[Buildroot] [PATCH v3 01/10] package/rustc: install cargo config as toolchain post-install hook

[Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>]

The cargo config file is much like the cmake and meson configuration
files, something that tells the cargo build system how the
cross-toolchain is configured. It can be used not only with our own
host-cargo package, but also with a pre-installed cargo.

Therefore, install the cargo config file as a toolchain post-install
hook, just like we do for cmake and meson. However, we don't have a
pkg-cargo infrastructure (yet) so we can't put it there. The cargo
package itself will be removed soon, so that's not appropriate either.
Therefore, put it in the rustc package - any cargo package will need
rustc.

Remove the config handling from the cargo package.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
---
 package/cargo/cargo.mk                             |  6 ------
 package/{cargo/config.in => rustc/cargo-config.in} |  0
 package/rustc/rustc.mk                             | 12 ++++++++++++
 3 files changed, 12 insertions(+), 6 deletions(-)
 rename package/{cargo/config.in => rustc/cargo-config.in} (100%)

diff --git a/package/cargo/cargo.mk b/package/cargo/cargo.mk
index a387281b4c..3f6646d027 100644
--- a/package/cargo/cargo.mk
+++ b/package/cargo/cargo.mk
@@ -80,12 +80,6 @@ endef
 
 define HOST_CARGO_INSTALL_CMDS
 	$(INSTALL) -D -m 0755 $(@D)/target/release/cargo $(HOST_DIR)/bin/cargo
-	$(INSTALL) -D package/cargo/config.in \
-		$(HOST_DIR)/share/cargo/config
-	$(SED) 's/@RUSTC_TARGET_NAME@/$(RUSTC_TARGET_NAME)/' \
-		$(HOST_DIR)/share/cargo/config
-	$(SED) 's/@CROSS_PREFIX@/$(notdir $(TARGET_CROSS))/' \
-		$(HOST_DIR)/share/cargo/config
 endef
 
 $(eval $(host-generic-package))
diff --git a/package/cargo/config.in b/package/rustc/cargo-config.in
similarity index 100%
rename from package/cargo/config.in
rename to package/rustc/cargo-config.in
diff --git a/package/rustc/rustc.mk b/package/rustc/rustc.mk
index 6eea9b4fc5..35ffc36106 100644
--- a/package/rustc/rustc.mk
+++ b/package/rustc/rustc.mk
@@ -20,3 +20,15 @@ endif
 RUSTC_HOST_NAME = $(RUSTC_HOST_ARCH)-unknown-linux-gnu
 
 $(eval $(host-virtual-package))
+
+ifeq ($(BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS),y)
+define RUSTC_INSTALL_CARGO_CONFIG
+	mkdir -p $(HOST_DIR)/share/cargo
+	sed -e 's/@RUSTC_TARGET_NAME@/$(RUSTC_TARGET_NAME)/' \
+		-e 's/@CROSS_PREFIX@/$(notdir $(TARGET_CROSS))/' \
+		package/rustc/cargo-config.in \
+		> $(HOST_DIR)/share/cargo/config
+endef
+# check-package disable TypoInPackageVariable - TOOLCHAIN intended
+TOOLCHAIN_POST_INSTALL_STAGING_HOOKS += RUSTC_INSTALL_CARGO_CONFIG
+endif
-- 
2.24.1