Based on a patch from Alexandre Oliva, allow uClibc to compile

with __NR_mmap is not available (i.e. only __NR_mmap2)

ldso/include/dl-syscall.h

@@ -103,6 +103,7 @@ static inline _syscall0(gid_t, _dl_getpid);
 #define __NR__dl_readlink __NR_readlink
 static inline _syscall3(int, _dl_readlink, const char *, path, char *, buf, size_t, bufsiz);
 
+#ifdef __NR_mmap
 #if defined(__powerpc__) || defined(__mips__) || defined(__sh__)
 /* PowerPC, MIPS and SuperH have a different calling convention for mmap(). */
 #define __NR__dl_mmap __NR_mmap
@@ -126,7 +127,21 @@ static inline void * _dl_mmap(void * addr, unsigned long size, int prot,
 	return (void *) _dl_mmap_real(buffer);
 }
 #endif
-
+#elif defined __NR_mmap2
+#define __NR___syscall_mmap2       __NR_mmap2
+static inline _syscall6(__ptr_t, __syscall_mmap2, __ptr_t, addr,
+		size_t, len, int, prot, int, flags, int, fd, off_t, offset);
+/*always 12, even on architectures where PAGE_SHIFT != 12 */
+#define MMAP2_PAGE_SHIFT 12
+static inline void * _dl_mmap(void * addr, unsigned long size, int prot,
+		int flags, int fd, unsigned long offset)
+{
+    if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1))
+	return MAP_FAILED;
+    return(__syscall_mmap2(addr, size, prot, flags,
+		fd, (off_t) (offset >> MMAP2_PAGE_SHIFT)));
+}
+#endif
 
 #endif /* _LD_SYSCALL_H_ */
 

libc/sysdeps/linux/common/mmap.c

@@ -11,6 +11,7 @@
 #include <unistd.h>
 #include <sys/mman.h>
 
+#ifdef __NR_mmap
 #define __NR__mmap __NR_mmap
 _syscall1(__ptr_t, _mmap, unsigned long *, buffer);
 __ptr_t mmap(__ptr_t addr, size_t len, int prot,
@@ -26,3 +27,4 @@ __ptr_t mmap(__ptr_t addr, size_t len, int prot,
 	buffer[5] = (unsigned long) offset;
 	return (__ptr_t) _mmap(buffer);
 }
+#endif