From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sylvain Raybaud Date: Tue, 14 Oct 2014 12:58:48 +0200 Subject: [Buildroot] using BR2 variables to find a specific header file In-Reply-To: References: <543C0775.3090701@green-communications.fr> Message-ID: <543D01E8.80401@green-communications.fr> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Mike, Samuel, all, On 13/10/2014 21:42, Samuel Martin wrote: > Hi Sylvain, > > On Mon, Oct 13, 2014 at 7:10 PM, Sylvain Raybaud > wrote: [...] >> During cross-compile these tests cannot be run therefore the >> package expects -DSTACK_DIRECTION=+/-1 to be passed to cmake. Of >> course you cannot do it in buildroot. > > Why do you say that? Of course, Buildroot does support adding cmake > configure options [1]. You can also check some cmake-based packages > already integrated (e.g.: [2]). I mean I can pass arguments to cmake but if I hardcode a value I break compatibility with any platform that would require the other value. However... > > If you know beforehand how grow the stack, I would suggest to set > it in the *_CONF_OPTS variables. This may depends on the target > architecture. > >> It seems to be possible to access this information in another >> way since STACK_GROWS_DOWNWARD is defined in some headers. [...] > > This does not look right :-/ because: - it search in something not > in the sysroot; - it is only valid when using the > buildroot-toolchain backend. > > Indeed, it seems the STACK_GROWS_DOWNWARD definition is only > available in the compiler sources, not in the preprocessor output > for the target :-/ > >> [...] > > Instead of checking the compiler sources, I prefer you set the > stack growing direction through the CMake args. > > Regards, Mark's reply and yours strongly suggest that it's a better idea to hardcode the correct value. I shall do so! Thanks a lot! Cheers, - -- Sylvain Raybaud www.green-communications.fr -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJUPQHnAAoJEEkkwl4JtJ9y8SEQAKFGepXykyQ/IdW5Y4oyOC1P C1Qxjkve4/JlGQlhn14zeUFSbBoNGoZrpEwaER/ygfiTUZtITdRwvW6SyZhdXGPs m4DkznR1+/ZCOCQdEglyON54VHGQU4l5caC0vbXENhjcMyLivCv1Ue8tGNO0yP4y HfxXqPBQHe79cHeIJwpiYn6wFlDxLTZmhOs9BxfxTCVCQr1nWPW7SqOKnHfaj5Us SdHZ2OPVI9M7IuNWDHdHayQoXcbiOHveb7Bh1FJY8GpK8F3CbVXZ/E/l+yxWU8mc CoZhQy3sJG0IAUZ+JerkTN1h15RsSyHJb6lKhE7zQ+LIhiuhj2dJNntwQ0eJCRRV G3h2NQti0T6ez8IuNmNJ58UEUQ72y26Ys1oU8LQfX2ZkJNmMeQlzlFGcESWkvW5B 4E059eSSHIhBH5j2slpYDe/622dIy8s/Wd5E6ww55lCwxFJJ4RmHKwC3u1YcXZO+ z/nB4I9Qmukfq1IXrUxCPgM4v95Z6eCjROFIb/n7/OSCJ5J2f0vi6WBczfonzoyK tG0sOsub9ZQjUzAI1C8iqUn+W8eEeed7V1jVuLswP3Zvx2yByaNidcjHB2CM6UUk j6GcXOTqMAS5L7Bv/95akn8EJ1w0nyZnmuy1gBU0sGekNWE/uooTHPfoFAgivKnE CetDbXUvZLStUnYcL3yw =dO+1 -----END PGP SIGNATURE-----