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[ghost] Fixes error msg for ignored ghost-else

See merge request frama-c/frama-c!2604

[Libc] improve C99/POSIX compatibility

See merge request frama-c/frama-c!2313

small parser fixes

Closes #637

See merge request frama-c/frama-c!2601

[Eva] New alarms for the creation of invalid pointers

Closes #812 and #625

See merge request frama-c/frama-c!2555

original issue introduced here: b9a1eb43

Virgile Prevosto authored Mar 25, 2020 and David Bühler committed Mar 27, 2020

so that Eva won't raise an alarm on them.

Avoid warning about missing proto during typechecking.
Also changes a warning into an error, and improves the error message.

According to the kernel option -warn-invalid-pointer.

In order to avoid an undefined behavior in the C code generated for this macro
(conversion from an absolute integer to a pointer).

When -absolute-valid-range is enabled, the Null base has a Known validity,
but a pointer can always points to Null+{0}.

Complies with the kernel option -warn-invalid-pointers.

[typing] Do not inline inner block if previous statement is a code annotation applying to its whole next statement

Closes #836

See merge request frama-c/frama-c!2587

New option for pointer downcast alarms

Closes #777

See merge request frama-c/frama-c!2557

New smart constructor for TCastE in logic_const.

[Instantiate] Fix different failures

See merge request frama-c/frama-c!2592