RFR: 8314488: Compile the JDK as C++17 [v6]

[Magnus Ihse Bursie]

On Fri, 19 Jan 2024 12:08:21 GMT, Julian Waters <jwaters at openjdk.org> wrote:

>> Julian Waters has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Require clang 13 in toolchain.m4
>
> Should I split the compiler upgrades into a different change and integrate that first? Going off the conversation in this thread it would seem like the compiler upgrade would benefit us a lot more than just having C++17 (The noreturn attribute is one big motivating factor for instance) and it might help if the compiler upgrades were not delayed by the discussion of when to jump to C++17

Also, @TheShermanTanker, can you please incorporate this patch that updates the build documentation to match the changes in configure?


diff --git a/doc/building.html b/doc/building.html
index 7fd530e9dbc..bb5fda24ba7 100644
--- a/doc/building.html
+++ b/doc/building.html
@@ -599,14 +599,14 @@ <h2 id="native-compiler-toolchain-requirements">Native Compiler
 <p>All compilers are expected to be able to handle the C11 language
 standard for C, and C++14 for C++.</p>
 <h3 id="gcc">gcc</h3>
-<p>The minimum accepted version of gcc is 6.0. Older versions will not
+<p>The minimum accepted version of gcc is 10.0. Older versions will not
 be accepted by <code>configure</code>.</p>
 <p>The JDK is currently known to compile successfully with gcc version
 13.2 or newer.</p>
 <p>In general, any version between these two should be usable.</p>
 <h3 id="clang">clang</h3>
-<p>The minimum accepted version of clang is 3.5. Older versions will not
-be accepted by <code>configure</code>.</p>
+<p>The minimum accepted version of clang is 13.0. Older versions will
+not be accepted by <code>configure</code>.</p>
 <p>To use clang instead of gcc on Linux, use
 <code>--with-toolchain-type=clang</code>.</p>
 <h3 id="apple-xcode">Apple Xcode</h3>
@@ -672,7 +672,9 @@ <h3 id="microsoft-visual-studio">Microsoft Visual Studio</h3>
 <code>BuildTools</code>, but e.g. <code>Professional</code>, adjust the
 product ID accordingly.</p>
 <h3 id="ibm-xl-cc">IBM XL C/C++</h3>
-<p>Please consult the AIX section of the <a
+<p>The minimum accepted version of xlc is 17.1.1.4. Older versions will
+not be accepted by <code>configure</code>.</p>
+<p>For further information, please consult the AIX section of the <a
 href="https://wiki.openjdk.org/display/Build/Supported+Build+Platforms">Supported
 Build Platforms</a> OpenJDK Build Wiki page for details about which
 versions of XLC are supported.</p>
diff --git a/doc/building.md b/doc/building.md
index de410439446..9113e0243bd 100644
--- a/doc/building.md
+++ b/doc/building.md
@@ -403,7 +403,7 @@ ## Native Compiler (Toolchain) Requirements
 
 ### gcc
 
-The minimum accepted version of gcc is 6.0. Older versions will not be accepted
+The minimum accepted version of gcc is 10.0. Older versions will not be accepted
 by `configure`.
 
 The JDK is currently known to compile successfully with gcc version 13.2 or
@@ -413,7 +413,7 @@ ### gcc
 
 ### clang
 
-The minimum accepted version of clang is 3.5. Older versions will not be
+The minimum accepted version of clang is 13.0. Older versions will not be
 accepted by `configure`.
 
 To use clang instead of gcc on Linux, use `--with-toolchain-type=clang`.
@@ -489,9 +489,12 @@ ### Microsoft Visual Studio
 
 ### IBM XL C/C++
 
-Please consult the AIX section of the [Supported Build Platforms](
-https://wiki.openjdk.org/display/Build/Supported+Build+Platforms) OpenJDK Build
-Wiki page for details about which versions of XLC are supported.
+The minimum accepted version of xlc is 17.1.1.4. Older versions will not be
+accepted by `configure`.
+
+For further information, please consult the AIX section of the [Supported Build
+Platforms](https://wiki.openjdk.org/display/Build/Supported+Build+Platforms)
+OpenJDK Build Wiki page for details about which versions of XLC are supported.
 
 ## Boot JDK Requirements

-------------

PR Comment: https://git.openjdk.org/jdk/pull/14988#issuecomment-1923565064