[llvm-bugs] [Bug 27160] New: Clang 3.7 and 3.8: `undefined reference to (non-existent procedure)` error in C code

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27160

            Bug ID: 27160
           Summary: Clang 3.7 and 3.8: `undefined reference to
                    (non-existent procedure)` error in C code
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: afiskon at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

FreeBSD 10.2-RELEASE

project: PostgreSQL

How to reproduce an issue:

CC=/usr/local/bin/clang38 CFLAGS="-O0 -g" LDFLAGS="-lelf" ./configure
--enable-cassert --enable-debug --enable-dtrace && gmake clean && gmake -j2 -s

Ignore `passing 'const char *' to parameter of type 'char *' discards
qualifiers` warnings - it's an 8-years old bug in DTrace.

The actual problem is that build fails with following errors:

```
/usr/home/eax/postgresql-src/src/backend/access/transam/xact.c:501: undefined
reference to `bort'
access/transam/xact.o: In function `CommandCounterIncrement':
/usr/home/eax/postgresql-src/src/backend/access/transam/xact.c:935: undefined
reference to `bort'
/usr/home/eax/postgresql-src/src/backend/access/transam/xact.c:941: undefined
reference to `bort'
access/transam/xact.o: In function `StartTransactionCommand':
/usr/home/eax/postgresql-src/src/backend/access/transam/xact.c:2708: undefined
reference to `bort'
access/transam/xact.o: In function `CommitTransactionCommand':
/usr/home/eax/postgresql-src/src/backend/access/transam/xact.c:2739: undefined
reference to `bort'
```

There is no such procedure or variable in the whole project. My guess is that
it is "abort" without an "a".

Same issue reproduces with CLang 3.7. Same project compiles just find by GCC
4.9 and CLang 3.4.

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