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Port to Ubuntu 16.10, which needs gcc -nopie

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* configure.ac (emacs_cv_prog_cc_no_pie): Rename from
emacs_cv_prog_cc_nopie.  All usages changed.  Check for -no-pie in
preference to -nopie (Bug#24682).  Backport from master.
This commit is contained in:
Paul Eggert 2016-10-16 16:25:47 -07:00
parent b73f4668ab
commit 99892eeec8
1 changed files with 18 additions and 14 deletions
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32
configure.ac
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@ -5159,25 +5159,29 @@ case "$opsys" in
*) LD_SWITCH_SYSTEM_TEMACS= ;;
esac
# -nopie fixes a temacs segfault on Gentoo, OpenBSD, and other systems
# with "hardened" GCC configurations for some reason (Bug#18784).
# We don't know why -nopie works, but not segfaulting is better than
# segfaulting. Use ac_c_werror_flag=yes when trying -nopie, otherwise
# clang keeps warning that it does not understand -nopie, and pre-4.6
# GCC has a similar problem (Bug#20338).
AC_CACHE_CHECK([whether $CC accepts -nopie],
[emacs_cv_prog_cc_nopie],
# -no-pie or -nopie fixes a temacs segfault on Gentoo, OpenBSD,
# Ubuntu, and other systems with "hardened" GCC configurations for
# some reason (Bug#18784). We don't know why this works, but not
# segfaulting is better than segfaulting. Use ac_c_werror_flag=yes
# when trying the option, otherwise clang keeps warning that it does
# not understand it, and pre-4.6 GCC has a similar problem
# (Bug#20338). Prefer -no-pie to -nopie, as -no-pie is the
# spelling used by GCC 6.1.0 and later (Bug#24682).
AC_CACHE_CHECK(
[for $CC option to disable position independent executables],
[emacs_cv_prog_cc_no_pie],
[emacs_save_c_werror_flag=$ac_c_werror_flag
emacs_save_LDFLAGS=$LDFLAGS
ac_c_werror_flag=yes
LDFLAGS="$LDFLAGS -nopie"
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
[emacs_cv_prog_cc_nopie=yes],
[emacs_cv_prog_cc_nopie=no])
for emacs_cv_prog_cc_no_pie in -no-pie -nopie no; do
test $emacs_cv_prog_cc_no_pie = no && break
LDFLAGS="$emacs_save_LDFLAGS $emacs_cv_prog_cc_no_pie"
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [break])
done
ac_c_werror_flag=$emacs_save_c_werror_flag
LDFLAGS=$emacs_save_LDFLAGS])
if test "$emacs_cv_prog_cc_nopie" = yes; then
LD_SWITCH_SYSTEM_TEMACS="$LD_SWITCH_SYSTEM_TEMACS -nopie"
if test "$emacs_cv_prog_cc_no_pie" != no; then
LD_SWITCH_SYSTEM_TEMACS="$LD_SWITCH_SYSTEM_TEMACS $emacs_cv_prog_cc_no_pie"
fi
if test x$ac_enable_profiling != x ; then