[ 
https://issues.apache.org/jira/browse/MCOMPILER-479?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Halil İbrahim Şener updated MCOMPILER-479:
------------------------------------------
    Description: 
The Javadoc for {{compilerArgs}} states

{quote}
Sets the arguments to be passed to the compiler if {{fork}} is set to {{true}}.
{quote}

However, by looking at the 
[code|https://github.com/apache/maven-compiler-plugin/blob/5463357ebc1c65a4e25bfd8ea4c453a618b66bf1/src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java#L950-L956],
 it seems the arguments are passed unconditionally (whether {{fork}} is enabled 
or not).

Our understanding is that the JVM flags (e.g., {{-J-Duser.language=en_us}}) are 
only applicable when {{fork}} is enabled. However, compiler arguments (e.g. 
{{-Xlint:all}}) are always passed through.

As [~cushon] suggests 
[here|https://github.com/google/error-prone/issues/2786#issuecomment-1004010889],
 maybe we should improve the doc, and/or report a warning/error.

{quote}
Perhaps that could be at least clarified in the docs, or maven could report an 
error if -J is set without fork enabled, or something.
{quote}

See also the discussion in 
[google/error-prone#2786|https://github.com/google/error-prone/issues/2786].

  was:
The Javadoc for {{compilerArgs}} states

{quote}
Sets the arguments to be passed to the compiler if {{fork}} is set to {{true}}.
{quote}

However, by looking at the 
[code|https://github.com/apache/maven-compiler-plugin/blob/5463357ebc1c65a4e25bfd8ea4c453a618b66bf1/src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java#L950-L956],
 it seems the arguments are passed unconditionally (whether {{fork}} is enabled 
or not).

Our understanding is that the JVM flags (e.g., {{-J-Duser.language=en_us}}) are 
only applicable when {{fork}} is enabled. However, compiler arguments (e.g. 
{{-Xlint:all}}) are always passed through.

As [~cushon] suggests 
[here|https://github.com/google/error-prone/issues/2786#issuecomment-1004010889],
 maybe we should improve the doc, and/or report a warning/error.

{quote}
Perhaps that could be at least clarified in the docs, or maven could report an 
error if -J is set without fork enabled, or something.
{quote}

See also the discussion in 
[google/error-prone#2786](https://github.com/google/error-prone/issues/2786).


> Clarify `compilerArgs` Javadoc
> ------------------------------
>
>                 Key: MCOMPILER-479
>                 URL: https://issues.apache.org/jira/browse/MCOMPILER-479
>             Project: Maven Compiler Plugin
>          Issue Type: Improvement
>    Affects Versions: 3.8.1
>            Reporter: Halil İbrahim Şener
>            Priority: Minor
>
> The Javadoc for {{compilerArgs}} states
> {quote}
> Sets the arguments to be passed to the compiler if {{fork}} is set to 
> {{true}}.
> {quote}
> However, by looking at the 
> [code|https://github.com/apache/maven-compiler-plugin/blob/5463357ebc1c65a4e25bfd8ea4c453a618b66bf1/src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java#L950-L956],
>  it seems the arguments are passed unconditionally (whether {{fork}} is 
> enabled or not).
> Our understanding is that the JVM flags (e.g., {{-J-Duser.language=en_us}}) 
> are only applicable when {{fork}} is enabled. However, compiler arguments 
> (e.g. {{-Xlint:all}}) are always passed through.
> As [~cushon] suggests 
> [here|https://github.com/google/error-prone/issues/2786#issuecomment-1004010889],
>  maybe we should improve the doc, and/or report a warning/error.
> {quote}
> Perhaps that could be at least clarified in the docs, or maven could report 
> an error if -J is set without fork enabled, or something.
> {quote}
> See also the discussion in 
> [google/error-prone#2786|https://github.com/google/error-prone/issues/2786].



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