Fixes in 1986/marshall/compilers.{md,html}
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@@ -25,7 +25,8 @@ if nothing else.
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## Alternate code:
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Due to the different [conflicting problems](compilers.html) with gcc and clang, we
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Due to the different [conflicting problems](compilers.html) with `gcc` and
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`clang`, we
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instead offer the problematic code as an alternate version whereas
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[marshall.c](%%REPO_URL%%/1986/marshall/marshall.c) has both the infinite loop and the complicated arg to
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`_exit()` commented out, changing the value passed into `_exit()` to `1`.
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@@ -378,7 +378,7 @@
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<!-- BEFORE: 1st line of markdown file: 1986/marshall/compilers.md -->
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<h1 id="conflicting-compilers-and-optimisers-that-broke-this-entry-in-2023">Conflicting compilers and optimisers that broke this entry in 2023</h1>
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<p>As briefly noted in the <a href="index.html">index.html</a> gcc and clang caused different
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<p>As briefly noted in the <a href="index.html">index.html</a> <code>gcc</code> and <code>clang</code> caused different
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problems with this entry depending on the optimiser being enabled or not, where
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if the optimiser was enabled it would work with one compiler and not the other.
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But if you then disabled the optimiser the opposite problem would occur: the
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@@ -386,7 +386,7 @@ working compiler would no longer work and the non-functional one would start to
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work! And then there’s the problem of linux versus macOS causing problems.</p>
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<p>The <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1986/marshall/marshall.alt.c">alternate code</a> (source code) demonstrates the problem so
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you can see if your compiler has the problem as described below.</p>
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<p>In some versions of gcc and clang (this was first discovered in fedora linux 38)
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<p>In some versions of <code>gcc</code> and <code>clang</code> (this was first discovered in fedora linux 38)
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if the compiler was enabled one compiler would generate code that segfaulted but
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the other one would not. However, when then disabling the optimiser the compiler
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that had no problem suddenly did and the one that did suddenly did not. But
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@@ -396,25 +396,26 @@ entered. But then removing it would cause other problems as well, including a
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segfault.</p>
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<p>It was not only one compiler that dumped core. Both dumped core with other
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behaviour, depending on what changes in code were made and the optimiser being
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on or off. Clang in macOS also dumped core!</p>
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<p>The <a href="index.html">index.html</a> has the original fix
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for clang which works with some compilers depending on the optimiser. When we
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refer to the code below we refer to the alternate code.</p>
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on or off. <code>Clang</code> in macOS also dumped core!</p>
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<p>The <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1986/marshall/marshall.c">marshall.c</a> has the original fix
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for <code>clang</code> which works with some compilers depending on the optimiser. When we
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refer to the code below we refer to the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1986/marshall/marshall.alt.c">alternate code,
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marshall.alt.c</a>.</p>
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<h2 id="the-conflicting-compiler-problems">The conflicting compiler problems:</h2>
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<p>Below we describe the conflicting options that resulted in the need to modify
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the original code.</p>
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<h3 id="linux">Linux</h3>
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<p>With the optimiser disabled GCC compiled the code to enter an infinite loop.
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Enabling the optimiser and it worked fine. But if the optimiser is enabled clang
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generates code that first prints the text twice (it should print it once) and
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<p>With the optimiser disabled <code>GCC</code> compiled the code to enter an infinite loop.
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If the optimiser was enabled it worked fine. But if the optimiser is enabled
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<code>clang</code> generates code that first prints the text twice (it should print it once) and
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then immediately dumps core!</p>
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<p>But then there’s that infinite loop. What happens if we remove it?</p>
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<p>Once the loop is removed if we compile with clang and the optimiser is disabled
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all is okay. If however we compile with gcc and the optimiser is disabled the
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<p>Once the loop is removed if we compile with <code>clang</code> and the optimiser is disabled
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all is okay. If however we compile with <code>gcc</code> and the optimiser is disabled the
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string is printed once and then the program dumps core! Why is this? It is
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because of the call to <code>_exit()</code> (see below).</p>
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<p>Clang works fine with the loop removed and the optimiser disabled. If however we
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enable the optimiser clang will generate code that prints the string twice and
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<p><code>Clang</code> works fine with the loop removed and the optimiser disabled. If however we
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enable the optimiser <code>clang</code> will generate code that prints the string twice and
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dumps core just like before! What about the call to <code>_exit()</code>?</p>
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<p>The call was:</p>
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<pre><code> _exit(argv[(int)*argc-2/cc[1*(int)*argc]|-1<<4]);</code></pre>
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@@ -438,7 +439,7 @@ change to <code>_exit()</code>.</p>
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<p>And that is the tale of a little <del>engine</del> train that
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could…eventually! Or perhaps it’s the compilers, optimisers and OSes that
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eventually could?</p>
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<p>Whichever you wish it to be, it now works with both clang and gcc! Choo choo!</p>
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<p>Whichever you wish it to be, it now works with both <code>clang</code> and <code>cc</code> Choo choo!</p>
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<hr style="width:10%;text-align:left;margin-left:0">
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<p>Jump to: <a href="#">top</a></p>
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<!--
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+15
-14
@@ -1,6 +1,6 @@
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# Conflicting compilers and optimisers that broke this entry in 2023
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As briefly noted in the [index.html](index.html) gcc and clang caused different
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As briefly noted in the [index.html](index.html) `gcc` and `clang` caused different
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problems with this entry depending on the optimiser being enabled or not, where
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if the optimiser was enabled it would work with one compiler and not the other.
