HelloWorld and rusthelloworld in Rust Language

HelloWorld and rusthelloworld in Rust Language
HelloWorld of Rust Language

Reference:

Http://doc.crates.io/guide.html

1. What is Cargo?

Similar to maven/ant in java, automake in c, and Cargo is a rust project management tool. Use Cargo to do four things:

1) Configuration Management

2) download project Dependencies

3) Call the compiler rustc to compile and release the program.

4) In short, the development of rust's package solution

When you install rust, cargo will install it.

2. Create the first rust program HelloWorld

$ cargo new hello_world --bin

Check the directory structure:

$ cd hello_world$ tree ..├── Cargo.toml└── src    └── main.rs1 directory, 2 files

Compile and run it:

$ cargo build$ ./target/debug/hello_worldHello, world!

Or:

$ cargo run

Running 'target/debug/hello_world'

Hello, world!

Compile the release version:

$ cargo build --release

Program generated:

Target/release/hello_world

3 release to server

I compiled it on the development machine (Ubuntu14.04). Now I release it to the RHEL6 server and then run:

[root@vm-repo ~]# ./hello_world

./Hello_world:/lib64/libc. so.6: version 'glibc _ 2.14 'not found (required by./hello_world)
./Hello_world:/lib64/libc. so.6: version 'glibc _ 2.18 'not found (required by./hello_world)

Apparently, the GLIBC of my RHEL6 is too old. Check it out:

[root@vm-repo ~]# strings /lib64/libc.so.6 |grep GLIBC_

...
GLIBC_2.4
GLIBC_2.5
GLIBC_2.6
GLIBC_2.7
GLIBC_2.8
GLIBC_2.9
GLIBC_2.10
GLIBC_2.11
GLIBC_2.12

GLIBC_PRIVATE

4 upgrade server GLIBC (failed) 1) download glibc (http://ftp.gnu.org/gnu/libc)

wget -c http://ftp.gnu.org/gnu/libc/glibc-2.22.tar.gz

2) unzip and install

# tar zxf glibc-2.22.tar.gz# cd glibc-2.22# mkdir build# cd build# ../configure# make -j4# make install

...

Checking for gawk... gawk

Checking version of gawk... 3.1.7, OK
Checking if gcc is sufficient to build libc... no
Checking for nm... nm
Configure: error:
* ** These critical programs are missing or too old: as ld compiler
* ** Check the INSTALL file for required versions.

It seems that the gcc version of RHEL6 is too low. You need to upgrade gcc. It's too hard to give up.

5. Directly Mount rust on RHEL6 (successful)

# curl -f -L https://static.rust-lang.org/rustup.sh -O# sh rustup.sh

[Root @ vm-repo experiment] # rustc -- version
Rustc 1.2.0 (082e47636 2015-08-03)

Then recreate hello_world:

# cargo new hello_world --bin# cd hello_world# cargo build --release

The generated target/release/hello_world can be run!

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For more information, see

Http://doc.crates.io/guide.html

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