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Port 'configure' to clang 3.5

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* configure.ac: Add -Wno-unknown-attributes if clang; otherwise
clang 3.5.0 (Fedora 21 x86-64) complains
"/usr/include/glib-2.0/glib/gmem.h: ... warning: unknown attribute
'__alloc_size__' ignored".  Use -Werror when checking for -nopie;
otherwise clang warns about -nopie instead of failing, and then
later it warns everytime the build uses -nopie.
This commit is contained in:
Paul Eggert 2015-04-03 13:05:23 -07:00
parent 8596eb1282
commit 95ef69e746
2 changed files with 25 additions and 8 deletions
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10
ChangeLog
View file

@ -1,3 +1,13 @@
2015-04-03 Paul Eggert <eggert@cs.ucla.edu>
Port 'configure' to clang 3.5
* configure.ac: Add -Wno-unknown-attributes if clang; otherwise
clang 3.5.0 (Fedora 21 x86-64) complains
"/usr/include/glib-2.0/glib/gmem.h: ... warning: unknown attribute
'__alloc_size__' ignored". Use -Werror when checking for -nopie;
otherwise clang warns about -nopie instead of failing, and then
later it warns everytime the build uses -nopie.
2015-04-03 Ulrich Müller <ulm@gentoo.org>
* configure.ac (LD_SWITCH_SYSTEM_TEMACS): Add -nopie option if it

23
configure.ac
View file

@ -883,6 +883,7 @@ if test "$gl_gcc_warnings" != yes; then
gl_WARN_ADD([-Wno-tautological-constant-out-of-range-compare])
gl_WARN_ADD([-Wno-pointer-sign])
gl_WARN_ADD([-Wno-string-plus-int])
gl_WARN_ADD([-Wno-unknown-attributes])
fi
else
isystem='-isystem '
@ -5030,16 +5031,22 @@ case "$opsys" in
*) LD_SWITCH_SYSTEM_TEMACS= ;;
esac
AC_CACHE_CHECK([whether the linker accepts -nopie],
# -nopie fixes a temacs segfault on Gentoo 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.
AC_CACHE_CHECK([whether $CC accepts -nopie],
[emacs_cv_prog_cc_nopie],
[emacs_save_LDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -nopie"
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
[emacs_cv_prog_cc_nopie=yes],
[emacs_cv_prog_cc_nopie=no])
LDFLAGS=$emacs_save_LDFLAGS])
[emacs_save_CFLAGS=$CFLAGS
emacs_save_LDFLAGS=$LDFLAGS
CFLAGS="$CFLAGS -Werror"
LDFLAGS="$LDFLAGS -nopie"
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
[emacs_cv_prog_cc_nopie=yes],
[emacs_cv_prog_cc_nopie=no])
CFLAGS=$emacs_save_CFLAGS
LDFLAGS=$emacs_save_LDFLAGS])
if test "$emacs_cv_prog_cc_nopie" = yes; then
# Disable PIE to avoid segfaults in temacs (bug#18784)
LD_SWITCH_SYSTEM_TEMACS="$LD_SWITCH_SYSTEM_TEMACS -nopie"
fi