[Buildroot] [Patch v7 06/10] rust: new package
Eric Le Bihan
eric.le.bihan.dev at free.fr
Sun Jul 23 08:12:02 UTC 2017
This new package provides rustc, the compiler for the Rust programming
language, built from source.
Currently, only the host variant is built.
The Rust compiler uses LLVM as its backend: a copy of LLVM source code
is provided and CMake is used to build it. It is possible to use a
pre-built external copy. When LLVM/clang will be available in Buildroot,
it would be possible to benefit from this feature and thus decrease
build time.
LLVM is configured to generate code for x86, ARM, PowerPC and MIPS
architectures.
The Rust compiler uses Cargo as its build system and is written in Rust.
Therefore this package depends on cargo-bootstrap and rust-bootstrap.
The internal build process is as follows:
1. rustc-stage0, provided by rust-bootstrap, is used to build
rustc-stage1.
2. rust-stage1 builds the final Rust compiler (rust-stage2)
and the standard library for the host architecture.
3. the standard library for the target architecture is built.
The target architecture to support is given by the GNU/LLVM target
triple. Rust supports some predefined targets [1]. As the build system
expects the triple to be in the form of <arch>-unknown-<system> and
Buildroot toolchain wrapper uses <arch>-buildroot-<system>, the package
Makefile uses $(RUST_TARGET_NAME) defined in the rustc package and uses
it instead of $(GNU_TARGET_NAME).
When compiling Rust code with this compiler, the generated program only
depends on the target C library, as it is statically linked to the Rust
standard library and any other code from Rust packages (a.k.a.
"crates").
If the jemalloc package is selected, support for this memory allocator
will be enabled in the target standard library.
The menuconfig entry for rustc is also updated to expose this provider.
[1] https://forge.rust-lang.org/platform-support.html
Signed-off-by: Eric Le Bihan <eric.le.bihan.dev at free.fr>
---
DEVELOPERS | 1 +
package/rust/rust.hash | 2 ++
package/rust/rust.mk | 78 ++++++++++++++++++++++++++++++++++++++++++++
package/rustc/Config.in.host | 15 +++++++++
4 files changed, 96 insertions(+)
create mode 100644 package/rust/rust.hash
create mode 100644 package/rust/rust.mk
diff --git a/DEVELOPERS b/DEVELOPERS
index ca0657f..008a569 100644
--- a/DEVELOPERS
+++ b/DEVELOPERS
@@ -496,6 +496,7 @@ F: package/jemalloc/
F: package/ninja/
F: package/rust-bin/
F: package/rust-bootstrap/
+F: package/rust/
F: package/s6/
F: package/s6-dns/
F: package/s6-linux-init/
diff --git a/package/rust/rust.hash b/package/rust/rust.hash
new file mode 100644
index 0000000..d75b7b7
--- /dev/null
+++ b/package/rust/rust.hash
@@ -0,0 +1,2 @@
+# Locally generated
+sha256 392148ab52db6299c46df6f48f066b7bdf9a7af9775fb05571984ff500f7f9ad rustc-1.19.0-src.tar.xz
diff --git a/package/rust/rust.mk b/package/rust/rust.mk
new file mode 100644
index 0000000..fb83b72
--- /dev/null
+++ b/package/rust/rust.mk
@@ -0,0 +1,78 @@
+################################################################################
+#
+# rust
+#
+################################################################################
+
+RUST_VERSION = 1.19.0
+RUST_SOURCE = rustc-$(RUST_VERSION)-src.tar.xz
+RUST_SITE = https://static.rust-lang.org/dist
+RUST_LICENSE = Apache-2.0 or MIT
+RUST_LICENSE_FILES = LICENSE-APACHE LICENSE-MIT
