Hi Przemek --
Thanks for pointing out this bug. If you'd be willing to file a GitHub
issue against it on our repo, that would be great.
The workaround I was going to suggest was the one it appears you've
already tried: using multiple ccflags options to "stack" the flags You
_might_ also try using the CHPL_CC_FLAGS environment variable to see if
that works any better (I don't have an llvm-enabled version of the
compiler handy and am trying not to work this weekend, so haven't tried it
myself. But I wouldn't be surprised if it had the same problem.
The variable used within the compiler to store this option is 'ccflags'
which has a very small number of references in the compiler -- most
related to setting it up while parsing arguments. I believe the uses in
compiler/util/clangUtil.cpp are where the llvm back-end uses it and the
code in compiler/util/files.cpp is where the C back-end does.
Unfortunately, a quick look suggests that there isn't some pre-existing "C
back-end parses the string" code to re-use because in that case we're
dumping the string into a generated Makefile, and I think it's the 'make'
logic that teases things apart. So it's likely that new code would have
to be written in clangUtil.cpp -- (or maybe in the representation of
ccflags itself?) -- in order to fix this issue.
That's based on a really quick look at the code, though, so I may well be
missing something else.
-Brad
On Sat, 4 Mar 2017, Przemek Leśniak wrote:
There is a problem associated with passing options to backend C compiler
when it is clang (in case of gcc this works fine). Clang receives options
as one string being concatenation of all options and doesn't parse this.
chpl --ccflags "-mllvm -use-cfl-aa" --llvm test.chpl
and
chpl --ccflags -mllvm --ccflags -use-cfl-aa --llvm test.chpl
Give:
error: unknown argument: '-mllvm -use-cfl-aa'
Note that I have to use --llvm flag so that the backend compiler becomes
clang (it's gcc without this flag).
chpl --ccflags "-mllvm -use-cfl-aa" test.chpl
Gives:
gcc: error: unrecognized command line option ‘-mllvm’
Which is fine.
I checked both gcc and clang compiler errors just to make sure:
gcc "-mllv -use-cfl-aa"
gcc: error: unrecognized command line option ‘-mllv -use-cfl-aa’
clang "-mllv -use-cfl-aa"
clang: error: unknown argument: '-mllv -use-cfl-aa'
Is there any workaround?
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