问题描述
我是GNU自动工具的新手，在我的项目中使用lex和yacc解析器.将它们作为源包含在makefile.am中会导致以下错误:
I am new to GNU autotools and in my project lex and yacc parsers are used.Including them as source in makefile.am produes following error :
configure.in:
...
AC_CHECK_PROGS(YACC,bison yacc,none)
if test "x$YACC" = "xbison"; then
YACC="$YACC -y"
fi
AC_CHECK_PROGS(LEX,flex,none)
...
makefile.am:
## $Id
AUTOMAKE_OPTIONS=foreign no-dependencies
include $(srcdir)/Makefile_defs
dynamicpreprocessordir = ${libdir}/snort_dynamicpreprocessor
dynamicpreprocessor_LTLIBRARIES = libsf_appid_preproc.la
libsf_appid_preproc_la_LDFLAGS = -export-dynamic -module @XCCFLAGS@
if SO_WITH_STATIC_LIB
libsf_appid_preproc_la_LIBADD = ../libsf_dynamic_preproc.la
../libsf_dynamic_utils.la $(LUA_LIBS)
else
nodist_libsf_appid_preproc_la_SOURCES = \
../include/sf_dynamic_preproc_lib.c \
../include/sf_ip.c \
../include/sfPolicyUserData.c \
../include/sfxhash.c \
../include/sfghash.c \
../include/sflsq.c \
../include/sfhashfcn.c \
../include/sfmemcap.c \
../include/sfprimetable.c
libsf_appid_preproc_la_LIBADD = $(LUA_LIBS)
endif
libsf_appid_preproc_la_CFLAGS = -DDYNAMIC_PREPROC_CONTEXT -DSTATIC=static $(LUA_CFLAGS)
libsf_appid_preproc_la_SOURCES = $(APPID_SOURCES)
all-local: $(LTLIBRARIES)
$(MAKE) DESTDIR=`pwd`/../build install-dynamicpreprocessorLTLIBRARIES
在Makefile_defs中:
In Makefile_defs :
APPID_SRC_DIR = ${top_srcdir}/src/dynamic-preprocessors/appid
...
APPID_SOURCES = \
$(APPID_SRC_DIR)/vfml/fc45.lex \
$(APPID_SRC_DIR)/vfml/fc45.y \
...
当我运行程序时，出现以下错误:
when i run the program i get following error :
libsf_appid_preproc.so: undefined symbol: FC45SetFile
fc45.lex文件中已经定义了FC45SetFile().
While FC45SetFile() is already defined in fc45.lex file.
fc45.lex:
%{
#include "fc45.tab.h"
//#include "vfml.h"
#include <string.h>
#include <stdlib.h>
/* HERE doesn't match strings starting with numbers other than 0 right */
char string_buf[4000]; /* BUG - maybe check for strings that are too long? */
char *string_buf_ptr;
void FC45FinishString(void);
extern int gLineNumber;
%}
%x str_rule
%%
<str_rule,INITIAL>\|[^\n]* ;
[\ \t\r]+ ;
\n gLineNumber++;
\. { return '.';}
, { return ',';}
: { return ':';}
ignore { return tIgnore; }
continuous { return tContinuous; }
discrete { return tDiscrete; }
[^:?,\t\n\r\|\.\\\ ] string_buf_ptr = string_buf; unput(yytext[0]); BEGIN(str_rule);
<str_rule>[:,?] FC45FinishString(); unput(yytext[0]); return tString;
<str_rule>\.[\t\r\ ] FC45FinishString(); unput(yytext[1]); unput(yytext[0]); return tString;
<str_rule>\.\n FC45FinishString(); unput(yytext[1]); unput(yytext[0]); return tString; gLineNumber++;
<str_rule><<EOF>> {
int len = strlen(string_buf);
// printf("eof rule.\n");
if(len == 1 && string_buf[0] == '.') {
//printf(" period at end of file\n");
return '.';
} else if(string_buf[len - 1] == '.') {
// printf(" period: %s - unput .\n", string_buf);
FC45FinishString(); unput('.'); return tString;
} else {
// printf(" no-period: %s\n", string_buf);
FC45FinishString(); return tString;
}
}
<str_rule>\\: *string_buf_ptr++ = ':';
<str_rule>\\\? *string_buf_ptr++ = '?';
<str_rule>\\, *string_buf_ptr++ = ',';
<str_rule>\\. *string_buf_ptr++ = '.';
<str_rule>\n *string_buf_ptr++ = ' '; gLineNumber++;
