[PATCH] configure check for crypt()

[Andreas Voegele]

Guile's configure script checks for the crypt library with
AC_CHECK_LIB(crypt, crypt).  On HP-UX 11, crypt() is included in the C
library.  libcrypt.a is an empty dummy library provided for
compatibility with old software.  The check for crypt() succeeds since
the test program is linked against the empty crypt library as well as
the C library.  As a consequence -lcrypt is added to the list of
required libraries.  The problem is that libtool does not create a
shared libguile since there is only a static crypt library.

I think that configure should first check whether the C library
provides crypt() before it checks for the crypt library.

Here's a patch that replaces AC_CHECK_LIB with AC_SEARCH_LIBS and
HAVE_LIBCRYPT with HAVE_CRYPT.  I've tested this patch under HP-UX and
GNU/Linux.

Index: configure.in
===================================================================
RCS file: /cvsroot/guile/guile/guile-core/configure.in,v
retrieving revision 1.230
diff -u -u -r1.230 configure.in
--- configure.in        25 Jan 2004 13:02:21 -0000      1.230
+++ configure.in        15 Feb 2004 19:40:03 -0000
@@ -588,7 +588,7 @@
 
 AC_CHECK_HEADERS(crypt.h sys/resource.h sys/file.h)
 AC_CHECK_FUNCS(chroot flock getlogin cuserid getpriority setpriority getpass 
sethostname gethostname)
-AC_CHECK_LIB(crypt, crypt)
+AC_SEARCH_LIBS(crypt, crypt, AC_DEFINE(HAVE_CRYPT, 1, [Define if you have the 
crypt function.]))
 
 dnl GMP tests
 AC_CHECK_LIB([gmp], [__gmpz_init], ,
Index: libguile/posix.c
===================================================================
RCS file: /cvsroot/guile/guile/guile-core/libguile/posix.c,v
retrieving revision 1.120
diff -u -u -r1.120 posix.c
--- libguile/posix.c    15 Sep 2003 12:36:57 -0000      1.120
+++ libguile/posix.c    15 Feb 2004 19:40:04 -0000
@@ -110,7 +110,7 @@
 #include <locale.h>
 #endif
 
-#if HAVE_LIBCRYPT && HAVE_CRYPT_H
+#if HAVE_CRYPT && HAVE_CRYPT_H
 #  include <crypt.h>
 #endif
 
@@ -1400,7 +1400,7 @@
 #undef FUNC_NAME
 #endif /* HAVE_SYNC */
 
-#if HAVE_LIBCRYPT && HAVE_CRYPT_H
+#if HAVE_CRYPT && HAVE_CRYPT_H
 SCM_DEFINE (scm_crypt, "crypt", 2, 0, 0, 
             (SCM key, SCM salt),
            "Encrypt @var{key} using @var{salt} as the salt value to the\n"
@@ -1416,7 +1416,7 @@
   return scm_makfrom0str (p);
 }
 #undef FUNC_NAME
-#endif /* HAVE_LIBCRYPT && HAVE_CRYPT_H */
+#endif /* HAVE_CRYPT && HAVE_CRYPT_H */
 
 #if HAVE_CHROOT
 SCM_DEFINE (scm_chroot, "chroot", 1, 0, 0,