examples: more minor fixes (#1503)

1. disable apr_util from finding postgres on the host system. 
2. bump gn to a new version that honors the request to disable git
3. bump gperftools to a new version so it builds with a modern toolchain
(it was using functions that were removed in c++11). Unfortunately, it
now targets c++17, whereas bazel 7's cc toolchain forces c++14 by
default, so override that with copts and also work around the new gtest
problems. Also, reenable the malloc test since that appears to work now.
(whew)
4. Fix pcre on windows, and disable some host deps there too (it was
finding zlib and bzip2 from the host; point zlib at the example one, and
disable bzip2).

Author: novas0x2a

docs/WORKSPACE.bzlmod

@@ -14,6 +14,7 @@ configure_make(
     configure_options = [
         "--with-apr=$$EXT_BUILD_DEPS/apr",
         "--with-expat=$$EXT_BUILD_DEPS/expat",
+        "--without-pgsql",
     ],
     env = select({
         "@platforms//os:macos": {"AR": ""},

examples/third_party/apr_util/BUILD.apr_util.bazel

@@ -8,10 +8,10 @@ def gn_repositories():
         new_git_repository,
         name = "gn",
         build_file = Label("//gn:BUILD.gn.bazel"),
-        commit = "dfcbc6fed0a8352696f92d67ccad54048ad182b3",
+        commit = "281ba2c91861b10fec7407c4b6172ec3d4661243",
         patch_args = [],
         patch_tool = "bash",
         patches = [Label("//gn:patch.gen_ninja.sh")],
         remote = "https://gn.googlesource.com/gn",
-        shallow_since = "1612864120 +0000",
+        shallow_since = "1639743738 +0000",
     )

examples/third_party/gn/gn_repositories.bzl

@@ -1,21 +1,20 @@
 load("@bazel_skylib//rules:build_test.bzl", "build_test")
 # load("@rules_cc//cc:defs.bzl", "cc_test")
 
+load("@rules_cc//cc:defs.bzl", "cc_test")
+
 exports_files(
     [
         "BUILD.gperftools.bazel",
     ],
     visibility = ["//visibility:public"],
 )
 
-# TODO(rules_foreign_cc#227) This currently gives an error:
-# "ERROR: <...>/use_malloc/BUILD:17:14: in malloc attribute of cc_test rule //:test:
-# configure_make rule '@gperftools//:gperftools_build' is misplaced here (expected cc_library)"
-# cc_test(
-#     name = "malloc_test",
-#     srcs = ["malloc_test.cpp"],
-#     malloc = "@gperftools//:gperftools_build",
-# )
+cc_test(
+    name = "malloc_test",
+    srcs = ["malloc_test.cc"],
+    malloc = "@gperftools//:gperftools_build",
+)
 
 build_test(
     name = "build_test",

examples/third_party/gperftools/BUILD.bazel

@@ -15,6 +15,11 @@ configure_make(
         "--enable-frame-pointers",
         "--disable-libunwind",
     ],
+    copts = [
+        # This package requires c++17, and bazel 7.x's default BAZEL_CXXOPTS is
+        # set to -std=c++14, so override.
+        "-std=c++17",
+    ],
     env = select({
         "@platforms//os:macos": {"AR": ""},
         "//conditions:default": {},
@@ -26,5 +31,14 @@ configure_make(
         "@platforms//os:windows": ["@platforms//:incompatible"],
         "//conditions:default": [],
     }),
+    targets = [
+        # Something is wrong about the project's gtest wiring, resulting in
+        # unittests failing to build due to being unable to find gtest.h. They
+        # don't provide any official method to bypass building the tests, so
+        # work around it by calling the make targets we require directly.
+        "install-libLTLIBRARIES",
+        "install-perftoolsincludeHEADERS",
+        "install-nodist_perftoolsincludeHEADERS",
+    ],
     visibility = ["//visibility:public"],
 )

examples/third_party/gperftools/BUILD.gperftools.bazel

@@ -8,7 +8,7 @@ def gperftools_repositories():
         http_archive,
         name = "gperftools",
         build_file = Label("//gperftools:BUILD.gperftools.bazel"),
-        sha256 = "1ee8c8699a0eff6b6a203e59b43330536b22bbcbe6448f54c7091e5efb0763c9",
-        strip_prefix = "gperftools-2.7",
-        urls = ["https://github.com/gperftools/gperftools/releases/download/gperftools-2.7/gperftools-2.7.tar.gz"],
+        sha256 = "f12624af5c5987f2cc830ee534f754c3c5961eec08004c26a8b80de015cf056f",
+        strip_prefix = "gperftools-2.16",
+        urls = ["https://github.com/gperftools/gperftools/releases/download/gperftools-2.16/gperftools-2.16.tar.gz"],
     )

examples/third_party/gperftools/gperftools_repositories.bzl

@@ -15,8 +15,18 @@ filegroup(
 cmake(
     name = "pcre",
     cache_entries = {
-        "CMAKE_C_FLAGS": "$${CMAKE_C_FLAGS:-} -fPIC",
-    },
+        "CMAKE_DISABLE_FIND_PACKAGE_BZip2": "TRUE",
+        "PCRE2_SUPPORT_LIBZ": "ON",
+    } | select({
+        "@platforms//os:windows": {
+            # PCRE2 adds a "d" postfix for MSVC debug builds by default; keep the
+            # archive name stable so Bazel can locate the declared output.
+            "CMAKE_DEBUG_POSTFIX": "",
+        },
+        "//conditions:default": {
+            "CMAKE_C_FLAGS": "$${CMAKE_C_FLAGS:-} -fPIC",
+        },
+    }),
     lib_source = ":all_srcs",
     out_static_libs = select({
         "@platforms//os:windows": ["pcre2-8.lib"],
@@ -26,6 +36,7 @@ cmake(
         "@platforms//os:windows": ["@rules_foreign_cc_examples_third_party//:broken"],
         "//conditions:default": [],
     }),
+    deps = ["@examples_zlib//:zlib"],
 )
 
 filegroup(