How to disable warnings treated as errors during the JDK build?

[S A]

Alright, thank you Thomas, thank you Erik!

Using JDK 19 as boot JDK does make the JDK 20 build work; I didn't know the
recommendation was to use the previous JDK as a boot JDK.

On Fri, 15 Mar 2024 at 17:55, <erik.joelsson at oracle.com> wrote:

> The configure flag --disable-warnings-as-errors only applies to native
> compilation, where the C/C++ compiler is used. For Java compilation,
> most of the source code is built using the interim javac, which is
> itself built from the JDK src, so we have full control over what
> warnings should or shouldn't be enabled. The rest of the Java source
> code is compiled using the javac in the bootjdk, which is also well
> defined.
>
> Your build is failing when compiling the interim javac using the
> bootjdk. That could only happen if you use a bootjdk that isn't
> appropriate for the version of the JDK src. We generally allow bootjdk
> of version N-1 or N for building JDK N. However, using a newer build of
> JDK N than the source in question does run the risk of having new
> warnings that haven't been fixed in the older source. So using bootjdk
> version N isn't recommended unless you know what you are doing.
>
> The recommendation is to always use JDK N-1 for bootjdk. That's the
> officially supported version.
>
> /Erik
>
> On 3/15/24 08:27, S A wrote:
> > Hi all,
> >
> > how do I disable warnings treated as errors during the OpenJDK 19+ build?
> >
> > In order to better understand changes in behavior between OpenJDK
> > versions, I've been bisecting and compiling OpenJDK 19 and OpenJDK 20
> > in the recent months.
> >
> > One problem that I run into a lot is warnings failing the build. How
> > do I disable this behavior? Due to different work environments, I
> > compile with a few versions of gcc, so the warnings differ based on
> > the gcc version. So far I've been changing the gcc version in order to
> > be able to compile, but this is tiresome.
> >
> > According to the guide, the behavior can be configured away:
> >
> > https://openjdk.org/groups/build/doc/building.html
> >
> > > By default, the JDK has a strict approach where warnings from the
> > compiler is considered errors which fail the build. For very new or
> > very old compiler versions, this can trigger new classes of warnings,
> > which thus fails the build. Run configure with
> > --disable-warnings-as-errors to turn of this behavior. (The warnings
> > will still show, but not make the build fail.)
> >
> > Unfortunately, e.g. with OpenJDK 20, the build still fails due to
> > warnings. Has the configuration option changed?
> >
> > E.g. using gcc:
> >
> > gcc version 10.2.1
> >
> > Building at commit:
> >
> > commit 388a56e4c4278f2a3da31946b15a45f3aee25e58 (HEAD, tag: jdk-20+20)
> >
> > I run into warnings that cause the build to fail:
> >
> > ERROR: Build failed for target 'images' in configuration
> > 'linux-x86_64-server-release' (exit code 2)
> >
> > === Output from failing command(s) repeated here ===
> > * For target
> >
> buildtools_interim_langtools_modules_jdk.compiler.interim__the.BUILD_jdk.compiler.interim_batch:
> >
> /data/git/jdk/src/jdk.compiler/share/classes/com/sun/tools/javac/file/FSInfo.java:140:
>
> > warning: [deprecation] URL(URL,String) in URL has been deprecated
> >         URL retVal = new URL(base, input);
> >                      ^
> > error: warnings found and -Werror specified
> >
> /data/git/jdk/src/jdk.compiler/share/classes/com/sun/tools/javac/launcher/Main.java:693:
>
> > warning: [deprecation] URL(String,String,int,String,URLStreamHandler)
> > in URL has been deprecated
> >                 return new URL(PROTOCOL, null, -1, name, handler);
> >                        ^
> >
> /data/git/jdk/src/jdk.compiler/share/classes/com/sun/tools/javac/processing/ServiceProxy.java:141:
>
> > warning: [deprecation] URL(URL,String) in URL has been deprecated
> >                 URL u = new URL(url, fullName);
> >                         ^
> > 1 error
> > 3 warnings
> >
> > Despite configuration:
> >
> > using configure arguments '--disable-warnings-as-errors
> > --with-boot-jdk=/data/jdk/openjdk-20.0.2_linux-x64_bin/jdk-20.0.2/
> > --with-toolchain-type=gcc'
> >
> > Best regards and thanks,
> > Simeon
>
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