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This adds support for _Alignas(expr) and _Alignas(type-name) from the C11 standard.

Currently, while this information is parsed it is not represented in the corresponding Cabs or CIL ASTs.

References #13.
Closes #93.

@michael-schwarz michael-schwarz added this to the 2.0.0 milestone Jul 22, 2022
@michael-schwarz michael-schwarz requested a review from sim642 July 22, 2022 14:58
@michael-schwarz michael-schwarz changed the title Support for _Alignas Support for _Alignas(...) Jul 22, 2022
@michael-schwarz michael-schwarz merged commit a8b4da7 into develop Jul 26, 2022
@michael-schwarz michael-schwarz deleted the issue_93 branch July 26, 2022 07:29
sim642 added a commit to sim642/opam-repository that referenced this pull request Aug 12, 2022
CHANGES:

* Wrap library into `GoblintCil` module (goblint/cil#107).
* Remove all MSVC support (goblint/cil#52, goblint/cil#88).
* Port entire build process from configure/make to dune (goblint/cil#104).
* Add C11 `_Generic` support (goblint/cil#48).
* Add C11 `_Noreturn` support (goblint/cil#58).
* Add C11 `_Static_assert` support (goblint/cil#62).
* Add C11 `_Alignof` support (goblint/cil#66).
* Add C11 `_Alignas` support (goblint/cil#93, goblint/cil#108).
* Add partial C11 `_Atomic` support (goblint/cil#61).
* Add `_Float32`, `_Float64`, `_Float32x` and `_Float64x` type support (goblint/cil#8, goblint/cil#60).
* Add Universal Character Names, `char16_t` and `char32_t` type support (goblint/cil#80).
* Change locations to location spans and add additional expression locations (goblint/cil#51).
* Add synthetic marking for CIL-inserted statement locations (goblint/cil#98).
* Expose list of files from line control directives (goblint/cil#73).
* Add parsed location transformation hook (goblint/cil#89).
* Use Zarith for integer constants (goblint/cil#47, goblint/cil#53).
* Fix constant folding overflows (goblint/cil#59).
* Add option to disable constant branch removal (goblint/cil#103).
* Add standalone expression parsing and checking (goblint/cil#97, goblint/cil#96).
* Improve inline function merging (goblint/cil#72, goblint/cil#85, goblint/cil#84, goblint/cil#86).
* Fix some attribute parsing cases (goblint/cil#71, goblint/cil#75, goblint/cil#76, goblint/cil#77).
* Fix global NaN initializers (goblint/cil#78, goblint/cil#79).
* Fix `cilly` binary installation (goblint/cil#99, goblint/cil#100, goblint/cil#102).
* Remove batteries dependency to support OCaml 5 (goblint/cil#106).
sim642 added a commit to sim642/opam-repository that referenced this pull request Aug 12, 2022
CHANGES:

* Wrap library into `GoblintCil` module (goblint/cil#107).
* Remove all MSVC support (goblint/cil#52, goblint/cil#88).
* Port entire build process from configure/make to dune (goblint/cil#104).
* Add C11 `_Generic` support (goblint/cil#48).
* Add C11 `_Noreturn` support (goblint/cil#58).
* Add C11 `_Static_assert` support (goblint/cil#62).
* Add C11 `_Alignof` support (goblint/cil#66).
* Add C11 `_Alignas` support (goblint/cil#93, goblint/cil#108).
* Add partial C11 `_Atomic` support (goblint/cil#61).
* Add `_Float32`, `_Float64`, `_Float32x` and `_Float64x` type support (goblint/cil#8, goblint/cil#60).
* Add Universal Character Names, `char16_t` and `char32_t` type support (goblint/cil#80).
* Change locations to location spans and add additional expression locations (goblint/cil#51).
* Add synthetic marking for CIL-inserted statement locations (goblint/cil#98).
* Expose list of files from line control directives (goblint/cil#73).
* Add parsed location transformation hook (goblint/cil#89).
* Use Zarith for integer constants (goblint/cil#47, goblint/cil#53).
* Fix constant folding overflows (goblint/cil#59).
* Add option to disable constant branch removal (goblint/cil#103).
* Add standalone expression parsing and checking (goblint/cil#97, goblint/cil#96).
* Improve inline function merging (goblint/cil#72, goblint/cil#85, goblint/cil#84, goblint/cil#86).
* Fix some attribute parsing cases (goblint/cil#71, goblint/cil#75, goblint/cil#76, goblint/cil#77).
* Fix global NaN initializers (goblint/cil#78, goblint/cil#79).
* Fix `cilly` binary installation (goblint/cil#99, goblint/cil#100, goblint/cil#102).
* Remove batteries dependency to support OCaml 5 (goblint/cil#106).
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Frontc parse error due to _Alignas(...)

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