<str_rule>[ \t\r]+ *string_buf_ptr++ = ' ';
<str_rule>[^:?,\t\n\r\|\.\\\ ]+ {
char *yptr = yytext;
while(*yptr) {
*string_buf_ptr++ = *yptr++;
}
}
%%
int fc45wrap(void) {
return 1;
}
void FC45SetFile(FILE *file) {
fc45in = file;
yyrestart(fc45in);
}
void FC45FinishString(void) {
int len;
char *tmpStr;
BEGIN(INITIAL);
*string_buf_ptr = '\0';
len = strlen(string_buf);
/* remove any ending spaces */
while(string_buf[len - 1] == ' ') {
string_buf[len - 1] = '\0';
len--;
}
tmpStr = MNewPtr(len + 1);
strncpy(tmpStr, string_buf, len + 1);
fc45lval.string = tmpStr;
string_buf[0] = '\0';
}
fc45.y:
%{
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include "ExampleSpec1.h"
//#include "AttributeTracker.c"
//#include "vfml.h"
%}
%{
int fc45lex(void);
int fc45error(const char *);
/* HERE figure out how to give better error messages */
/* BUG needs a \n at the end of the names file */
/* These tmps are allocated at the begining of parsing and then
used during parsing. For example, so that we can simply
add terrains to an area while parsing. After parsing a
statement, the associated tmp is added to the appropriate
global list, and a new tmp is allocated. Finally, at the
end of parsing, all the tmps are freed
*/
ExampleSpecPtr exampleSpec;
AttributeSpecPtr attributeSpec;
int gLineNumber;
%}
%union {
int integer;
float f;
char *string;
}
%token <integer> tInteger
%token <string> tString
%token tIgnore tContinuous tDiscrete tEOF
%%
ExampleSpec: ClassList '.' AttributeList;
ClassList: ClassList ',' ClassSpec | ClassSpec /* ending */;
ClassSpec: tString { ExampleSpecAddClass(exampleSpec, $1); };
AttributeList: AttributeList AttributeSpec | /* ending */;
AttributeSpec: tString ':' AttributeInfo '.' {
AttributeSpecSetName(attributeSpec, $1);
ExampleSpecAddAttributeSpec(exampleSpec, attributeSpec);
attributeSpec = AttributeSpecNew();
};
AttributeInfo: tIgnore {
AttributeSpecSetType(attributeSpec, asIgnore);} |
tContinuous {
AttributeSpecSetType(attributeSpec, asContinuous);} |
tDiscrete tString {
AttributeSpecSetType(attributeSpec, asDiscreteNoName);
AttributeSpecSetNumValues(attributeSpec, atoi($2)); } |
AttributeValueNameList {
AttributeSpecSetType(attributeSpec, asDiscreteNamed); };
AttributeValueNameList: AttributeValueNameList ',' tString {
AttributeSpecSetNumValues(attributeSpec,
AttributeSpecGetNumValues(attributeSpec) + 1);
AttributeSpecAddValue(attributeSpec, $3); } |
tString {
AttributeSpecSetNumValues(attributeSpec,
AttributeSpecGetNumValues(attributeSpec) + 1);
AttributeSpecAddValue(attributeSpec, $1); };
%%
void FC45SetFile(FILE *file);
int fc45error(const char *msg) {
fprintf(stderr, "%s line %d\n", msg, gLineNumber);
return 0;
}
ExampleSpecPtr ParseFC45(const char *file) {
FILE *input;
input = fopen(file, "r");
if(input == 0) {
return 0;
}
FC45SetFile(input);
exampleSpec = ExampleSpecNew();
attributeSpec = AttributeSpecNew();
gLineNumber = 0;
if(fc45parse()) {
/* parse failed! */
fprintf(stderr, "Error in parsing: %s\n", file);
}
fclose(input);
/* free the left over attribute spec */
AttributeSpecFree(attributeSpec);
return exampleSpec;
}
我已经在Internet上搜索了解决方案，但无法提出任何解决方案.希望有人认识到问题并对此有快速的解决方案.任何帮助将不胜感激.
