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SubjectRe: [PATCH v2] parisc: dont unconditionally override CROSS_COMPILE for 64 bit.
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On Mon, 2012-02-27 at 15:59 -0500, Paul Gortmaker wrote:
> Using the 64 bit toolchains from kernel.org[1], one finds that
> you can't build the a500_defconfig, because the Makefile will
> stomp whatever value you have in your env. for CROSS_COMPILE.
>
> This shows up since the kernel.org toolchains for parisc-64
> do not have the "-gnu" prefix, and so you run into it always
> saying hppa64-linux-gnu-gcc not found, regardless of the fact
> you've not got "-gnu" put anywhere into CROSS_COMPILE.
>
> Since you can set CROSS_COMPILE from the environment and/or set
> it in your .config file, there really is no need for it to be
> poked at by the Makefile at all. So just delete it.
>
> [1] ftp://ftp.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.5.2/
>
> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
> ---
>
> [v2: no ifdef/endif -- just delete the offending line.]
>
> diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
> index 55cca1d..a533367 100644
> --- a/arch/parisc/Makefile
> +++ b/arch/parisc/Makefile
> @@ -31,7 +31,6 @@ ifdef CONFIG_64BIT
> UTS_MACHINE := parisc64
> CHECKFLAGS += -D__LP64__=1 -m64
> WIDTH := 64
> -CROSS_COMPILE := hppa64-linux-gnu-
> else # 32-bit
> WIDTH :=
> endif

We can't do that ... it crashes a standard build almost immediately
because it doesn't pick the 64 bit compiler (and we have no biarch
solution).

We need make on a 64 bit config to work out of the box. It breaks
with ?= as JDA pointed out because CROSS_COMPILE is always defined.
Does this satisfy everyone?

James

---

diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
index 55cca1d..19ab7b2 100644
--- a/arch/parisc/Makefile
+++ b/arch/parisc/Makefile
@@ -31,7 +31,11 @@ ifdef CONFIG_64BIT
UTS_MACHINE := parisc64
CHECKFLAGS += -D__LP64__=1 -m64
WIDTH := 64
+
+# FIXME: if no default set, should really try to locate dynamically
+ifeq ($(CROSS_COMPILE),)
CROSS_COMPILE := hppa64-linux-gnu-
+endif
else # 32-bit
WIDTH :=
endif
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