[Buildroot] [PATCH next v2 1/2] package/apr-util: fix build with per-package folders

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, All,

On 2018-11-20 17:38 +0100, Thomas Petazzoni spake thusly:
> With per-package folder support enable, the build of apr-util fails,
> for two reasons:
> 
>  - The rules.mk file is generated by the 'apr' package, and then
>    copied into the 'apr-util' source directory. This is done by the
>    'apr-util' build process. Unfortunately, this rules.mk file has a
>    number of hardcoded paths: to the compiler and to the libtool
>    script.
> 
>    Due to this, the compiler from the 'apr' per-package folder gets
>    used. But this compiler uses the 'apr' package sysroot, which does
>    not have all the dependencies of the 'apr-util' package, causing
>    the build to fail because <expat.h> is not found.
> 
>  - Similarly, the libtool script itself has some hardcoded paths,
>    which make it use the compiler/linker from the 'apr' per-package
>    folder, so it does not find the expat library.
> 
> We fix both issues by doing the necessary replacement in both rules.mk
> and libtool.
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> ---
> Changes since v1:
>  - Drop the useless logic to copy the libtool script before doing the
>    replacement: as noted by Yann E. Morin, sed is properly breaking
>    hardlinks when doing an in-place replacement.
> ---
>  package/apr-util/apr-util.mk | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/package/apr-util/apr-util.mk b/package/apr-util/apr-util.mk
> index b006964ccb..379dfa692e 100644
> --- a/package/apr-util/apr-util.mk
> +++ b/package/apr-util/apr-util.mk
> @@ -15,6 +15,13 @@ APR_UTIL_CONF_OPTS = \
>  	--with-apr=$(STAGING_DIR)/usr/bin/apr-1-config
>  APR_UTIL_CONFIG_SCRIPTS = apu-1-config
>  
> +define APR_UTIL_FIX_RULES_MK_LIBTOOL
> +	$(SED) 's,$(PER_PACKAGE_DIR)/apr/,$(PER_PACKAGE_DIR)/apr-util/,g' $(@D)/build/rules.mk
> +	$(SED) 's,$(PER_PACKAGE_DIR)/apr/,$(PER_PACKAGE_DIR)/apr-util/,g' \

I know we do not have a strong policy on this, but can you use '@' as
the separator, instead of the comma ',' as we are sure that the build
directory will not contain any '@':
    https://git.buildroot.org/buildroot/commit/Makefile?id=7007dc2bc99ad191c418c468707cdc3980273cda

> +		$(STAGING_DIR)/usr/build-1/libtool

So, you're patching a file in STAGING_DIR in a post-configure hook?

Also, PER_PACKAGE_DIR does yet exist in master (or next, for that
matters), so this patch will have to leave in your branch for a little
while still, I'm afraid.. :-/

> +endef
> +APR_UTIL_POST_CONFIGURE_HOOKS += APR_UTIL_FIX_RULES_MK_LIBTOOL
> +
>  # When iconv is available, then use it to provide charset conversion
>  # features.
>  APR_UTIL_DEPENDENCIES += $(if $(BR2_PACKAGE_LIBICONV),libiconv)
> -- 
> 2.19.1
> 

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