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| author | Paul Eggert <eggert@cs.ucla.edu> | 2016-10-16 16:25:47 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2016-10-16 23:16:32 -0700 |
| commit | 99892eeec8990884ef38601f14038ec6dc227741 (patch) | |
| tree | 9ccfc7ebaddd75101ef3a1d417ceb38a223f907c /configure.ac | |
| parent | b73f4668ab685dfb690eced15b20ed47f90efccb (diff) | |
| download | emacs-99892eeec8990884ef38601f14038ec6dc227741.tar.gz | |
Port to Ubuntu 16.10, which needs gcc -nopie
* 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.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 32 |
1 files changed, 18 insertions, 14 deletions
diff --git a/configure.ac b/configure.ac index 7a697ec3d06..7c115a036db 100644 --- a/configure.ac +++ b/configure.ac @@ -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 |