Re: [PATCH v9 02/10] Makefile: Prepare for using macros for inline asm

[Nadav Amit]

From: Logan Gunthorpe
Sent: November 6, 2018 at 6:57:57 PM GMT
> To: Nadav Amit <namit@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx>, Sam Ravnborg <sam@xxxxxxxxxxxx>, Michal Marek <michal.lkml@xxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, H. Peter Anvin <hpa@xxxxxxxxx>, linux-kbuild@xxxxxxxxxxxxxxx>, Stephen Bates <sbates@xxxxxxxxxxxx>
> Subject: Re: [PATCH v9 02/10] Makefile: Prepare for using macros for inline asm
> 
> 
> 
> 
> On 2018-10-03 3:30 p.m., Nadav Amit wrote:
>> +ASM_MACRO_FLAGS = -Wa,arch/x86/kernel/macros.s -Wa,-
>> +export ASM_MACRO_FLAGS
>> +KBUILD_CFLAGS += $(ASM_MACRO_FLAGS)
> 
> I'm not sure how much we care about this or what we can do about it, but
> adding the macros.s to the command line like this has effectively broken
> distributed compiling with distcc and icecc as of v4.20-rc1. Neither
> tool will successfully distribute any compile processes because the
> non-local machines won't have a copy of macros.s.

Err.. I donât have a dist-cc environment. I wonder whether something like
that would do the trick:

-- >8 â

Subject: [PATCH] x86: Fix dist-cc

---
 arch/x86/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 5b562e464009..81d76cbcffff 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -237,9 +237,9 @@ archheaders:
 	$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
 
 archmacros:
-	$(Q)$(MAKE) $(build)=arch/x86/kernel arch/x86/kernel/macros.s
+	$(Q)$(MAKE) $(build)=arch/x86/kernel ${objtree}/arch/x86/kernel/macros.s
 
-ASM_MACRO_FLAGS = -Wa,arch/x86/kernel/macros.s -Wa,-
+ASM_MACRO_FLAGS = -Wa,${objtree}/arch/x86/kernel/macros.s -Wa,-
 export ASM_MACRO_FLAGS
 KBUILD_CFLAGS += $(ASM_MACRO_FLAGS)
 
-- 
2.17.1