# Implement a macro glog_library() that the BUILD file can load.
# By default, glog is built with gflags support. You can change this behavior
# by using glog_library(with_gflags=0)
#
# This file is inspired by the following sample BUILD files:
# https://github.com/google/glog/issues/61
# https://github.com/google/glog/files/393474/BUILD.txt
#
# Known issue: the namespace parameter is not supported on Win32.
def glog_library(namespace = "google", with_gflags = 1, **kwargs):
if native.repository_name() != "@":
repo_name = native.repository_name().lstrip("@")
gendir = "$(GENDIR)/external/" + repo_name
src_windows = "external/%s/src/windows" % repo_name
else:
gendir = "$(GENDIR)"
src_windows = "src/windows"
# Config setting for WebAssembly target.
native.config_setting(
name = "wasm",
values = {"cpu": "wasm"},
)
common_copts = [
"-DGLOG_BAZEL_BUILD",
"-DHAVE_STDINT_H",
"-DHAVE_STRING_H",
"-DHAVE_UNWIND_H",
] + (["-DHAVE_LIB_GFLAGS"] if with_gflags else [])
wasm_copts = [
# Disable warnings that exists in glog.
"-Wno-sign-compare",
"-Wno-unused-function",
"-Wno-unused-local-typedefs",
"-Wno-unused-variable",
# Inject a C++ namespace.
"-DGOOGLE_NAMESPACE='%s'" % namespace,
# Allows src/base/mutex.h to include pthread.h.
"-DHAVE_PTHREAD",
# Allows src/logging.cc to determine the host name.
"-DHAVE_SYS_UTSNAME_H",
# For src/utilities.cc.
"-DHAVE_SYS_TIME_H",
# Enable dumping stacktrace upon sigaction.
"-DHAVE_SIGACTION",
# For logging.cc.
"-DHAVE_PREAD",
"-DHAVE___ATTRIBUTE__",
"-I%s/glog_internal" % gendir,
]
linux_or_darwin_copts = wasm_copts + [
# For src/utilities.cc.
"-DHAVE_SYS_SYSCALL_H",
]
freebsd_only_copts = [
# Enable declaration of _Unwind_Backtrace
"-D_GNU_SOURCE",
]
darwin_only_copts = [
# For stacktrace.
"-DHAVE_DLADDR",
]
windows_only_copts = [
"-DHAVE_SNPRINTF",
"-I" + src_windows,
]
windows_only_srcs = [
"src/glog/log_severity.h",
"src/windows/config.h",
"src/windows/port.cc",
"src/windows/port.h",
]
gflags_deps = ["@com_github_gflags_gflags//:gflags"] if with_gflags else []
native.cc_library(
name = "glog",
visibility = ["//visibility:public"],
srcs = [
"src/base/commandlineflags.h",
"src/base/googleinit.h",
"src/base/mutex.h",
"src/demangle.cc",
"src/demangle.h",
"src/logging.cc",
"src/raw_logging.cc",
"src/signalhandler.cc",
"src/stacktrace.h",
"src/stacktrace_generic-inl.h",
"src/stacktrace_libunwind-inl.h",
"src/stacktrace_powerpc-inl.h",
"src/stacktrace_windows-inl.h",
"src/stacktrace_x86-inl.h",
"src/stacktrace_x86_64-inl.h",
"src/symbolize.cc",
"src/symbolize.h",
"src/utilities.cc",
"src/utilities.h",
"src/vlog_is_on.cc",
] + select({
"@bazel_tools//src/conditions:windows": windows_only_srcs,
"//conditions:default": [":config_h"],
}),
copts =
select({
"@bazel_tools//src/conditions:windows": common_copts + windows_only_copts,
"@bazel_tools//src/conditions:darwin": common_copts + linux_or_darwin_copts + darwin_only_copts,
"@bazel_tools//src/conditions:freebsd": common_copts + linux_or_darwin_copts + freebsd_only_copts,
":wasm": common_copts + wasm_copts,
"//conditions:default": common_copts + linux_or_darwin_copts,
}),
deps = [
":glog_headers",
] + gflags_deps,
**kwargs
)
# glog headers vary depending on the os.
native.cc_library(
name = "glog_headers",
deps = select({
"@bazel_tools//src/conditions:windows": [":windows_glog_headers"],
"//conditions:default": [":default_glog_headers"],
}),
)
native.cc_library(
name = "windows_glog_headers",
hdrs = native.glob(["src/windows/glog/*.h"]),
strip_include_prefix = "src/windows",
# We need to override the default GOOGLE_GLOG_DLL_DECL from
# src/windows/glog/*.h to match src/windows/config.h.
defines = ["GOOGLE_GLOG_DLL_DECL=__declspec(dllexport)"],
deps = [":strip_include_prefix_hack"],
)
# Workaround https://github.com/bazelbuild/bazel/issues/6337 by declaring
# the dependencies without strip_include_prefix.
native.cc_library(
name = "strip_include_prefix_hack",
hdrs = native.glob(["src/windows/*.h"]),
)
native.cc_library(
name = "default_glog_headers",
strip_include_prefix = "src",
hdrs = [
"src/glog/log_severity.h",
":logging_h",
":raw_logging_h",
":stl_logging_h",
":vlog_is_on_h",
],
)
native.genrule(
name = "config_h",
srcs = [
"src/config.h.cmake.in",
],
outs = [
"glog_internal/config.h",
],
cmd = "awk '{ gsub(/^#cmakedefine/, \"//cmakedefine\"); print; }' $< > $@",
)
native.genrule(
name = "gen_sh",
outs = [
"gen.sh",
],
cmd = r'''\
#!/bin/sh
cat > $@ <<"EOF"
sed -e 's/@ac_cv_cxx_using_operator@/1/g' \
-e 's/@ac_cv_have_unistd_h@/1/g' \
-e 's/@ac_cv_have_stdint_h@/1/g' \
-e 's/@ac_cv_have_systypes_h@/1/g' \
-e 's/@ac_cv_have_libgflags@/{}/g' \
-e 's/@ac_cv_have_uint16_t@/1/g' \
-e 's/@ac_cv_have___builtin_expect@/1/g' \
-e 's/@ac_cv_have_.*@/0/g' \
-e 's/@ac_google_start_namespace@/namespace google {{/g' \
-e 's/@ac_google_end_namespace@/}}/g' \
-e 's/@ac_google_namespace@/google/g' \
-e 's/@ac_cv___attribute___noinline@/__attribute__((noinline))/g' \
-e 's/@ac_cv___attribute___noreturn@/__attribute__((noreturn))/g' \
-e 's/@ac_cv___attribute___printf_4_5@/__attribute__((__format__ (__printf__, 4, 5)))/g'
EOF
'''.format(int(with_gflags)),
)
[
native.genrule(
name = "%s_h" % f,
srcs = [
"src/glog/%s.h.in" % f,
],
outs = [
"src/glog/%s.h" % f,
],
cmd = "$(location :gen_sh) < $< > $@",
tools = [":gen_sh"],
)
for f in [
"vlog_is_on",
"stl_logging",
"raw_logging",
"logging",
]
]
