Hello,
I'd like to write a macro, called LX_DEBUG. This checks if the user
gives "--enable-debug" and then depending on the compiler, modify CFLAGS.
However, I see that the autoconf macros already modify CFLAGS. Is there
a way that I can obtain what the user originally entered *within* my
macro after AC_PROG_CC? If the user provided CFLAGS, I wish to use that
and make no modifications. Otherwise, if GNU CC is used, I wish to set
it to "-O0 -g".
Currently, autotools sets it to "-O2 -g". I can't seem to figure out
where the original settings are given.
If the user doesn't provide --enable-debug, I don't want to change anything.
My macro currently looks like:
AC_DEFUN([LX_DEBUG],
[AC_ARG_ENABLE(debug)
AM_CONDITIONAL([HAVE_DEBUG], [test x$enable_debug = xyes])
if test x$enable_debug = xyes; then
AC_DEFINE([DEBUG], [1], [Enable Debugging])
AC_MSG_CHECKING([supported compiler debug options])
if test x$ac_cv_c_compiler_gnu = xyes; then
AC_MSG_RESULT([GCC])
AC_MSG_CHECKING([gcc cflags])
# Unfortunately here, CFLAGS is always set, even if the user
didn't set them
if test "x$CFLAGS" = "x"; then
CFLAGS="-O0 -g"
fi
AC_MSG_RESULT([$CFLAGS])
else
AC_MSG_RESULT([Unknown])
fi
fi
])
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