Support location expansion and make variable substitution in CMake cache entries (#1272)

Author: allsey87

examples/cmake_synthetic/BUILD.bazel

@@ -21,8 +21,8 @@ cmake(
 cmake(
     name = "lib_with_duplicate_transitive_bazel_deps",
     cache_entries = {
-        "LIBA_DIR": "$$EXT_BUILD_DEPS$$",
-        "LIBB_DIR": "$$EXT_BUILD_DEPS$$",
+        "LIBA_DIR": "$$EXT_BUILD_DEPS",
+        "LIBB_DIR": "$$EXT_BUILD_DEPS",
     },
     generate_args = ["-GNinja"],
     lib_name = "libc",

examples/cmake_with_bazel_transitive/BUILD.bazel

@@ -10,7 +10,7 @@ cmake(
         "CMAKE_DISABLE_FIND_PACKAGE_LIBA": "True",
         # as currently we copy all libraries, built with Bazel, into $EXT_BUILD_DEPS/lib
         # and the headers into $EXT_BUILD_DEPS/include
-        "LIBA_DIR": "$EXT_BUILD_DEPS",
+        "LIBA_DIR": "$$EXT_BUILD_DEPS",
     },
     generate_args = ["-GNinja"],
     lib_source = "//cmake_with_bazel_transitive/libb:b_srcs",

examples/third_party/curl/BUILD.curl.bazel

@@ -12,11 +12,11 @@ _CACHE_ENTRIES = {
     "BUILD_CURL_EXE": "off",
     "BUILD_SHARED_LIBS": "off",
     "CMAKE_BUILD_TYPE": "RELEASE",
-    "CMAKE_PREFIX_PATH": "$$EXT_BUILD_DEPS$$/openssl",
+    "CMAKE_PREFIX_PATH": "$$EXT_BUILD_DEPS/openssl",
     "CMAKE_USE_OPENSSL": "on",
     # TODO: ldap should likely be enabled
     "CURL_DISABLE_LDAP": "on",
-    "OPENSSL_ROOT_DIR": "$$EXT_BUILD_DEPS$$/openssl",
+    "OPENSSL_ROOT_DIR": "$$EXT_BUILD_DEPS/openssl",
 }
 
 _MACOS_CACHE_ENTRIES = dict(_CACHE_ENTRIES.items() + {

examples/third_party/libgit2/BUILD.libgit2.bazel

@@ -13,13 +13,13 @@ _CACHE_ENTRIES = {
     "BUILD_EXAMPLES": "off",
     "BUILD_FUZZERS": "off",
     "BUILD_SHARED_LIBS": "off",
-    "CMAKE_PREFIX_PATH": "$EXT_BUILD_DEPS/pcre;$EXT_BUILD_DEPS/openssl;$EXT_BUILD_DEPS/libssh2;$EXT_BUILD_DEPS/zlib;${CMAKE_PREFIX_PATH:-}",
-    "EMBED_SSH_PATH": "$(location @libssh2//:libssh2)",
+    "CMAKE_PREFIX_PATH": "$$EXT_BUILD_DEPS/pcre;$$EXT_BUILD_DEPS/openssl;$$EXT_BUILD_DEPS/libssh2;$$EXT_BUILD_DEPS/zlib;$${CMAKE_PREFIX_PATH:-}",
+    #"EMBED_SSH_PATH": "$(location @libssh2//:libssh2)",
     "USE_HTTPS": "on",
 }
 
 _LINUX_CACHE_ENTRIES = dict(_CACHE_ENTRIES.items() + {
-    "CMAKE_C_FLAGS": "${CMAKE_C_FLAGS:-} -fPIC",
+    "CMAKE_C_FLAGS": "$${CMAKE_C_FLAGS:-} -fPIC",
     "REGEX_BACKEND": "pcre2",
 }.items())
 

examples/third_party/libpng/BUILD.libpng.bazel

@@ -15,7 +15,7 @@ cmake(
     cache_entries = {
         "CMAKE_BUILD_TYPE": "RELEASE",
         "CMAKE_POLICY_DEFAULT_CMP0074": "NEW",
-        "ZLIB_ROOT": "$EXT_BUILD_DEPS/zlib",
+        "ZLIB_ROOT": "$$EXT_BUILD_DEPS/zlib",
     },
     lib_source = "//:all_srcs",
     out_include_dir = "include/libpng16",

examples/third_party/libssh2/BUILD.libssh2.bazel

@@ -13,11 +13,11 @@ _CACHE_ENTRIES = {
     "BUILD_SHARED_LIBS": "off",
     "BUILD_TESTING": "off",
     "CMAKE_FIND_DEBUG_MODE": "on",
-    "CMAKE_PREFIX_PATH": "${CMAKE_PREFIX_PATH:-};$EXT_BUILD_DEPS/openssl",
+    "CMAKE_PREFIX_PATH": "$${CMAKE_PREFIX_PATH:-};$$EXT_BUILD_DEPS/openssl",
 }
 
 _LINUX_CACHE_ENTRIES = dict(_CACHE_ENTRIES.items() + {
-    "CMAKE_C_FLAGS": "${CMAKE_C_FLAGS:-} -fPIC",
+    "CMAKE_C_FLAGS": "$${CMAKE_C_FLAGS:-} -fPIC",
 }.items())
 
 cmake(

examples/third_party/pcre/BUILD.pcre.bazel

@@ -15,7 +15,7 @@ filegroup(
 cmake(
     name = "pcre",
     cache_entries = {
-        "CMAKE_C_FLAGS": "${CMAKE_C_FLAGS:-} -fPIC",
+        "CMAKE_C_FLAGS": "$${CMAKE_C_FLAGS:-} -fPIC",
     },
     lib_source = ":all_srcs",
     out_static_libs = select({

examples/third_party/zlib/BUILD.zlib.bazel

@@ -15,7 +15,7 @@ cmake(
     name = "zlib",
     cache_entries = select({
         "@platforms//os:linux": {
-            "CMAKE_C_FLAGS": "${CMAKE_C_FLAGS:-} -fPIC",
+            "CMAKE_C_FLAGS": "$${CMAKE_C_FLAGS:-} -fPIC",
         },
         "//conditions:default": {},
     }),

foreign_cc/cmake.bzl

@@ -264,7 +264,7 @@ def _create_configure_script(configureParameters):
         install_prefix = "$$INSTALLDIR$$",
         root = root,
         no_toolchain_file = no_toolchain_file,
-        user_cache = dict(ctx.attr.cache_entries),
+        user_cache = expand_locations_and_make_variables(ctx, ctx.attr.cache_entries, "cache_entries", data),
         user_env = expand_locations_and_make_variables(ctx, ctx.attr.env, "env", data),
         options = attrs.generate_args,
         cmake_commands = cmake_commands,