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Upgrade: workaround for compiler-bug

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Compilation failure with GCC-14.2 with the following code

class Base
  {
  protected:
    Base() = default;
  };

struct Feed
  : Base
  { };

int
main (int, char**)
  {
    Feed f1;
//  Feed f2{};       /// does not compile with GCC 14.2
    return 0;
  }

In the actual code base this can be triggered when instantiating
classes with the `NonCopyable`-mix-in; seemingly the compiler attempts
to invoke the base class ctor directly, while it should invoke a
(synthesised) default ctor for the derived class.

The problem could not be reproduced with other compiler versions at Godbolt.org
This commit is contained in:
Fischlurch 2025-06-20 16:09:22 +02:00
parent afa7ca2e4d
commit de066348af
2 changed files with 109 additions and 7 deletions
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4
src/steam/engine/param-weaving-pattern.hpp
View file

@ -307,8 +307,6 @@ namespace engine {
{
builder.emplaceParamDataBlock (&block(), turnoutSys);
}
///////////////OOO
Feed()= default;
};
@ -324,7 +322,7 @@ namespace engine {
Feed
mount (TurnoutSystem&)
{
return Feed{};
return Feed();
}
/** Invoke the parameter-functors to create the basic parameter data */

112
wiki/thinkPad.ichthyo.mm
View file

@ -166109,18 +166109,122 @@ Since then others have made contributions, see the log for the history.</font></
</node>
</node>
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<icon BUILTIN="flag-yellow"/>
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<node CREATED="1750182983241" ID="ID_162769760" MODIFIED="1750182992885" TEXT="aufgetreten bei: ParamWeavingPattern::Feed"/>
<node CREATED="1750200330494" ID="ID_605009478" MODIFIED="1750200385831" TEXT="ohne user-provided default-ctor: rejected as non-accessible">
<icon BUILTIN="broken-line"/>
<node BACKGROUND_COLOR="#f8f1cb" COLOR="#a50125" CREATED="1750201601058" ID="ID_230327461" MODIFIED="1750201616690" TEXT="lt. Doku nicht nachvollziehbar">
<node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1750201601058" ID="ID_230327461" MODIFIED="1750433762723" TEXT="lt. Doku nicht nachvollziehbar">
<icon BUILTIN="messagebox_warning"/>
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<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1750201617519" ID="ID_184461569" MODIFIED="1750201626715" TEXT="Untersuchung">
<node BACKGROUND_COLOR="#c8c0b6" COLOR="#ff0000" CREATED="1750201617519" ID="ID_184461569" MODIFIED="1750433758903" TEXT="Untersuchung">
<icon BUILTIN="yes"/>
<node CREATED="1750431808678" ID="ID_1965718984" MODIFIED="1750433611399" TEXT="reproduzierbar auf Minimum reduziert">
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<head>
</head>
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<div style="background-color: #eee0b5; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 2px">
<div style="color: #202020; background-color: #eee0b5; font-family: Bitstream Vera Sans Mono; font-size: 9pt; white-space: pre">
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#4a1a65"><b>class</b></font><font color="#3a1f18">&#160;</font><font color="#635e96"><b>Base</b></font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#11123a">{</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#4a1a65"><b>protected</b></font><font color="#65533c">:</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#632d2d"><b>Base</b></font><font color="#11123a">()</font><font color="#3a1f18">&#160;</font><font color="#65533c">=</font><font color="#3a1f18">&#160;</font><font color="#4a1a65"><b>default</b></font><font color="#65533c">;</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#11123a">}</font><font color="#65533c">;</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<br />
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#4a1a65"><b>struct</b></font><font color="#3a1f18">&#160;</font><font color="#635e96"><b>Feed</b></font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#65533c">:</font><font color="#3a1f18">&#160;</font><font color="#635e96"><b>Base</b></font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#11123a">{</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#11123a">}</font><font color="#65533c">;</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<br />
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#7f004c"><b>int</b></font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#000000"><b>main</b></font><font color="#3a1f18">&#160;</font><font color="#11123a">(</font><font color="#7f004c"><b>int</b></font><font color="#65533c">,</font><font color="#3a1f18">&#160;</font><font color="#7f004c"><b>char</b></font><font color="#65533c">**</font><font color="#11123a">)</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#11123a">{</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#635e96"><b><u>Feed</u></b></font><u><font color="#3a1f18">&#160;</font><font color="#814422">f1</font><font color="#65533c">;</font></u>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#977b75">// Feed f1{}; /// does not compile with GCC 14.2</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#4a1a65"><b>return</b></font><font color="#3a1f18">&#160;</font><font color="#29466b">0</font><font color="#65533c">;</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
<font color="#11123a">}</font>
</p>
<p style="margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0">
</p>
</div>
</div>
</body>
</html>
</richcontent>
<node CREATED="1750431987479" ID="ID_1874210875" MODIFIED="1750431993919" TEXT="der reine Konstruktor-Aufruf"/>
<node CREATED="1750431994699" ID="ID_36138667" MODIFIED="1750432009276" TEXT="Basisklasse mu&#xdf; public inherited sein"/>
<node CREATED="1750431861506" ID="ID_349299837" MODIFIED="1750433803907" TEXT="wird nur getriggert mit initialiser-List-Syntax">
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</node>
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<node CREATED="1750433613200" ID="ID_715564880" MODIFIED="1750433623941" TEXT="nicht reproduzierbar auf Godbolt.org">
<node CREATED="1750433625092" ID="ID_372282359" MODIFIED="1750433632707" TEXT="weder mit irgend einem der neueren GCC"/>
<node CREATED="1750433633463" ID="ID_184140701" MODIFIED="1750433641934" TEXT="noch mit CLang"/>
</node>
</node>
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<head>
</head>
<body>
<p>
vermutlich ein <i>sehr spezieller</i>&#160;Compiler-Bug
</p>
</body>
</html>
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<icon BUILTIN="clanbomber"/>
</node>
<node COLOR="#338800" CREATED="1750433708917" ID="ID_1697745986" MODIFIED="1750436517188" TEXT="einfacher Workaround: keine initialiser-List-Syntax verwenden">
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<node COLOR="#338800" CREATED="1750183336531" ID="ID_75715335" MODIFIED="1750201590066" TEXT="string{nullptr} scheitert nun im Compile">
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