+
+HOST_RUST_PROVIDES = host-rustc
+
+HOST_RUST_DEPENDENCIES = \
+ toolchain \
+ host-rust-bootstrap \
+ host-cargo-bootstrap \
+ host-python \
+ host-cmake
+
+ifeq ($(BR2_PACKAGE_JEMALLOC),y)
+HOST_RUST_DEPENDENCIES += jemalloc
+HOST_RUST_JEMALLOC_ENABLED = true
+HOST_RUST_JEMALLOC_CONF = 'jemalloc = "$(STAGING_DIR)/usr/lib/libjemalloc_pic.a"'
+else
+HOST_RUST_JEMALLOC_ENABLED = false
+endif
+
+HOST_RUST_VERBOSITY = $(if $(VERBOSE),2,0)
+
+define HOST_RUST_CONFIGURE_CMDS
+ (cd $(@D); \
+ echo '[build]' > config.toml; \
+ echo 'target = ["$(RUST_TARGET_NAME)"]' >> config.toml; \
+ echo 'cargo = "$(HOST_CARGO_BOOTSTRAP_DIR)/cargo/bin/cargo"' >> config.toml; \
+ echo 'rustc = "$(HOST_RUST_BOOTSTRAP_DIR)/rustc/bin/rustc"' >> config.toml; \
+ echo 'python = "$(HOST_DIR)/bin/python2"' >> config.toml; \
+ echo 'submodules = false' >> config.toml; \
+ echo 'vendor = true' >> config.toml; \
+ echo 'compiler-docs = false' >> config.toml; \
+ echo 'docs = false' >> config.toml; \
+ echo 'verbose = $(HOST_RUST_VERBOSITY)' >> config.toml; \
+ echo '[install]' >> config.toml; \
+ echo 'prefix = "$(HOST_DIR)"' >> config.toml; \
+ echo '[rust]' >> config.toml; \
+ echo 'use-jemalloc = $(HOST_RUST_JEMALLOC_ENABLED)' >> config.toml; \
+ echo '[target.$(RUST_TARGET_NAME)]' >> config.toml; \
+ echo 'cc = "$(TARGET_CROSS)gcc"' >> config.toml; \
+ echo 'cxx = "$(TARGET_CROSS)g++"' >> config.toml; \
+ echo $(HOST_RUST_JEMALLOC_CONF) >> config.toml; \
+ )
+endef
+
+define HOST_RUST_BUILD_CMDS
+ (cd $(@D); $(HOST_MAKE_ENV) $(HOST_RUST_MAKE_ENV) python2 x.py \
+ build $(HOST_RUST_BUILD_OPTS))
+endef
+
+define HOST_RUST_INSTALL_LIBSTD_TARGET
+ (cd $(@D)/build/tmp/dist/rust-std-$(RUST_VERSION)-dev-$(RUST_TARGET_NAME); \
+ ./install.sh \
+ --prefix=$(HOST_DIR) \
+ --docdir=$(HOST_DIR)/share/doc/rust \
+ --libdir=$(HOST_DIR)/lib \
+ --mandir=$(HOST_DIR)/share/man \
+ --disable-ldconfig)
+endef
+
+define HOST_RUST_INSTALL_CMDS
+ (cd $(@D); $(HOST_MAKE_ENV) $(HOST_RUST_MAKE_ENV) python2 x.py \
+ dist $(HOST_RUST_BUILD_OPTS))
+ (cd $(@D); $(HOST_MAKE_ENV) $(HOST_RUST_MAKE_ENV) python2 x.py \
+ install $(HOST_RUST_BUILD_OPTS))
+ $(HOST_RUST_INSTALL_LIBSTD_TARGET)
+endef
+
+$(eval $(host-generic-package))
diff --git a/package/rustc/Config.in.host b/package/rustc/Config.in.host
index 7f2c276..30bab8f 100644
--- a/package/rustc/Config.in.host
+++ b/package/rustc/Config.in.host
@@ -26,6 +26,20 @@ choice
help
Choose a provider for the Rust compiler.
+config BR2_PACKAGE_HOST_RUST
+ bool "host rust"
+ depends on BR2_HOST_GCC_AT_LEAST_4_7 # required by LLVM
+ # triggers ICE on trunc_int_for_mode, at explow.c:56
+ depends on BR2_TOOLCHAIN_GCC_AT_LEAST_5 || !BR2_aarch64
+ select BR2_PACKAGE_HAS_HOST_RUSTC
+ help
+ This package will build the compiler for the host as well as
+ a cross-compiled version of the Rust standard library for the
+ target.
+
+comment "host-rust needs a toolchain w/ gcc >= 5"
+ depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_5 && BR2_aarch64
+
config BR2_PACKAGE_HOST_RUST_BIN
bool "host rust (pre-built)"
select BR2_PACKAGE_HAS_HOST_RUSTC
@@ -40,6 +54,7 @@ config BR2_PACKAGE_HAS_HOST_RUSTC
config BR2_PACKAGE_PROVIDES_HOST_RUSTC
string
+ default "host-rust" if BR2_PACKAGE_HOST_RUST
default "host-rust-bin" if BR2_PACKAGE_HOST_RUST_BIN
endif
--
2.9.4
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