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For compatibility with the upcoming Coq 8.14.
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Since Coq 8.12, `omega` is flagged as deprecated and scheduled for removal.
Also replace CompCert's homemade tactics `omegaContradiction`, `xomega`,
and `xomegaContradiction` with `lia` and `extlia`.
Turn back on the deprecation warning for uses of `omega`.
Make the proof of `Ctypes.sizeof_pos` more robust to variations in `lia`.
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Main changes to CompCert outside of Flocq are as follows:
- Minimal supported version of Coq is now 8.7, due to Flocq requirements.
- Most modifications are due to Z2R being dropped in favor of IZR and to
the way Flocq now handles NaNs.
- CompCert now correctly handles NaNs for the Risc-V architecture
(hopefully).
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We were previously at 2.5.2. Quoting the NEWS from upstream:
Version 2.6.1:
- ensured compatibility from Coq 8.4 to 8.8
Version 2.6.0:
- ensured compatibility from Coq 8.4 to 8.7
- removed some hypotheses on some lemmas of Fcore_ulp
- added lemmas to Fprop_plus_error
- improved examples
Also: in preparation for Coq 8.8, silence warning "compatibility-notation"
when building Flocq, because this warning is on by default in 8.8,
and Flocq triggers it a lot.
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Implicit Arguments is deprecated in Coq since 8.6 or so.
Some Implicit Arguments remained in Flocq but were recently changed to Arguments.
Apply the same change to our local copy of Flocq.
As a positive consequence, we no longer need to suppress the deprecation warnings while compiling Flocq.
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This commit is mainly a squash of the relevant compatibility commits from
Flocq's master. Most of the changes are meant to make the proofs oblivious
to the way constants such as 0, 1, 2, and -1 are represented.
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This version of Flocq is compatible with Coq 8.6
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Note: this version of Flocq is compatible with both Coq 8.4 and 8.5.
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More precise modeling of NaNs.
git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2303 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
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git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1939 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
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