Merge branch 'js/comma-semicolon-confusion'

Code clean-up.

* js/comma-semicolon-confusion:
  detect-compiler: detect clang even if it found CUDA
  clang: warn when the comma operator is used
  compat/regex: explicitly mark intentional use of the comma operator
  wildmatch: avoid using of the comma operator
  diff-delta: avoid using the comma operator
  xdiff: avoid using the comma operator unnecessarily
  clar: avoid using the comma operator unnecessarily
  kwset: avoid using the comma operator unnecessarily
  rebase: avoid using the comma operator unnecessarily
  remote-curl: avoid using the comma operator unnecessarily

config.mak.dev

@@ -41,6 +41,10 @@ DEVELOPER_CFLAGS += -Wwrite-strings
 DEVELOPER_CFLAGS += -fno-common
 DEVELOPER_CFLAGS += -Wunreachable-code
 
+ifneq ($(filter clang9,$(COMPILER_FEATURES)),)
+DEVELOPER_CFLAGS += -Wcomma
+endif
+
 ifneq ($(filter clang4,$(COMPILER_FEATURES)),)
 DEVELOPER_CFLAGS += -Wtautological-constant-out-of-range-compare
 endif