Buildfehler mit Flex-Lexer und cmake

Question

ich lerne cmake und flex-Lexer aber ich bekomme ein Build-Problem mit Fehlercode 2 gemäß der Fehlermeldung aus machen:

$ make 
/usr/bin/cmake -H/home/dac/ClionProjects/openshell -B/home/dac/ClionProjects/openshell --check-build-system CMakeFiles/Makefile.cmake 0 
/usr/bin/cmake -E cmake_progress_start /home/dac/ClionProjects/openshell/CMakeFiles /home/dac/ClionProjects/openshell/CMakeFiles/progress.marks 
make -f CMakeFiles/Makefile2 all 
make[1]: Entering directory '/home/dac/ClionProjects/openshell' 
make -f CMakeFiles/lemon.dir/build.make CMakeFiles/lemon.dir/depend 
make[2]: Entering directory '/home/dac/ClionProjects/openshell' 
cd /home/dac/ClionProjects/openshell && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/dac/ClionProjects/openshell /home/dac/ClionProjects/openshell /home/dac/ClionProjects/openshell /home/dac/ClionProjects/openshell /home/dac/ClionProjects/openshell/CMakeFiles/lemon.dir/DependInfo.cmake --color= 
make[2]: Leaving directory '/home/dac/ClionProjects/openshell' 
make -f CMakeFiles/lemon.dir/build.make CMakeFiles/lemon.dir/build 
make[2]: Entering directory '/home/dac/ClionProjects/openshell' 
make[2]: Nothing to be done for 'CMakeFiles/lemon.dir/build'. 
make[2]: Leaving directory '/home/dac/ClionProjects/openshell' 
/usr/bin/cmake -E cmake_progress_report /home/dac/ClionProjects/openshell/CMakeFiles 1 
[ 14%] Built target lemon 
make -f CMakeFiles/openshell.dir/build.make CMakeFiles/openshell.dir/depend 
make[2]: Entering directory '/home/dac/ClionProjects/openshell' 
/usr/bin/cmake -E cmake_progress_report /home/dac/ClionProjects/openshell/CMakeFiles 2 
[ 28%] [FLEX][openshell] Building scanner with flex 2.5.39 
/usr/bin/flex -oshellparser.c shellscanner.l 
cd /home/dac/ClionProjects/openshell && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/dac/ClionProjects/openshell /home/dac/ClionProjects/openshell /home/dac/ClionProjects/openshell /home/dac/ClionProjects/openshell /home/dac/ClionProjects/openshell/CMakeFiles/openshell.dir/DependInfo.cmake --color= 
Scanning dependencies of target openshell 
make[2]: Leaving directory '/home/dac/ClionProjects/openshell' 
make -f CMakeFiles/openshell.dir/build.make CMakeFiles/openshell.dir/build 
make[2]: Entering directory '/home/dac/ClionProjects/openshell' 
/usr/bin/cmake -E cmake_progress_report /home/dac/ClionProjects/openshell/CMakeFiles 3 
[ 42%] Building C object CMakeFiles/openshell.dir/shellparser.c.o 
/usr/bin/cc -Wall -Werror -O3 -std=c99 -I/usr/include/readline -o CMakeFiles/openshell.dir/shellparser.c.o -c /home/dac/ClionProjects/openshell/shellparser.c 
shellparser.c: In function ‘yy_init_buffer’: 
shellparser.c:1432:48: error: implicit declaration of function ‘fileno’ [-Werror=implicit-function-declaration] 
     b->yy_is_interactive = file ? (isatty(fileno(file)) > 0) : 0; 
               ^
shellscanner.l: At top level: 
shellparser.c:1181:17: error: ‘yyunput’ defined but not used [-Werror=unused-function] 
    static void yyunput (int c, register char * yy_bp , yyscan_t yyscanner) 
       ^
shellparser.c:1223:16: error: ‘input’ defined but not used [-Werror=unused-function] 
    static int input (yyscan_t yyscanner) 
       ^
cc1: all warnings being treated as errors 
CMakeFiles/openshell.dir/build.make:62: recipe for target 'CMakeFiles/openshell.dir/shellparser.c.o' failed 
make[2]: *** [CMakeFiles/openshell.dir/shellparser.c.o] Error 1 
make[2]: Leaving directory '/home/dac/ClionProjects/openshell' 
CMakeFiles/Makefile2:98: recipe for target 'CMakeFiles/openshell.dir/all' failed 
make[1]: *** [CMakeFiles/openshell.dir/all] Error 2 
make[1]: Leaving directory '/home/dac/ClionProjects/openshell' 
Makefile:78: recipe for target 'all' failed 
make: *** [all] Error 2 

