linux-kernel - [PATCH 3/3] kbuild: Allow passing additional HOSTCFLAGS and HOSTLDFLAGS

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Date:   Wed, 28 Mar 2018 17:48:05 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>
Cc:     Laura Abbott <labbott@...hat.com>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, Josh Poimboeuf <jpoimboe@...hat.com>
Subject: [PATCH 3/3] kbuild: Allow passing additional HOSTCFLAGS and HOSTLDFLAGS


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
environment.

Signed-off-by: Laura Abbott <labbott@...hat.com>
---
 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).
 
+AFLAGS_HOSTCFLAGS
+--------------------------------------------------
+Additional options passed to the compiler when building host programs.
+
+AFLAGS_HOSTLDFLAGS
+--------------------------------------------------
+Additional options passed to the linker (through the compiler) when buidling
+host programs.
+
 AFLAGS_MODULE
 --------------------------------------------------
 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)
 HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
 HOST_LOADLIBES := $(HOST_LFS_LIBS)
 
+HOSTCFLAGS  += $(AFLAGS_HOSTCFLAGS)
+HOSTLDFLAGS  += $(AFLAGS_HOSTLDFLAGS)
+
 # Make variables (CC, etc...)
 AS		= $(CROSS_COMPILE)as
 LD		= $(CROSS_COMPILE)ld
-- 
2.16.2