What should I do to enable multilib in gcc-4.7? 

I think at the moment, in gcc-configure-common.inc, it is disabled.

If I were to re-enable it as follows, based on what I've diff'd from the Denx ELDK repo, what how does the GCCMULTILIB variable evaluate?

-GCCMULTILIB = "--disable-multilib"

+GCCMULTILIB = '${@base_contains("MULTILIB_ARCH_LIST", "${TARGET_ARCH}", "--enable-multilib", "--disable-multilib",d)}'

I think multilib has to be enabled, no? 

In file gcc/config/rs6000/t-ppcos.c

# Multilibs for a powerpc hosted ELF target (linux, SVR4)

MULTILIB_OPTIONS = msoft-float

MULTILIB_DIRNAMES = nof

MULTILIB_EXTRA_OPTS = fPIC mstrict-align

MULTILIB_EXCEPTIONS = 

MULTILIB_MATCHES = ${MULTILIB_MATCHES_FLOAT}

Here is the full patch, which I am assuming enables multilib, and get libgcc to generate the nof libraries to the target:

diff --git a/meta/recipes-devtools/gcc/gcc-configure-common.inc b/meta/recipes-devtools/gcc/gcc-configure-common.inc

index 908ad3e..a3fa294 100644

--- a/meta/recipes-devtools/gcc/gcc-configure-common.inc

+++ b/meta/recipes-devtools/gcc/gcc-configure-common.inc

@@ -25,7 +25,7 @@ EXTRA_OECONF_PATHS ?= ""

 EXTRA_OECONF_INITIAL ?= ""

 EXTRA_OECONF_INTERMEDIATE ?= ""

 

-GCCMULTILIB = "--disable-multilib"

+GCCMULTILIB = '${@base_contains("MULTILIB_ARCH_LIST", "${TARGET_ARCH}", "--enable-multilib", "--disable-multilib",d)}'

 

 EXTRA_OECONF = "${@['--enable-clocale=generic', ''][d.getVar('USE_NLS', True) != 'no']} \

                 --with-gnu-ld \

diff --git a/meta/recipes-devtools/gcc/libgcc_4.7.bb b/meta/recipes-devtools/gcc/libgcc_4.7.bb

index c796253..aac81f6 100644

--- a/meta/recipes-devtools/gcc/libgcc_4.7.bb

+++ b/meta/recipes-devtools/gcc/libgcc_4.7.bb

@@ -18,7 +18,9 @@ FILES_${PN} = "${base_libdir}/libgcc*.so.*"

 FILES_${PN}-dev = " \

   ${base_libdir}/libgcc*.so \

   ${libdir}/${TARGET_SYS}/${BINV}/*crt* \

-  ${libdir}/${TARGET_SYS}/${BINV}/libgcc*"

+  ${libdir}/${TARGET_SYS}/${BINV}/libgcc* \

+  ${libdir}/${TARGET_SYS}/${BINV}/nof/crt* \

+  ${libdir}/${TARGET_SYS}/${BINV}/nof/libgcc*"

 FILES_libgcov${PKGSUFFIX}-dev = " \

   ${libdir}/${TARGET_SYS}/${BINV}/libgcov.a \

   "