CFLAGS) $(IMAGEMAGICK_CFLAGS) \
-  $(PNG_CFLAGS) $(LIBXML2_CFLAGS) $(DBUS_CFLAGS) \
+  $(PNG_CFLAGS) $(LIBXML2_CFLAGS) $(LIBGCCJIT_CFLAGS) $(DBUS_CFLAGS) \
   $(XRANDR_CFLAGS) $(XINERAMA_CFLAGS) $(XFIXES_CFLAGS) $(XDBE_CFLAGS) \
   $(WEBKIT_CFLAGS) $(LCMS2_CFLAGS) \
   $(SETTINGS_CFLAGS) $(FREETYPE_CFLAGS) $(FONTCONFIG_CFLAGS) \
@@ -516,7 +517,7 @@ LIBES = $(LIBS) $(W32_LIBS) $(LIBS_GNUSTEP) $(LIBX_BASE) $(LIBIMAGE) \
    $(FREETYPE_LIBS) $(FONTCONFIG_LIBS) $(HARFBUZZ_LIBS) $(LIBOTF_LIBS) $(M17N_FLT_LIBS) \
    $(LIBGNUTLS_LIBS) $(LIB_PTHREAD) $(GETADDRINFO_A_LIBS) $(LCMS2_LIBS) \
    $(NOTIFY_LIBS) $(LIB_MATH) $(LIBZ) $(LIBMODULES) $(LIBSYSTEMD_LIBS) \
-   $(JSON_LIBS) $(LIBGMP) $(LIBGCCJIT)
+   $(JSON_LIBS) $(LIBGMP) $(LIBGCCJIT_LIBS)
 
 ## FORCE it so that admin/unidata can decide whether this file is
 ## up-to-date.  Although since charprop depends on bootstrap-emacs,