Add config check for Xrand48() functions

This fixes some compile errors under MinGW, which does not provide those
functions.

Signed-off-by: Paul Cercueil <[email protected]>

Author: Paul Cercueil

cmake/msvc/config.h

@@ -61,7 +61,4 @@ static inline float rintf(float x){return (x > 0.0f)? floorf(x + 0.5f) : ceilf(x
 static inline long int random (void) { return rand(); }
 static inline void srandom (unsigned int seed) { srand(seed); }
 
-#define srand48(seed) srand(seed)
-#define drand48() (double(rand()) / RAND_MAX)
-
 #endif // _MSC_CONFIG_H_ ]

gr-analog/lib/fastnoise_source_X_impl.cc.t

@@ -144,7 +144,7 @@ namespace gr {
 
     @TYPE@ @IMPL_NAME@::sample()
     {
-#ifdef __USE_GNU
+#ifdef HAVE_RAND48
         size_t idx = lrand48() % d_samples.size();
 #else
         size_t idx = rand() % d_samples.size();
@@ -153,7 +153,7 @@ namespace gr {
     }
 
 #ifndef FASTNOISE_RANDOM_SIGN
-#ifdef _MSC_VER
+#ifndef HAVE_RAND48
 #define FASTNOISE_RANDOM_SIGN       ((rand()%2==0)?1:-1)
 #else
 #define FASTNOISE_RANDOM_SIGN       ((lrand48()%2==0)?1:-1)

gr-blocks/lib/ConfigChecks.cmake

@@ -89,3 +89,10 @@ CHECK_CXX_SOURCE_COMPILES("
     " HAVE_COSF
 )
 GR_ADD_COND_DEF(HAVE_COSF)
+
+CHECK_CXX_SOURCE_COMPILES("
+    #include <stdlib.h>
+	int main(){srand48(0); drand48(); lrand48(); return 0;}
+	" HAVE_RAND48
+)
+GR_ADD_COND_DEF(HAVE_RAND48)

gr-blocks/lib/test_tag_variable_rate_ff_impl.cc

@@ -57,7 +57,11 @@ namespace gr {
       d_new_in = 0;
       d_last_out = 0;
 
+#ifdef HAVE_RAND48
       srand48(time(NULL));
+#else
+      srand(time(NULL));
+#endif
     }
 
     test_tag_variable_rate_ff_impl::~test_tag_variable_rate_ff_impl()
@@ -78,7 +82,11 @@ namespace gr {
       GR_LOG_DEBUG(d_logger, boost::format("noutput_items: %1%") % noutput_items);
 
       if(d_update_once) {
+#ifdef HAVE_RAND48
         if(drand48() > 0.5) {
+#else
+        if (rand() > RAND_MAX / 2) {
+#endif
           d_rrate += d_update_step;
         }
         else {
@@ -95,7 +103,11 @@ namespace gr {
       while(i < ninput_items[0]) {
 
         if(!d_update_once) {
+#ifdef HAVE_RAND48
           if(drand48() > 0.5) {
+#else
+          if (rand() > RAND_MAX / 2) {
+#endif
             d_rrate += d_update_step;
           }
           else {