Only rebuild bison and flex source files on demand, if bison and flex are detected by the configure script.

Changed after discussion on the -dev list about possible unnecessary build
failures, due to checkouts/untars causing these special source files to
possibly be newer than their resulting C files.  This should additionally
ensure that nobody need learn about extra Makefile arguments to ensure the
proper files get rebuilt when changes are made to these special source files.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@242520 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configure.ac

@@ -142,6 +142,8 @@ fi
 AC_SUBST(GNU_LD)
 
 AC_PATH_PROG([AWK], [awk], :)
+AC_PATH_PROG([BISON], [bison], :)
+AC_PATH_PROG([FLEX], [flex], :)
 AC_PATH_PROG([GREP], [grep], :)
 AC_PATH_PROG([FIND], [find], :)
 AC_PATH_PROG([COMPRESS], [compress], :)

include/asterisk/autoconfig.h.in

@@ -457,7 +457,7 @@
 /* Define to 1 if you have the `strtoq' function. */
 #undef HAVE_STRTOQ
 
-/* Define to 1 if `struct stat' is a member of `st_blksize'. */
+/* Define to 1 if `st_blksize' is member of `struct stat'. */
 #undef HAVE_STRUCT_STAT_ST_BLKSIZE
 
 /* Define to 1 if you have the mISDN Supplemental Services library. */
@@ -646,12 +646,12 @@
 /* Define to the one symbol short name of this package. */
 #undef PACKAGE_TARNAME
 
-/* Define to the home page for this package. */
-#undef PACKAGE_URL
-
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION
 
+/* Define to 1 if the C compiler supports function prototypes. */
+#undef PROTOTYPES
+
 /* Define to necessary symbol if this constant uses a non-standard name on
    your system. */
 #undef PTHREAD_CREATE_JOINABLE
@@ -671,6 +671,11 @@
 /* Define to the type of arg 5 for `select'. */
 #undef SELECT_TYPE_ARG5
 
+/* Define to 1 if the `setvbuf' function takes the buffering type as its
+   second argument and the buffer pointer as the third, as on System V before
+   release 3. */
+#undef SETVBUF_REVERSED
+
 /* The size of `int', as computed by sizeof. */
 #undef SIZEOF_INT
 
@@ -691,30 +696,20 @@
 /* Define to 1 if your <sys/time.h> declares `struct tm'. */
 #undef TM_IN_SYS_TIME
 
-/* Enable extensions on AIX 3, Interix.  */
+/* Define to 1 if on AIX 3.
+   System headers sometimes define this.
+   We just want to avoid a redefinition error message.  */
 #ifndef _ALL_SOURCE
 # undef _ALL_SOURCE
 #endif
+
+/* Number of bits in a file offset, on hosts where this is settable. */
+#undef _FILE_OFFSET_BITS
+
 /* Enable GNU extensions on systems that have them.  */
 #ifndef _GNU_SOURCE
 # undef _GNU_SOURCE
 #endif
-/* Enable threading extensions on Solaris.  */
-#ifndef _POSIX_PTHREAD_SEMANTICS
-# undef _POSIX_PTHREAD_SEMANTICS
-#endif
-/* Enable extensions on HP NonStop.  */
-#ifndef _TANDEM_SOURCE
-# undef _TANDEM_SOURCE
-#endif
-/* Enable general extensions on Solaris.  */
-#ifndef __EXTENSIONS__
-# undef __EXTENSIONS__
-#endif
-
-
-/* Number of bits in a file offset, on hosts where this is settable. */
-#undef _FILE_OFFSET_BITS
 
 /* Define to 1 to make fseeko visible on some hosts (e.g. glibc 2.2). */
 #undef _LARGEFILE_SOURCE
@@ -732,6 +727,20 @@
 /* Define to 1 if you need to in order for `stat' and other things to work. */
 #undef _POSIX_SOURCE
 
+/* Enable extensions on Solaris.  */
+#ifndef __EXTENSIONS__
+# undef __EXTENSIONS__
+#endif
+#ifndef _POSIX_PTHREAD_SEMANTICS
+# undef _POSIX_PTHREAD_SEMANTICS
+#endif
+#ifndef _TANDEM_SOURCE
+# undef _TANDEM_SOURCE
+#endif
+
+/* Define like PROTOTYPES; this can be used by system headers. */
+#undef __PROTOTYPES
+
 /* Define to empty if `const' does not conform to ANSI C. */
 #undef const
 

makeopts.in

@@ -8,6 +8,8 @@ CXX=@CXX@
 
 INSTALL=@INSTALL@
 AWK=@AWK@
+BISON=@BISON@
+FLEX=@FLEX@
 GREP=@GREP@
 AR=@AR@
 RANLIB=@RANLIB@

pbx/Makefile

@@ -9,7 +9,7 @@
 # the GNU General Public License
 #
 
--include ../menuselect.makeopts ../menuselect.makedeps
+-include ../menuselect.makeopts ../menuselect.makedeps ../makeopts
 
