Merge remote-tracking branch 'origin/maint'

* origin/maint:
  news: prepare for forthcoming release
  doc: explain how mid-rule actions are translated
  error: use better locations for unused midrule values
  doc: various minor improvements and fixes
  tests: ignore more useless compiler warnings
  tests: be robust to C being compiled with a C++11 compiler
  build: beware of Clang++ not supporting POSIXLY_CORRECT
  maint: post-release administrivia
  version 2.6.90
  build: fix syntax-check error.
  cpp: simplify the Flex version checking macro
  news: improve the carets example and fix a typo
  cpp: improve the Flex version checking macro
  carets: improve the code
  maint: update news
  build: keep -Wmissing-declarations and -Wmissing-prototypes for modern GCCs
  build: drop -Wcast-qual
  gnulib: update

Conflicts:
	NEWS
	doc/Makefile.am
	doc/bison.texi
	gnulib
	src/reader.c
	tests/actions.at
	tests/atlocal.in
	tests/input.at

src/flex-scanner.h

@@ -21,18 +21,12 @@
 # error "FLEX_PREFIX not defined"
 #endif
 
-/* Whether this version of Flex is (strictly) greater than
-   Major.Minor.Subminor.  */
-#ifdef YY_FLEX_SUBMINOR_VERSION
-# define FLEX_VERSION               \
-  (YY_FLEX_MAJOR_VERSION) * 1000000 \
-+ (YY_FLEX_MINOR_VERSION) * 1000    \
-+ (YY_FLEX_SUBMINOR_VERSION)
-#else
-# define FLEX_VERSION               \
-  (YY_FLEX_MAJOR_VERSION) * 1000000 \
-+ (YY_FLEX_MINOR_VERSION) * 1000
-#endif
+/* Flex full version as a number.  */
+#define FLEX_VERSION                    \
+  ((YY_FLEX_MAJOR_VERSION) * 1000000    \
+   + (YY_FLEX_MINOR_VERSION) * 1000     \
+   + (YY_FLEX_SUBMINOR_VERSION))
+
 /* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used.  */
 # if FLEX_VERSION <= 2005031
 int   FLEX_PREFIX (get_lineno) (void);