sysdeps/x86_64/configure.ac

   1 GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
   2 # Local configure fragment for sysdeps/x86_64.
   3
   4 dnl Check if -mprefer-vector-width=128 works.
   5 AC_CACHE_CHECK(-mprefer-vector-width=128, libc_cv_cc_mprefer_vector_width, [dnl
   6 LIBC_TRY_CC_OPTION([-mprefer-vector-width=128],
   7                    [libc_cv_cc_mprefer_vector_width=yes],
   8                    [libc_cv_cc_mprefer_vector_width=no])
   9 ])
  10 LIBC_CONFIG_VAR([config-cflags-mprefer-vector-width],
  11                 [$libc_cv_cc_mprefer_vector_width])
  12
  13 LIBC_LINKER_FEATURE([-z mark-plt], [-Wl,-z,mark-plt],
  14                     [libc_cv_z_mark_plt=yes], [libc_cv_z_mark_plt=no])
  15 LIBC_CONFIG_VAR([have-z-mark-plt], [$libc_cv_z_mark_plt])
  16
  17 if test x"$build_mathvec" = xnotset; then
  18   build_mathvec=yes
  19 fi
  20
  21 if test $enable_cet != no; then
  22   # Check if CET can be enabled.
  23   AC_CACHE_CHECK(whether CET can be enabled,
  24                  libc_cv_x86_cet_available, [dnl
  25 cat > conftest.c <<EOF
  26 #if !defined __CET__ || __CET__ != 3
  27 # error CET isn't available.
  28 #endif
  29 EOF
  30                  if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS -fcf-protection -include cet.h conftest.c 1>&AS_MESSAGE_LOG_FD); then
  31                    libc_cv_x86_cet_available=yes
  32                  else
  33                    libc_cv_x86_cet_available=no
  34                  fi
  35                  rm -rf conftest*])
  36   if test $libc_cv_x86_cet_available != yes; then
  37     AC_MSG_ERROR([$CC doesn't support CET])
  38   fi
  39 fi
  40 if test $enable_cet != no; then
  41   # Check if assembler supports CET.
  42   AC_CACHE_CHECK(whether assembler supports CET,
  43                  libc_cv_x86_cet_as, [dnl
  44 cat > conftest.s <<EOF
  45         incsspd %ecx
  46 EOF
  47                  if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s -o conftest.o 1>&AS_MESSAGE_LOG_FD); then
  48                    libc_cv_x86_cet_as=yes
  49                  else
  50                    libc_cv_x86_cet_as=no
  51                  fi
  52                  rm -rf conftest*])
  53   if test $libc_cv_x86_cet_as = no; then
  54     AC_MSG_ERROR([$AS doesn't support CET])
  55   fi
  56 fi
  57 if test $enable_cet = yes; then
  58   AC_DEFINE(DEFAULT_DL_X86_CET_CONTROL, cet_elf_property)
  59 elif test $enable_cet = permissive; then
  60   AC_DEFINE(DEFAULT_DL_X86_CET_CONTROL, cet_permissive)
  61 fi
  62 LIBC_CONFIG_VAR([enable-cet], [$enable_cet])
  63
  64 test -n "$critic_missing" && AC_MSG_ERROR([
  65 *** $critic_missing])