There's not much sense in doing that because if user or
his build-system didn't set CROSS_COMPILE we still may
very well make incorrect guess.
But as it turned out setting CROSS_COMPILE is not as harmless
as one may think: with recent changes that implemented automatic
discovery of __host__ gcc features unconditional setup of
CROSS_COMPILE leads to failures on execution of "make xxx_defconfig"
with absent cross-compiler, for more info see [1].
Set CROSS_COMPILE as well gets in the way if we want only to build
.dtb's (again with absent cross-compiler which is not really needed
for building .dtb's), see [2].
Note, we had to change LIBGCC assignment type from ":=" to "="
so that is is resolved on its usage, otherwise if it is resolved
at declaration time with missing CROSS_COMPILE we're getting this
error message from host GCC:
------------------------->8-------------------------
gcc: error: unrecognized command line option ‘-mmedium-calls’
gcc: error: unrecognized command line option ‘-mno-sdata’; did you mean ‘-fno-stats’?
------------------------->8-------------------------
[1] http://lists.infradead.org/pipermail/linux-snps-arc/2018-September/004308.html
[2] http://lists.infradead.org/pipermail/linux-snps-arc/2018-September/004320.html
Signed-off-by: Alexey Brodkin <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Rob Herring <[email protected]>
---
arch/arc/Makefile | 10 +---------
1 file changed, 1 insertion(+), 9 deletions(-)
diff --git a/arch/arc/Makefile b/arch/arc/Makefile
index 99cce77ab98f..5f6b67917dc2 100644
--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -6,14 +6,6 @@
# published by the Free Software Foundation.
#
-ifeq ($(CROSS_COMPILE),)
-ifndef CONFIG_CPU_BIG_ENDIAN
-CROSS_COMPILE := arc-linux-
-else
-CROSS_COMPILE := arceb-linux-
-endif
-endif
-
KBUILD_DEFCONFIG := nsim_700_defconfig
cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__
@@ -79,7 +71,7 @@ cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
-LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
+LIBGCC = $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
# Modules with short calls might break for calls into builtin-kernel
KBUILD_CFLAGS_MODULE += -mlong-calls -mno-millicode
--
2.17.1
Hello,
> -----Original Message-----
> From: Alexey Brodkin [mailto:[email protected]]
> Sent: Sunday, September 16, 2018 11:48 PM
> To: [email protected]
> Cc: [email protected]; Vineet Gupta <[email protected]>; Alexey Brodkin <[email protected]>; Masahiro
> Yamada <[email protected]>; Rob Herring <[email protected]>
> Subject: [PATCH] ARC: Don't set CROSS_COMPILE in arch's Makefile
>
> There's not much sense in doing that because if user or
> his build-system didn't set CROSS_COMPILE we still may
> very well make incorrect guess.
>
> But as it turned out setting CROSS_COMPILE is not as harmless
> as one may think: with recent changes that implemented automatic
> discovery of __host__ gcc features unconditional setup of
> CROSS_COMPILE leads to failures on execution of "make xxx_defconfig"
> with absent cross-compiler, for more info see [1].
>
> Set CROSS_COMPILE as well gets in the way if we want only to build
> .dtb's (again with absent cross-compiler which is not really needed
> for building .dtb's), see [2].
>
> Note, we had to change LIBGCC assignment type from ":=" to "="
> so that is is resolved on its usage, otherwise if it is resolved
> at declaration time with missing CROSS_COMPILE we're getting this
> error message from host GCC:
> ------------------------->8-------------------------
> gcc: error: unrecognized command line option ‘-mmedium-calls’
> gcc: error: unrecognized command line option ‘-mno-sdata’; did you mean ‘-fno-stats’?
