Fix (and test) more Clang 14 compiler warnings

-Woverlength-strings, -Wshift-negative-value, -Wsign-compare

.github/workflows/build.yml

@@ -167,7 +167,8 @@ jobs:
           mkdir build
           pushd build
           cmake -G"Unix Makefiles" -DWITH_JPEG8=1 \
-            -DCMAKE_C_FLAGS='--std=gnu90 -Wall -Werror -Wextra -Wpedantic -pedantic-errors -Wdouble-promotion -Wformat-overflow=2 -Wformat-security -Wformat-signedness -Wformat-truncation=2 -Wformat-y2k -Wmissing-include-dirs -Wshift-overflow=2 -Wswitch-bool -Wno-unused-parameter -Wuninitialized -Wstrict-overflow=2 -Wstringop-overflow=4 -Wstringop-truncation -Wduplicated-branches -Wduplicated-cond -Wdeclaration-after-statement -Wshadow -Wunsafe-loop-optimizations -Wundef -Wcast-align -Wno-clobbered -Wjump-misses-init -Wno-sign-compare -Wlogical-op -Waggregate-return -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-declarations -Wpacked -Wredundant-decls -Wnested-externs -Winline -Wno-long-long -Wdisabled-optimization -Wno-overlength-strings' \
+            -DCMAKE_C_FLAGS='--std=gnu90 -Wall -Werror -Wextra -Wmost -Wnon-gcc -Wpedantic -pedantic-errors -Walloca -Wanon-enum-enum-conversion -Warray-bounds-pointer-arithmetic -Wbitfield-enum-conversion -Wc99-extensions -Wc2x-extensions -Wcast-function-type -Wcompound-token-split -Wdate-time -Wdeclaration-after-statement -Wdeprecated -Wdocumentation -Wdocumentation-pedantic -Wdouble-promotion -Wduplicate-decl-specifier -Wduplicate-enum -Wempty-init-stmt -Wexpansion-to-defined -Wextra-semi -Wformat=2 -Wformat-non-iso -Wno-format-nonliteral -Wformat-pedantic -Wformat-type-confusion -Wfour-char-constants -Wgcc-compat -Wgnu -Wheader-hygiene -Widiomatic-parentheses -Wignored-qualifiers -Wimplicit-fallthrough -Wno-implicit-int-conversion -Wincompatible-function-pointer-types -Wno-long-long -Wloop-analysis -Wmain -Wmax-tokens -Wmisleading-indentation -Wmissing-field-initializers -Wmissing-prototypes -Wmissing-variable-declarations -Wnewline-eof -Wnonportable-system-include-path -Wnullable-to-nonnull-conversion -Wold-style-cast -Wover-aligned -Wparentheses -Wpointer-arith -Wpragmas -Wpre-c2x-compat -Wredundant-parens -Wself-assign -Wshadow-all -Wshift-sign-overflow -Wno-shorten-64-to-32 -Wno-sign-conversion -Wsometimes-uninitialized -Wstatic-in-inline -Wstrict-prototypes -Wswitch-default -Wtautological-constant-in-range-compare -Wthread-safety -Wthread-safety-verbose -Wunaligned-access -Wundef -Wundef-prefix -Wundefined-func-template -Wuninitialized -Wunneeded-internal-declaration -Wunreachable-code-fallthrough -Wno-unused-command-line-argument -Wunused-member-function -Wno-unused-parameter -Wvariadic-macros -Wzero-as-null-pointer-constant -Wzero-length-array' \
+            -DCMAKE_C_COMPILER=clang-14 \
             ..
           export NUMCPUS=`grep -c '^processor' /proc/cpuinfo`
           make -j$NUMCPUS --load-average=$NUMCPUS

