m4/relaytool.m4

   1 dnl  Usage: RELAYTOOL(LIBRARY_NAME, LIBS, CFLAGS, ACTION-IF-WEAK-LINK-IS-POSSIBLE)
   2
   3 dnl  Example:
   4 dnl  RELAYTOOL("gtkspell", GTKSPELL_LIBS, GTKSPELL_CFLAGS, gtkspell_weak=yes)
   5 dnl  Will modify GTKSPELL_LIBS to include a call to relaytool if available
   6 dnl  or if not, will modify GTKSPELL_CFLAGS to include -D switches to define
   7 dnl  libgtkspell_is_present=1 and libgtkspell_symbol_is_present=1
   8
   9 AC_DEFUN([RELAYTOOL], [
  10     if test -z "$RELAYTOOL_PROG"; then
  11         AC_PATH_PROG(RELAYTOOL_PROG, relaytool, no)
  12     fi
  13
  14     AC_MSG_CHECKING(whether we can weak link $1)
  15
  16     _RELAYTOOL_PROCESSED_NAME=`echo "$1" | sed 's/-/_/g;s/\./_/g;'`
  17     _RELAYTOOL_UPPER_NAME=`echo $_RELAYTOOL_PROCESSED_NAME | tr '[[:lower:]]' '[[:upper:]]'`
  18
  19     if test "$RELAYTOOL_PROG" = "no"; then
  20         AC_MSG_RESULT(no)
  21         $3="-DRELAYTOOL_${_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; }' $$3"
  22     else
  23         AC_MSG_RESULT(yes)
  24         $2=`echo $$2|sed 's/\`/\\\\\`/g;'`
  25         $2="-Wl,--gc-sections \`relaytool --relay $1 $$2\`"
  26         $3="-DRELAYTOOL_${_RELAYTOOL_UPPER_NAME}='extern int lib${_RELAYTOOL_PROCESSED_NAME}_is_present; extern int lib${_RELAYTOOL_PROCESSED_NAME}_symbol_is_present(char *s);' $$3"
  27         $4
  28     fi
  29 ])
  30