Remove unused PHP_PROG_LEX macro

Since PHP 5.3 flex lexer has been replaced with re2c. Commit
0f9e2b1 made PHP_PROG_LEX macro still
available for BC.

In commit df6bd50 it was updated. Since
this macro is entirely not used in PHP source code anymore from PHP 5.3
and up, this patch removes it together with some old traces of warnings
suppression and comments.

Author: petk

acinclude.m4

@@ -2099,57 +2099,6 @@ AC_DEFUN([PHP_PROG_BISON], [
   PHP_SUBST(YACC)
 ])
 
-dnl
-dnl PHP_PROG_LEX
-dnl
-dnl Search for (f)lex and check it's version
-dnl
-AC_DEFUN([PHP_PROG_LEX], [
-dnl we only support certain flex versions
-  flex_version_list="2.5.4"
-
-  AC_PROG_LEX
-  dnl ## Make flex scanners use const if they can, even if __STDC__ is not
-  dnl ## true, for compilers like Sun's that only set __STDC__ true in
-  dnl ## "limit-to-ANSI-standard" mode, not in "ANSI-compatible" mode
-  AC_C_CONST
-  if test "$ac_cv_c_const" = "yes" ; then
-    LEX_CFLAGS="-DYY_USE_CONST"
-  fi
-
-  if test "$LEX" = "flex"; then
-    AC_CACHE_CHECK([for flex version], php_cv_flex_version, [
-      flex_version=`$LEX -V -v --version 2>/dev/null | $SED -e 's/^.* //'`
-      php_cv_flex_version=invalid
-      for flex_check_version in $flex_version_list; do
-        if test "$flex_version" = "$flex_check_version"; then
-          php_cv_flex_version="$flex_check_version (ok)"
-        fi
-      done
-    ])
-  else
-    flex_version=none
-  fi
-
-  case $php_cv_flex_version in
-    ""|invalid[)]
-      if test -f "$abs_srcdir/Zend/zend_language_scanner.c" && test -f "$abs_srcdir/Zend/zend_ini_scanner.c"; then
-        AC_MSG_WARN([flex versions supported for regeneration of the Zend/PHP parsers: $flex_version_list  (found: $flex_version)])
-      else
-        flex_msg="Supported flex versions are: $flex_version_list"
-        if test "$flex_version" = "none"; then
-          flex_msg="flex not found. flex is required to generate the Zend/PHP parsers! $flex_msg"
-        else
-          flex_msg="Found invalid flex version: $flex_version. $flex_msg"
-        fi
-        AC_MSG_ERROR([$flex_msg])
-      fi
-      LEX="exit 0;"
-      ;;
-  esac
-  PHP_SUBST(LEX)
-])
-
 dnl
 dnl PHP_PROG_RE2C
 dnl

build/build2.mk

@@ -27,7 +27,7 @@ targets = $(TOUCH_FILES) configure $(config_h_in)
 PHP_AUTOCONF ?= 'autoconf'
 PHP_AUTOHEADER ?= 'autoheader'
 
-SUPPRESS_WARNINGS ?= 2>&1 | (egrep -v '(AC_TRY_RUN called without default to allow cross compiling|AC_PROG_CXXCPP was called before AC_PROG_CXX|defined in acinclude.m4 but never used|AC_PROG_LEX invoked multiple times|AC_DECL_YYTEXT is expanded from...|the top level)'||true)
+SUPPRESS_WARNINGS ?= 2>&1 | (egrep -v '(AC_TRY_RUN called without default to allow cross compiling|AC_PROG_CXXCPP was called before AC_PROG_CXX|defined in acinclude.m4 but never used)'||true)
 
 all: $(targets)
 

makedist

@@ -85,7 +85,7 @@ for i in $LT_TARGETS; do
   fi
 done
 
-# generate some files so people don't need bison, flex and autoconf
+# generate some files so people don't need bison, re2c and autoconf
 # to install
 set -x
 ./buildconf --copy --force

sapi/phpdbg/phpdbg_parser.c

@@ -76,8 +76,6 @@
 /*
  * phpdbg_parser.y
  * (from php-src root)
- * flex sapi/phpdbg/dev/phpdbg_lexer.l
- * bison sapi/phpdbg/dev/phpdbg_parser.y
  */
 
 #include "phpdbg.h"

sapi/phpdbg/phpdbg_parser.y

@@ -3,8 +3,6 @@
 /*
  * phpdbg_parser.y
  * (from php-src root)
- * flex sapi/phpdbg/dev/phpdbg_lexer.l
- * bison sapi/phpdbg/dev/phpdbg_parser.y
  */
 
 #include "phpdbg.h"