pkg-autotools: add a AUTOCONF_AC_CHECK_FILE_VAL macro
When configure.ac scripts do AC_CHECK_FILE tests, they always fail in cross-compilation contexts because it is not possible to check for file existence during the build process. Therefore we have to preseed the configure environment with ac_cv_file_<foo>=yes variable, <foo> being the path of the file, where all slashes, dots or dashes have been replaced by underscores. In the context of the boot-wrapper-aarch64, we will have to use three of these variables, with fairly complex paths. So instead of replicating the logic each time, we create a AUTOCONF_AC_CHECK_FILE_VAL macro to help defining such variables. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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@ -36,6 +36,16 @@ define CONFIG_UPDATE
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done
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endef
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# This function generates the ac_cv_file_<foo> value for a given
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# filename. This is needed to convince configure script doing
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# AC_CHECK_FILE() tests that the file actually exists, since such
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# tests cannot be done in a cross-compilation context. This function
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# takes as argument the path of the file. An example usage is:
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#
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# FOOBAR_CONF_ENV = \
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# $(call AUTOCONF_AC_CHECK_FILE_VAL,/dev/random)=yes
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AUTOCONF_AC_CHECK_FILE_VAL = ac_cv_file_$(subst -,_,$(subst /,_,$(subst .,_,$(1))))
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################################################################################
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# inner-autotools-package -- defines how the configuration, compilation and
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# installation of an autotools package should be done, implements a
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