https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69759

            Bug ID: 69759
           Summary: __builtin_alloca undocumented
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: msebor at gcc dot gnu.org
  Target Milestone: ---

Documentation for the __builtin_alloca intrinsic function appears to be missing
from the manual:

$ find /src/gcc/trunk/gcc/doc -type f | xargs grep builtin_alloca | wc -l
0

The builtin is relied on by GCC itself (e.g., libstdc++) as well as other
projects (e.g., GLIBC), and is even mentioned on the Linux alloca() man page:
http://man7.org/linux/man-pages/man3/alloca.3.html

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