Added two checks for throwCantPackExact.

src/p_exe.cpp

@@ -248,6 +248,9 @@ unsigned optimize_relocs(upx_byte *b, const unsigned size,
                          const upx_byte *relocs, const unsigned nrelocs,
                          upx_byte *crel, bool *has_9a)
 {
+    if (opt->exact)
+        throwCantPackExact();
+
     upx_byte * const crel_save = crel;
     unsigned i;
     unsigned seg_high = 0;

src/packer.cpp

@@ -871,6 +871,9 @@ upx_byte *Packer::optimizeReloc32(upx_byte *in, unsigned relocnum,
                                   upx_byte *out, upx_byte *image,
                                   int bswap, int *big)
 {
+    if (opt->exact)
+        throwCantPackExact();
+
     *big = 0;
     if (relocnum == 0)
         return out;