[tautschnig]

GCC and Clang provide __builtin_X for the C library functions X with X's meaning (GCC manual, "Other Built-in Functions Provided by GCC"). The library modelled only a few of them (__builtin_fabs, ...); libc++'s calls __builtin_ceilf, __builtin_sqrt, ... and those had no body. get_cprover_library_text now gives a requested __builtin_X without a model of its own the model of X, with X renamed (as a whole word, outside #include lines). Models taking a va_list are not reused: where va_list is a struct (aarch64), the model's parameter type differs from the __builtin_va_list of a declaration, and linking left the model's va_list typedef unresolved.

New test cbmc/gcc_builtin_library_functions.

• Each commit message has a non-empty body, explaining why the change was made.
• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

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[codecov]

Codecov Report

❌ Patch coverage is 98.07692% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.03%. Comparing base (826c1c7) to head (25ef6df).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/ansi-c/cprover_library.cpp	98.07%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #9434   +/-   ##
========================================
  Coverage    81.02%   81.03%           
========================================
  Files         1723     1723           
  Lines       191314   191366   +52     
  Branches        73       73           
========================================
+ Hits        155020   155070   +50     
- Misses       36294    36296    +2     

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