kumquat-buildroot/package/erlang/erlang.mk
Yann E. MORIN b574a9606e package/erlang: do not hard-code the Erlang Interface Version (EI_VSN)
The note above the erlang version instructs to refer to another note
further down the file. However, even if it is not too difficult to find,
it is still located a bit too far away, and the reference is not very
explicit what note we should look at.

When we introduced that variable in 6c1d128844 (package/erlang: export
EI_VSN so other packages can use it), the rationale for hard-coding it
was "to avoid spawning a shell every time the variable is dereferenced".

However, that can get a bit confusing and hard to follow. Also, that in
fact spawns a shell only once for each rebar-packages, so the overhead
is far from being too high.

The EI_VSN is only used by rebar-package packages, is derefrenced from
the rebar-infra and not the packages themselves, and is not needed by
erlang itself (it knows its own EI_VSN), so we can de-hard-code it, and
rely on build-time detection, by looking in the appropriate file.

We have two files where we could look:
  - lib/erl_interface/vsn.mk in the erlang source tree, but it is not
    installed,
  - .../lib/erlang/releases/$(ERLANG_RELASE)/installed_application_versions
    as installed by erlang.

We use the second one, as it is cleaner, for a package, to look into
installed files, rather than to look in the source tree of another
package.

Although both the host and target erlang are the same, we still look
into the corresponding file to extract the version. This is so that it
would be easier if in the future we ever manage to rely on a
system-installed erlang that could have a EI_VSN different from the
target one.

We can't re-use the variable ERLANG_EI_VSN, because it now needs to be
$(call)-ed with a parameter. Hopefully, external packages that use it
directly rather than through the rebar infra, are not legion...

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Will Newton <will.newton@gmail.com>
Cc: Johan Oudinet <johan.oudinet@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2023-08-10 23:07:06 +02:00

107 lines
3.3 KiB
Makefile

################################################################################
#
# erlang
#
################################################################################
# See note below when updating Erlang
ERLANG_VERSION = 26.0.2
ERLANG_RELEASE = $(firstword $(subst ., ,$(ERLANG_VERSION)))
ERLANG_SITE = \
https://github.com/erlang/otp/releases/download/OTP-$(ERLANG_VERSION)
ERLANG_SOURCE = otp_src_$(ERLANG_VERSION).tar.gz
ERLANG_DEPENDENCIES = host-erlang
ERLANG_LICENSE = Apache-2.0
ERLANG_LICENSE_FILES = LICENSE.txt
ERLANG_CPE_ID_VENDOR = erlang
ERLANG_CPE_ID_PRODUCT = erlang\/otp
ERLANG_INSTALL_STAGING = YES
# Patched erts/aclocal.m4
define ERLANG_RUN_AUTOCONF
cd $(@D) && PATH=$(BR_PATH) ./otp_build update_configure --no-commit
endef
ERLANG_DEPENDENCIES += host-autoconf
ERLANG_PRE_CONFIGURE_HOOKS += ERLANG_RUN_AUTOCONF
HOST_ERLANG_DEPENDENCIES += host-autoconf
HOST_ERLANG_PRE_CONFIGURE_HOOKS += ERLANG_RUN_AUTOCONF
# Return the EIV (Erlang Interface Version, EI_VSN)
# $(1): base directory, i.e. either $(HOST_DIR) or $(STAGING_DIR)/usr
erlang_ei_vsn = `sed -r -e '/^erl_interface-(.+)/!d; s//\1/' $(1)/lib/erlang/releases/$(ERLANG_RELEASE)/installed_application_versions`
# The configure checks for these functions fail incorrectly
ERLANG_CONF_ENV = ac_cv_func_isnan=yes ac_cv_func_isinf=yes
# Set erl_xcomp variables. See xcomp/erl-xcomp.conf.template
# for documentation.
ERLANG_CONF_ENV += erl_xcomp_sysroot=$(STAGING_DIR)
ERLANG_CONF_OPTS = --without-javac
# Force ERL_TOP to the downloaded source directory. This prevents
# Erlang's configure script from inadvertantly using files from
# a version of Erlang installed on the host.
ERLANG_CONF_ENV += ERL_TOP=$(@D)
HOST_ERLANG_CONF_ENV += ERL_TOP=$(@D)
# erlang uses openssl for all things crypto. Since the host tools (such as
# rebar) uses crypto, we need to build host-erlang with support for openssl.
HOST_ERLANG_DEPENDENCIES += host-openssl
HOST_ERLANG_CONF_OPTS = --without-javac --with-ssl=$(HOST_DIR)
HOST_ERLANG_CONF_OPTS += --without-termcap
ifeq ($(BR2_PACKAGE_NCURSES),y)
ERLANG_CONF_OPTS += --with-termcap
ERLANG_DEPENDENCIES += ncurses
else
ERLANG_CONF_OPTS += --without-termcap
endif
ifeq ($(BR2_PACKAGE_OPENSSL),y)
ERLANG_CONF_OPTS += --with-ssl
ERLANG_DEPENDENCIES += openssl
else
ERLANG_CONF_OPTS += --without-ssl
endif
ifeq ($(BR2_PACKAGE_UNIXODBC),y)
ERLANG_DEPENDENCIES += unixodbc
ERLANG_CONF_OPTS += --with-odbc
else
ERLANG_CONF_OPTS += --without-odbc
endif
# Always use Buildroot's zlib
ERLANG_CONF_OPTS += --disable-builtin-zlib
ERLANG_DEPENDENCIES += zlib
# Remove source, example, gs and wx files from staging and target.
ERLANG_REMOVE_PACKAGES = gs wx
ifneq ($(BR2_PACKAGE_ERLANG_MEGACO),y)
ERLANG_REMOVE_PACKAGES += megaco
endif
define ERLANG_REMOVE_STAGING_UNUSED
for package in $(ERLANG_REMOVE_PACKAGES); do \
rm -rf $(STAGING_DIR)/usr/lib/erlang/lib/$${package}-*; \
done
endef
define ERLANG_REMOVE_TARGET_UNUSED
find $(TARGET_DIR)/usr/lib/erlang -type d -name src -prune -exec rm -rf {} \;
find $(TARGET_DIR)/usr/lib/erlang -type d -name examples -prune -exec rm -rf {} \;
for package in $(ERLANG_REMOVE_PACKAGES); do \
rm -rf $(TARGET_DIR)/usr/lib/erlang/lib/$${package}-*; \
done
endef
ERLANG_POST_INSTALL_STAGING_HOOKS += ERLANG_REMOVE_STAGING_UNUSED
ERLANG_POST_INSTALL_TARGET_HOOKS += ERLANG_REMOVE_TARGET_UNUSED
$(eval $(autotools-package))
$(eval $(host-autotools-package))