Fork#41070: Please include libgccjit with MinGW GCC distribution
Open Date: 2020-12-23 17:28
Last Update: 2021-01-03 22:05
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/41070
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Last Changes/Comment on this Ticket:
2021-01-03 22:05 Updated by: keith
Comment:
With the previously posted series of patches, (20...22), augmenting the
pre-existing series for MinGW GCC-9.2.0, the libgccjit shared library sources
compile; however, they do not link, because they introduce an unresolved
dependency on pthreads mutexes.
While it would be technically feasible to include -lpthread within the link
operation, and so resolve this dependency, but, as noted in this mailing-list
message:
The dependency on pthreads is also unfortunate, as that many times
conflicts with w32api headers and creates build problems. It would
be good to avoid that dependency, if possible.
It arises because the JIT context is gratuitously guarded by a POSIX
mutex lock. Perhaps that could be converted to a Windows alternative,
(critical section, maybe); perhaps GCC-10 already does so, because the
patches you pointed me to do nothing to address this.
I think MinGW64 simply requires pthreads in all the GCC-related builds, we
had our share of problems stemming from that in Emacs development, when
MinGW64 users complained about that.
It should be very simple to replace a pthreads mutex lock with a critical
section, if GCC 10 didn't.
the dependency on a third-party pthreads mutex implementation does seem kind of
alien, on the Windows platform, when a native alternative would appear to be
entirely feasible.
FWIW, a cursory examination of the GCC-10 sources suggests that the pthreads
mutex dependency is still present, without change. Consequently, while not
entirely trivial, I have engineered a relatively simple replacement, in terms
of a native Windows CRITICAL_SECTION; it may be found in the attached
23-libgccjit-win32-no-pthreads.patch.
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Ticket Status:
Reporter: eliz
Owner: keith
Type: Feature Request
Status: Open [Owner assigned]
Priority: 5 - Medium
MileStone: (None)
Component: GCC
Severity: 5 - Medium
Resolution: None
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Ticket details:
Please add libgccjit to the binaries included in the MinGW GCC distributions.
This is required to be able to build projects that use libgccjit for JIT
compilation of code. One example of this is "gccemacs", a branch of GNU Emacs
development (soon to land on the master branch of Emacs) that compiles Emacs
Lisp programs into native x86 code for faster runtime performance.
Thank you.
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