maybe work on R 4.2/4/1

configure.win

@@ -1,6 +1,16 @@
 
 if pkg-config absl_base --libs 2>/dev/null; then
-  exit 0;
+  echo "Using Abseil from RTools via pkg-config"
+else
+  WIN_CPPFLAGS="-DABSL_FORCE_WAITER_MODE=4" tools/build_absl.sh
 fi
 
-WIN_CPPFLAGS="-DABSL_FORCE_WAITER_MODE=4" tools/build_absl.sh
+if pkg-config openssl --libs 2>/dev/null; then
+  echo "Using openssl from RTools via pkg-config"
+else
+  "${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" "../tools/winlibs.R"
+fi
+
+
+
+

src/Makevars.win

@@ -1,4 +1,7 @@
 
+# Configure Abseil. If it wasn't available via pkg-config, it was built
+# by cmake in configure.win.
+
 ABSL_LIBS = -labsl_cord -labsl_cordz_info -labsl_cord_internal -labsl_cordz_functions -labsl_cordz_handle -labsl_crc_cord_state -labsl_crc32c -labsl_crc_internal -labsl_crc_cpu_detect -labsl_raw_hash_set -labsl_hashtablez_sampler -labsl_exponential_biased -labsl_synchronization -labsl_graphcycles_internal -labsl_kernel_timeout_internal -labsl_stacktrace -labsl_symbolize -labsl_malloc_internal -labsl_time -labsl_civil_time -labsl_time_zone -labsl_hash -labsl_city -labsl_bad_optional_access -labsl_bad_variant_access -labsl_low_level_hash -labsl_str_format_internal -labsl_strings -labsl_string_view -labsl_strings_internal -labsl_int128 -labsl_throw_delegate -labsl_demangle_internal -labsl_base -labsl_spinlock_wait -labsl_debugging_internal -labsl_raw_logging_internal -labsl_log_severity
 
 ifeq (,$(shell pkg-config absl_base --libs 2>/dev/null))
@@ -8,13 +11,19 @@ else
   ABSL_LIB_FLAGS = $(ABSL_LIBS)
 endif
 
+
+# Configure openssl and finalize PKG_LIBS. If openssl is not available via
+# pkg-config, it was downloaded from rwinlibs in configure.win.
 ifeq (,$(shell pkg-config openssl --libs 2>/dev/null))
-  PKG_LIBS = -Ls2 -ls2static $(ABSL_LIB_FLAGS) -lssl -lcrypto -lz -lws2_32 -lgdi32 -lcrypt32
+  OPENSSL_CFLAGS = -I../windows/openssl-$(VERSION)/include
+  OPENSSL_LIB_FLAGS = -L../windows/openssl/lib -lssl -lcrypto -lz -lws2_32 -lgdi32 -lcrypt32
 else
-  PKG_LIBS = -Ls2 -ls2static $(ABSL_LIB_FLAGS) $(shell pkg-config --libs openssl)
+  OPENSSL_CFLAGS =
+  OPENSSL_LIB_FLAGS = $(shell pkg-config --libs openssl)
 endif
 
-PKG_CPPFLAGS = $(ABSL_CFLAGS) -DSTRICT_R_HEADERS -DS2_USE_EXACTFLOAT -D_USE_MATH_DEFINES -DNDEBUG -DIS_LITTLE_ENDIAN -DOMIT_STRPTIME -I../src
+PKG_CPPFLAGS = $(ABSL_CFLAGS) $(OPENSSL_CFLAGS) -DSTRICT_R_HEADERS -DS2_USE_EXACTFLOAT -D_USE_MATH_DEFINES -DNDEBUG -DIS_LITTLE_ENDIAN -DOMIT_STRPTIME -I../src
+PKG_LIBS = -Ls2 -ls2static $(ABSL_LIB_FLAGS) $(OPENSSL_LIB_FLAGS)
 
 CXX_STD = CXX17
 

tools/winlibs.R

@@ -1,10 +1,27 @@
-# Build against mingw-w64 build of openssl
-VERSION <- commandArgs(TRUE)
-if(!file.exists(sprintf("../windows/openssl-%s/include/openssl/ssl.h", VERSION))){
-  if(getRversion() < "3.3.0") setInternet2()
-  download.file(sprintf("https://github.com/rwinlib/openssl/archive/v%s.zip", VERSION),
+
+# This script is used to support R 4.0, 4.1, and 4.2 on Windows, which do not have
+# OpenSSL available via pkg-config. It places the headers in windows/openssl/include
+# and the libs for this R version/arch in windows/openssl/lib to simplify the
+# configure/makevars setup.
+
+openssl_version <- "1.1.1k"
+if(file.exists("windows/openssl/include/openssl/ssl.h")) {
+  cat("Using previously downloaded rwinlibs openssl")
+} else {
+  cat(sprintf("Downloading OpenSSL %s from rwinlibs", openssl_version))
+
+  download.file(sprintf("https://github.com/rwinlib/openssl/archive/v%s.zip", openssl_version),
                 "lib.zip", quiet = TRUE)
   dir.create("../windows", showWarnings = FALSE)
-  unzip("lib.zip", exdir = "../windows")
+  unzip("lib.zip", exdir = "windows")
+
+  file.rename("windows/openssl-1.1.1k", "windows/openssl")
+  crt <- if (packageVersion("base") >= "4.2.0") "-ucrt" else ""
+  libs <- list.files(
+    sprintf("windows/openssl/lib/%s%s", .Platform$r_arch, crt),
+    full.names = TRUE
+  )
+
+  file.copy(libs, "windows/openssl/lib")
   unlink("lib.zip")
 }