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Message-Id: <20221231064203.1623793-2-masahiroy@kernel.org>
Date: Sat, 31 Dec 2022 15:41:58 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: linux-kbuild@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Miguel Ojeda <ojeda@...nel.org>,
Masahiro Yamada <masahiroy@...nel.org>,
Alex Gaynor <alex.gaynor@...il.com>,
Björn Roy Baron <bjorn3_gh@...tonmail.com>,
Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Nicolas Schier <nicolas@...sle.eu>, Tom Rix <trix@...hat.com>,
Wedson Almeida Filho <wedsonaf@...il.com>,
llvm@...ts.linux.dev, rust-for-linux@...r.kernel.org
Subject: [PATCH 1/6] kbuild: specify output names separately for each emission type from rustc
In Kbuild, two different rules must not write to the same file, but
it happens when compiling rust source files.
For example, set CONFIG_SAMPLE_RUST_MINIMAL=m and run the following:
$ make -j$(nproc) samples/rust/rust_minimal.o samples/rust/rust_minimal.rsi \
samples/rust/rust_minimal.s samples/rust/rust_minimal.ll
[snip]
RUSTC [M] samples/rust/rust_minimal.o
RUSTC [M] samples/rust/rust_minimal.rsi
RUSTC [M] samples/rust/rust_minimal.s
RUSTC [M] samples/rust/rust_minimal.ll
mv: cannot stat 'samples/rust/rust_minimal.d': No such file or directory
make[3]: *** [scripts/Makefile.build:334: samples/rust/rust_minimal.ll] Error 1
make[3]: *** Waiting for unfinished jobs....
mv: cannot stat 'samples/rust/rust_minimal.d': No such file or directory
make[3]: *** [scripts/Makefile.build:309: samples/rust/rust_minimal.o] Error 1
mv: cannot stat 'samples/rust/rust_minimal.d': No such file or directory
make[3]: *** [scripts/Makefile.build:326: samples/rust/rust_minimal.s] Error 1
make[2]: *** [scripts/Makefile.build:504: samples/rust] Error 2
make[1]: *** [scripts/Makefile.build:504: samples] Error 2
make: *** [Makefile:2008: .] Error 2
The reason for the error is that 4 threads running in parallel creates
and renames the same file path, samples/rust/rust_minimal.d.
This does not happen when compiling C or assembly files because we
explicitly specify the dependency filename by using the preprocessor
option, -Wp,-MMD,$(depfile). $(depfile) is a unique path for each target.
Currently, rustc is only given --out-dir and the list of emitted types.
So, all the rust build rules output the dep-info into the default
<CRATE_NAME>.d, causing the conflict.
Fortunately, the --emit option is able to specify the output path
individually, with the form --emit=<type>=<path>.
Add --emit=dep-info=$(depfile) to the common command part. Also, remove
the redundant --out-dir because we specify the output path for each type.
The code gets much cleaner because we do not need to rename *.d files.
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---
rust/Makefile | 10 ++++------
scripts/Makefile.build | 14 +++++++-------
scripts/Makefile.host | 9 +++------
3 files changed, 14 insertions(+), 19 deletions(-)
diff --git a/rust/Makefile b/rust/Makefile
index ff70c4c916f8..0e2a32f4b3e9 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -331,10 +331,9 @@ $(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE
quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
cmd_rustc_procmacro = \
$(RUSTC_OR_CLIPPY) $(rust_common_flags) \
- --emit=dep-info,link --extern proc_macro \
- --crate-type proc-macro --out-dir $(objtree)/$(obj) \
+ --emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \
+ --crate-type proc-macro \
--crate-name $(patsubst lib%.so,%,$(notdir $@)) $<; \
- mv $(objtree)/$(obj)/$(patsubst lib%.so,%,$(notdir $@)).d $(depfile); \
sed -i '/^\#/d' $(depfile)
