glibc/sysdeps/s390/configure.ac

GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/s390.

dnl It is always possible to access static and hidden symbols in an
dnl position independent way.
AC_DEFINE(PI_STATIC_AND_HIDDEN)

AC_CACHE_CHECK(for __builtin_tbegin, libc_cv_gcc_builtin_tbegin, [dnl
cat > conftest.c <<\EOF
#include <htmintrin.h>
void testtransaction ()
{
  if (__builtin_tbegin (0) == _HTM_TBEGIN_STARTED)
    {
      __builtin_tend ();
    }
}
EOF
dnl
dnl test, if the tbegin instruction is used by __builtin_tbegin
if AC_TRY_COMMAND([${CC-cc} -mhtm -O2 -S conftest.c -o - | grep -w tbegin > /dev/null]) ;
then
  libc_cv_gcc_builtin_tbegin=yes
else
  libc_cv_gcc_builtin_tbegin=no
fi
rm -f conftest* ])

if test "$libc_cv_gcc_builtin_tbegin" = no ; then
   critic_missing="$critic_missing The used GCC has no support for __builtin_tbegin, which is needed for lock-elision on target S390."
fi


AC_CACHE_CHECK(for S390 vector instruction support, libc_cv_asm_s390_vx, [dnl
cat > conftest.c <<\EOF
void testvecinsn ()
{
    __asm__ (".machine \"z13\" \n\t"
	     ".machinemode \"zarch_nohighgprs\" \n\t"
	     "vistrbs %%v16,%%v17 \n\t"
	     "locghie %%r1,0" : :);
}
EOF
dnl
dnl test, if assembler supports S390 vector instructions
if AC_TRY_COMMAND([${CC-cc} --shared conftest.c -o conftest.o &> /dev/null]) ;
then
  libc_cv_asm_s390_vx=yes
else
  libc_cv_asm_s390_vx=no
fi
rm -f conftest* ])

if test "$libc_cv_asm_s390_vx" = yes ;
then
  AC_DEFINE(HAVE_S390_VX_ASM_SUPPORT)
else
  AC_MSG_WARN([Use binutils with vector-support in order to use optimized implementations.])
fi

AC_CACHE_CHECK(for S390 vector support in gcc, libc_cv_gcc_s390_vx, [dnl
cat > conftest.c <<\EOF
void testvecclobber ()
{
  __asm__ ("" : : : "v16");
}
EOF
dnl
dnl test, if gcc supports S390 vector registers as clobber in inline assembly
if AC_TRY_COMMAND([${CC-cc} --shared conftest.c -o conftest.o &> /dev/null]) ;
then
  libc_cv_gcc_s390_vx=yes
else
  libc_cv_gcc_s390_vx=no
fi
rm -f conftest* ])

if test "$libc_cv_gcc_s390_vx" = yes ;
then
  AC_DEFINE(HAVE_S390_VX_GCC_SUPPORT)
fi

AC_CACHE_CHECK(for S390 z196 zarch instruction support as default,
	       libc_cv_asm_s390_min_z196_zarch, [dnl
cat > conftest.c <<\EOF
float testinsn (double e)
{
    float d;
    __asm__ ("ledbra %0,5,%1,4" : "=f" (d) : "f" (e) );
    return d;
}
EOF
dnl
dnl test, if assembler supports S390 z196 zarch instructions as default
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS --shared conftest.c
			-o conftest.o &> /dev/null]) ;
then
  libc_cv_asm_s390_min_z196_zarch=yes
else
  libc_cv_asm_s390_min_z196_zarch=no
fi
rm -f conftest* ])

if test "$libc_cv_asm_s390_min_z196_zarch" = yes ;
then
  AC_DEFINE(HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT)
fi

test -n "$critic_missing" && AC_MSG_ERROR([
*** $critic_missing])