 MENUSELECT_CATEGORY=PBX
 MENUSELECT_DESCRIPTION=PBX Modules
@@ -44,14 +44,22 @@ ael/ael.tab.o ael/ael_lex.o: _ASTCFLAGS+=$(MENUSELECT_OPTS_pbx_ael:%=-D%) $(fore
 
 $(if $(filter pbx_ael,$(EMBEDDED_MODS)),modules.link,pbx_ael.so): ael/ael.tab.o ael/ael_lex.o
 
+ifneq ($(FLEX),)
 ael/ael_lex.c: ael/ael.flex
+else
+ael/ael_lex.c:
+endif
 	$(ECHO_PREFIX) echo "   [FLEX] $< -> $@"
-	(cd ael; flex ael.flex; sed -i -e "/begin standard C headers/i#include \"asterisk.h\"" ael_lex.c)
-	(cd ael; sed 's@#if __STDC_VERSION__ >= 199901L@#if !defined __STDC_VERSION__ || __STDC_VERSION__ >= 199901L@' ael_lex.c > zz; mv zz ael_lex.c)
+	$(ECHO_PREFIX) (cd ael; flex ael.flex; sed -i -e "/begin standard C headers/i#include \"asterisk.h\"" ael_lex.c)
+	$(ECHO_PREFIX) (cd ael; sed 's@#if __STDC_VERSION__ >= 199901L@#if !defined __STDC_VERSION__ || __STDC_VERSION__ >= 199901L@' ael_lex.c > zz; mv zz ael_lex.c)
 
+ifneq ($(BISON),)
 ael/ael.tab.c ael/ael.tab.h: ael/ael.y
+else
+ael/ael.tab.c ael/ael.tab.h:
+endif
 	$(ECHO_PREFIX) echo "   [BISON] $< -> $@"
-	(cd ael; bison -v -d ael.y)
+	$(ECHO_PREFIX) (cd ael; bison -v -d ael.y)
 
 dundi-parser.o: dundi-parser.h
 dundi-parser.o: _ASTCFLAGS+=-I.

pbx/ael/ael_lex.c

@@ -55,6 +55,7 @@ typedef int flex_int32_t;
 typedef unsigned char flex_uint8_t; 
 typedef unsigned short int flex_uint16_t;
 typedef unsigned int flex_uint32_t;
+#endif /* ! C99 */
 
 /* Limits of integral types. */
 #ifndef INT8_MIN
@@ -85,8 +86,6 @@ typedef unsigned int flex_uint32_t;
 #define UINT32_MAX             (4294967295U)
 #endif
 
-#endif /* ! C99 */
-
 #endif /* ! FLEXINT_H */
 
 #ifdef __cplusplus
@@ -951,7 +950,7 @@ static void pbcwhere(const char *text, int *line, int *col )
 #define	STORE_POS
 #define	STORE_LOC
 #endif
-#line 954 "ael_lex.c"
+#line 953 "ael_lex.c"
 
 #define INITIAL 0
 #define paren 1
@@ -1103,7 +1102,7 @@ static int input (yyscan_t yyscanner );
 /* This used to be an fputs(), but since the string might contain NUL's,
  * we now use fwrite().
  */
-#define ECHO do { if (fwrite( yytext, yyleng, 1, yyout )) {} } while (0)
+#define ECHO fwrite( yytext, yyleng, 1, yyout )
 #endif
 
 /* Gets input and stuffs it into "buf".  number of characters read, or YY_NULL,
@@ -1114,7 +1113,7 @@ static int input (yyscan_t yyscanner );
 	if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \
 		{ \
 		int c = '*'; \
-		size_t n; \
+		int n; \
 		for ( n = 0; n < max_size && \
 			     (c = getc( yyin )) != EOF && c != '\n'; ++n ) \
 			buf[n] = (char) c; \
@@ -1202,7 +1201,7 @@ YY_DECL
 #line 216 "ael.flex"
 
 
-#line 1205 "ael_lex.c"
+#line 1204 "ael_lex.c"
 
     yylval = yylval_param;
 
@@ -2028,7 +2027,7 @@ YY_RULE_SETUP
 #line 649 "ael.flex"
 YY_FATAL_ERROR( "flex scanner jammed" );
 	YY_BREAK
-#line 2031 "ael_lex.c"
+#line 2030 "ael_lex.c"
 
 	case YY_END_OF_BUFFER:
 		{