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Bazel build implementation, doesn't provide options for the compilation modes opt and debug #2395

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c565e26
Bazel add default compliation args for opt and debug. Can be overriden
NolanBrad Apr 3, 2025
39dc067
Add docstrings for new compilation mode override flags
NolanBrad Apr 4, 2025
f956772
Remove cc_args_list shims, which arent needed anymore for cc_feature
NolanBrad Apr 4, 2025
525aa94
Add Compilation mode overrides to the BAZEL_ONLY_ALLOWLIST, these don…
NolanBrad Apr 4, 2025
e346e6d
For completness add the fastbuild default options, and override flag
NolanBrad Apr 4, 2025
f5b3b9f
Remove the default options for fastbuiild, as the bazel doc defaults …
NolanBrad Apr 4, 2025
9ac79e0
Rename the config and constraint labels from OVERRIDE to REMOVE_DEFS
NolanBrad Apr 5, 2025
9ae798d
Merge branch 'develop' into Bazel-default-compilation-args
NolanBrad Apr 13, 2025
0bbbe6d
Change naming of flags from PICO_COMPILATION_XXX_REMOVE_DEFS to PICO_…
NolanBrad Apr 14, 2025
c7b4c9b
Fixup spellling mistakes, and comments
NolanBrad Apr 15, 2025
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18 changes: 18 additions & 0 deletions bazel/config/BUILD.bazel
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Original file line number Diff line number Diff line change
Expand Up @@ -300,3 +300,21 @@ label_flag(
name = "PICO_MBEDTLS_CONFIG",
build_setting_default = "//bazel:empty_cc_lib",
)

# PICO_BAZEL_CONFIG: PICO_COMPILATION_NO_OPT_ARGS, Makes the opt compilation mode a no-op so custom optimization arguments can be injected via the --copt flag instead, type=bool, default=0, group=build
bool_flag(
name = "PICO_COMPILATION_NO_OPT_ARGS",
build_setting_default = False,
)

# PICO_BAZEL_CONFIG: PICO_COMPILATION_NO_DEBUG_ARGS, Makes the debug compilation mode a no-op so custom debug arguments can be injected via the --copt flag instead, type=bool, default=0, group=build
bool_flag(
name = "PICO_COMPILATION_NO_DEBUG_ARGS",
build_setting_default = False,
)

# PICO_BAZEL_CONFIG: PICO_COMPILATION_NO_FASTBUILD_ARGS, Makes the fastbuild compilation mode a no-op so custom fastbuild arguments can be injected via the --copt flag instead, type=bool, default=0, group=build
bool_flag(
name = "PICO_COMPILATION_NO_FASTBUILD_ARGS",
build_setting_default = False,
)
15 changes: 15 additions & 0 deletions bazel/constraint/BUILD.bazel
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Original file line number Diff line number Diff line change
Expand Up @@ -258,3 +258,18 @@ label_flag_matches(
flag = "//bazel/config:PICO_MBEDTLS_CONFIG",
value = "//bazel:empty_cc_lib",
)

config_setting(
name = "pico_compilation_no_opt_args_set",
flag_values = {"//bazel/config:PICO_COMPILATION_NO_OPT_ARGS": "True"},
)

config_setting(
name = "pico_compilation_no_debug_args_set",
flag_values = {"//bazel/config:PICO_COMPILATION_NO_DEBUG_ARGS": "True"},
)

config_setting(
name = "pico_compilation_no_fastbuild_args_set",
flag_values = {"//bazel/config:PICO_COMPILATION_NO_FASBUILD_ARGS": "True"},
)
70 changes: 55 additions & 15 deletions bazel/toolchain/BUILD.bazel
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Expand Up @@ -89,15 +89,46 @@ cc_args(
)

cc_args(
name = "opt_debug_args",
name = "debug_args",
actions = [
"@rules_cc//cc/toolchains/actions:compile_actions",
"@rules_cc//cc/toolchains/actions:link_actions",
],
args = [
"-Og", # TODO: Make this configurable.
"-g3",
args = select({
"//bazel/constraint:pico_compilation_no_debug_args_set": [],
"//conditions:default": [
"-Og",
"-g3",
],
})
)

cc_args(
name = "opt_args",
actions = [
"@rules_cc//cc/toolchains/actions:compile_actions",
"@rules_cc//cc/toolchains/actions:link_actions",
],
args = select({
"//bazel/constraint:pico_compilation_no_opt_args_set": [],
"//conditions:default": [
"-O2",
"-DNDEBUG",
],
})
)

