[v3] check-compile

[Gabriel Dos Reis]

Benjamin Kosnik <bkoz@redhat.com> writes:

| Hey y'all.
| 
| This patch adds another specialized rule for checking: a "make check-compile" rule. 
| 
| This is just a shorthand make rule for compiling all the libstdc++ test
| files with a given TEST_FLAG, and not caring about linking or executing.
| 
| It's useful for timing the compiler, and also for syntax checking
| libstdc++  with extra warning flags, and the same with other compilers. 
| 
| tested x86/linux
| 
| Thoughts?

I'm all for this kind of check, i.e. compile-time regressions.

-- Gaby