> ------------------------->8-------------------------
>
> [1] http://lists.infradead.org/pipermail/linux-snps-arc/2018-September/004308.html
> [2] http://lists.infradead.org/pipermail/linux-snps-arc/2018-September/004320.html
>
> Signed-off-by: Alexey Brodkin <[email protected]>
> Cc: Masahiro Yamada <[email protected]>
> Cc: Rob Herring <[email protected]>
> ---
> arch/arc/Makefile | 10 +---------
> 1 file changed, 1 insertion(+), 9 deletions(-)
>
> diff --git a/arch/arc/Makefile b/arch/arc/Makefile
> index 99cce77ab98f..5f6b67917dc2 100644
> --- a/arch/arc/Makefile
> +++ b/arch/arc/Makefile
> @@ -6,14 +6,6 @@
> # published by the Free Software Foundation.
> #
>
> -ifeq ($(CROSS_COMPILE),)
> -ifndef CONFIG_CPU_BIG_ENDIAN
> -CROSS_COMPILE := arc-linux-
> -else
> -CROSS_COMPILE := arceb-linux-
> -endif
> -endif
> -
> KBUILD_DEFCONFIG := nsim_700_defconfig
>
> cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__
> @@ -79,7 +71,7 @@ cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
> cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
> ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
>
> -LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
> +LIBGCC = $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
>
> # Modules with short calls might break for calls into builtin-kernel
> KBUILD_CFLAGS_MODULE += -mlong-calls -mno-millicode
> --
> 2.17.1
May we have this one back-ported to stable branches?
Upstream commit in Linus' tree is:
40660f1fcee8 ("ARC: build: Don't set CROSS_COMPILE in arch's Makefile").
Regards,
Alexey
On Wed, Oct 17, 2018 at 02:33:02PM +0000, Alexey Brodkin wrote:
> Hello,
>
> > -----Original Message-----
> > From: Alexey Brodkin [mailto:[email protected]]
> > Sent: Sunday, September 16, 2018 11:48 PM
> > To: [email protected]
> > Cc: [email protected]; Vineet Gupta <[email protected]>; Alexey Brodkin <[email protected]>; Masahiro
> > Yamada <[email protected]>; Rob Herring <[email protected]>
> > Subject: [PATCH] ARC: Don't set CROSS_COMPILE in arch's Makefile
> >
> > There's not much sense in doing that because if user or
> > his build-system didn't set CROSS_COMPILE we still may
> > very well make incorrect guess.
> >
> > But as it turned out setting CROSS_COMPILE is not as harmless
> > as one may think: with recent changes that implemented automatic
> > discovery of __host__ gcc features unconditional setup of
> > CROSS_COMPILE leads to failures on execution of "make xxx_defconfig"
> > with absent cross-compiler, for more info see [1].
> >
> > Set CROSS_COMPILE as well gets in the way if we want only to build
> > .dtb's (again with absent cross-compiler which is not really needed
> > for building .dtb's), see [2].
> >
> > Note, we had to change LIBGCC assignment type from ":=" to "="
> > so that is is resolved on its usage, otherwise if it is resolved
> > at declaration time with missing CROSS_COMPILE we're getting this
> > error message from host GCC:
> > ------------------------->8-------------------------
> > gcc: error: unrecognized command line option ‘-mmedium-calls’
> > gcc: error: unrecognized command line option ‘-mno-sdata’; did you mean ‘-fno-stats’?
> > ------------------------->8-------------------------
> >
> > [1] http://lists.infradead.org/pipermail/linux-snps-arc/2018-September/004308.html
> > [2] http://lists.infradead.org/pipermail/linux-snps-arc/2018-September/004320.html
> >
> > Signed-off-by: Alexey Brodkin <[email protected]>
> > Cc: Masahiro Yamada <[email protected]>
> > Cc: Rob Herring <[email protected]>
> > ---
> > arch/arc/Makefile | 10 +---------
> > 1 file changed, 1 insertion(+), 9 deletions(-)
> >
> > diff --git a/arch/arc/Makefile b/arch/arc/Makefile
> > index 99cce77ab98f..5f6b67917dc2 100644
> > --- a/arch/arc/Makefile
> > +++ b/arch/arc/Makefile
> > @@ -6,14 +6,6 @@
> > # published by the Free Software Foundation.
