[llvm-bugs] [Bug 28732] New: inline function - call without implementation

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28732

            Bug ID: 28732
           Summary: inline function - call without implementation
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: regis.portalez at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 16816
  --> https://llvm.org/bugs/attachment.cgi?id=16816&action=edit
resulting llvm IR

I'm using clang 3.8 (built for x64 in release mode with visual 2015 on windows
10) on windows, compiling for linux target. 

the compilation line is the following: 


clang -g -S -emit-llvm -x c -std=c99 -target i686-pc-linux -o zou.ll -c main.c


in the resulting ll, there is a call to method which is declared but has no
implementation. 

the input c code is : 

extern void exit (int);

inline void f (int x) {}

int main ()
{
  f (7);
  exit (0);
}

and the resulting ll (full version attached): 

; Function Attrs: nounwind
define i32 @main() #0 !dbg !4 {
  %1 = alloca i32, align 4
  store i32 0, i32* %1, align 4
  call void @f(i32 7), !dbg !11
  call void @exit(i32 0) #3, !dbg !12
  unreachable, !dbg !12
                                                  ; No predecessors!
  %3 = load i32, i32* %1, align 4, !dbg !13
  ret i32 %3, !dbg !13
}

declare void @f(i32) #1


PS: it seems to happen when compiling from linux to linux as well

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