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Pre-4.6 GCC succeeds with unknown option

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* configure.ac (emacs_cv_prog_cc_nopie): Port to pre-4.6 GCC.
Fixes: bug#20338
This commit is contained in:
Paul Eggert 2015-04-16 00:14:11 -07:00
parent 3074a9fad1
commit c6e93df202
1 changed files with 6 additions and 5 deletions
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11
configure.ac
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@ -5021,18 +5021,19 @@ 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 -Werror when trying -nopie, otherwise clang keeps
# warning that it does not understand -nopie.
# 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 $CC accepts -nopie],
[emacs_cv_prog_cc_nopie],
[emacs_save_CFLAGS=$CFLAGS
[emacs_save_c_werror_flag=$ac_c_werror_flag
emacs_save_LDFLAGS=$LDFLAGS
CFLAGS="$CFLAGS -Werror"
ac_c_werror_flag=yes
LDFLAGS="$LDFLAGS -nopie"
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
[emacs_cv_prog_cc_nopie=yes],
[emacs_cv_prog_cc_nopie=no])
CFLAGS=$emacs_save_CFLAGS
ac_c_werror_flag=$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"