master 167bf3408e4: Pacify clang 15.0.6 on Fedora 37

[Paul Eggert]

branch: master
commit 167bf3408e437704b27171c6fad5d15bbc623b3a
Author: Paul Eggert <eggert@cs.ucla.edu>
Commit: Paul Eggert <eggert@cs.ucla.edu>

    Pacify clang 15.0.6 on Fedora 37
    
    * configure.ac: Suppress clang -Wbitwise-instead-of-logical,
    as there’s nothing wrong with using & and | on bool.
    * src/coding.c: Suppress -Wunused-but-set-variable in this file,
    as it’s too much trouble to recode to pacify clang.
---
 configure.ac | 1 +
 src/coding.c | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/configure.ac b/configure.ac
index d7aec4414e3..fc17dbd8318 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1139,6 +1139,7 @@ AS_IF([test $gl_gcc_warnings = no],
 
   # clang is unduly picky about some things.
   if test "$emacs_cv_clang" = yes; then
+    gl_WARN_ADD([-Wno-bitwise-instead-of-logical])
     gl_WARN_ADD([-Wno-missing-braces])
     gl_WARN_ADD([-Wno-null-pointer-arithmetic])
     gl_WARN_ADD([-Wno-implicit-const-int-float-conversion])
diff --git a/src/coding.c b/src/coding.c
index 49dcd8634f3..79461addd1a 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -651,6 +651,12 @@ growable_destination (struct coding_system *coding)
     consumed_chars++;                                  \
   } while (0)
 
+/* Suppress clang warnings about consumed_chars never being used.
+   Although correct, the warnings are too much trouble to code around.  */
+#if 13 <= __clang_major__
+# pragma clang diagnostic ignored "-Wunused-but-set-variable"
+#endif
+
 /* Safely get two bytes from the source text pointed by SRC which ends
    at SRC_END, and set C1 and C2 to those bytes while skipping the
    heading multibyte characters.  If there are not enough bytes in the