Commits on Sep 28, 2016

1. Add a script to compare two compilers. …

   This commit adds a new script, `compare.py`, that can be used to compared the
   speed of two compilers. Example output:
   ```
   futures-rs-test  4.689s vs  4.668s --> 1.004x faster (variance: 1.001x, 1.008x)
   helloworld       0.232s vs  0.230s --> 1.007x faster (variance: 1.009x, 1.012x)
   html5ever-2016-  7.670s vs  7.669s --> 1.000x faster (variance: 1.008x, 1.009x)
   hyper.0.5.0      5.304s vs  5.308s --> 0.999x faster (variance: 1.007x, 1.005x)
   inflate-0.1.0    4.849s vs  4.884s --> 0.993x faster (variance: 1.019x, 1.009x)
   issue-32062-equ  0.400s vs  0.396s --> 1.009x faster (variance: 1.014x, 1.021x)
   issue-32278-big  1.872s vs  1.833s --> 1.022x faster (variance: 1.021x, 1.018x)
   jld-day15-parse  1.903s vs  1.875s --> 1.015x faster (variance: 1.006x, 1.002x)
   piston-image-0. 12.910s vs 12.932s --> 0.998x faster (variance: 1.010x, 1.006x)
   regex.0.1.30     2.622s vs  2.629s --> 0.997x faster (variance: 1.020x, 1.018x)
   rust-encoding-0  3.269s vs  3.245s --> 1.007x faster (variance: 1.022x, 1.022x)
   syntex-0.42.2    0.240s vs  0.242s --> 0.992x faster (variance: 1.011x, 1.004x)
   syntex-0.42.2-i 48.252s vs 48.070s --> 1.004x faster (variance: 1.011x, 1.006x)
   ```
   
   In support of this, the commit also does the following.
   
   - Clarifies the meaning of the `touch` target. It now touches or removes
     files in such a way that subsequent `make` invocations will rebuild
     just the crate of interest for each benchmark. Most of the `touch`
     targets required changing to achieve this.
   
   - Replaces use of the CARGO_BUILD environment variable with
     CARGO_RUSTC_OPTS. This means that all makefiles are now more uniform
     -- they now all invoke `cargo rust` directly, and none of them
     specify `-Ztime-passes -Zinput-stats`. The commit also updates
     appropriately `process.sh` for this change.
   
   - Uses `cargo clean` more extensively in makefile `clean` targets.
   
   - Adds `.PHONY` declarations to all makefiles missing them. It can't
     hurt.
   
   - Rewrites `README.md` to reflect all the above changes, and to remove
     outdated and incorrect information.

   

   nnethercote committed Sep 28, 2016
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2. lock syntex version

   

   nikomatsakis committed Sep 28, 2016
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3. update the syntex-0.42.2 makefiles …

   We are now timing specifically the syntex_syntax crate. Also, do not
   remove the Cargo.lock file -- I want to ensure we continue to build the
   same dependencies so our measurements are more reliable.

   

   nikomatsakis committed Sep 28, 2016
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4. Merge pull request #1 from nikomatsakis/fix-syntex-benchmarks …

   Fix syntex benchmarks

   

   nnethercote committed Sep 28, 2016
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