configure

glibc 库, 不仅可以学习使用库函数,还可以学习函数的具体实现,是提高功力的好资料

# This file is generated from configure.in by Autoconf.  DO NOT EDIT!
 # Local configure fragment for sysdeps/powerpc/powerpc64.

# The Aix ld uses global .symbol_names instead of symbol_names
# and unfortunately early Linux PPC64 linkers use it as well.
echo "$as_me:$LINENO: checking for support for omitting dot symbols" >&5
echo $ECHO_N "checking for support for omitting dot symbols... $ECHO_C" >&6
if test "${libc_cv_omit_dot_syms+set}" = set; then
  echo $ECHO_N "(cached) $ECHO_C" >&6
else
  libc_cv_omit_dot_syms=no
echo 'void foo (void) {}' > conftest.c
if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s 1>&5'
  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
  (eval $ac_try) 2>&5
  ac_status=$?
  echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); }; }; then
  if grep -w '\.foo' conftest.s > /dev/null; then
    :
  else
    libc_cv_omit_dot_syms=yes
  fi
fi
rm -f conftest.c conftest.s

fi
echo "$as_me:$LINENO: result: $libc_cv_omit_dot_syms" >&5
echo "${ECHO_T}$libc_cv_omit_dot_syms" >&6
if test x$libc_cv_omit_dot_syms != xyes; then
  cat >>confdefs.h <<\_ACEOF
#define HAVE_ASM_GLOBAL_DOT_NAME 1
_ACEOF

fi

echo "$as_me:$LINENO: checking for linker support for overlapping .opd entries" >&5
echo $ECHO_N "checking for linker support for overlapping .opd entries... $ECHO_C" >&6
if test "${libc_cv_overlapping_opd+set}" = set; then
  echo $ECHO_N "(cached) $ECHO_C" >&6
else
  libc_cv_overlapping_opd=no
echo 'void foo (void) {}' > conftest.c
if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s 1>&5'
  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
  (eval $ac_try) 2>&5
  ac_status=$?
  echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); }; }; then
  if grep '\.TOC\.@tocbase' conftest.s > /dev/null; then
    if grep '\.TOC\.@tocbase[ 	]*,[ 	]*0' conftest.s > /dev/null; then
      :
    else
      libc_cv_overlapping_opd=yes
    fi
  fi
fi
rm -f conftest.c conftest.s

fi
echo "$as_me:$LINENO: result: $libc_cv_overlapping_opd" >&5
echo "${ECHO_T}$libc_cv_overlapping_opd" >&6
if test x$libc_cv_overlapping_opd = xyes; then
  cat >>confdefs.h <<\_ACEOF
#define USE_PPC64_OVERLAPPING_OPD 1
_ACEOF

fi