> > #
> >
> > -ifeq ($(CROSS_COMPILE),)
> > -ifndef CONFIG_CPU_BIG_ENDIAN
> > -CROSS_COMPILE := arc-linux-
> > -else
> > -CROSS_COMPILE := arceb-linux-
> > -endif
> > -endif
> > -
> > KBUILD_DEFCONFIG := nsim_700_defconfig
> >
> > cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__
> > @@ -79,7 +71,7 @@ cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
> > cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
> > ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
> >
> > -LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
> > +LIBGCC = $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
> >
> > # Modules with short calls might break for calls into builtin-kernel
> > KBUILD_CFLAGS_MODULE += -mlong-calls -mno-millicode
> > --
> > 2.17.1
>
> May we have this one back-ported to stable branches?
>
> Upstream commit in Linus' tree is:
> 40660f1fcee8 ("ARC: build: Don't set CROSS_COMPILE in arch's Makefile").
Applied to 4.9.y, 4.14.y, and 4.18.y, thanks.
greg k-h
On 9/16/18 1:47 PM, Alexey Brodkin wrote:
> There's not much sense in doing that because if user or
> his build-system didn't set CROSS_COMPILE we still may
> very well make incorrect guess.
>
> But as it turned out setting CROSS_COMPILE is not as harmless
> as one may think: with recent changes that implemented automatic
> discovery of __host__ gcc features unconditional setup of
> CROSS_COMPILE leads to failures on execution of "make xxx_defconfig"
> with absent cross-compiler, for more info see [1].
>
> Set CROSS_COMPILE as well gets in the way if we want only to build
> .dtb's (again with absent cross-compiler which is not really needed
> for building .dtb's), see [2].
@Alexey, can we revisit this (revert back partially). I'm getting sick of having
to specify the CROSS_COMPILE in my cmdline.
Will something along the lines fc2b47b55f17fd996f7a019 ("h8300: use
cc-cross-prefix instead of hardcoding h8300-unknown-linux-") work ?
---->
+ifeq ($(CROSS_COMPILE),)
+CROSS_COMPILE := $(call cc-cross-prefix, arc-linux-)
+endif
>
> Note, we had to change LIBGCC assignment type from ":=" to "="
> so that is is resolved on its usage, otherwise if it is resolved
> at declaration time with missing CROSS_COMPILE we're getting this
> error message from host GCC:
> ------------------------->8-------------------------
> gcc: error: unrecognized command line option ‘-mmedium-calls’
> gcc: error: unrecognized command line option ‘-mno-sdata’; did you mean ‘-fno-stats’?
> ------------------------->8-------------------------
>
> [1] http://lists.infradead.org/pipermail/linux-snps-arc/2018-September/004308.html
> [2] http://lists.infradead.org/pipermail/linux-snps-arc/2018-September/004320.html
>
> Signed-off-by: Alexey Brodkin <[email protected]>
> Cc: Masahiro Yamada <[email protected]>
> Cc: Rob Herring <[email protected]>
> ---
> arch/arc/Makefile | 10 +---------
> 1 file changed, 1 insertion(+), 9 deletions(-)
>
> diff --git a/arch/arc/Makefile b/arch/arc/Makefile
> index 99cce77ab98f..5f6b67917dc2 100644
> --- a/arch/arc/Makefile
> +++ b/arch/arc/Makefile
> @@ -6,14 +6,6 @@
> # published by the Free Software Foundation.
> #
>
> -ifeq ($(CROSS_COMPILE),)
> -ifndef CONFIG_CPU_BIG_ENDIAN
> -CROSS_COMPILE := arc-linux-
> -else
> -CROSS_COMPILE := arceb-linux-
> -endif
> -endif
> -
> KBUILD_DEFCONFIG := nsim_700_defconfig
>
> cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__
> @@ -79,7 +71,7 @@ cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
> cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
> ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
>
> -LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
> +LIBGCC = $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
>
> # Modules with short calls might break for calls into builtin-kernel
> KBUILD_CFLAGS_MODULE += -mlong-calls -mno-millicode
>