[Buildroot] [PATCH 4/4] package/openjdk: add support for building the full jdk

[Yann E. MORIN]

Adam, All,

On 2020-04-17 16:29 -0700, aduskett at gmail.com spake thusly:
> From: Adam Duskett <Aduskett at gmail.com>
> 
> Some users may require the full JDK on the target to debug or compile programs.
> This change is relatively trivial to add.

I concur with Thomas on that one: we do not want to support doing
development on the target.

I've marked the patch as rejected in patchwork, now.

Still, please read on for further review of this comit log...

> To install the full JDK, do the following:
>   - Add a new entry in package/openjdk/Config.in with the variable
>     BR2_PACKAGE_OPENJDK_FULL_JDK
> 
>   - Check for this variable in openjdk.mk, if it is selected set the following
>     variables:
>       OPENJDK_INSTALL_DIR = jdk
>       OPENJDK_MAKE_TARGET=jdk-image
>     Otherwise, set the variables to jre and legacy-jre-image respectively.
> 
>   - change legacy-jre-image to $(OPENJDK_MAKE_TARGET) in the OPENJD_BUILD_CMDS
>     define.
> 
>   - Change jre/* to $(OPENJDK_INSTALL_DIR)/* in the OPENJDK_INSTALL_TARGET_CMDS
>     define

Again, this commit log is not very helpful: it explains what is done,
which is not so much interesting in itself: it is just restating what
the code does, so it is bnetter to look at the code. What a commit log
should do, is explain *why* a change needs to be done.

Basically, a commit log should be a three-stage story:

 1. description of the problem
 2. explanations of why the problem occurs
 3. explanations on how we solve the problem

Regards,
Yann E. MORIN.

> Signed-off-by: Adam Duskett <Aduskett at gmail.com>
> ---
>  package/openjdk/Config.in  |  7 +++++++
>  package/openjdk/openjdk.mk | 12 ++++++++++--
>  2 files changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/package/openjdk/Config.in b/package/openjdk/Config.in
> index 61294ec49f..158f3031c3 100644
> --- a/package/openjdk/Config.in
> +++ b/package/openjdk/Config.in
> @@ -49,6 +49,13 @@ config BR2_PACKAGE_OPENJDK
>  
>  if BR2_PACKAGE_OPENJDK
>  
> +config BR2_PACKAGE_OPENJDK_FULL_JDK
> +	bool "Build the full JDK"
> +	help
> +	  Install the full JDK instead of just the run time.
> +	  Selecting this option will increase the file system by
> +	  approximately 110M.
> +
>  choice
>  	prompt "openjdk variant"
>  	default BR2_PACKAGE_OPENJDK_JVM_VARIANT_SERVER if !BR2_powerpc
> diff --git a/package/openjdk/openjdk.mk b/package/openjdk/openjdk.mk
> index 19e71e98b2..e8803f3cb5 100644
> --- a/package/openjdk/openjdk.mk
> +++ b/package/openjdk/openjdk.mk
> @@ -46,6 +46,14 @@ OPENJDK_JVM_VARIANT = zero
>  OPENJDK_DEPENDENCIES += libffi
>  endif
>  
> +ifeq ($(BR2_PACKAGE_OPENJDK_FULL_JDK),y)
> +OPENJDK_INSTALL_DIR = jdk
> +OPENJDK_MAKE_TARGET=jdk-image
> +else
> +OPENJDK_INSTALL_DIR = jre
> +OPENJDK_MAKE_TARGET=legacy-jre-image
> +endif
> +
>  # Because jre/lib has a modules file, installation on a system with a merged
>  # /usr directory, and a built Kernel before OpenJDK, the following error
>  # occurs: "cp: cannot overwrite directory '/usr/lib/modules with non-directory"
> @@ -117,14 +125,14 @@ endef
>  # Make -jn is unsupported. Instead, set the "--with-jobs=" configure option,
>  # and use $(MAKE1).
>  define OPENJDK_BUILD_CMDS
> -	$(TARGET_MAKE_ENV) $(MAKE1) -C $(@D) legacy-jre-image
> +	$(TARGET_MAKE_ENV) $(OPENJDK_CONF_ENV) $(MAKE1) -C $(@D) $(OPENJDK_MAKE_TARGET)
>  endef
>  
>  # Calling make install always builds and installs the JDK instead of the JRE,
>  # which makes manual installation necessary.
>  define OPENJDK_INSTALL_TARGET_CMDS
>  	mkdir -p $(TARGET_DIR)/$(OPENJDK_INSTALL_BASE)
> -	cp -dpfr $(@D)/build/linux-*-release/images/jre/* \
> +	cp -dpfr $(@D)/build/linux-*-release/images/$(OPENJDK_INSTALL_DIR)/* \
>  		$(TARGET_DIR)/$(OPENJDK_INSTALL_BASE)
>  	cd $(TARGET_DIR)/usr/bin && ln -snf ../../$(OPENJDK_INSTALL_BASE)/bin/* .
>  endef
> -- 
> 2.25.2
> 
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