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dnl Usage: RELAYTOOL(LIBRARY_NAME, LIBS, CFLAGS, ACTION-IF-WEAK-LINK-IS-POSSIBLE)
dnl Example:
dnl RELAYTOOL("gtkspell", GTKSPELL_LIBS, GTKSPELL_CFLAGS, gtkspell_weak=yes)
dnl Will modify GTKSPELL_LIBS to include a call to relaytool if available
dnl or if not, will modify GTKSPELL_CFLAGS to include -D switches to define
dnl libgtkspell_is_present=1 and libgtkspell_symbol_is_present=1
AC_DEFUN([RELAYTOOL], [
if test -z "$RELAYTOOL_PROG"; then
AC_PATH_PROG(RELAYTOOL_PROG, relaytool, no)
fi
AC_MSG_CHECKING(whether we can weak link $1)
_RELAYTOOL_PROCESSED_NAME=`echo "$1" | sed 's/-/_/g;s/\./_/g;'`
_RELAYTOOL_UPPER_NAME=`echo $_RELAYTOOL_PROCESSED_NAME | tr '[[:lower:]]' '[[:upper:]]'`
if test "$RELAYTOOL_PROG" = "no"; then
AC_MSG_RESULT(no)
$3="-DRELAYTOOL_${_RELAYTOOL_UPPER_NAME}='static const int lib${_RELAYTOOL_PROCESSED_NAME}_is_present = 1; static int __attribute__((unused)) lib${_RELAYTOOL_PROCESSED_NAME}_symbol_is_present(char *m) { return 1; }' $$3"
else
AC_MSG_RESULT(yes)
$2=`echo $$2|sed 's/\`/\\\\\`/g;'`
$2="-Wl,--gc-sections \`relaytool --relay $1 $$2\`"
$3="-DRELAYTOOL_${_RELAYTOOL_UPPER_NAME}='extern int lib${_RELAYTOOL_PROCESSED_NAME}_is_present; extern int lib${_RELAYTOOL_PROCESSED_NAME}_symbol_is_present(char *s);' $$3"
$4
fi
])
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