[SR-9987] Test - ClangImporter/cfuncs_parse.swift failing on AArch64

[futurejones]

Previous ID	SR-9987
Radar	None
Original Reporter	@futurejones
Type	Bug

Environment

Linux Ubuntu 16.04 LTS on AArch64

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Bug, Linux, Test, aarch64
Assignee	None
Priority	Medium

md5: eb3d7890020a1648c573c33a18ba09a3

Issue Description:

Swift(linux-aarch64) :: ClangImporter/cfuncs_parse.swift is failing

******************** TEST 'Swift(linux-aarch64) :: ClangImporter/cfuncs_parse.swift' FAILED ********************
Script:
--
: 'RUN: at line 1';   /home/worksonarm_test/jenkins_slave/workspace/swift-5.0-aarch64/build/buildbot_linux/swift-linux-aarch64/bin/swift -frontend -target aarch64-unknown-linux-gnu  -module-cache-path '/home/worksonarm_test/jenkins_slave/workspace/swift-5.0-aarch64/build/buildbot_linux/swift-linux-aarch64/swift-test-results/aarch64-unknown-linux-gnu/clang-module-cache' -swift-version 4   -enable-source-import -sdk '/home/worksonarm_test/jenkins_slave/workspace/swift-5.0-aarch64/swift/test/Inputs/clang-importer-sdk' -I '/home/worksonarm_test/jenkins_slave/workspace/swift-5.0-aarch64/swift/test/Inputs/clang-importer-sdk/swift-modules'   -typecheck -verify -I /home/worksonarm_test/jenkins_slave/workspace/swift-5.0-aarch64/swift/test/ClangImporter/Inputs /home/worksonarm_test/jenkins_slave/workspace/swift-5.0-aarch64/swift/test/ClangImporter/cfuncs_parse.swift
--
Exit Code: 1

Command Output (stderr):
--
/home/worksonarm_test/jenkins_slave/workspace/swift-5.0-aarch64/swift/test/ClangImporter/cfuncs_parse.swift:61:3: error: unexpected error produced: use of unresolved identifier 'powl'
  powl(1.5, 2.5)
  ^

--

********************

[futurejones]

The reasons for this failure are outlined in PR #19846

[futurejones]

On Linux there is no C 'long double' type unless arch==(x86_64) || arch(i386)

Therefore the "powl" test should be disabled for Linux "other archtypes" until support is added.

Or maybe it should default to "Double"?

/// The C 'long double' type.
#if os(OSX) || os(iOS) || os(watchOS) || os(tvOS)
// On Darwin, long double is Float80 on x86, and Double otherwise.
#if arch(x86_64) || arch(i386)
public typealias CLongDouble = Float80
#else
public typealias CLongDouble = Double
#endif
#elseif os(Windows)
// On Windows, long double is always Double.
public typealias CLongDouble = Double
#elseif os(Linux)
// On Linux/x86, long double is Float80.
// TODO: Fill in definitions for additional architectures as needed. IIRC
// armv7 should map to Double, but arm64 and ppc64le should map to Float128,
// which we don't yet have in Swift.
#if arch(x86_64) || arch(i386)
public typealias CLongDouble = Float80
#endif
// TODO: Fill in definitions for other OSes.
#endif

[belkadan]

cc @stephentyrone