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Enable -fstack-protector-strong by default on x86

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The size overhead seems to be about 1% and the speed overhead is
"in the noise" (<2%).
The automake code is copied from opus-tools
This commit is contained in:
Jean-Marc Valin 2018-02-22 14:51:52 -05:00
parent e3e1f89029
commit 76d966f436
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1 changed files with 31 additions and 0 deletions
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31
configure.ac
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@ -822,6 +822,37 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[char foo;]])],
CFLAGS="$saved_CFLAGS"
])
on_x86=no
case "$host_cpu" in
i[[3456]]86 | x86_64)
on_x86=yes
;;
esac
dnl Enable stack-protector-all only on x86 where it's well supported.
dnl on some platforms it causes crashes. Hopefully the OS's default's
dnl include this on platforms that work but have been missed here.
AC_ARG_ENABLE([stack-protector],
[AS_HELP_STRING([--disable-stack-protector],[Disable compiler stack hardening])],,
[
AS_IF([test "$ac_cv_c_compiler_gnu" = "yes" && test "$on_x86" = "yes"],
[enable_stack_protector=yes],[enable_stack_protector=no])
])
AS_IF([test "$enable_stack_protector" = "yes"],
[
saved_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fstack-protector-strong"
AC_MSG_CHECKING([if ${CC} supports -fstack-protector-strong])
AC_LINK_IFELSE([AC_LANG_PROGRAM([],[[char foo;]])],
[ AC_MSG_RESULT([yes]) ],
[
AC_MSG_RESULT([no])
enable_stack_protector=no
CFLAGS="$saved_CFLAGS"
])
])
CFLAGS="$CFLAGS -W"
warn_CFLAGS="-Wall -Wextra -Wcast-align -Wnested-externs -Wshadow -Wstrict-prototypes"