acinclude.m4   [plain text]

#  AC_PROG_CXX

# FIXME: We temporarily define our own version of AC_PROG_CXX.
# This is copied from autoconf 2.13, but does not call AC_PROG_CXX_WORKS.
# We do not need a C++ compiler in order to build dejagnu, so
# if we cannot find a working compiler it is not the end of
# the world.  This is fixed in later versions of autoconf where
# there is different macro which will skip the link test entirely.

AC_DEFUN(AC_PROG_CXX,
[AC_BEFORE([$0], [AC_PROG_CXXCPP])dnl
AC_CHECK_PROGS(CXX, $CCC c++ g++ gcc CC cxx cc++ cl, gcc)

AC_PROG_CXX_GNU

if test $ac_cv_prog_gxx = yes; then
  GXX=yes
else
  GXX=
fi

dnl Check whether -g works, even if CXXFLAGS is set, in case the package
dnl plays around with CXXFLAGS (such as to build both debugging and
dnl normal versions of a library), tasteless as that idea is.
ac_test_CXXFLAGS="${CXXFLAGS+set}"
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS=
AC_PROG_CXX_G
if test "$ac_test_CXXFLAGS" = set; then
  CXXFLAGS="$ac_save_CXXFLAGS"
elif test $ac_cv_prog_cxx_g = yes; then
  if test "$GXX" = yes; then
    CXXFLAGS="-g -O2"
  else
    CXXFLAGS="-g"
  fi
else
  if test "$GXX" = yes; then
    CXXFLAGS="-O2"
  else
    CXXFLAGS=
  fi
fi
])