[U-Boot] [PATCH] tools: Makefile: improve cross_tools target usability
When building the cross_tools target, HOSTCFLAGS and HOSTLDFLAGS will propagate to the target build. This should not happen and is easy to prevent.
Signed-off-by: Stefan Müller-Klieser s.mueller-klieser@phytec.de --- tools/Makefile | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/tools/Makefile b/tools/Makefile index 400588c..305336c 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -263,6 +263,8 @@ subdir- += env
ifneq ($(CROSS_BUILD_TOOLS),) HOSTCC = $(CC) +HOSTCFLAGS = $(CFLAGS) +HOSTLDFLAGS = $(LDFLAGS)
quiet_cmd_crosstools_strip = STRIP $^ cmd_crosstools_strip = $(STRIP) $^; touch $@
On 10/31/2016 02:15 PM, Stefan Müller-Klieser wrote:
When building the cross_tools target, HOSTCFLAGS and HOSTLDFLAGS will propagate to the target build. This should not happen and is easy to prevent.
Signed-off-by: Stefan Müller-Klieser s.mueller-klieser@phytec.de
+CC Masahiro Yamada-san .
tools/Makefile | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/tools/Makefile b/tools/Makefile index 400588c..305336c 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -263,6 +263,8 @@ subdir- += env
ifneq ($(CROSS_BUILD_TOOLS),) HOSTCC = $(CC) +HOSTCFLAGS = $(CFLAGS) +HOSTLDFLAGS = $(LDFLAGS)
quiet_cmd_crosstools_strip = STRIP $^ cmd_crosstools_strip = $(STRIP) $^; touch $@
Hi.
2016-10-31 22:15 GMT+09:00 Stefan Müller-Klieser s.mueller-klieser@phytec.de:
When building the cross_tools target, HOSTCFLAGS and HOSTLDFLAGS will propagate to the target build. This should not happen and is easy to prevent.
Signed-off-by: Stefan Müller-Klieser s.mueller-klieser@phytec.de
tools/Makefile | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/tools/Makefile b/tools/Makefile index 400588c..305336c 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -263,6 +263,8 @@ subdir- += env
ifneq ($(CROSS_BUILD_TOOLS),) HOSTCC = $(CC) +HOSTCFLAGS = $(CFLAGS) +HOSTLDFLAGS = $(LDFLAGS)
In the current U-Boot build system (= Kbuild), CFLAGS is never set, never referenced.
For the target build, KBUILD_CFLAGS is used instead.
So, $(CFLAGS) is always empty unless your environment explicitly sets it. Likewise for LDFLAGS.
Did you mean
HOSTCFLAGS = HOSTLDFLAGS =
or
HOSTCFLAGS = $(KBUILD_CFLAGS) HOSTLDFLAGS =
?
On 05.11.2016 18:41, Masahiro Yamada wrote:
Hi.
Hi!
2016-10-31 22:15 GMT+09:00 Stefan Müller-Klieser s.mueller-klieser@phytec.de:
When building the cross_tools target, HOSTCFLAGS and HOSTLDFLAGS will propagate to the target build. This should not happen and is easy to prevent.
Signed-off-by: Stefan Müller-Klieser s.mueller-klieser@phytec.de
tools/Makefile | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/tools/Makefile b/tools/Makefile index 400588c..305336c 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -263,6 +263,8 @@ subdir- += env
ifneq ($(CROSS_BUILD_TOOLS),) HOSTCC = $(CC) +HOSTCFLAGS = $(CFLAGS) +HOSTLDFLAGS = $(LDFLAGS)
In the current U-Boot build system (= Kbuild), CFLAGS is never set, never referenced.
For the target build, KBUILD_CFLAGS is used instead.
Well, having the cross_tools target, Kbuild actually creates binaries for two different runtime environments. First we have the u-boot, which is a bare metal app controlled by e.g. the KBUILD_CFLAGS, and then we have the cross tools which are linux userspace binaries. The compilation of the userspace binaries can be very different and kbuild cannot know about it, e.g. it does not make much sense to set compiler defaults, in my opinion,
So, $(CFLAGS) is always empty unless your environment explicitly sets it. Likewise for LDFLAGS.
As intended.
Did you mean
HOSTCFLAGS = HOSTLDFLAGS =
That would certainly fix the current bug. Reading your comments make me think that I should have created two different patches, and I even have one more queued.
or
HOSTCFLAGS = $(KBUILD_CFLAGS) HOSTLDFLAGS =
That being said, no I think that would create even more confusion.
?
Thanks for the review. Looking at the kbuild documentation, the case for CFLAGS and LDFLAGS is actually different, as LDFLAGS are well defined and CFLAGS are not. The case for cross tools is not specified, to my understanding, please correct me. So another proposal would be:
HOSTCFLAGS = $(TARGETCFLAGS) HOSTLDFLAGS = $(TARGETLDFLAGS)
?
Regards, Stefan
participants (3)
-
Marek Vasut -
Masahiro Yamada -
Stefan Müller-Klieser