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| author | Masahiro Yamada <masahiroy@kernel.org> | 2023-01-07 10:18:15 +0100 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2023-01-22 15:43:33 +0100 |
| commit | 295d8398c67e314d99bb070f38883f83fe94a97a (patch) | |
| tree | 5945c21812366421be7d3762bbac91731b8fd5b2 /scripts/Makefile.host | |
| parent | kbuild: refactor host*_flags (diff) | |
| download | linux-295d8398c67e314d99bb070f38883f83fe94a97a.tar.xz linux-295d8398c67e314d99bb070f38883f83fe94a97a.zip | |
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$(nproc) samples/rust/rust_minimal.o samples/rust/rust_minimal.rsi \
samples/rust/rust_minimal.s samples/rust/rust_minimal.ll
[snip]
RUSTC [M] samples/rust/rust_minimal.o
RUSTC [M] samples/rust/rust_minimal.rsi
RUSTC [M] samples/rust/rust_minimal.s
RUSTC [M] samples/rust/rust_minimal.ll
mv: cannot stat 'samples/rust/rust_minimal.d': No such file or directory
make[3]: *** [scripts/Makefile.build:334: samples/rust/rust_minimal.ll] Error 1
make[3]: *** Waiting for unfinished jobs....
mv: cannot stat 'samples/rust/rust_minimal.d': No such file or directory
make[3]: *** [scripts/Makefile.build:309: samples/rust/rust_minimal.o] Error 1
mv: cannot stat 'samples/rust/rust_minimal.d': No such file or directory
make[3]: *** [scripts/Makefile.build:326: samples/rust/rust_minimal.s] Error 1
make[2]: *** [scripts/Makefile.build:504: samples/rust] Error 2
make[1]: *** [scripts/Makefile.build:504: samples] Error 2
make: *** [Makefile:2008: .] Error 2
The reason for the error is that 4 threads running in parallel renames
the same file, samples/rust/rust_minimal.d.
This does not happen when compiling C or assembly files because
-Wp,-MMD,$(depfile) explicitly specifies the dependency filepath.
$(depfile) is a unique path for each target.
Currently, rustc is only given --out-dir and --emit=<list-of-types>
So, all the rust build rules output the dep-info into the default
<CRATE_NAME>.d, which causes the path conflict.
Fortunately, the --emit option is able to specify the output path
individually, with the form --emit=<type>=<path>.
Add --emit=dep-info=$(depfile) to the common part. Also, remove the
redundant --out-dir because the output path is specified for each type.
The code gets much cleaner because we do not need to rename *.d files.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Miguel Ojeda <ojeda@kernel.org>
Tested-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Diffstat (limited to 'scripts/Makefile.host')
| -rw-r--r-- | scripts/Makefile.host | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/scripts/Makefile.host b/scripts/Makefile.host index 4a02b31cd102..d812241144d4 100644 --- a/scripts/Makefile.host +++ b/scripts/Makefile.host @@ -86,7 +86,8 @@ hostc_flags = -Wp,-MMD,$(depfile) \ hostcxx_flags = -Wp,-MMD,$(depfile) \ $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ $(HOSTCXXFLAGS_$(target-stem).o) -hostrust_flags = $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \ +hostrust_flags = --emit=dep-info=$(depfile) \ + $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \ $(HOSTRUSTFLAGS_$(target-stem)) # $(objtree)/$(obj) for including generated headers from checkin source files @@ -147,9 +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) |