multilib.eclass: fix cross-compiling multilib ebuilds

Current code assumes that CBUILD is always the same as CHOST, however it
is desirable to allow cross compiling into multilib sysroots, where
obviously the assumed condition does not hold anymore. To fix this,
let's override CBUILD only if original CHOST and CBUILD are equal, i.e.
we are not cross-compiling.

diff --git a/eclass/multilib.eclass b/eclass/multilib.eclass
index 956f3aeed88979cc32d6167caa245fb93c321c52..350b6f949d12ea33019116d2d29abb547fa46e1c 100644 (file)
--- a/eclass/multilib.eclass
+++ b/eclass/multilib.eclass
@@ -450,6 +450,11 @@ multilib_toolchain_setup() {
                done
                export _DEFAULT_ABI_SAVED="true"
 
+               # Set CBUILD only if not cross-compiling.
+               if [[ ${CBUILD} == "${CHOST}" ]]; then
+                       export CBUILD=$(get_abi_CHOST $1)
+               fi
+
                # Set the CHOST native first so that we pick up the native
                # toolchain and not a cross-compiler by accident #202811.
                export CHOST=$(get_abi_CHOST ${DEFAULT_ABI})
@@ -459,7 +464,6 @@ multilib_toolchain_setup() {
                export FC="$(tc-getFC) $(get_abi_CFLAGS)"
                export LD="$(tc-getLD) $(get_abi_LDFLAGS)"
                export CHOST=$(get_abi_CHOST $1)
-               export CBUILD=$(get_abi_CHOST $1)
                export PKG_CONFIG_LIBDIR=${EPREFIX}/usr/$(get_libdir)/pkgconfig
                export PKG_CONFIG_PATH=${EPREFIX}/usr/share/pkgconfig
        fi