improve versioning for rwinlib dl

src/Makevars.win

@@ -8,8 +8,9 @@ CXX_STD = CXX11
 
 PKG_CPPFLAGS = -I$(RWINLIB)/include
 
-PKG_LIBS = -L$(RWINLIB)/lib$(BUILD)$(R_ARCH)$(CRT) \
-  -L$(RWINLIB)/lib$(R_ARCH) \
+PKG_LIBS = \
+  -L$(RWINLIB)/lib$(BUILD) \
+  -L$(RWINLIB)/lib$(R_ARCH)$(CRT) \
   $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS) \
   -lmpfr -lgmp -lgmpxx
 
@@ -19,6 +20,6 @@ clean:
 	rm -f $(SHLIB) $(OBJECTS)
 
 winlibs:
-	"${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" "../tools/winlibs.R"
+	"${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" "../tools/winlibs.R" $(VERSION)
 
 .PHONY: all winlibs clean

tools/winlibs.R

@@ -1,12 +1,17 @@
+# Determine GMP version from command line arguments
+VERSION <- commandArgs(TRUE)
+
+# Verify R version validity
 if (getRversion() < "3.3.0") {
   stop("R version too old. On Windows this package requires at least R-3.3")
 }
 
-# Download gmp-6.1.2 from rwinlib
-if (!file.exists("../windows/gmp-6.1.2/include/gmpxx.hpp")) {
+# Download GMP from rwinlib (https://github.com/rwinlib/gmp)
+test_file <- sprintf("../windows/gmp-%s/include/gmpxx.h", VERSION)
+if (!file.exists(test_file)) {
   download.file(
-    "https://github.com/rwinlib/gmp/archive/v6.1.2.zip", "lib.zip",
-    quiet = TRUE)
+    sprintf("https://github.com/rwinlib/gmp/archive/v%s.zip", VERSION),
+    "lib.zip", quiet = TRUE)
   dir.create("../windows", showWarnings = FALSE)
   unzip("lib.zip", exdir = "../windows")
   unlink("lib.zip")