autoconf 2.63b: wrong macro expansion order

[Andreas Schwab]

With the following input autoconf 2.63b expands macros out of order:

$ cat configure.ac
AC_INIT(configure.ac)
AC_DEFUN([FOO], [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])])])
AC_DEFUN([BAR], [AC_PROG_CC
FOO])
BAR
AC_OUTPUT
$ autoconf
configure.ac:5: warning: AC_REQUIRE: `AC_PROG_CC' was expanded before it was 
required
../../lib/autoconf/c.m4:422: AC_LANG_COMPILER(C) is expanded from...
../../lib/autoconf/lang.m4:305: AC_LANG_COMPILER_REQUIRE is expanded from...
../../lib/autoconf/general.m4:2564: AC_COMPILE_IFELSE is expanded from...
configure.ac:2: FOO is expanded from...
configure.ac:3: BAR is expanded from...
configure.ac:5: the top level
$ ./configure 
checking for gcc... gcc
checking whether we are using the GNU C compiler... no
checking whether gcc accepts -g... no
checking for gcc option to accept ISO C89... unsupported
checking for gcc... (cached) gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are using the GNU C compiler... (cached) no
checking whether gcc accepts -g... (cached) no
checking for gcc option to accept ISO C89... (cached) unsupported
configure: creating ./config.status

This is a regression from 2.63.  When I remove the m4_expand_once calls
from AC_PROG_CC then I get at least correct output, albeit duplicated.

Andreas.

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Andreas Schwab, address@hidden
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