Re: [PATCH 3/3] kbuild: Allow passing additional HOSTCFLAGS and HOSTLDFLAGS

From: Laura Abbott
Date: Thu Apr 05 2018 - 17:51:17 EST

On 04/04/2018 09:59 PM, Masahiro Yamada wrote:
2018-03-29 9:48 GMT+09:00 Laura Abbott <labbott@xxxxxxxxxx>:

Similar to AFLAGS_KBUILD, there may be uses (e.g. hardening) for passing in
additional flags to host programs. Allow these to be passed in from the

Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx>
Documentation/kbuild/kbuild.txt | 9 +++++++++
Makefile | 3 +++
2 files changed, 12 insertions(+)

diff --git a/Documentation/kbuild/kbuild.txt b/Documentation/kbuild/kbuild.txt
index ac2363ea05c5..3751a4bc8596 100644
--- a/Documentation/kbuild/kbuild.txt
+++ b/Documentation/kbuild/kbuild.txt
@@ -24,6 +24,15 @@ KAFLAGS
Additional options to the assembler (for built-in and modules).

+Additional options passed to the compiler when building host programs.
+Additional options passed to the linker (through the compiler) when buidling
+host programs.

I am afraid you misunderstood the meaning of 'AFLAGS'.

AFLAGS is not 'Additional flags', but 'Assembler flags'
that are used for compiling *.S files.

AFLAGS for host programs is weird.

I see similar proposals from different people.

I replied like follows:

However, Robin seems busy lately.

I will wait a bit, then
if nobody does this, I may do it.

Thanks for the pointer. I'll keep an eye out for those patches.

Additional module specific options to use for $(AS).
diff --git a/Makefile b/Makefile
index 7ba478ab8c82..2cab3f8d489c 100644
--- a/Makefile
+++ b/Makefile
@@ -367,6 +367,9 @@ HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)

# Make variables (CC, etc...)

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