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
|
# Copyright 2021 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.
_script_path =
get_path_info("../py/pw_toolchain/clang_arm_toolchain.py", "abspath")
# This template generates a config that can be used to target ARM cores using
# a clang compiler.
#
# Clang isn't a plug-and-play experience for Cortex-M baremetal targets; it's
# missing C runtime libraries, C/C++ standard libraries, and a few other
# things. This template uses the provided cflags, asmflags, ldflags, etc. to
# generate a config that pulls the missing components from an arm-none-eabi-gcc
# compiler on the system PATH. The end result is a clang-based compiler that
# pulls in gcc-provided headers and libraries to complete the toolchain.
#
# Args:
# - asmflags, cflags, cflags_c, cflags_cc, ldflags: These flags are used to
# locate the correct architecture-specific libraries/headers. To
# properly drive the script, provide all architecture flags (e.g. -mcpu,
# -mabi, -mthumb, -mfloat-abi, -mfpu) in at least one of these
# variables.
#
# Generated targets:
# - $target_name: The final config to use with your clang toolchain.
template("pw_clang_arm_config") {
config(target_name) {
# Pull all the compiler flags into a single list.
_compiler_flags = []
forward_variables_from(invoker, "*")
if (defined(asmflags)) {
_compiler_flags += asmflags
} else {
asmflags = []
}
if (defined(cflags)) {
_compiler_flags += cflags
} else {
cflags = []
}
if (defined(cflags_c)) {
_compiler_flags += cflags_c
} else {
cflags_c = []
}
if (defined(cflags_cc)) {
_compiler_flags += cflags_cc
} else {
cflags_cc = []
}
if (defined(ldflags)) {
_compiler_flags += ldflags
} else {
ldflags = []
}
# Invoke the script that will generate clang flags based on the current
# compiler version and desired arch.
_script_flags = [
"--gn-scope",
"--cflags",
"--ldflags",
"--",
]
_script_flags += _compiler_flags
_arm_flags = exec_script(_script_path, _script_flags, "scope")
cflags += _arm_flags.cflags
ldflags += _arm_flags.cflags
ldflags += _arm_flags.ldflags
}
}
|
