* numbers.c (SCM_COMPLEX_VALUE): Use GUILE_I instead of _Complex_I

directly, and only if GUILE_I was defined by the configure step.
(scm_log, scm_log10, scm_exp, scm_sqrt): Use SCM_COMPLEX_VALUE
code only if SCM_COMPLEX_VALUE is defined.

* configure.in (--without-64-calls): Use AC_MSG_CHECKING and
AC_MSG_RESULT instead of just echo.
(GUILE_I): New programs to try using _Complex_I or 1.0fi for the
imaginary unit.

ChangeLog

@@ -1,3 +1,10 @@
+2008-02-11  Neil Jerram  <neil@ossau.uklinux.net>
+
+	* configure.in (--without-64-calls): Use AC_MSG_CHECKING and
+	AC_MSG_RESULT instead of just echo.
+	(GUILE_I): New programs to try using _Complex_I or 1.0fi for the
+	imaginary unit.
+
 2008-02-06  Neil Jerram  <neil@ossau.uklinux.net>
 
 	* configure.in: Default to --without-64-calls for

NEWS

@@ -55,6 +55,7 @@ system and library calls.
 ** Fixed wrong-type-arg errors when creating zero length SRFI-4
 uniform vectors on AIX.
 ** Fixed a deadlock that occurs upon GC with multiple threads.
+** Fixed compile problem with GCC on Solaris and AIX (use of _Complex_I)
 
 * New modules (see the manual for details)
 

configure.in

@@ -196,6 +196,7 @@ dnl  to use a "64" call, and hence that by using --without-64-calls we're
 dnl  missing out on that.  If so, someone can work on that in the future.
 dnl  For now, --without-64-calls allows Guile to build on OSs where it
 dnl  wasn't building before.
+AC_MSG_CHECKING([whether to use system and library "64" calls])
 AC_ARG_WITH([64-calls],
   AC_HELP_STRING([--without-64-calls],
                  [don't attempt to use system and library calls with "64" in their names]),
@@ -209,7 +210,7 @@ AC_ARG_WITH([64-calls],
        use_64_calls=no
        ;;
    esac])
-echo "use_64_calls=$use_64_calls"
+AC_MSG_RESULT($use_64_calls)
 case "$use_64_calls" in
   y* )
     AC_DEFINE(GUILE_USE_64_CALLS, 1,
@@ -719,6 +720,30 @@ AC_SEARCH_LIBS(crypt, crypt,
   [AC_DEFINE(HAVE_CRYPT,1,
              [Define to 1 if you have the `crypt' function.])])
 
+# When compiling with GCC on some OSs (Solaris, AIX), _Complex_I doesn't work;
+# in the reported cases so far, 1.0fi works well instead.
+if test "$ac_cv_type_complex_double" = yes; then
+  AC_MSG_CHECKING([for i])
+  AC_TRY_COMPILE([
+#if HAVE_COMPLEX_H
+#include <complex.h>
+#endif
+complex double z;
+],[
+z = _Complex_I;
+],[AC_DEFINE(GUILE_I,_Complex_I,[The imaginary unit (positive square root of -1).])
+   AC_MSG_RESULT([_Complex_I])],[AC_TRY_COMPILE([
+#if HAVE_COMPLEX_H
+#include <complex.h>
+#endif
+complex double z;
+],[
+z = 1.0fi;
+],[AC_DEFINE(GUILE_I,1.0fi)
+   AC_MSG_RESULT([1.0fi])],[ac_cv_type_complex_double=no
+                            AC_MSG_RESULT([not available])])])
+fi
+
 # glibc 2.3.6 (circa 2006) and various prior versions had a bug where
 # csqrt(-i) returned a negative real part, when it should be positive
 # for the principal root.

libguile/ChangeLog

@@ -1,3 +1,10 @@
+2008-02-11  Neil Jerram  <neil@ossau.uklinux.net>
+
+	* numbers.c (SCM_COMPLEX_VALUE): Use GUILE_I instead of _Complex_I
+	directly, and only if GUILE_I was defined by the configure step.
+	(scm_log, scm_log10, scm_exp, scm_sqrt): Use SCM_COMPLEX_VALUE
+	code only if SCM_COMPLEX_VALUE is defined.
+
 2008-02-07  Ludovic Courtès  <ludo@gnu.org>
 
 	Fix bug #21378.

libguile/numbers.c

@@ -162,11 +162,12 @@ xisnan (double x)
 #endif
 }
 
-
+#if defined (GUILE_I)
 /* For an SCM object Z which is a complex number (ie. satisfies
    SCM_COMPLEXP), return its value as a C level "complex double". */
 #define SCM_COMPLEX_VALUE(z)                                    \
-  (SCM_COMPLEX_REAL (z) + _Complex_I * SCM_COMPLEX_IMAG (z))
+  (SCM_COMPLEX_REAL (z) + GUILE_I * SCM_COMPLEX_IMAG (z))
+#endif
 
 /* Convert a C "complex double" to an SCM value. */
 #if HAVE_COMPLEX_DOUBLE
@@ -6011,7 +6012,7 @@ SCM_DEFINE (scm_log, "log", 1, 0, 0,
 {
   if (SCM_COMPLEXP (z))
     {
-#if HAVE_COMPLEX_DOUBLE && HAVE_CLOG
+#if HAVE_COMPLEX_DOUBLE && HAVE_CLOG && defined (SCM_COMPLEX_VALUE)
       return scm_from_complex_double (clog (SCM_COMPLEX_VALUE (z)));
 #else
       double re = SCM_COMPLEX_REAL (z);
@@ -6045,7 +6046,7 @@ SCM_DEFINE (scm_log10, "log10", 1, 0, 0,
       /* Mingw has clog() but not clog10().  (Maybe it'd be worth using
          clog() and a multiply by M_LOG10E, rather than the fallback
          log10+hypot+atan2.)  */
-#if HAVE_COMPLEX_DOUBLE && HAVE_CLOG10
+#if HAVE_COMPLEX_DOUBLE && HAVE_CLOG10 && defined (SCM_COMPLEX_VALUE)
       return scm_from_complex_double (clog10 (SCM_COMPLEX_VALUE (z)));
 #else
       double re = SCM_COMPLEX_REAL (z);
@@ -6077,7 +6078,7 @@ SCM_DEFINE (scm_exp, "exp", 1, 0, 0,
 {
   if (SCM_COMPLEXP (z))
     {
-#if HAVE_COMPLEX_DOUBLE && HAVE_CEXP
+#if HAVE_COMPLEX_DOUBLE && HAVE_CEXP && defined (SCM_COMPLEX_VALUE)
       return scm_from_complex_double (cexp (SCM_COMPLEX_VALUE (z)));
 #else
       return scm_c_make_polar (exp (SCM_COMPLEX_REAL (z)),
@@ -6111,7 +6112,7 @@ SCM_DEFINE (scm_sqrt, "sqrt", 1, 0, 0,
 {
   if (SCM_COMPLEXP (x))
     {
-#if HAVE_COMPLEX_DOUBLE && HAVE_USABLE_CSQRT
+#if HAVE_COMPLEX_DOUBLE && HAVE_USABLE_CSQRT && defined (SCM_COMPLEX_VALUE)
       return scm_from_complex_double (csqrt (SCM_COMPLEX_VALUE (x)));
 #else
       double re = SCM_COMPLEX_REAL (x);