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 c++ -DNO_MATHOMS -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -Wall -Werror=pointer-arith -Werror=vla -Wextra -Wno-long-long -Wno-declaration-after-statement -Wc++-compat -Wwrite-strings -O2   -DVERSION=\"2.204\" -DXS_VERSION=\"2.204\" -fPIC "-I../.."  -DBZ_NO_STDIO  compress.c
compress.c:190:13: error: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
            register UChar  rtmp;
            ^~~~~~~~~

#define register

gcc -c  -I. -D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -Wall -Werror=pointer-arith -Werror=vla -Wextra -Wno-long-long -Wno-declaration-after-statement -Wc++-compat -Wwrite-strings -O3   -DVERSION=\"2.101\" -DXS_VERSION=\"2.101\" -fPIC "-I../.."  -Wall -Wno-comment  -DBZ_NO_STDIO  compress.c
compress.c: In function ‘BZ2_compressBlock’:
compress.c:392:54: warning: ‘cost[5]’ may be used uninitialized in this function [-Wmaybe-uninitialized]
                for (t = 0; t < nGroups; t++) cost[t] += s->len[t][icv];
                                                      ^~
compress.c:256:11: note: ‘cost[5]’ was declared here
    UInt16 cost[BZ_N_GROUPS];
           ^~~~
compress.c:402:21: warning: ‘cost[3]’ may be used uninitialized in this function [-Wmaybe-uninitialized]
             if (cost[t] < bc) { bc = cost[t]; bt = t; };
                 ~~~~^~~
compress.c:256:11: note: ‘cost[3]’ was declared here
    UInt16 cost[BZ_N_GROUPS];
           ^~~~
compress.c:402:21: warning: ‘cost[2]’ may be used uninitialized in this function [-Wmaybe-uninitialized]
             if (cost[t] < bc) { bc = cost[t]; bt = t; };
                 ~~~~^~~
compress.c:256:11: note: ‘cost[2]’ was declared here
    UInt16 cost[BZ_N_GROUPS];
           ^~~~

"bzlib.c", line 862: warning #2111-D: statement is unreachable
     AssertH ( 0, 6001 );
"compress.c", line 261: warning #2549-D: variable "nBytes" is used before its
          value is set
     ((void)nBytes); /* Silence variable ‘nBytes’ set but not used warning */

$ git diff
diff --git a/bzip2-src/bzlib.c b/bzip2-src/bzlib.c
index 88118bf..e870307 100644
--- a/bzip2-src/bzlib.c
+++ b/bzip2-src/bzlib.c
@@ -859,9 +859,7 @@ int BZ_API(BZ2_bzDecompress) ( bz_stream *strm )
       }
    }
 
-   AssertH ( 0, 6001 );
-
-   return 0;  /*NOTREACHED*/
+   /*NOTREACHED*/
 }
 
 
diff --git a/bzip2-src/compress.c b/bzip2-src/compress.c
index 99cd709..a43ec65 100644
--- a/bzip2-src/compress.c
+++ b/bzip2-src/compress.c
@@ -240,7 +240,8 @@ void sendMTFValues ( EState* s )
 {
    Int32 v, t, i, j, gs, ge, totc, bt, bc, iter;
    Int32 nSelectors, alphaSize, minLen, maxLen, selCtr;
-   Int32 nGroups, nBytes;
+   Int32 nGroups;
+   Int32 nBytes = 0;
 
    /*--
    UChar  len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];

$ patch -R -p1 < bzip2.patch 
can't find file to patch at input line 5
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|diff --git a/bzip2.c b/bzip2.c
|index d95d280..7852cc4 100644
|--- a/bzip2.c
|+++ b/bzip2.c
--------------------------
File to patch: 
Skip this patch? [y] 
Skipping patch.
1 out of 1 hunk ignored
can't find file to patch at input line 22
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|diff --git a/bzip2recover.c b/bzip2recover.c
|index a8131e0..0925048 100644
|--- a/bzip2recover.c
|+++ b/bzip2recover.c
--------------------------
File to patch: 
Skip this patch? [y] 
Skipping patch.
2 out of 2 hunks ignored
patching file bzlib.c
Hunk #1 succeeded at 169 (offset 4 lines).
Hunk #2 succeeded at 178 (offset 4 lines).
Hunk #3 FAILED at 362.
Hunk #4 succeeded at 413 (offset 4 lines).
Hunk #5 succeeded at 473 (offset 4 lines).
Hunk #6 succeeded at 509 (offset 4 lines).
Hunk #7 succeeded at 688 (offset 4 lines).
Hunk #8 succeeded at 814 (offset 4 lines).
Hunk #9 succeeded at 867 (offset 4 lines).
Hunk #10 succeeded at 938 (offset 4 lines).
Hunk #11 succeeded at 986 (offset 4 lines).
Hunk #12 FAILED at 1107.
Hunk #13 succeeded at 1183 (offset 4 lines).
2 out of 13 hunks FAILED -- saving rejects to file bzlib.c.rej
patching file bzlib_private.h
patching file crctable.c
patching file decompress.c
Hunk #1 FAILED at 209.
1 out of 1 hunk FAILED -- saving rejects to file decompress.c.rej
patching file randtable.c
Hunk #1 FAILED at 23.
1 out of 1 hunk FAILED -- saving rejects to file randtable.c.rej