Meine Build-Datei ist

cmake_minimum_required(VERSION 3.0) 

project(openshell) 
find_package(FLEX) 

FLEX_TARGET(openshell shellscanner.l shellparser.c) 


add_executable(openshell shellparser.c ${FLEX_ShellScanner_OUTPUTS} main.c openshell.h errors.c errors.h util.c util.h stack.c stack.h shellscanner.l shellscanner.h) 


set(CMAKE_VERBOSE_MAKEFILE on) 
include_directories(/usr/include/readline) 

#### Lemon bootstrap #### 
ADD_EXECUTABLE(lemon lemon.c) 

file(GLOB SOURCES "./*.c") 
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Werror -O3 -std=c99") 

target_link_libraries(openshell ${READLINE_LIBRARY} ${FLEX_LIBRARIES}) 

Ist es die Compiler-Optionen, die ich ändern muss? Meine Dateistruktur ist:

$ tree 
. 
├── CMakeCache.txt 
├── CMakeFiles 
│   ├── 3.2.2 
│   │   ├── CMakeCCompiler.cmake 
│   │   ├── CMakeCXXCompiler.cmake 
│   │   ├── CMakeDetermineCompilerABI_C.bin 
│   │   ├── CMakeDetermineCompilerABI_CXX.bin 
│   │   ├── CMakeSystem.cmake 
│   │   ├── CompilerIdC 
│   │   │   ├── a.out 
│   │   │   └── CMakeCCompilerId.c 
│   │   └── CompilerIdCXX 
│   │    ├── a.out 
│   │    └── CMakeCXXCompilerId.cpp 
│   ├── cmake.check_cache 
│   ├── CMakeDirectoryInformation.cmake 
│   ├── CMakeOutput.log 
│   ├── CMakeRuleHashes.txt 
│   ├── CMakeTmp 
│   ├── feature_tests.bin 
│   ├── feature_tests.c 
│   ├── feature_tests.cxx 
│   ├── lemon.dir 
│   │   ├── build.make 
│   │   ├── C.includecache 
│   │   ├── cmake_clean.cmake 
│   │   ├── DependInfo.cmake 
│   │   ├── depend.internal 
│   │   ├── depend.make 
│   │   ├── flags.make 
│   │   ├── lemon.c.o 
│   │   ├── link.txt 
│   │   └── progress.make 
│   ├── Makefile2 
│   ├── Makefile.cmake 
│   ├── openshell.dir 
│   │   ├── build.make 
│   │   ├── C.includecache 
│   │   ├── cmake_clean.cmake 
│   │   ├── DependInfo.cmake 
│   │   ├── depend.internal 
│   │   ├── depend.make 
│   │   ├── flags.make 
│   │   ├── flex 
│   │   │   ├── lemon.c.o 
│   │   │   └── shellparser.c.o 
│   │   ├── lemon.c.o 
│   │   ├── link.txt 
│   │   ├── progress.make 
│   │   ├── stack.c.o 
│   │   └── util.c.o 
│   ├── parser.dir 
│   │   ├── build.make 
│   │   ├── cmake_clean.cmake 
│   │   ├── DependInfo.cmake 
│   │   ├── depend.internal 
│   │   ├── depend.make 
│   │   └── progress.make 
│   ├── Progress 
│   │   ├── 1 
│   │   ├── 2 
│   │   ├── 3 
│   │   └── count.txt 
│   ├── progress.marks 
│   └── TargetDirectories.txt 
├── cmake_install.cmake 
├── CMakeLists.txt 
├── digenv.c 
├── errors.c 
├── errors.h 
├── example.c 
├── example.h 
├── flex 
│   ├── digenv.c 
│   ├── errors.c 
│   ├── errors.h 
│   ├── example.c 
│   ├── example.h 
│   ├── lemon 
│   ├── lemon.c 
│   ├── lempar.c 
│   ├── lex.yy.c 
│   ├── main.c 
│   ├── main.c~ 
│   ├── main.h 
│   ├── main.o 
│   ├── Makefile 
│   ├── Makefile~ 
│   ├── miniShell2.c 
│   ├── openshell 
│   ├── openshell.c 
│   ├── openshell.h 
│   ├── openshell.l 
│   ├── pipeline.c 
│   ├── README.md 
│   ├── shell 
│   ├── shellparser.c 
│   ├── shellparser.h 
│   ├── shellparser.hpp 
│   ├── shellparser.o 
│   ├── shellparser.out 
│   ├── shellparser.y 
│   ├── shellparser.y~ 
│   ├── shellscanner.h 
│   ├── shellscanner.l 
│   ├── shellscanner.o 
│   ├── snazzle 
│   ├── util.c 
│   └── util.h 
├── lemon 
├── lemon.c 
├── lempar.c 
├── lex.yy.c 
├── main.c 
├── main.h 
├── main.o 
├── Makefile 
├── miniShell2.c 
├── openshell 
├── openshell.c 
├── openshell.h 
├── pipeline.c 
├── README.md 
├── shellparser.c 
├── shellparser.h 
├── shellparser.hpp 
├── shellparser.o 
├── shellparser.out 
├── shellparser.y 
├── shellscanner.h 
├── shellscanner.l 
├── shellscanner.o 
├── snazzle 
├── snazzle.l~ 
├── stack.c 
├── stack.h 
├── util.c 
└── util.h 

