zmodem wrote:
Maybe that's the best place to approach this from. Consider:
```
float f(float x, float y) {
return __builtin_hypotf(x, y);
}
```
Compiling (on Windows) with `clang -Os -S -emit-llvm -target i686-pc-win32 -o -
\src\temp\a.c -D_MT -D_DLL` gives
```
; Function Attrs: nounwind optsize
define dso_local float @f(float noundef %0, float noundef %1)
local_unnamed_addr #0 {
%3 = tail call float @hypotf(float noundef %0, float noundef %1) #2
ret float %3
}
; Function Attrs: nounwind optsize
declare dso_local float @hypotf(float noundef, float noundef)
local_unnamed_addr #1
```
if we include `math.h` first:
```
#include <math.h>
float f(float x, float y) {
return __builtin_hypotf(x, y);
}
```
I get:
```
; Function Attrs: nounwind optsize
define dso_local float @f(float noundef %0, float noundef %1)
local_unnamed_addr #0 {
%3 = tail call float @_hypotf(float noundef %0, float noundef %1) #2,
!inline_history !6
ret float %3
}
; Function Attrs: optsize
declare dllimport float @_hypotf(float noundef, float noundef)
local_unnamed_addr #1
```
I think we want the latter result regardless of whether the header was
included. The modules issue is just a more complicated version of the same
problem.
https://github.com/llvm/llvm-project/pull/204792
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