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But if you then disabled the optimiser the opposite problem would occur: the
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@@ -10,7 +10,7 @@ work! And then there's the problem of linux versus macOS causing problems.
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The [alternate code](%%REPO_URL%%/1986/marshall/marshall.alt.c) (source code) demonstrates the problem so
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you can see if your compiler has the problem as described below.
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In some versions of gcc and clang (this was first discovered in fedora linux 38)
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In some versions of `gcc` and `clang` (this was first discovered in fedora linux 38)
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if the compiler was enabled one compiler would generate code that segfaulted but
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the other one would not. However, when then disabling the optimiser the compiler
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that had no problem suddenly did and the one that did suddenly did not. But
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@@ -22,11 +22,12 @@ segfault.
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It was not only one compiler that dumped core. Both dumped core with other
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behaviour, depending on what changes in code were made and the optimiser being
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on or off. Clang in macOS also dumped core!
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on or off. `Clang` in macOS also dumped core!
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The [index.html](index.html) has the original fix
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for clang which works with some compilers depending on the optimiser. When we
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refer to the code below we refer to the alternate code.
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The [marshall.c](%%REPO_URL%%/1986/marshall/marshall.c) has the original fix
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for `clang` which works with some compilers depending on the optimiser. When we
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refer to the code below we refer to the [alternate code,
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marshall.alt.c](%%REPO_URL%%/1986/marshall/marshall.alt.c).
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## The conflicting compiler problems:
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@@ -35,20 +36,20 @@ the original code.
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### Linux
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With the optimiser disabled GCC compiled the code to enter an infinite loop.
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Enabling the optimiser and it worked fine. But if the optimiser is enabled clang
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generates code that first prints the text twice (it should print it once) and
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With the optimiser disabled `GCC` compiled the code to enter an infinite loop.
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If the optimiser was enabled it worked fine. But if the optimiser is enabled
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`clang` generates code that first prints the text twice (it should print it once) and
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then immediately dumps core!
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But then there's that infinite loop. What happens if we remove it?
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Once the loop is removed if we compile with clang and the optimiser is disabled
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all is okay. If however we compile with gcc and the optimiser is disabled the
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Once the loop is removed if we compile with `clang` and the optimiser is disabled
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all is okay. If however we compile with `gcc` and the optimiser is disabled the
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string is printed once and then the program dumps core! Why is this? It is
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because of the call to `_exit()` (see below).
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Clang works fine with the loop removed and the optimiser disabled. If however we
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enable the optimiser clang will generate code that prints the string twice and
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`Clang` works fine with the loop removed and the optimiser disabled. If however we
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enable the optimiser `clang` will generate code that prints the string twice and
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dumps core just like before! What about the call to `_exit()`?
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The call was:
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@@ -90,7 +91,7 @@ And that is the tale of a little <del>engine</del> train that
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could...eventually! Or perhaps it's the compilers, optimisers and OSes that
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eventually could?
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Whichever you wish it to be, it now works with both clang and gcc! Choo choo!
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Whichever you wish it to be, it now works with both `clang` and `cc` Choo choo!
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<hr style="width:10%;text-align:left;margin-left:0">
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@@ -409,7 +409,8 @@ if nothing else.</p>
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<h2 id="to-use">To use:</h2>
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<pre><code> ./marshall</code></pre>
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<h2 id="alternate-code">Alternate code:</h2>
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<p>Due to the different <a href="compilers.html">conflicting problems</a> with gcc and clang, we
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<p>Due to the different <a href="compilers.html">conflicting problems</a> with <code>gcc</code> and
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<code>clang</code>, we
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instead offer the problematic code as an alternate version whereas
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<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1986/marshall/marshall.c">marshall.c</a> has both the infinite loop and the complicated arg to
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<code>_exit()</code> commented out, changing the value passed into <code>_exit()</code> to <code>1</code>.</p>
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