I've searched Internet for the solution and was unable to come up with any.Hope someone recognizes the problem and has a quick solution to it. Any help will be appreciated.
推荐答案
我刚通过一个简单示例，其中添加了以下Autotools文件:
I just ran through a simple example, adding the following Autotools files:
configure.ac :
AC_PREREQ([2.69])
AC_INIT([example], [0.1a], [[email protected]])
AC_CONFIG_SRCDIR([ex1.l])
# Used only to shorten the otherwise lengthy compilation line in the output below.
AC_CONFIG_HEADERS([config.h])
AM_INIT_AUTOMAKE([foreign])
# I used C instead of C++.
AC_PROG_CC
AM_PROG_LEX
AC_PROG_YACC
AC_CONFIG_FILES([Makefile])
AC_OUTPUT
Makefile.am (直接取自自动制作手册):
BUILT_SOURCES = ex1.h
AM_YFLAGS = -d
bin_PROGRAMS = ex1
ex1_SOURCES = ex1.l ex1.y
原来，您无法使用相同的基本文件名来命名文件.就我而言，我有 ex1.l 和 ex1.y .当我调用 make 时，使用 ex1_SOURCES = ex1.l ex1.y 会导致以下输出:
It turned out that you can't name the files with the same base file name. In my case, I had ex1.l and ex1.y. Using ex1_SOURCES = ex1.l ex1.y resulted in the following output when I invoked make:
make[1]: Entering directory '/home/kit/ex1'
/bin/bash ./ylwrap ex1.l lex.yy.c ex1.c -- flex
make[1]: Leaving directory '/home/kit/ex1'
make all-am
make[1]: Entering directory '/home/kit/ex1'
gcc -DHAVE_CONFIG_H=1 -I. -g -O2 -MT ex1.o -MD -MP -MF .deps/ex1.Tpo -c -o ex1.o ex1.c
ex1.l:5:17: fatal error: ex1.h: No such file or directory
#include "ex1.h"
^
compilation terminated.
Makefile:378: recipe for target 'ex1.o' failed
make[1]: *** [ex1.o] Error 1
make[1]: Leaving directory '/home/kit/ex1'
Makefile:281: recipe for target 'all' failed
make: *** [all] Error 2
请注意，flex是在第二行中调用的，而bison/yacc不是.什么原因?嗯， ylwrap 脚本是原因:
Note the fact that flex was invoked in the second line, but bison/yacc was not. What's the reason? Well, the ylwrap script is the reason:
ex1.c: ex1.l
ex1.c: ex1.y
由于该脚本将ex1.l的输出从"lex.yy.c"重命名为"ex1.c"，因此makefile认为ex1.c已经构建，因此它对野牛/yacc文件，这意味着ex1.h也不构建.
Because the script renames the output of ex1.l from "lex.yy.c" to "ex1.c", the makefile thinks that ex1.c is already built, so it won't do anything with the bison/yacc file, which means that ex1.h isn't built either.
您不能禁用 ylwrap 脚本，但可以解决该问题:只需重命名flex源文件，然后在Makefile.in和configure.ac文件中将对文件名的引用更改为有必要的.您不需要重命名bison/yacc源文件，因为这意味着将每个 #include"fc45.h" 更改为 #include"fc45_g.h" (或(无论您将文件重命名为)(在每个C文件中以及在您的flex源文件中).
You can't disable the ylwrap script, but you can work around it: simply rename your flex source file and change the references to the file name in your Makefile.in and configure.ac files as necessary. You shouldn't need to rename your bison/yacc source file because that would mean changing every #include "fc45.h" to #include "fc45_g.h" (or whatever you renamed the file to) in every C file as well as your flex source file.
这篇关于在C中的GNU automake中使用解析器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！