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

])