dnl _ON results in a '--without' option in the --help output, so
dnl the help text should refer to "don't compile", etc.
+with_xpm_set=${with_xpm+set}
OPTION_DEFAULT_ON([xpm],[don't compile with XPM image support])
OPTION_DEFAULT_ON([jpeg],[don't compile with JPEG image support])
OPTION_DEFAULT_ON([tiff],[don't compile with TIFF image support])
AC_ARG_ENABLE(link-time-optimization,
[AS_HELP_STRING([--enable-link-time-optimization],
[build emacs with link-time optimization.
- This is supported only for GCC since 4.5.0.])],
+ This requires GCC 4.5.0 or later.
+ It also makes Emacs harder to debug, and when we tried it
+ with GCC 4.9.0 x86-64 it made Emacs slower, so it's not
+ recommended for typical use.])],
if test "${enableval}" != "no"; then
AC_MSG_CHECKING([whether link-time optimization is supported])
ac_lto_supported=no
AC_MSG_RESULT([$ac_lto_supported])
if test "$ac_lto_supported" = "yes"; then
CFLAGS="$CFLAGS $LTO"
+ dnl The following is needed for GCC 4.9.0. The GCC 4.9.0 release notes
+ dnl suggest that instead of -ffat-lto-objects we should use gcc-ar and
+ dnl gcc-ranlib in place of ar and ranlib, but gcc-ar makes /usr/bin/ar
+ dnl dump core on Fedora 20, so play it safe for now.
+ gl_COMPILER_OPTION_IF([-ffat-lto-objects],
+ [CFLAGS="$CFLAGS -ffat-lto-objects"])
fi
fi)
LIBS="$LIB_PTHREAD $LIBS" ;;
esac
AC_DEFINE(HAVE_PTHREAD, 1, [Define to 1 if you have pthread (-lpthread).])
+
+ # Some systems optimize for single-threaded programs by default, and
+ # need special flags to disable these optimizations. For example, the
+ # definition of 'errno' in <errno.h>.
+ case $opsys in
+ sol*)
+ AC_DEFINE([_REENTRANT], 1,
+ [Define to 1 if your system requires this in multithreaded code.]);;
+ aix4-2)
+ AC_DEFINE([_THREAD_SAFE], 1,
+ [Define to 1 if your system requires this in multithreaded code.]);;
+ esac
fi
AC_SUBST([LIB_PTHREAD])
fi
if test "${HAVE_X11}" = "yes"; then
+ dnl Avoid Xpm on AIX unless requested, as it crashes; see Bug#17598.
+ test "$opsys$with_xpm_set" = aix4-2 && with_xpm=no
+
if test "${with_xpm}" != "no"; then
AC_CHECK_HEADER(X11/xpm.h,
[AC_CHECK_LIB(Xpm, XpmReadFileToPixmap, HAVE_XPM=yes, , -lX11)])
if test "${HAVE_XPM}" = "yes"; then
AC_DEFINE(HAVE_XPM, 1, [Define to 1 if you have the Xpm library (-lXpm).])
LIBXPM=-lXpm
+ elif test "$opsys,$LUCID_LIBW" = aix4-2,-lXaw; then
+ dnl AIX -lXaw needs -lXpm linked too; see Bug#17598 Message#152.
+ LIBXPM=-lXpm
fi
fi
else
case $opsys in
dnl irix: Tested on Irix 6.5. SCM worked on earlier versions.
- dragonfly | freebsd | netbsd | openbsd | irix6-5 | sol2* )
+ aix* | dragonfly | freebsd | netbsd | openbsd | irix6-5 | sol2* )
AC_DEFINE(GC_SETJMP_WORKS, 1)
;;
esac