Unify windows build system

.github/workflows/check-standard.yaml

@@ -21,9 +21,9 @@ jobs:
           - {os: macOS-latest,   r: 'release'}
           - {os: windows-latest, r: 'release'}
           - {os: windows-latest, r: 'oldrel-2'}
+          - {os: windows-latest, r: 'oldrel-4'}
           - {os: ubuntu-latest,  r: 'devel', http-user-agent: 'release'}
           - {os: ubuntu-latest,  r: 'release'}
-          - {os: ubuntu-latest,  r: 'oldrel-1'}
           - {os: ubuntu-latest,  r: 'oldrel-4'}
 
     env:

NEWS.md

@@ -1,5 +1,9 @@
 # nanonext 1.5.0.9000 (development)
 
+#### Updates
+
+* Unified Windows build system now compiles 'libmbedtls' and 'libnng' from source even on R <= 4.1 using Rtools40 or earlier.
+
 # nanonext 1.5.0
 
 #### Library Updates

README.Rmd

@@ -156,9 +156,9 @@ As system libraries, 'libnng' is available as libnng-dev (deb) or nng-devel (rpm
 
 #### Windows
 
-For R >= 4.2 using the 'Rtools42' or newer toolchains, 'libnng' v1.10.1 and 'libmbedtls' v3.6.2 will be automatically compiled from the package sources during installation.
+On Windows, 'libnng' v1.10.1 and 'libmbedtls' v3.6.2 will be compiled from the package sources during installation and hence requires the 'Rtools' toolchain.
 
-For previous R versions, pre-compiled 'libnng' v1.10.1 and 'libmbedtls' v3.6.2 libraries are downloaded and used for installation instead.
+For R >= 4.2 using the 'Rtools42' or newer toolchains, the prerequisite 'cmake' is included. For previous R versions using 'Rtools40' or earlier, it may be necessary to separately install a version of 'cmake' in Windows and ensure that it is added to your system's `PATH`.
 
 ### Acknowledgements and Links
 

README.md

@@ -201,12 +201,14 @@ OpenCSW - refer to the ‘cmake’ website for the latest source file.*
 
 #### Windows
 
-For R \>= 4.2 using the ‘Rtools42’ or newer toolchains, ‘libnng’ v1.10.1
-and ‘libmbedtls’ v3.6.2 will be automatically compiled from the package
-sources during installation.
-
-For previous R versions, pre-compiled ‘libnng’ v1.10.1 and ‘libmbedtls’
-v3.6.2 libraries are downloaded and used for installation instead.
+On Windows, ‘libnng’ v1.10.1 and ‘libmbedtls’ v3.6.2 will be compiled
+from the package sources during installation and hence requires the
+‘Rtools’ toolchain.
+
+For R \>= 4.2 using the ‘Rtools42’ or newer toolchains, the prerequisite
+‘cmake’ is included. For previous R versions using ‘Rtools40’ or
+earlier, it may be necessary to separately install a version of ‘cmake’
+in Windows and ensure that it is added to your system’s `PATH`.
 
 ### Acknowledgements and Links
 

cleanup.win

@@ -0,0 +1 @@
+rm -rf src/Makevars install

configure.ucrt → configure.win

@@ -2,6 +2,10 @@
 LIB_VER="110"
 TLS_VER="362"
 
+# Find compiler and export flags
+CC=`"${R_HOME}/bin/R" CMD config CC`
+export CC
+
 tar -xf src/mbedtls-$TLS_VER.tar.xz
 cd mbedtls-$TLS_VER
 echo "Compiling 'libmbedtls' from source ..."
@@ -18,5 +22,11 @@ cmake --build . --target install
 cd ..
 rm -rf nng-$LIB_VER
 
+PKG_CFLAGS="-I../install/include -DNNG_STATIC_LIB"
+PKG_LIBS="-L../install/lib -lnng -lmbedtls -lmbedx509 -lmbedcrypto -lbcrypt -lws2_32"
+
+# Write to Makevars
+sed -e "s|@cflags@|$PKG_CFLAGS|" -e "s|@libs@|$PKG_LIBS|" src/Makevars.in > src/Makevars
+
 # Success
 exit 0