Several float specializations break the program in Linux/AMD64

src/aclocal.m4

@@ -194,7 +194,7 @@ case "${host_os}" in
 		BUNDLE_LDFLAGS="-shared ${LDFLAGS}"
 		LDRPATH='-Wl,--rpath,~A'
 		clibs="-ldl"
-		# Maybe CFLAGS="-D_ISOC99_SOURCE ${CFLAGS}" ???
+		CFLAGS="-D_GNU_SOURCE ${CFLAGS}"
 		;;
 	kfreebsd*-gnu)
 		thehost='kfreebsd'
@@ -204,7 +204,7 @@ case "${host_os}" in
 		BUNDLE_LDFLAGS="-shared ${LDFLAGS}"
 		LDRPATH='-Wl,--rpath,/usr/lib/ecl/'
 		clibs="-ldl"
-		# Maybe CFLAGS="-D_ISOC99_SOURCE ${CFLAGS}" ???
+		CFLAGS="-D_GNU_SOURCE ${CFLAGS}"
 		;;
 	freebsd*)
 		thehost='freebsd'

src/c/num_sfun.d

@@ -186,7 +186,7 @@ cl_log1(cl_object x)
 	case t_fixnum:
 	case t_bignum:
 	case t_ratio:
-		return1(make_singlefloat(logf(number_to_double(x))));
+		return1(make_singlefloat(log(number_to_double(x))));
 #ifdef ECL_SHORT_FLOAT
 	case t_shortfloat:
 		return1(make_shortfloat(logf(ecl_short_float(x))));

src/h/config.h.in

@@ -224,6 +224,7 @@ typedef unsigned @CL_FIXNUM_TYPE@ cl_hashkey;
 /* the tzset() function gets the current time zone			*/
 #undef HAVE_TZSET
 /* several floating point functions (ISO C99)				*/
+#if 0
 #undef HAVE_EXPF
 #undef HAVE_LOGF
 #undef HAVE_SQRTF
@@ -233,6 +234,7 @@ typedef unsigned @CL_FIXNUM_TYPE@ cl_hashkey;
 #undef HAVE_SINHF
 #undef HAVE_COSHF
 #undef HAVE_TANHF
+#endif
 #undef HAVE_FLOORF
 #undef HAVE_CEILF
 #undef HAVE_FABSF

src/h/internal.h

@@ -252,6 +252,8 @@ extern cl_object si_get_library_pathname(void);
 /*
  * Fake several ISO C99 mathematical functions
  */
+#define _GNU_SOURCE
+
 #ifndef HAVE_EXPF
 # define expf(x) exp((float)x)
 #endif