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build: remove ssp-buffer-size

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This option only makes sense for -fstack-protector.
With -fstack-protector-all or -fstack-protector-strong,
functions are protected regardless of buffer size.

https://bugzilla.redhat.com/show_bug.cgi?id=1105456
This commit is contained in:
Ján Tomko 2014-06-11 10:44:26 +02:00
parent fa3519cbe5
commit 5567baa973
1 changed files with 4 additions and 9 deletions
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13
m4/virt-compile-warnings.m4
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@ -166,16 +166,11 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
*-*-linux*)
dnl Fedora only uses -fstack-protector, but doesn't seem to
dnl be great overhead in adding -fstack-protector-all instead
dnl wantwarn="$wantwarn -fstack-protector"
dnl
dnl We also don't need ssp-buffer-size with -all,
dnl since functions are protected regardless of buffer size.
dnl wantwarn="$wantwarn --param=ssp-buffer-size=4"
wantwarn="$wantwarn -fstack-protector-all"
wantwarn="$wantwarn --param=ssp-buffer-size=4"
dnl Even though it supports it, clang complains about
dnl use of --param=ssp-buffer-size=4 unless used with
dnl the -c arg. It doesn't like it when used with args
dnl that just link together .o files. Unfortunately
dnl we can't avoid that with automake, so we must turn
dnl off the following clang specific warning
wantwarn="$wantwarn -Wno-unused-command-line-argument"
;;
*-*-freebsd*)
dnl FreeBSD ships old gcc 4.2.1 which doesn't handle