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expat: fix build on and for kernel older than 3.17

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The expat build system now fails when the getrandom() system call is not
supported. This affect both host and target builds. Define XML_POOR_ENTROPY
for target kernels older than 3.17 to fix the build. For the host package
define XML_POOR_ENTROPY unconditionally since we have no easy way to know the
host kernel version. Note that expat will still use getrandom() on the host
when it is available, we don't make security any worse.

Fixes (host):
http://autobuild.buildroot.net/results/928/928dc2b56d931da84055fdfe78929d1f956de53b/
http://autobuild.buildroot.net/results/ee9/ee90d0a456cbce4c7f22e5f61006612bd9ba30d5/
http://autobuild.buildroot.net/results/dac/dac7231242123ae3dcaa6bbdd65b44fe8d8cb20c/

Fixes (target):
http://autobuild.buildroot.net/results/308/308e830219fdfebb5aa6aef51c1dc784254998f6/
http://autobuild.buildroot.net/results/73f/73fa946b0a2205e946ad414079f88e4bdb416f00/
http://autobuild.buildroot.net/results/9d7/9d7bad22ace7fa211b31d752a2255e07cede68be/

[Peter: also use HOST_CPPFLAGS]
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

(cherry picked from commit 5242701f3a)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Baruch Siach 2017-07-17 07:11:38 +03:00 committed by Peter Korsgaard
parent 98ffe962a4
commit 6114c0b25f
1 changed files with 9 additions and 0 deletions
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9
package/expat/expat.mk
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@ -15,5 +15,14 @@ HOST_EXPAT_DEPENDENCIES = host-pkgconf
EXPAT_LICENSE = MIT
EXPAT_LICENSE_FILES = COPYING
# Kernel versions older than 3.17 do not support getrandom()
ifeq ($(BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17),)
EXPAT_CONF_ENV += CPPFLAGS="$(TARGET_CPPFLAGS) -DXML_POOR_ENTROPY"
endif
# Make build succeed on host kernel older than 3.17. getrandom() will still
# be used on newer kernels.
HOST_EXPAT_CONF_ENV += CPPFLAGS="$(HOST_CPPFLAGS) -DXML_POOR_ENTROPY"
$(eval $(autotools-package))
$(eval $(host-autotools-package))