Realm doesn't build when using Swift on Linux

[xit0c]

How frequently does the bug occur?

Always

Description

First of all, I'm not sure if this library is intended to be used outside of the Xcode/iOS/macOS environment so, if it's not, feel free to close this issue immediately.

That said, the issue is actually pretty straightforward: adding realm-swift to a Swift project on Linux breaks the build.

Stacktrace & log output

~/realm-demo$ swift build

Building for debugging...

In file included from ~/realm-demo/.build/checkouts/realm-core/src/external/s2/util/math/mathlimits.cc:6:
~/realm-demo/.build/checkouts/realm-core/src/external/s2/util/math/mathlimits.h:18:10: fatal error: 'cfloat' file not found
#include <cfloat>
         ^~~~~~~~
1 error generated.
In file included from ~/realm-demo/.build/checkouts/realm-core/src/external/s2/util/math/mathutil.cc:10:
~/realm-demo/.build/checkouts/realm-core/src/external/s2/util/math/mathlimits.h:18:10: fatal error: 'cfloat' file not found
#include <cfloat>
         ^~~~~~~~
In file included from ~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2latlng.cc:2:
~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2.h:10:10: fatal error: 'algorithm' file not found
#include <algorithm>
         ^~~~~~~~~~~
In file included from ~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2r2rect.cc:3:
In file included from ~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2r2rect.h:6:
In file included from ~/realm-demo/.build/checkouts/realm-core/src/external/s2/base/basictypes.h:9:
~/realm-demo/.build/checkouts/realm-core/src/external/s2/base/casts.h:16:10: fatal error: 'typeinfo' file not found
#include <typeinfo>         // for enumeration casts and tests
         ^~~~~~~~~~
~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2polyline.cc:3:10: fatal error: 'set' file not found
#include <set>
         ^~~~~
In file included from ~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2polygonbuilder.cc:3:
In file included from ~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2polygonbuilder.h:7:
~/realm-demo/.build/checkouts/realm-core/src/external/s2/hash.h:4:10: fatal error: 'unordered_map' file not found
#include <unordered_map>
         ^~~~~~~~~~~~~~~
~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2loop.cc:3:10: fatal error: 'algorithm' file not found
#include <algorithm>
         ^~~~~~~~~~~
In file included from ~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2pointregion.cc:3:
In file included from ~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2pointregion.h:6:
In file included from ~/realm-demo/.build/checkouts/realm-core/src/external/s2/base/logging.h:17:
In file included from ~/realm-demo/.build/checkouts/realm-core/src/realm/util/assert.hpp:23:
~/realm-demo/.build/checkouts/realm-core/src/realm/util/terminate.hpp:22:10: fatal error: 'cstdlib' file not found
#include <cstdlib>
         ^~~~~~~~~
~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2latlngrect.cc:3:10: fatal error: 'algorithm' file not found
#include <algorithm>
         ^~~~~~~~~~~
In file included from ~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2region.cc:3:
In file included from ~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2region.h:6:
~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2.h:10:10: fatal error: 'algorithm' file not found
#include <algorithm>
         ^~~~~~~~~~~
~/realm-demo/.build/checkouts/realm-core/src/external/s2/s2polygon.cc:3:10: fatal error: 'algorithm' file not found
#include <algorithm>
         ^~~~~~~~~~~

Can you reproduce the bug?

Always

Reproduction Steps

1. Install Swift (Linux installation instructions here, I used the tarball option)
2. Init a Swift project with

mkdir RealmDemo
cd RealmDemo
swift package init --name RealmDemo

3. Add the realm-swift dependency in Package.swift
4. Run swift build to build the project

Version

10.50.0

What Atlas Services are you using?

Local Database only

Are you using encryption?

No

Platform OS and version(s)

Linux Mint 19.3 (Ubuntu 22.04)

Build environment

Swift: 5.10

[sync-by-unito]

➤ PM Bot commented:

Jira ticket: RCOCOA-2362

[xit0c]

This is happening also with Swift on Windows

[nirinchev]

Per my comment on the other issue, only Apple platforms are currently supported. We do have long-term plans to create a pure Swift SDK that can run anywhere, but we're still very far from that future and there's no certainty it will ever arrive.