11 directories, 127 files 
dac@dac-Latitude-E7450:~/ClionProjects/openshell$ 

Meine flex Grammatik ist

%include { 
#include <stdio.h> 
#include <assert.h> 
} 

%token_type {const char*} 

%syntax_error 
{ 
    fprintf(stderr, "Error parsing command\n"); 
} 

start ::= in . 
in ::= . 
in ::= in commandList EOL . 
{ 
    printf("in ::= in commandList EOL .\n"); 
    printf("> "); 
} 

commandList ::= command PIPE commandList . 
{ 
    printf("commandList ::= command PIPE commandList .\n"); 
} 
commandList ::= command . 
{ 
    printf("commandList ::= command .\n"); 
} 

command ::= FILENAME argumentList . 
{ 
    printf("command ::= FILENAME argumentList .\n"); 
} 
command ::= FILENAME . 
{ 
    printf("command ::= FILENAME .\n"); 
} 

argumentList ::= argument argumentList . 
{ 
    printf("argumentList ::= argument argumentList .\n"); 
} 
argumentList ::= argument . 
{ 
    printf("argumentList ::= argument .\n"); 
} 
argument ::= ARGUMENT . 
{ 
    printf("argument ::= ARGUMENT .\n"); 
} 
argument ::= FILENAME . 
{ 
    printf("argument ::= FILENAME .\n"); 
} 

Answer 1

Die Kombination -Wall und -Werror in Ihren Compilerflags ist zu streng für den von flex generierten Code. Sie können den Compiler sagen die spezifischen Fehler als reguläre Warnungen zu behandeln, indem ein paar weitere Optionen hinzu:

-Wno-error=implicit-function-declaration 
-Wno-error=unused-function 

Im Grunde nur no- in die -Werror= Diagnose der Compiler gedruckt einsetzen.

Best Practice wäre, nur diese Compiler-Optionen den spezifischen Quelldateien hinzuzufügen, die von flex generiert wurden, nicht Ihr gesamtes Projekt. In Ihrem Fall könnte es so aussehen:

set_source_files_properties(shellparser.c PROPERTIES COMPILE_FLAGS 
    -Wno-error=implicit-function-declaration 
    -Wno-error=unused-function 
) 

Oder wenn Sie die Warnungen vollständig für diese Datei vermeiden möchten, die vielleicht eine gute Idee sein, so dass Sie zu tolerieren Warnungen nicht gewöhnen:

set_source_files_properties(shellparser.c PROPERTIES COMPILE_FLAGS 
    -Wno-implicit-function-declaration 
    -Wno-unused-function 
) 

Schließlich können Sie tatsächlich in der Lage sein, die nicht angemeldete fileno Problem zu beheben, indem diese an der Spitze Ihrer flex Grammatikdatei hinzufügen:

%{ 
#include <stdio.h> 
%} 

Answer 2

Mit Compiler-Flag -Werror alle Warnungen als Fehler behandelt werden. Sie müssen dieses Flag löschen und die Kompilierung wird ohne Fehler beendet.