linux-kernel - [PATCHv2 7/7] Kbuild: Use HOST*FLAGS options from the command line

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Date:   Mon,  9 Jul 2018 17:46:02 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Laura Abbott <labbott@...hat.com>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, Robin Jarry <robin.jarry@...nd.com>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org
Subject: [PATCHv2 7/7] Kbuild: Use HOST*FLAGS options from the command line


Now that we have the rename in place, reuse the HOST*FLAGS options as
something that can be set from the command line and included with the
rest of the flags.

Signed-off-by: Laura Abbott <labbott@...hat.com>
---
v2: Use the correct name for HOSTLDLIBS, update documentation.
---
 Documentation/kbuild/kbuild.txt | 16 ++++++++++++++++
 Makefile                        |  9 +++++----
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/Documentation/kbuild/kbuild.txt b/Documentation/kbuild/kbuild.txt
index 6c9c69ec3986..9847a5974826 100644
--- a/Documentation/kbuild/kbuild.txt
+++ b/Documentation/kbuild/kbuild.txt
@@ -238,3 +238,19 @@ KBUILD_VMLINUX_LIBS
 All .a "lib" files for vmlinux.
 KBUILD_VMLINUX_INIT, KBUILD_VMLINUX_MAIN, and KBUILD_VMLINUX_LIBS together
 specify all the object files used to link vmlinux.
+
+HOSTCFLAGS
+--------------------------------------------------
+Additional flags to be passed to $(HOSTCC) when building host programs.
+
+HOSTLDFLAGS
+--------------------------------------------------
+Additional flags to be passed to $(HOSTLD) when building host programs.
+
+HOSTCXXFLAGS
+--------------------------------------------------
+Additional flags to be passed to $(HOSTCXX) when building host programs.
+
+HOSTLDLIBS
+--------------------------------------------------
+Additional libraries to link against when building host programs.
diff --git a/Makefile b/Makefile
index 96e34381d9ee..c2ee1d4c12c9 100644
--- a/Makefile
+++ b/Makefile
@@ -360,10 +360,11 @@ HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
 HOSTCC       = gcc
 HOSTCXX      = g++
 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
-		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
-KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
-KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
-KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS)
+		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
+		$(HOSTCFLAGS)
+KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
+KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
+KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 
 # Make variables (CC, etc...)
 AS		= $(CROSS_COMPILE)as
-- 
2.17.1