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Oswald Buddenhagen 98c1d516b7 alloca: detect whether alloca.h exists
We can't depend on QT_HAS_INCLUDE for such an important functionality in
QtQml, so detect at configure time.

alloca() is not a POSIX function (it apparently first appeared in
Version 32V AT&T UNIX), so the actual header that defines it varies from
system to system. Clearly, if alloca.h exists, that's the one, so we try
it first. On most other systems that don't define it, it's in stdlib.h.
The only exception is Windows, where it's actually defined in malloc.h.

Task-number: QTBUG-59700
Started-by: Thiago Macieira <thiago.macieira@intel.com>
Change-Id: Icd0e0d4b27cb4e5eb892fffd14b4b2b389a4684e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
2017-05-03 12:19:57 +00:00
bin don't include injected headers into linker version script 2016-10-14 09:00:29 +00:00
config.tests alloca: detect whether alloca.h exists 2017-05-03 12:19:57 +00:00
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doc Doc: Highlight wearable demo 2017-05-03 10:22:11 +00:00
examples Update rasterwindow example to not create() in the constructor 2017-04-21 15:12:55 +00:00
lib Purge all fonts 2015-08-18 19:59:14 +00:00
mkspecs winrt: Fix manifest dependencies for VS 2017 2017-05-03 06:52:27 +00:00
qmake VS 2017: Fall back to "x86" as arch if it is not "arm" or "x64" 2017-05-03 06:52:29 +00:00
src alloca: detect whether alloca.h exists 2017-05-03 12:19:57 +00:00
tests Introducing multiscreen-menus manual test 2017-05-03 08:35:49 +00:00
util Handle indirect sibling selector 2016-07-27 20:18:02 +00:00
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configure Clean up mkspecs from old, unsupported and untested mkspecs 2017-04-27 22:34:34 +00:00
configure.bat configure: balk at any of {{,X}QMAKESPEC,QMAKE{PATH,FEATURES}} being set 2017-04-21 09:22:27 +00:00
configure.json alloca: detect whether alloca.h exists 2017-05-03 12:19:57 +00:00
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