# Procedural macros can only be used with the `rustc` that compiled it.
@@ -348,10 +347,9 @@ quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L
OBJTREE=$(abspath $(objtree)) \
$(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
$(filter-out $(skip_flags),$(rust_flags) $(rustc_target_flags)) \
- --emit=dep-info,obj,metadata --crate-type rlib \
- --out-dir $(objtree)/$(obj) -L$(objtree)/$(obj) \
+ --emit=dep-info=$(depfile) --emit=obj=$@ --emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \
+ --crate-type rlib -L$(objtree)/$(obj) \
--crate-name $(patsubst %.o,%,$(notdir $@)) $<; \
- mv $(objtree)/$(obj)/$(patsubst %.o,%,$(notdir $@)).d $(depfile); \
sed -i '/^\#/d' $(depfile) \
$(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index a0d5c6cca76d..40de20246e50 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -285,11 +285,11 @@ rust_common_cmd = \
-Zcrate-attr=no_std \
-Zcrate-attr='feature($(rust_allowed_features))' \
--extern alloc --extern kernel \
- --crate-type rlib --out-dir $(obj) -L $(objtree)/rust/ \
- --crate-name $(basename $(notdir $@))
+ --crate-type rlib -L $(objtree)/rust/ \
+ --crate-name $(basename $(notdir $@)) \
+ --emit=dep-info=$(depfile)
rust_handle_depfile = \
- mv $(obj)/$(basename $(notdir $@)).d $(depfile); \
sed -i '/^\#/d' $(depfile)
# `--emit=obj`, `--emit=asm` and `--emit=llvm-ir` imply a single codegen unit
@@ -302,7 +302,7 @@ rust_handle_depfile = \
quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
cmd_rustc_o_rs = \
- $(rust_common_cmd) --emit=dep-info,obj $<; \
+ $(rust_common_cmd) --emit=obj=$@ $<; \
$(rust_handle_depfile)
$(obj)/%.o: $(src)/%.rs FORCE
@@ -310,7 +310,7 @@ $(obj)/%.o: $(src)/%.rs FORCE
quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
cmd_rustc_rsi_rs = \
- $(rust_common_cmd) --emit=dep-info -Zunpretty=expanded $< >$@; \
+ $(rust_common_cmd) -Zunpretty=expanded $< >$@; \
command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) $@; \
$(rust_handle_depfile)
@@ -319,7 +319,7 @@ $(obj)/%.rsi: $(src)/%.rs FORCE
quiet_cmd_rustc_s_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
cmd_rustc_s_rs = \
- $(rust_common_cmd) --emit=dep-info,asm $<; \
+ $(rust_common_cmd) --emit=asm=$@ $<; \
$(rust_handle_depfile)
$(obj)/%.s: $(src)/%.rs FORCE
@@ -327,7 +327,7 @@ $(obj)/%.s: $(src)/%.rs FORCE
quiet_cmd_rustc_ll_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
cmd_rustc_ll_rs = \
- $(rust_common_cmd) --emit=dep-info,llvm-ir $<; \
+ $(rust_common_cmd) --emit=llvm-ir=$@ $<; \
$(rust_handle_depfile)
$(obj)/%.ll: $(src)/%.rs FORCE
diff --git a/scripts/Makefile.host b/scripts/Makefile.host
index da133780b751..4434cdbf7b8e 100644
--- a/scripts/Makefile.host
+++ b/scripts/Makefile.host
@@ -84,8 +84,8 @@ _hostc_flags = $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
$(HOSTCFLAGS_$(target-stem).o)
_hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
$(HOSTCXXFLAGS_$(target-stem).o)
-_hostrust_flags = $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \
- $(HOSTRUSTFLAGS_$(target-stem))
+hostrust_flags = $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \
+ $(HOSTRUSTFLAGS_$(target-stem)) --emit=dep-info=$(depfile)
# $(objtree)/$(obj) for including generated headers from checkin source files
ifeq ($(KBUILD_EXTMOD),)
@@ -97,7 +97,6 @@ endif
hostc_flags = -Wp,-MMD,$(depfile) $(_hostc_flags)
hostcxx_flags = -Wp,-MMD,$(depfile) $(_hostcxx_flags)
-hostrust_flags = $(_hostrust_flags)
#####
# Compile programs on the host
@@ -149,9 +148,7 @@ $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
# host-rust -> Executable
quiet_cmd_host-rust = HOSTRUSTC $@
cmd_host-rust = \
- $(HOSTRUSTC) $(hostrust_flags) --emit=dep-info,link \
- --out-dir=$(obj)/ $<; \
- mv $(obj)/$(target-stem).d $(depfile); \
+ $(HOSTRUSTC) $(hostrust_flags) --emit=link=$@ $<; \
sed -i '/^\#/d' $(depfile)
$(host-rust): $(obj)/%: $(src)/%.rs FORCE
$(call if_changed_dep,host-rust)
--
2.34.1
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