# compile error building master with intel compiler
**URL:** https://discourse.vtk.org/t/compile-error-building-master-with-intel-compiler/5708
**Category:** Development
**Created:** [May 5, 2021, 11:25am UTC](https://discourse.vtk.org/t/compile-error-building-master-with-intel-compiler/5708 "2021-05-05T11:25:11Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@andreasbuykx](https://discourse.vtk.org/u/andreasbuykx)
#### Post date: [May 5, 2021, 11:25am UTC](https://discourse.vtk.org/t/compile-error-building-master-with-intel-compiler/5708/1 "2021-05-05T11:25:11Z")
I’m trying to build master on centos-7 with intel icc (ICC) 19.1.1.217 20200306 and I get this compile error:
```
Filters/Sources/vtkPlaneSource.cxx(405): error: more than one instance of overloaded function "abs" matches the argument list:
function "abs(int)"
function "std::abs(long long)"
function "std::abs(long)"
argument types are: (double)
if (abs(angle) < EPSILON)
^
```
Can I safely change abs into std::abs?
---
### Author:  [@danlipsa](https://discourse.vtk.org/u/danlipsa)
#### Post date: [May 5, 2021, 1:14pm UTC](https://discourse.vtk.org/t/compile-error-building-master-with-intel-compiler/5708/2 "2021-05-05T13:14:37Z")
std::fabs seems appropriate here. Please consider submitting a patch
[https://gitlab.kitware.com/vtk/vtk/blob/master/Documentation/dev/git/develop.md](https://gitlab.kitware.com/vtk/vtk/blob/master/Documentation/dev/git/develop.md)
---
### Author:  [@seanm](https://discourse.vtk.org/u/seanm)
#### Post date: [May 5, 2021, 3:37pm UTC](https://discourse.vtk.org/t/compile-error-building-master-with-intel-compiler/5708/3 "2021-05-05T15:37:06Z")
Please also consider submitting a nightly build to [https://open.cdash.org/index.php?project=VTK](https://open.cdash.org/index.php?project=VTK) It seems there are no icc builds there, and without one, such errors are bound to return.
---
### Author:  [@Thomas\_Caissard](https://discourse.vtk.org/u/Thomas_Caissard)
#### Post date: [May 5, 2021, 3:38pm UTC](https://discourse.vtk.org/t/compile-error-building-master-with-intel-compiler/5708/4 "2021-05-05T15:38:24Z")
As the input is a `double`, `fabs` shouldn’t be used here. In any case, `std::abs` is better since it provides the proper `double` overload (see [here](https://en.cppreference.com/w/cpp/numeric/math/fabs)).
---
### Author:  [@danlipsa](https://discourse.vtk.org/u/danlipsa)
#### Post date: [May 5, 2021, 3:45pm UTC](https://discourse.vtk.org/t/compile-error-building-master-with-intel-compiler/5708/5 "2021-05-05T15:45:10Z")
Yes indeed, std::abs is fine. (interestingly std::fabs has a double override as well)
---
### Author:  [@dgobbi](https://discourse.vtk.org/u/dgobbi)
#### Post date: [May 5, 2021, 7:49pm UTC](https://discourse.vtk.org/t/compile-error-building-master-with-intel-compiler/5708/6 "2021-05-05T19:49:55Z")
> [@Thomas\_Caissard](#):
>
> As the input is a `double`, `fabs` shouldn’t be used here.
Wait, what? Both `fabs()` and `std::fabs()` are fine with double.
---
### Author:  [@andreasbuykx](https://discourse.vtk.org/u/andreasbuykx)
#### Post date: [May 6, 2021, 11:31am UTC](https://discourse.vtk.org/t/compile-error-building-master-with-intel-compiler/5708/7 "2021-05-06T11:31:07Z")
Is there some documentation available on what this means in terms of workload for involved machines, and what kind of maintenance effort is needed to the keep the build process alive? I can discuss this with my boss to see if my company is willing to do this but I couldn’t find any relevant information from the dashboard or project menu items to convince them with.
---
### Author:  [@Thomas\_Caissard](https://discourse.vtk.org/u/Thomas_Caissard)
#### Post date: [May 6, 2021, 11:38am UTC](https://discourse.vtk.org/t/compile-error-building-master-with-intel-compiler/5708/8 "2021-05-06T11:38:44Z")
Yep you’re right, for some reason I thought there was no `double` overload for `fabs` 🙂
---
### Author:  [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)
#### Post date: [May 15, 2021, 8:41pm UTC](https://discourse.vtk.org/t/compile-error-building-master-with-intel-compiler/5708/9 "2021-05-15T20:41:23Z")
FWIW, we’re working on Intel CI runs in [this MR](https://gitlab.kitware.com/vtk/vtk/-/merge_requests/7981).