CMakeLists.txt

@@ -494,7 +494,7 @@ if(UNIX)
           return 1; /* right shift is signed */
         /* see if unsigned-shift hack will fix it. */
         /* we can't just test exact value since it depends on width of long... */
-        res |= (~0L) << (32-4);
+        res |= 0xFFFFFFFFL << (32-4);
         if (res == -0x7F7E80CL)
           return 0; /* right shift is unsigned */
         printf(\"Right shift isn't acting as I expect it to.\\\\n\");

cjpeg.c

@@ -328,7 +328,8 @@ parse_switches(j_compress_ptr cinfo, int argc, char **argv,
       if (!printed_version) {
         fprintf(stderr, "%s version %s (build %s)\n",
                 PACKAGE_NAME, VERSION, BUILD);
-        fprintf(stderr, "%s\n\n", JCOPYRIGHT);
+        fprintf(stderr, JCOPYRIGHT1);
+        fprintf(stderr, JCOPYRIGHT2 "\n");
         fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
                 JVERSION);
         printed_version = TRUE;

djpeg.c

@@ -269,7 +269,8 @@ parse_switches(j_decompress_ptr cinfo, int argc, char **argv,
       if (!printed_version) {
         fprintf(stderr, "%s version %s (build %s)\n",
                 PACKAGE_NAME, VERSION, BUILD);
-        fprintf(stderr, "%s\n\n", JCOPYRIGHT);
+        fprintf(stderr, JCOPYRIGHT1);
+        fprintf(stderr, JCOPYRIGHT2 "\n");
         fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
                 JVERSION);
         printed_version = TRUE;

jpegtran.c

@@ -241,7 +241,8 @@ parse_switches(j_compress_ptr cinfo, int argc, char **argv,
       if (!printed_version) {
         fprintf(stderr, "%s version %s (build %s)\n",
                 PACKAGE_NAME, VERSION, BUILD);
-        fprintf(stderr, "%s\n\n", JCOPYRIGHT);
+        fprintf(stderr, JCOPYRIGHT1);
+        fprintf(stderr, JCOPYRIGHT2 "\n");
         fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",
                 JVERSION);
         printed_version = TRUE;

jversion.h.in

@@ -36,19 +36,20 @@
  *   their code
  */
 
-#define JCOPYRIGHT \
+#define JCOPYRIGHT1 \
   "Copyright (C) 2009-2024 D. R. Commander\n" \
   "Copyright (C) 2015, 2020 Google, Inc.\n" \
   "Copyright (C) 2019-2020 Arm Limited\n" \
   "Copyright (C) 2015-2016, 2018 Matthieu Darbois\n" \
   "Copyright (C) 2011-2016 Siarhei Siamashka\n" \
-  "Copyright (C) 2015 Intel Corporation\n" \
+  "Copyright (C) 2015 Intel Corporation\n"
+#define JCOPYRIGHT2 \
   "Copyright (C) 2013-2014 Linaro Limited\n" \
   "Copyright (C) 2013-2014 MIPS Technologies, Inc.\n" \
   "Copyright (C) 2009, 2012 Pierre Ossman for Cendio AB\n" \
   "Copyright (C) 2009-2011 Nokia Corporation and/or its subsidiary(-ies)\n" \
   "Copyright (C) 1999-2006 MIYASAKA Masaru\n" \
-  "Copyright (C) 1991-2020 Thomas G. Lane, Guido Vollbeding"
+  "Copyright (C) 1991-2020 Thomas G. Lane, Guido Vollbeding\n"
 
 #define JCOPYRIGHT_SHORT \
   "Copyright (C) @COPYRIGHT_YEAR@ The libjpeg-turbo Project and many others"

md5/md5hl.c

@@ -6,7 +6,8 @@
  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
  * ----------------------------------------------------------------------------
  * libjpeg-turbo Modifications:
- * Copyright (C)2016, 2018-2019, 2022 D. R. Commander.  All Rights Reserved.
+ * Copyright (C)2016, 2018-2019, 2022, 2024 D. R. Commander.
+ *                                          All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -111,7 +112,7 @@ char *MD5FileChunk(const char *filename, char *buf, off_t ofs, off_t len)
   n = len;
   i = 0;
   while (n > 0) {
-    if (n > sizeof(buffer))
+    if ((size_t)n > sizeof(buffer))
       i = read(f, buffer, sizeof(buffer));
     else
       i = read(f, buffer, n);