make and make -j4 have different behavior in compiling

[xuzhao9]

I am using rust-nightly.tar.gz.
When I run make -j4, it tries to download a stage0 file from rust-server.
Filename: rust-stage0-2014-05-16-5327218-linux-x86_64-212f9062080a6e6cba472d8530d086ad787bbf72.tar.bz2

However when I run make, it does not do so. Compiling does not need to fetch a pre-build stage0 file. Everything is local.

Is it supposed to be a correct behavior?

[xuzhao9]

The make command also need to fetch stage0 file. It is just slower.

Sorry for my mistake.

[ghost]

I'm stuck having to run with -j1 or else(with -j4) this error keeps happening

...
cfg: disabling valgrind run-pass tests
rustc: x86_64-unknown-linux-gnu/stage0/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore
rustdoc: doc/not_found.html
/bin/sh: x86_64-unknown-linux-gnu/stage2/bin/rustdoc: No such file or directory
/home/zazdxscf/build/1nonpkgs/rust/rust/mk/docs.mk:123: recipe for target 'doc/not_found.html' failed
make: *** [doc/not_found.html] Error 127
make: *** Waiting for unfinished jobs....
time: 0.227; rss: 44MB  parsing
...

Seems to me that this part of the make should wait until rustdoc gets compiled. Or maybe we're not supposed to run with anything other than -j1. Ideas?

EDIT:

$ export MAKEFLAGS='-j4 '
$ make clean
...
$ ./configure --prefix=/home/zazdxscf/build/1nonpkgs/rust/usr/local --disable-rpath --enable-manage-submodules --disable-clang --enable-ccache --enable-dist-host-only --disable-valgrind --disable-helgrind --disable-valgrind-rpass --python=/usr/bin/python2 --enable-optimize --enable-optimize-cxx --enable-optimize-llvm --enable-debug --disable-debuginfo --enable-debug-assertions --enable-debuginfo-tests --enable-llvm-assertions --enable-debug-jemalloc --disable-local-rust --release-channel=dev --host=x86_64-unknown-linux-gnu --target=x86_64-unknown-linux-gnu --build=x86_64-unknown-linux-gnu
...
configure: writing configuration
configure: 
configure: CFG_SRC_DIR          := /home/zazdxscf/build/1nonpkgs/rust/ ...
configure: CFG_SRC_DIR_RELATIVE := ./ 
configure: CFG_BUILD_DIR        := /home/zazdxscf/build/1nonpkgs/rust/ ...
configure: CFG_OSTYPE           := unknown-linux-gnu 
configure: CFG_CPUTYPE          := x86_64 
configure: CFG_CONFIGURE_ARGS   := --prefix=/home/zazdxscf/build/1nonp ...
configure: CFG_PREFIX           := /home/zazdxscf/build/1nonpkgs/rust/ ...
configure: CFG_HOST             := x86_64-unknown-linux-gnu 
configure: CFG_TARGET           := x86_64-unknown-linux-gnu 
configure: CFG_LIBDIR_RELATIVE  := lib 
configure: CFG_DISABLE_MANAGE_SUBMODULES :=  
configure: CFG_AARCH64_LINUX_ANDROID_NDK :=  
configure: CFG_ARM_LINUX_ANDROIDEABI_NDK :=  
configure: CFG_I686_LINUX_ANDROID_NDK :=  
configure: CFG_MANDIR           := /home/zazdxscf/build/1nonpkgs/rust/ ...
configure: CFG_CCACHE_BASEDIR   := /home/zazdxscf/build/1nonpkgs/rust/ ...
configure: CFG_LLVM_SRC_DIR     := /home/zazdxscf/build/1nonpkgs/rust/ ...
configure: CFG_LLVM_BUILD_DIR_x86_64_unknown_linux_gnu := /home/zazdxscf/build/1nonpkgs/rust/ ...
configure: CFG_LLVM_INST_DIR_x86_64_unknown_linux_gnu := /home/zazdxscf/build/1nonpkgs/rust/ ...
configure: 
configure: leaving ./Makefile unchanged
configure: mv -f config.tmp config.mk
configure: 
configure: complete
configure: 
configure: run `make help`

$ time make -j4 -- VERBOSE=1 NO_REBUILD=1 TIME_PASSES=1 TIME_LLVM_PASSES=1 'RUSTFLAGS=--verbose -Z verbose -Z print-link-args -Z print-llvm-passes -Z verbose -C debug-assertions=y -Ccodegen-units=4' RUST_BACKTRACE=1
cfg: version 1.5.0-dev (9a855668f 2015-10-23)
cfg: build triple x86_64-unknown-linux-gnu
cfg: host triples x86_64-unknown-linux-gnu
cfg: target triples x86_64-unknown-linux-gnu
cfg: enabling debug assertions (CFG_ENABLE_DEBUG_ASSERTIONS)
cfg: host for x86_64-unknown-linux-gnu is x86_64
cfg: os for x86_64-unknown-linux-gnu is unknown-linux-gnu
cfg: good valgrind for x86_64-unknown-linux-gnu is 1
cfg: using CC=ccache gcc (CFG_CC)
cfg: disabling valgrind run-pass tests
...
LD_LIBRARY_PATH=/home/zazdxscf/build/1nonpkgs/rust/rust/x86_64-unknown-linux-gnu/stage2/lib:$LD_LIBRARY_PATH x86_64-unknown-linux-gnu/stage2/bin/rustdoc --html-before-content=doc/version_info.html --html-in-header=doc/favicon.inc --html-after-content=doc/footer.inc --markdown-playground-url='https://play.rust-lang.org/' --markdown-css rust.css  /home/zazdxscf/build/1nonpkgs/rust/rust/src/doc/grammar.md
/bin/sh: x86_64-unknown-linux-gnu/stage2/bin/rustdoc: No such file or directory
/home/zazdxscf/build/1nonpkgs/rust/rust/mk/docs.mk:138: recipe for target 'doc/grammar.html' failed
make: *** [doc/grammar.html] Error 127
make: *** Waiting for unfinished jobs....
...
real    3m54.500s
user    7m42.910s
sys 4m30.387s

Note that it stops after llvm compilation finishes.

[ghost]

It only fails when I pass NO_REBUILD=1 to make ! So both -j4 and NO_REBUILD=1 are required to fail like that.