[Buildroot] Add ability to force a static BB build

[Michael S. Zick]

Ah, but getting it to build. . .

Add: "-static -static-libgcc" to the BusyBox menuconfig "extra cflags":

buildroot$ file output/target/bin/busybox
output/target/bin/busybox: ELF 32-bit LSB executable, MIPS, MIPS32 rel2 version 1 (SYSV), statically linked, with unknown capability 0xf41 = 0x756e6700, stripped

Now to figure out where in the auto-magic build system to fix "build static"
Needed:
CFLAGS+="-static -static-libgcc"
LDFLAGS+="-static"

And clean up that required "-enable-shared -enable-static" library building option.
That is the correct option pair, the other variations are not required.

Mike

On Thu November 19 2009, Michael S. Zick wrote:
> This one I find to be useful for people (like myself)
> that need a static linked busybox before setting up
> a dynamically linked system.
> 
> A1: Yes, this feature could be selected in the busybox config file;
> but exposing the feature in BR allows the use of "canned" BB config
> files without creating a custom one with only "static" changed.
> 
> "Signed-off-by" == "works for me"
> 
> Signed-off-by: Michael S. Zick <minimod at morethan.org>
> 
> diff --git a/package/busybox/Config.in b/package/busybox/Config.in
> index 7438a8d..90cec45 100644
> --- a/package/busybox/Config.in
> +++ b/package/busybox/Config.in
> @@ -56,6 +56,20 @@ config BR2_PACKAGE_BUSYBOX_FULLINSTALL
>  
>  	  If you wish to just install /bin/busybox, then answer N.
>  
> +config BR2_PACKAGE_BUSYBOX_MKSTATIC
> +    bool "Build a staticly linked BusyBox"
> +    depends on BR2_PACKAGE_BUSYBOX
> +    default n
> +    help
> +        This will produce a staticly linked BusyBox.
> +
> +        Over-rides the selection made in the BusyBox config file.
> +
> +        Generates a larger BusyBox that can be run independently
> +        of the rest of the system being built.
> +        Useful if you need to run BusyBox before setting up for
> +        a dynamically linked system.
> +
>  config BR2_PACKAGE_BUSYBOX_CONFIG
>  	string "BusyBox configuration file to use?"
>  	depends on BR2_PACKAGE_BUSYBOX
> diff --git a/package/busybox/busybox.mk b/package/busybox/busybox.mk
> index eb79134..187a06a 100644
> --- a/package/busybox/busybox.mk
> +++ b/package/busybox/busybox.mk
> @@ -77,6 +77,11 @@ ifeq ($(BR2_INET_RPC),y)
>  else
>  	$(SED) "s/^.*CONFIG_FEATURE_MOUNT_NFS.*/CONFIG_FEATURE_MOUNT_NFS=n/;" $(BUSYBOX_DIR)/.config
>  endif
> +ifeq ($(BR2_PACKAGE_BUSYBOX_MKSTATIC),y)
> +	# force static build on
> +	$(SED) "s/^.*CONFIG_STATIC.*/CONFIG_STATIC=y/" $(BUSYBOX_DIR)/.config
> +	$(SED) "s/^.*CONFIG_PIE.*/CONFIG_PIE=n/" $(BUSYBOX_DIR)/.config
> +endif
>  ifeq ($(BR2_PACKAGE_BUSYBOX_SKELETON),y)
>  	# force mdev on
>  	$(SED) "s/^.*CONFIG_MDEV.*/CONFIG_MDEV=y/" $(BUSYBOX_DIR)/.config
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