package/rustc: RUSTC_TARGET_NAME is needed to build host-rust

As reported on bugzilla [1], the host-rust package fail when
the target architecture or the target libc is not supported.

The error is the following:
failed to parse TOML configuration 'config.toml': expected a table key, found a right bracket at line 15

In such case BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS is
not set thus RUSTC_TARGET_NAME is also not set [2].

But RUSTC_TARGET_NAME is needed to generate the file config.toml [3]

Add BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS in the host-rust
dependency.

The commit [4] that allowed to select host-rust when the target
architecture or the target libc is not supported, should have
allowed to select only host-rustc-bin.

Fixes:
Bug #12691

[1] https://bugs.busybox.net/show_bug.cgi?id=12691
[2] https://git.buildroot.net/buildroot/tree/package/rustc/rustc.mk?h=2020.05-rc1#n10
[3] https://git.buildroot.net/buildroot/tree/package/rust/rust.mk?h=2020.05-rc1#n41
[4] 025b863e6facb7b219b82ee6ee7a7916c2c3c47e

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Sam Voss <sam.voss@gmail.com>
Reviewed-by: Sam Voss <sam.voss@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

diff --git a/package/rustc/Config.in.host b/package/rustc/Config.in.host
index d595efbc6f9add12755b16b52aae1e8f8ca7b24b..1df25ae326d4a881657c38cb8817b79a8c2a83c6 100644 (file)
--- a/package/rustc/Config.in.host
+++ b/package/rustc/Config.in.host
@@ -49,6 +49,9 @@ choice
 
 config BR2_PACKAGE_HOST_RUST
        bool "host rust"
+       # RUSTC_TARGET_NAME must be set for building host-rust
+       # otherwise config.toml is broken.
+       depends on BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS
        # triggers ICE on trunc_int_for_mode, at explow.c:56
        depends on BR2_TOOLCHAIN_GCC_AT_LEAST_5 || !BR2_aarch64
        help