1 files changed, 28 insertions, 6 deletions

diff --git a/autoconfig.cpp b/autoconfig.cpp
index 9d09412..0df3dbd 100644
--- a/autoconfig.cpp
+++ b/autoconfig.cpp
@@ -5,12 +5,18 @@
 #include <string.h>
 
 FILE *fOut = NULL;
+bool bHasDevNull;
 
 bool testCpp( const char *prog )
 {
-    FILE *pop = popen("g++ -x c++ - -o /dev/null", "w");
+    FILE *pop = popen(
+        bHasDevNull?"g++ -x c++ - -o /dev/null":"g++ -x c++ - -o trash.del",
+        "w");
     fwrite( prog, 1, strlen( prog ), pop );
-    return pclose(pop) == 0;
+    bool bFound = (pclose(pop) == 0);
+    if( !bHasDevNull )
+        unlink("trash.del");
+    return bFound;
 }
 
 bool testLib( const char *lib, const char *symname, const char *humname )
@@ -21,25 +27,31 @@ bool testLib( const char *lib, const char *symname, const char *humname )
     char *cmdline = (char *)malloc( 29+strlen(lib) );
     strcpy( cmdline, "g++ -x c++ -l");
     strcat( cmdline, lib );
-    strcat( cmdline, " - -o /dev/null");
+    if( bHasDevNull )
+        strcat( cmdline, " - -o /dev/null");
+    else
+        strcat( cmdline, " - -o trash.del");
 
     FILE *pop = popen( cmdline, "w");
     fwrite( prog, 1, strlen( prog ), pop );
     free( cmdline );
-    if( pclose(pop) == 0 )
+    bool bFound = (pclose(pop) == 0);
+    if( bFound )
     {
         printf("found.\n");
         fprintf( fOut, "#define BU_FEATURE_%s 1\n", symname );
         fprintf( fOut, "#define BU_HAS_%s\n", symname );
-        return false;
     }
     else
     {
         printf("missing.\n");
         fprintf( fOut, "#define BU_FEATURE_%s 0\n", symname );
         fprintf( fOut, "#define BU_MISSING_%s\n", symname );
-        return true;
     }
+
+    if( !bHasDevNull )
+        unlink("trash.del");
+    return bFound;
 }
 
 void detectEndianness()
@@ -67,6 +79,15 @@ void detectEndianness()
     }
 }
 
+bool fileExists( const char *filename )
+{
+    FILE *fTmp = fopen(filename, "rw");
+    if( fTmp == NULL )
+        return false;
+    fclose( fTmp );
+    return true;
+}
+
 int main( int argc, char *argv[] )
 {
     if( argc == 1 )
@@ -79,6 +100,7 @@ int main( int argc, char *argv[] )
             );
         return 127;
     }
+    bHasDevNull = fileExists("/dev/null");
     if( strcmp( argv[1], "src/autoconfig.h" ) == 0 )
     {
         fOut = fopen( argv[1], "w" );