cc_args(
name = "fastbuild_args",
actions = [
"@rules_cc//cc/toolchains/actions:compile_actions",
"@rules_cc//cc/toolchains/actions:link_actions",
],
args = select({
"//bazel/constraint:pico_compilation_no_fastbuild_args_set": [],
# The conditions default are kept as nothing here, The bazel docs default are -gmlt -Wl,-S.
"//conditions:default": [],
})
)

configurable_toolchain_feature(
Expand Down Expand Up @@ -132,18 +163,25 @@ configurable_toolchain_feature(
linkopts = ["-Wl,-z,max-page-size=4096"],
)

# TODO: Make this shim unnecessary.
cc_args_list(
name = "all_opt_debug_args",
args = [":opt_debug_args"],
)

cc_feature(
name = "override_debug",
args = [":all_opt_debug_args"],
name = "dbg",
args = [":debug_args"],
overrides = "@rules_cc//cc/toolchains/features:dbg",
)

cc_feature(
name = "opt",
args = [":opt_args"],
overrides = "@rules_cc//cc/toolchains/features:opt",
)

cc_feature(
name = "fastbuild",
args = [":fastbuild_args"],
overrides = "@rules_cc//cc/toolchains/features:fastbuild",
)

HOSTS = (
("linux", "x86_64"),
("linux", "aarch64"),
Expand Down Expand Up @@ -180,7 +218,9 @@ _HOST_CPU_CONSTRAINTS = {
tags = ["manual"], # Don't try to build this in wildcard builds.
known_features = [
"@rules_cc//cc/toolchains/args:experimental_replace_legacy_action_config_features",
"@pico-sdk//bazel/toolchain:override_debug",
"@pico-sdk//bazel/toolchain:dbg",
"@pico-sdk//bazel/toolchain:opt",
"@pico-sdk//bazel/toolchain:fastbuild",
"@pico-sdk//bazel/toolchain:gc_sections",
"@pico-sdk//bazel/toolchain:cxx_no_exceptions",
"@pico-sdk//bazel/toolchain:cxx_no_rtti",
Expand All @@ -189,7 +229,6 @@ _HOST_CPU_CONSTRAINTS = {
],
enabled_features = [
"@rules_cc//cc/toolchains/args:experimental_replace_legacy_action_config_features",
"@pico-sdk//bazel/toolchain:override_debug",
] + select({
"//bazel/constraint:pico_no_gc_sections_enabled": [],
"//conditions:default": [":gc_sections"],
Expand Down Expand Up @@ -232,7 +271,9 @@ _HOST_CPU_CONSTRAINTS = {
tags = ["manual"], # Don't try to build this in wildcard builds.
known_features = [
"@rules_cc//cc/toolchains/args:experimental_replace_legacy_action_config_features",
"@pico-sdk//bazel/toolchain:override_debug",
"@pico-sdk//bazel/toolchain:dbg",
"@pico-sdk//bazel/toolchain:opt",
"@pico-sdk//bazel/toolchain:fastbuild",
"@pico-sdk//bazel/toolchain:gc_sections",
"@pico-sdk//bazel/toolchain:cxx_no_exceptions",
"@pico-sdk//bazel/toolchain:cxx_no_rtti",
Expand All @@ -241,7 +282,6 @@ _HOST_CPU_CONSTRAINTS = {
],
enabled_features = [
"@rules_cc//cc/toolchains/args:experimental_replace_legacy_action_config_features",
"@pico-sdk//bazel/toolchain:override_debug",
] + select({
"//bazel/constraint:pico_no_gc_sections_enabled": [],
"//conditions:default": [":gc_sections"],
Expand Down
4 changes: 4 additions & 0 deletions tools/compare_build_systems.py
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Original file line number Diff line number Diff line change
Expand Up @@ -158,6 +158,10 @@
"PICO_BT_ENABLE_BLE",
"PICO_BT_ENABLE_CLASSIC",
"PICO_BT_ENABLE_MESH",
# Compilation modes remove, These allow the user to remove the defaults, with no args. See --compilation_mode cmd line option
"PICO_COMPILATION_NO_OPT_ARGS",
"PICO_COMPILATION_NO_DEBUG_ARGS",
"PICO_COMPILATION_NO_FASTBUILD_ARGS",
)


Expand Down