[GSoC'19] Parallelize GCC with Threads -- Second Evaluation Status

[Giuliano Belinassi]

Hi all,

Here is my second evaluation report, together with a simple program that
I was able to compile with my parallel version of GCC. Keep in mind that
I still have lots of concurrent issues inside the compiler and therefore
my branch will fail to compile pretty much anything else.

To reproduce my current branch, use the following steps:

1-) Clone https://gitlab.com/flusp/gcc/tree/giulianob_parallel

2-) Edit gcc/graphunit.c's variable `num_threads` to 1.

3-) Compile with --disable-bootstrap --enable-languages=c

4-) make

5-) Edit gcc/graphunit.c's variable `num_threads` to 2, for instance.

6-) make install DESTDIR="somewhere_else_that_doesnt_break_your_gcc"

7-) compile the program using -O2

I a attaching my report in markdown format, which you can convert to pdf
using `pandoc` if you find it difficult to read in the current format.

I am also open to suggestions. Please do not hesitate to comment :)

Thank you,
Giuliano.
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