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Subject[RFC PATCH 2/2] tools build: Take CC, AS, and LD from the command line
Date
If the top-level tools build is called to build a tool and is passed
CC, AS, or LD on the command line then someone wants to use a
different compiler, assembler, or linker. Let's honor that.

This together with the change ("kbuild: Pass HOSTCC and similar to
tools Makefiles") allows us to properly get the HOST C Compiler used
when the main kernel Makefile calls into the tools.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

tools/scripts/Makefile.include | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/tools/scripts/Makefile.include b/tools/scripts/Makefile.include
index 9dc8f078a83c..00261848ec54 100644
--- a/tools/scripts/Makefile.include
+++ b/tools/scripts/Makefile.include
@@ -10,6 +10,20 @@ endif
endif
endif

+SUBMAKE_ARGS :=
+
+# If CC, LD, or AR were passed on the command line, pass them through to the
+# command line of the sub-tools.
+ifeq ($(origin CC), command line)
+ SUBMAKE_ARGS += "CC=$(CC)"
+endif
+ifeq ($(origin LD), command line)
+ SUBMAKE_ARGS += "LD=$(LD)"
+endif
+ifeq ($(origin AR), command line)
+ SUBMAKE_ARGS += "AR=$(ar)"
+endif
+
# check that the output directory actually exists
ifneq ($(OUTPUT),)
OUTDIR := $(realpath $(OUTPUT))
@@ -71,7 +85,9 @@ endif
#
descend = \
+mkdir -p $(OUTPUT)$(1) && \
- $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
+ $(MAKE) $(SUBMAKE_ARGS) $(COMMAND_O) \
+ subdir=$(if $(subdir),$(subdir)/$(1),$(1)) \
+ $(PRINT_DIR) -C $(1) $(2)

QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir
QUIET_SUBDIR1 =
@@ -94,7 +110,9 @@ ifneq ($(silent),1)
descend = \
+@echo ' DESCEND '$(1); \
mkdir -p $(OUTPUT)$(1) && \
- $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
+ $(MAKE) $(SUBMAKE_ARGS) $(COMMAND_O) \
+ subdir=$(if $(subdir),$(subdir)/$(1),$(1)) \
+ $(PRINT_DIR) -C $(1) $(2)

QUIET_CLEAN = @printf ' CLEAN %s\n' $1;
QUIET_INSTALL = @printf ' INSTALL %s\n' $1;
--
2.14.2.920.gcf0c67979c-goog
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