I was just in the process of creating a native
arm-softfloat-linux-gnu-gcc on i486-pc-linux-gnu. The crossdev toolchain
was setup flawlessly, but when I attempted to cross-compile gcc, I ran
into some very strange errors.
About half-way through the configure stage, configure began
re-identifying the host and build systems.
The issue was that the flags --enable-serial-host --enable-serial-target
--enable-serial-build were not passed when the operation was determined
to be a cross-compilation.
Moreover, I noticed that the is_crosscompile() function in the same file
was incorrect - can someone please verify this? I'm fairly positive from
the gcc configuration script.
For a regular cross-compile, CHOST != CBUILD, and CHOST == CTARGET.
However, when performing a Canadian-cross (building a compiler on CBUILD
intended to run on CHOST, to compile binaries for CTARGET) both CHOST !=
CTARGET and CBUILD != CTARGET.
The point is though, that even for straight cross-compiles it's usually
more dependent on CHOST being set to a different architecture than CTARGET.
My patch is included as an attachment, feel free to remove the
is_crosscompile() section if I'm in error there, but the first section
will properly cross-compile a compiler.
~/Chris
--- toolchain.eclass_old 2007-08-30 18:34:01.000000000 +0000
+++ toolchain.eclass 2007-08-30 18:35:27.000000000 +0000
@@ -54,7 +54,14 @@
fi
fi
is_crosscompile() {
- [[ ${CHOST} != ${CTARGET} ]]
+ # [[ ${CHOST} != ${CTARGET} ]]
+
+ # Note: The definition of a cross compile is when CBUILD != CHOST,
+ # or equivalently, CBUILD != CTARGET for straight cross-compiles.
+ # CHOST differs from CTARGET only for a Canadian Cross. -- cfriedt
+
+ [[ ${CBUILD} != ${CTARGET} ]]
+
}
tc_version_is_at_least() { version_is_at_least "$1" "${2:-${GCC_PV}}" ; }
@@ -1225,14 +1232,22 @@
--infodir=${DATAPATH}/info \
--with-gxx-include-dir=${STDCXX_INCDIR}"
+ # Note: The definition of a cross compile is when CBUILD != CHOST,
+ # or equivalently, CBUILD != CTARGET . CHOST and CTARGET because
+ # are only different for a Canadian Cross. -- cfriedt
+
# All our cross-compile logic goes here ! woo !
confgcc="${confgcc} --host=${CHOST}"
if is_crosscompile || tc-is-cross-compiler ; then
+
# Straight from the GCC install doc:
# "GCC has code to correctly determine the correct value for
target
# for nearly all native systems. Therefore, we highly recommend
you
# not provide a configure target when configuring a native
compiler."
confgcc="${confgcc} --target=${CTARGET}"
+
+ # prevents things (like gcc) from resetting CHOST / CTARGET
half-way during the configure / make process
+ confgcc="${confgcc} --enable-serial-host --enable-serial-target
--enable-serial-build"
fi
[[ -n ${CBUILD} ]] && confgcc="${confgcc} --build=${CBUILD}"
