AC_EGREP_CPP expands to invalid shell code

[Bruno Haible]

Hi,

Using autoconf-2.57. This small configure.ac file expands to shell code
that causes a syntax error:

=========================== configure.ac ============================
AC_INIT(dummy,0)

AC_PROG_CC

AC_CACHE_CHECK([whether <inttypes.h> defines strtoimax as a macro],
  jm_cv_func_strtoimax_macro,
  AC_EGREP_CPP([inttypes_h_defines_strtoimax], [#include <inttypes.h>
#ifdef strtoimax
 inttypes_h_defines_strtoimax
#endif],
    jm_cv_func_strtoimax_macro=yes,
    jm_cv_func_strtoimax_macro=no))

AC_OUTPUT
======================================================================
$ autoconf-2.57 -Wall
$ ./configure
checking for gcc... gcc
checking for C compiler default output... 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... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking whether <inttypes.h> defines strtoimax as a macro... ./configure: line 
2099: CPP: command not found
checking how to run the C preprocessor... gcc -E
checking for egrep... grep -E
no
configure: creating ./config.status

Line 2099 of the generated configure file contains:

  CPP         C preprocessor

which is obviously not a shell command.

It has something to do with AC_PROG_CPP; if I add AC_PROG_CPP after AC_PROG_CC
the error disappears. If I furthermore add AC_PROG_EGREP after it, the
configure output becomes reasonable again. Maybe all that's missing is that
AC_EGREP_CPP AC_REQUIREs AC_PROG_CPP and AC_PROG_EGREP.


Bruno