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To: Andre McCurdy <armccurdy@gmail.com>, "Burton, Ross" <ross.burton@intel.com>
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From: Mark Hatle <mark.hatle@windriver.com>
Organization: Wind River Systems
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Date: Mon, 8 Feb 2016 18:01:17 -0600
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Cc: OE Core mailing list <openembedded-core@lists.openembedded.org>
Subject: Re: TARGET_CFLAGS for non-target builds
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On 2/8/16 5:43 PM, Andre McCurdy wrote:
> On Mon, Feb 8, 2016 at 3:00 PM, Burton, Ross <ross.burton@intel.com> wrote:
>>
>> On 8 February 2016 at 20:03, Andre McCurdy <armccurdy@gmail.com> wrote:
>>>
>>> Can you give an example? Looking at native.bbclass it seems to replace
>>> TARGET_CFLAGS with BUILD_CFLAGS, not manipulate it.
>>
>> Sure, so in doing a native build TARGET_CFLAGS is used.  But as
>> security_flags.inc was using TARGET_CFLAGS_append, the end result was
>> BUILD_CFLAGS appended with the security flags.
> 
> Yes, for native, TARGET_CFLAGS will end up being "${BUILD_CFLAGS}
> ${SECURITY_CFLAGS}".
> 
> However it shouldn't matter - native.bbclass sets CFLAGS to
> BUILD_CFLAGS, not TARGET_CFLAGS.
> 
> Do you have an example where host gcc can legitimately be invoked with
> TARGET_CFLAGS?

You have to remember the order of the operators.  _append says to make the
append, AFTER everything else has been evaluated (and before _remove).  This
includes override behaviors.

So if you do:

TARGET_CFLAGS = "-deadbeef"
BUILD_CFLAGS = "-badc0ffee"
TARGET_CFLAGS_append = " -foobar"
TARGET_CFLAGS = "${BUILD_CFLAGS}"

The final value of TARGET_CFLAGS is "-badc0ffee -foobar"

Thus by changing the append to:

TARGET_CFLAGS_append_class-target = " -foobar"
TARGET_CFLAGS_class-native = "${BUILD_CFLAGS}"

In the case where the 'class-target' is the override you will get:

TARGET_CFLAGS = "-deadbeef -foobar"

In the case where the 'class-native' is the override you will get:

TARGET_CFLAGS = "-badc0ffee"

--Mark