[libxslt] add optional feature support (#24240)

Signed-off-by: Gordon Smith <GordonJSmith@gmail.com>

ports/libxslt/portfile.cmake

@@ -20,6 +20,7 @@ vcpkg_from_github(
         0002-Fix-lzma.patch
         0003-Fix-configure.patch
         only_build_one_lib_type.patch
+        require-dependencies.patch
 )
 
 if (VCPKG_TARGET_IS_WINDOWS)
@@ -125,13 +126,31 @@ if (VCPKG_TARGET_IS_WINDOWS)
         file(COPY "${CURRENT_PACKAGES_DIR}/lib/pkgconfig" DESTINATION "${CURRENT_PACKAGES_DIR}/debug/lib")
     endif()
 else()
+    if("python" IN_LIST FEATURES)
+        vcpkg_find_acquire_program(PYTHON3)
+        set(OPTION_PYTHON "--with-python=${PYTHON3}")
+    else()
+        set(OPTION_PYTHON "--without-python")
+    endif()
+    if ("plugins" IN_LIST FEATURES)
+        set(OPTION_PLUGINS "--with-plugins")
+    else()
+        set(OPTION_PLUGINS "--without-plugins")
+    endif()
+    if("crypto" IN_LIST FEATURES)
+        vcpkg_add_to_path(PREPEND "${CURRENT_INSTALLED_DIR}/tools/libgcrypt/bin")
+        set(OPTION_CRYPTO "--with-crypto")
+    else()
+        set(OPTION_CRYPTO "--without-crypto")
+    endif()
+
     vcpkg_configure_make(
         SOURCE_PATH "${SOURCE_PATH}"
         AUTOCONFIG
         OPTIONS
-            --without-python
-            --without-plugins
-            --with-crypto
+            ${OPTION_PYTHON}
+            ${OPTION_PLUGINS}
+            ${OPTION_CRYPTO}
         OPTIONS_DEBUG
             --with-mem-debug
             --with-debug

ports/libxslt/require-dependencies.patch

@@ -0,0 +1,44 @@
+--- a/configure.ac
++++ b/configure.ac
+@@ -240,12 +240,13 @@
+     else
+ 	if test -x "$with_python"
+ 	then
+ 	    echo Found python in $with_python
+ 	    PYTHON="$with_python"
+ 	else
++            AC_MSG_ERROR([Python not found; --with-python should be set to the python path])
+             if test -x "$PYTHON"
+             then
+                 echo Found python in environment PYTHON=$PYTHON
+                 with_python=`$PYTHON -c "import sys; print sys.exec_prefix"`
+ 	    else
+ 	        AC_PATH_PROG(PYTHON, python python2.4 python2.3 python2.2 python2.1 python2.0 python1.6 python1.5)
+@@ -333,25 +334,25 @@
+     if test "$LIBGCRYPT_CONFIG" != "no" ; then
+       LIBGCRYPT_VERSION=`$LIBGCRYPT_CONFIG --version`
+       if test VERSION_TO_NUMBER(echo $LIBGCRYPT_VERSION) -lt VERSION_TO_NUMBER(echo "1.1.42")
+       then
+         LIBGCRYPT_CFLAGS=""
+         LIBGCRYPT_LIBS=""
+-        echo 'gcrypt library version < 1.1.42 - Crypto extensions will not be available.'
++        AC_MSG_ERROR([gcrypt library version < 1.1.42 - this is an error])
+       else
+         LIBGCRYPT_CFLAGS=`$LIBGCRYPT_CONFIG $libgcrypt_config_args --cflags`
+         LIBGCRYPT_LIBS=`$LIBGCRYPT_CONFIG $libgcrypt_config_args --libs`
+         AC_DEFINE(HAVE_GCRYPT, 1, [Define if gcrypt library is available.])
+         echo 'Crypto extensions will be available.'
+         WITH_CRYPTO=1
+         CRYPTO_TESTDIR=crypto
+       fi
+     else
+       LIBGCRYPT_CFLAGS=""
+       LIBGCRYPT_LIBS=""
+-      echo 'Crypto extensions will not be available. Install libgcrypt and reconfigure to make available.'
++      AC_MSG_ERROR([libgcrypt not found - this is a bug in the vcpkg port])
+     fi
+ esac
+ fi
+ AC_SUBST(WITH_CRYPTO)
+ AC_SUBST(CRYPTO_TESTDIR)
+ AC_SUBST(LIBGCRYPT_CFLAGS)

ports/libxslt/vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "libxslt",
   "version": "1.1.34",
-  "port-version": 4,
+  "port-version": 5,
   "description": "Libxslt is a XSLT library implemented in C for XSLT 1.0 and most of EXSLT",
   "homepage": "https://github.com/GNOME/libxslt",
   "license": null,
@@ -9,5 +9,39 @@
   "dependencies": [
     "liblzma",
     "libxml2"
-  ]
+  ],
+  "default-features": [
+    "default-features"
+  ],
+  "features": {
+    "crypto": {
+      "description": "Build with crypto support (--with-crypto)",
+      "supports": "mingw | !windows",
+      "dependencies": [
+        {
+          "name": "libgcrypt",
+          "platform": "!mingw"
+        }
+      ]
+    },
+    "default-features": {
+      "description": "default features for the current platform",
+      "dependencies": [
+        {
+          "name": "libxslt",
+          "default-features": false,
+          "features": [
+            "crypto"
+          ],
+          "platform": "mingw | !windows"
+        }
+      ]
+    },
+    "plugins": {
+      "description": "Build with plugins (--with-plugins)"
+    },
+    "python": {
+      "description": "Builds with python support (--with-python)"
+    }
+  }
 }

versions/baseline.json

@@ -4198,7 +4198,7 @@
     },
     "libxslt": {
       "baseline": "1.1.34",
-      "port-version": 4
+      "port-version": 5
     },
     "libyaml": {
       "baseline": "0.2.5",

versions/l-/libxslt.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "063e2e6a6b9ef700f0c2587d2def57eb0e2285e6",
+      "version": "1.1.34",
+      "port-version": 5
+    },
     {
       "git-tree": "034ea26a2cde47c4d19df6eb35bc124a79ad37a3",
       "version": "1.1.34",