Utility: use Emscripten's _malloc instead of internal allocate

[pezcode]

See mosra/magnum#483 for background discussion.

I compiled with CMAKE_EXE_LINKER_FLAGS_RELEASE=-s ASSERTIONS=2 but couldn't get the old code to fire an assertion, I might have set the wrong CMake flag?

Utility::ArgumentsTest output:

OK [01] environment()
OK [02] environmentUtf8()
OK [03] copy()
OK [04] move()
OK [05] helpArgumentsOnly()
OK [06] helpNamedOnly()
OK [07] helpBoth()
OK [08] helpText()
OK [09] helpEmpty()
OK [10] helpEnvironment()
OK [11] helpEnvironmentPrefixed()
OK [12] helpAfterParse()
OK [13] helpLongKeys()
OK [14] helpLongKeyNotPrinted()
OK [15] helpFinalOptionalArgument()
OK [16] helpFinalOptionalArgumentDefaultValueOnly()
OK [17] setHelpNotFound()
OK [18] setHelpKeyForBoolean()
OK [19] duplicateKey()
OK [20] duplicateShortKey()
OK [21] emptyKey()
OK [22] disallowedCharacter()
OK [23] disallowedCharacterShort()
OK [24] disallowedIgnoreUnknown()
OK [25] arrayArgumentTwice()
OK [26] finalOptionalArgumentTwice()
OK [27] finalOptionalArgumentWithArray()
OK [28] argumentAfterFinalOptionalArgument()
OK [29] arrayArgumentAfterFinalOptionalArgument()
OK [30] parseNullptr()
Superfluous command-line argument error
OK [31] parseHelp()
OK [32] parseArguments()
OK [33] parseMixed()
OK [34] parseStringView()
OK [35] parseCustomType()
OK [36] parseCustomTypeFlags()
OK [37] parseCustomTypeUsingContainersString()
OK [38] parseEnvironment()
OK [39] parseEnvironmentUtf8()
OK [40] parseFinalOptionalArgument()
OK [41] parseFinalOptionalArgumentDefault()
OK [42] parseShortOptionValuePack()
OK [43] parseShortOptionValuePackEmpty()
OK [44] parseShortBooleanOptionPack()
OK [45] parseShortBooleanOptionValuePack()
OK [46] parseArrayArguments()
OK [47] parseArrayOptions()
OK [48] parseUnknownArgument()
OK [49] parseUnknownShortArgument()
OK [50] parseSuperfluousArgument()
OK [51] parseSingleDash()
OK [52] parseArgumentAfterSeparator()
OK [53] parseInvalidShortArgument()
OK [54] parseInvalidLongArgument()
OK [55] parseInvalidLongArgumentDashes()
OK [56] parseMissingValue()
OK [57] parseMissingOption()
OK [58] parseMissingArgument()
OK [59] parseMissingArrayArgumentMiddle()
OK [60] parseMissingArrayArgumentLast()
OK [61] prefixedParse()
OK [62] prefixedParseMinus()
OK [63] prefixedParseMinusMinus()
OK [64] prefixedParseHelpArgument()
OK [65] prefixedHelpWithoutPrefix()
OK [66] prefixedHelpWithPrefix()
OK [67] prefixedHelpLongPrefix()
OK [68] prefixedDisallowedCalls()
OK [69] prefixedDisallowedWithPrefix()
OK [70] prefixedDisallowedWithPrefixAfterSkipPrefix()
OK [71] prefixedUnknownWithPrefix()
OK [72] prefixedInvalidPrefixedName()
OK [73] prefixedInvalidUnprefixedName()
OK [74] prefixedIgnoreUnknown()
OK [75] prefixedIgnoreUnknownInvalidPrefixedName()
OK [76] notParsedYet()
OK [77] notParsedYetOnlyHelp()
OK [78] valueNotFound()
OK [79] valueMismatchedUse()
OK [80] arrayValueOutOfBounds()
OK [81] parseErrorCallback()
OK [82] parseErrorCallbackIgnoreAll()
OK [83] parseErrorCallbackIgnoreAll2()
OK [84] debugParseError()
Finished Corrade::Utility::Test::ArgumentsTest with 0 errors out of 240 checks.

[mosra]

Thank you! I'll wait for @Squareys to confirm both this and mosra/magnum#483 works for him.

I compiled with CMAKE_EXE_LINKER_FLAGS_RELEASE=-s ASSERTIONS=2 but couldn't get the old code to fire an assertion, I might have set the wrong CMake flag?

I have no idea 😅 @Squareys are you able to confirm that the old code fired an assertion?

[codecov]

Codecov Report

Merging #106 (f6b77fc) into master (92daf1a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #106   +/-   ##
=======================================
  Coverage   97.56%   97.56%           
=======================================
  Files          98       98           
  Lines        7193     7193           
=======================================
  Hits         7018     7018           
  Misses        175      175           

Impacted Files	Coverage Δ
src/Corrade/Utility/Arguments.cpp	100.00% <ø> (ø)

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[Squareys]

@mosra @pezcode Looks good!

[mosra]

@pezcode thank you!

Took me a while to merge because Travis switched me to a trial plan and I have about one more build until I run out of the 10000 credits that I was given for the lifetime, so I need to use those scarce resources carefully 😬