1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
#!/usr/bin/env python3
# Copyright 2022 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
""" An internal set of tools for creating embedded CC targets. """
load("@bazel_tools//tools/cpp:toolchain_utils.bzl", "find_cpp_toolchain")
DEBUGGING = [
"-g",
]
# Standard compiler flags to reduce output binary size.
REDUCED_SIZE_COPTS = [
"-fno-common",
"-fno-exceptions",
"-ffunction-sections",
"-fdata-sections",
]
STRICT_WARNINGS_COPTS = [
"-Wall",
"-Wextra",
# Make all warnings errors, except for the exemptions below.
"-Werror",
"-Wno-error=cpp", # preprocessor #warning statement
"-Wno-error=deprecated-declarations", # [[deprecated]] attribute
]
PW_DEFAULT_COPTS = (
DEBUGGING +
REDUCED_SIZE_COPTS +
STRICT_WARNINGS_COPTS
)
KYTHE_COPTS = [
"-Wno-unknown-warning-option",
]
def add_defaults(kwargs):
"""Adds default arguments suitable for both C and C++ code to kwargs.
Args:
kwargs: cc_* arguments to be modified.
"""
copts = PW_DEFAULT_COPTS + kwargs.get("copts", [])
kwargs["copts"] = select({
"@pigweed//pw_build:kythe": copts + KYTHE_COPTS,
"//conditions:default": copts,
})
# Set linkstatic to avoid building .so files.
kwargs["linkstatic"] = True
kwargs.setdefault("features", [])
# Crosstool--adding this line to features disables header modules, which
# don't work with -fno-rtti. Note: this is not a command-line argument,
# it's "minus use_header_modules".
kwargs["features"].append("-use_header_modules")
def _print_platform_impl(_, ctx):
if hasattr(ctx.rule.attr, "constraint_values"):
for cv in ctx.rule.attr.constraint_values:
# buildifier: disable=print
print(str(ctx.rule.attr.name) + " specifies " + str(cv))
return []
print_platform = aspect(
implementation = _print_platform_impl,
attr_aspects = ["parents"],
doc = """
This is a little debug utility that traverses the platform inheritance
hierarchy and prints all the constraint values.
Example usage:
bazel build \
//pw_build/platforms:lm3s6965evb \
--aspects \
pw_build/bazel_internal/pigweed_internal.bzl%print_platform
""",
)
def compile_cc(
ctx,
srcs,
hdrs,
deps,
includes = [],
defines = [],
user_compile_flags = []):
"""Compiles a list C++ source files.
Args:
ctx: Rule context
srcs: List of C/C++ source files to compile
hdrs: List of C/C++ header files to compile with
deps: Dependencies to link with
includes: List of include paths
defines: List of preprocessor defines to use
user_compile_flags: Extra compiler flags to pass when compiling.
Returns:
A CcInfo provider.
"""
cc_toolchain = find_cpp_toolchain(ctx)
feature_configuration = cc_common.configure_features(
ctx = ctx,
cc_toolchain = cc_toolchain,
requested_features = ctx.features,
unsupported_features = ctx.disabled_features,
)
compilation_contexts = [dep[CcInfo].compilation_context for dep in deps]
compilation_context, compilation_outputs = cc_common.compile(
name = ctx.label.name,
actions = ctx.actions,
feature_configuration = feature_configuration,
cc_toolchain = cc_toolchain,
srcs = srcs,
includes = includes,
defines = defines,
public_hdrs = hdrs,
user_compile_flags = user_compile_flags,
compilation_contexts = compilation_contexts,
)
linking_contexts = [dep[CcInfo].linking_context for dep in deps]
linking_context, _ = cc_common.create_linking_context_from_compilation_outputs(
actions = ctx.actions,
feature_configuration = feature_configuration,
cc_toolchain = cc_toolchain,
compilation_outputs = compilation_outputs,
linking_contexts = linking_contexts,
disallow_dynamic_library = True,
name = ctx.label.name,
)
transitive_output_files = [dep[DefaultInfo].files for dep in deps]
output_files = depset(
compilation_outputs.pic_objects + compilation_outputs.objects,
transitive = transitive_output_files,
)
return [DefaultInfo(files = output_files), CcInfo(
compilation_context = compilation_context,
linking_context = linking_context,
)]
|
