cln_mirror/m4/cc.m4

dnl The CLN manual says that without CFLAGS or CXXFLAGS being set compilation
dnl will happen with -O.  However, AC_PROG_CC and AC_PROG_CXX set CFLAGS and
dnl CXXFLAGS to "-g -O2", which produces way too large binaries.


dnl Wrapper around AC_PROG_CC setting CFLAGS to plain "-O" as opposed to
dnl "-g -O2" for the GNU compiler (unless CFLAGS was set before).
AC_DEFUN([CL_PROG_CC],
[cl_test_CFLAGS=${CFLAGS+set}
# Make sure this macro does not come after AC_PROG_CC.
# Otherwise CFLAGS would already be set.
AC_BEFORE([$0],[AC_PROG_CC])dnl
AC_PROG_CC([$1])
if test "$cl_test_CFLAGS" != set && test "$ac_compiler_gnu" = yes; then
    CFLAGS="-O"
fi
])


dnl Wrapper around AC_PROG_CXX setting CXXFLAGS to plain "-O" as opposed to
dnl "-g -O2" for the GNU compiler (unless CXXFLAGS was set before).  Also
dnl emits a warning if G++ is used and optimization turned off.
AC_DEFUN([CL_PROG_CXX],
[cl_test_CXXFLAGS=${CXXFLAGS+set}
# Make sure this macro does not come after AC_PROG_CXX.
# Otherwise CXXFLAGS would already be set.
AC_BEFORE([$0],[AC_PROG_CXX])dnl
AC_PROG_CXX([$1])
if test "$ac_compiler_gnu" = yes; then
  if test "$cl_test_CXXFLAGS" != set; then
    # User has not set CXXFLAGS.
    CXXFLAGS="-O"
  else
    # Warn if optimization has been turned off with GCC.
    # Optimization is used for module ordering.
    case $CXXFLAGS in
      [ *\ -O | -O | -O\ * | *\ -O\ * | -O[!0]* | *\ -O[!0]*) ;; ]
      *) AC_MSG_WARN([Optimization turned off. I recommend you unset CXXFLAGS.]);;
    esac
  fi
fi
])