Move getMemory implementation so we can statically link bdwgc

Also:
* Remove the requirement that we build a shared bdwgc library in
  autotools
* Update the check for GC_get_full_gc_total_time.  ifndef was the
  wrong thing to use since it's not a macro.  We were *always* declaring
  it, which wasn't a problem unless we were statically linking bdwgc.
  Then we got redefinition errors.

Author: d-torrance

M2/Macaulay2/d/actors5.d

@@ -2111,7 +2111,8 @@ toExternalString(e:Expr):Expr := (
 setupfun("toExternalString0",toExternalString);
 
 header "
-#ifndef GC_get_full_gc_total_time /* added in bdwgc 8 */
+/* added in bdwgc 8 */
+#if GC_VERSION_MAJOR < 8
 unsigned long GC_get_full_gc_total_time(void) {return 0;}
 #endif
 #define DEF_GC_FN0(s)	static void * s##_0(void *client_data) { (void) client_data; return (void *) (long) s(); }

M2/Macaulay2/d/ffi.d

@@ -679,3 +679,19 @@ ffiFunctionPointerAddress(e:Expr):Expr := (
 	else WrongArg(1, "a function"))
     else WrongNumArgs(2));
 setupfun("ffiFunctionPointerAddress", ffiFunctionPointerAddress);
+
+getMemory0(e:Expr):Expr := (
+    when e
+    is a:Sequence
+    do (
+	when a.0
+	is n:ZZcell do (
+	    if !isInt(n) then WrongArgSmallInteger(1)
+	    else when a.1
+	    is atomic:Boolean do (
+		if atomic.v then toExpr(getMemAtomic(toInt(n.v)))
+		else toExpr(getMem(toInt(n.v))))
+	    else WrongArgBoolean(2))
+	else WrongArgZZ(1))
+    else WrongNumArgs(2));
+setupfun("getMemory0", getMemory0);

M2/Macaulay2/packages/ForeignFunctions.m2

@@ -19,7 +19,7 @@
 newPackage("ForeignFunctions",
     Headline => "foreign function interface",
     Version => "0.5",
-    Date => "March 7, 2025",
+    Date => "March 8, 2025",
     Authors => {{
 	    Name => "Doug Torrance",
 	    Email => "[email protected]",
@@ -33,8 +33,9 @@ newPackage("ForeignFunctions",
 
 -*
 
-0.5 (2025-03-07, M2 1.25.05)
+0.5 (2025-03-08, M2 1.25.05)
 * make LAPACK example canned since it may be a static library
+* move getMemory implementation to ffi.d so we can link bdwgc statically
 
 0.4 (2024-10-01, M2 1.24.11)
 * remove redundant Constant methods now that it's a subclass of Number
@@ -153,6 +154,7 @@ importFrom_Core {
     "ffiStructAddress",
     "ffiUnionType",
     "ffiFunctionPointerAddress",
+    "getMemory0",
     "registerFinalizerForPointer",
     "toExternalFormat"
     }
@@ -671,13 +673,10 @@ foreignSymbol(String, ForeignType) := (symb, T) -> dereference_T dlsym symb
 -- working with pointers --
 ---------------------------
 
-gcMalloc = foreignFunction("GC_malloc", voidstar, ulong)
-gcMallocAtomic = foreignFunction("GC_malloc_atomic", voidstar, ulong)
-
 getMemory = method(Options => {Atomic => false}, TypicalValue => voidstar)
 getMemory ZZ := o -> n -> (
-    if n <= 0 then error "expected positive number";
-    (if o.Atomic then gcMallocAtomic else gcMalloc) n)
+    if n <= 0 then error "expected positive number"
+    else voidstar getMemory0(n, o.Atomic))
 getMemory ForeignType := o -> T -> getMemory(size T, Atomic => isAtomic T)
 getMemory ForeignVoidType := o -> T -> error "can't allocate a void"
 

M2/libraries/gc/Makefile.in

@@ -6,7 +6,6 @@ GITURL = https://github.com/ivmai/bdwgc/
 VERSION = 8.2.8
 LICENSEFILES = README.QUICK
 # PATCHFILE = @abs_srcdir@/patch-$(VERSION)
-SHARED = yes			# the foreign functions package needs this
 PRECONFIGURE = ./autogen.sh
 
 # We can also get the sources from the home page above or from
@@ -59,7 +58,7 @@ CONFIGOPTIONS += --enable-threads=posix
 ## always build for large memory configurations
 CPPFLAGS += -DMAX_HEAP_SECTS=81920 -DMAXHINCR=4096
 
-ifeq (@SHARED@-SHARED,no-no)
+ifeq (@SHARED@,no)
 CONFIGOPTIONS += --disable-shared --enable-static
 endif