conditional compilation isnan isinf

configure.ac

@@ -665,9 +665,11 @@ AC_CHECK_DECLS([isnan], [], [], [[#include <math.h>]])
 if test "x$ac_cv_have_decl_isinf" != xyes; then
     AC_CHECK_FUNC([isinf])
 fi
+AM_CONDITIONAL([HAVE_DECL_ISINF_WANTED], [test "x$ac_cv_have_decl_isinf" = xyes])
 if test "x$ac_cv_have_decl_isnan" != xyes; then
     AC_CHECK_FUNC([isnan])
 fi
+AM_CONDITIONAL([HAVE_DECL_ISNAN_WANTED], [test "x$ac_cv_have_decl_isnan" = xyes])
 
 # If user enables garbage collection, look for garbage collector
 if test "x$TCL_PACKAGE_PATH" = x; then

src/maths/misc/Makefile.am

@@ -9,8 +9,6 @@ libmathmisc_la_SOURCES = \
 	bernoull.c	\
 	erfc.c		\
 	equality.c	\
-	isinf.c		\
-	isnan.c		\
 	logb.c		\
 	scalb.c		\
 	norm.h		\
@@ -18,6 +16,15 @@ libmathmisc_la_SOURCES = \
 	randnumb.c
 
 
+if !HAVE_DECL_ISINF_WANTED
+libmathmisc_la_SOURCES += isinf.c
+endif
+
+if !HAVE_DECL_ISNAN_WANTED
+libmathmisc_la_SOURCES += isnan.c
+endif
+
+
 EXTRA_DIST = test_accuracy.c test_erfc.c
 
 AM_CPPFLAGS = @AM_CPPFLAGS@ -I$(top_srcdir)/src/include

src/maths/misc/isinf.c

@@ -1,6 +1,5 @@
 #include "ngspice/ngspice.h"
 
-#if !HAVE_DECL_ISINF
 #ifndef HAVE_ISINF
 #if defined(HAVE_FINITE)
 
@@ -30,4 +29,3 @@ isinf (const double x)
 #else /* HAVE_ISINF */
 int Dummy_Symbol_5;
 #endif /* HAVE_ISINF */
-#endif /* HAVE_DECL_ISINF */

src/maths/misc/isnan.c

@@ -1,6 +1,5 @@
 #include "ngspice/ngspice.h"
 
-#if !HAVE_DECL_ISNAN
 #ifndef HAVE_ISNAN
 
 /* isnan (originally) for SOI devices in MINGW32  hvogt (dev.c) */
@@ -48,4 +47,3 @@ isnan(double value)
 #else /* HAVE_ISNAN */
 int Dummy_Symbol_4;
 #endif /* HAVE_ISNAN */
-#endif /* HAVE_DECL_ISNAN */