#line problem

[Werner LEMBERG]

Consider the following:

  AC_DEFUN(GROFF_SRAND, [ 
    AC_LANG_PUSH(C++)
    AC_MSG_CHECKING([for return type of srand])
    AC_COMPILE_IFELSE([ 
      AC_LANG_PROGRAM([[

  #include <stdlib.h>
  extern "C" { void srand(unsigned int); }

      ]])
    ], [
      AC_MSG_RESULT(void)
      AC_DEFINE(RET_TYPE_SRAND_IS_VOID, 1,
                [Define if srand() returns void not int.])
    ], [
      AC_MSG_RESULT(int)
    ])
    AC_LANG_POP(C++)
  ])

Look how `AC_LANG_PROGRAM' is indented by four spaces.  After macro
expansion, you get

      #line $LINENO "configure"
  /* confdefs.h.  */
  ...

which is incorrect, of course.  I think the start of
AC_LANG_SOURCE(C) in c.m4 shouldn't be

  m4_define([AC_LANG_SOURCE(C)],
  [#line $LINENO "configure"
  /* confdefs.h.  */

but

  m4_define([AC_LANG_SOURCE(C)],[
  #line $LINENO "configure"
  /* confdefs.h.  */

to protect against indentation.


    Werner