[libc][musl] support arm-linux-musleabi toolchain

目前基本功能已经可以在QEMU上跑起来，但是pthread和内核signal选中会报冲突。先合并一版本，后续解决这些问题。

11 files changed, 247 insertions, 126 deletions

diff --git a/bsp/qemu-vexpress-a9/rtconfig.py b/bsp/qemu-vexpress-a9/rtconfig.py
index ebaa1409a6..bc18bdd8dd 100644
--- a/bsp/qemu-vexpress-a9/rtconfig.py
+++ b/bsp/qemu-vexpress-a9/rtconfig.py
@@ -1,8 +1,8 @@
 import os
 
 import uuid
-def get_mac_address(): 
-    mac=uuid.UUID(int = uuid.getnode()).hex[-12:] 
+def get_mac_address():
+    mac=uuid.UUID(int = uuid.getnode()).hex[-12:]
     return "#define AUTOMAC".join([str(int(e/2) + 1) + '  0x' + mac[e:e+2] + '\n' for e in range(5,11,2)])
 
 header = '''
@@ -26,56 +26,45 @@ with open(automac_h_fn, 'w') as f:
     f.write(header + get_mac_address() + end)
 
 # toolchains options
-ARCH='arm'
-CPU='cortex-a'
-CROSS_TOOL='gcc'
-
-if os.getenv('RTT_CC'):
-    CROSS_TOOL = os.getenv('RTT_CC')
-
-# only support GNU GCC compiler.
+ARCH        ='arm'
+CPU         ='cortex-a'
+CROSS_TOOL  = 'gcc'
 PLATFORM    = 'gcc'
-EXEC_PATH   = r'/usr/bin'
-
-if os.getenv('RTT_EXEC_PATH'):
-    EXEC_PATH = os.getenv('RTT_EXEC_PATH')
-
-BUILD = 'debug'
+EXEC_PATH   = os.getenv('RTT_EXEC_PATH') or r'/usr/bin'
+BUILD       = 'debug'
 
 if PLATFORM == 'gcc':
     # toolchains
-    PREFIX = 'arm-none-eabi-'
-    CC = PREFIX + 'gcc'
-    CXX = PREFIX + 'g++'
-    AS = PREFIX + 'gcc'
-    AR = PREFIX + 'ar'
-    LINK = PREFIX + 'gcc'
+    PREFIX  = os.getenv('RTT_CC_PREFIX') or 'arm-none-eabi-'
+    CC      = PREFIX + 'gcc'
+    CXX     = PREFIX + 'g++'
+    AS      = PREFIX + 'gcc'
+    AR      = PREFIX + 'ar'
+    LINK    = PREFIX + 'gcc'
     TARGET_EXT = 'elf'
-    SIZE = PREFIX + 'size'
+    SIZE    = PREFIX + 'size'
     OBJDUMP = PREFIX + 'objdump'
-    OBJCPY = PREFIX + 'objcopy'
-    STRIP = PREFIX + 'strip'
+    OBJCPY  = PREFIX + 'objcopy'
+    STRIP   = PREFIX + 'strip'
+    CFPFLAGS = ' -msoft-float'
+    AFPFLAGS = ' -mfloat-abi=softfp -mfpu=neon'
+    DEVICE   = ' -march=armv7-a -mtune=cortex-a7 -ftree-vectorize -ffast-math -funwind-tables -fno-strict-aliasing'
 
-    DEVICE = ' -march=armv7-a -marm -msoft-float'
-    CFLAGS = DEVICE + ' -Wall -Werror'
-    AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp -D__ASSEMBLY__ -I.'
-    LINK_SCRIPT = 'link.lds'
-    LFLAGS = DEVICE + ' -nostartfiles -Wl,--gc-sections,-Map=rtthread.map,-cref,-u,system_vectors'+\
-                      ' -T %s' % LINK_SCRIPT
-
-    CPATH = ''
-    LPATH = ''
-
-    # generate debug info in all cases
-    AFLAGS += ' -gdwarf-2'
-    CFLAGS += ' -g -gdwarf-2'
+    CXXFLAGS= DEVICE + CFPFLAGS + ' -Wall'
+    CFLAGS  = DEVICE + CFPFLAGS + ' -Wall -std=gnu99'
+    AFLAGS  = DEVICE + ' -c' + AFPFLAGS + ' -x assembler-with-cpp'
+    LFLAGS  = DEVICE + ' -Wl,--gc-sections,-Map=rtthread.map,-cref,-u,system_vectors -T link.lds' + ' -lsupc++ -lgcc -static'
+    CPATH   = ''
+    LPATH   = ''
 
     if BUILD == 'debug':
-        CFLAGS += ' -O0'
+        CFLAGS   += ' -O0 -gdwarf-2'
+        CXXFLAGS += ' -O0 -gdwarf-2'
+        AFLAGS   += ' -gdwarf-2'
     else:
-        CFLAGS += ' -O2'
-
-    CXXFLAGS = CFLAGS + ' -Woverloaded-virtual -fno-exceptions -fno-rtti'
+        CFLAGS   += ' -Os'
+        CXXFLAGS += ' -Os'
+    CXXFLAGS += ' -Woverloaded-virtual -fno-exceptions -fno-rtti'
 
     M_CFLAGS = CFLAGS + ' -mlong-calls -fPIC '
     M_CXXFLAGS = CXXFLAGS + ' -mlong-calls -fPIC'
@@ -83,5 +72,6 @@ if PLATFORM == 'gcc':
                                     ' -shared -fPIC -nostartfiles -nostdlib -static-libgcc'
     M_POST_ACTION = STRIP + ' -R .hash $TARGET\n' + SIZE + ' $TARGET \n'
 
+    DUMP_ACTION = OBJDUMP + ' -D -S $TARGET > rtt.asm\n'
     POST_ACTION = OBJCPY + ' -O binary $TARGET rtthread.bin\n' +\
                   SIZE + ' $TARGET \n'
diff --git a/components/dfs/src/dfs_posix.c b/components/dfs/src/dfs_posix.c
index c406dd5fdb..ed0647121d 100644
--- a/components/dfs/src/dfs_posix.c
+++ b/components/dfs/src/dfs_posix.c
@@ -762,7 +762,7 @@ RTM_EXPORT(telldir);
  * @param d the directory stream.
  * @param offset the offset in directory stream.
  */
-void seekdir(DIR *d, off_t offset)
+void seekdir(DIR *d, long offset)
 {
     struct dfs_fd *fd;
 
diff --git a/components/libc/compilers/common/include/sys/select.h b/components/libc/compilers/common/include/sys/select.h
index 9004658be9..32ce39c287 100644
--- a/components/libc/compilers/common/include/sys/select.h
+++ b/components/libc/compilers/common/include/sys/select.h
@@ -12,7 +12,7 @@
 #ifndef __SYS_SELECT_H__
 #define __SYS_SELECT_H__
 
-#include <rtthread.h>
+#include <rtconfig.h>
 #include <sys/types.h>
 #include <sys/time.h>
 
diff --git a/components/libc/compilers/common/include/sys/signal.h b/components/libc/compilers/common/include/sys/signal.h
index dbd947acb9..b92276ecb1 100644
--- a/components/libc/compilers/common/include/sys/signal.h
+++ b/components/libc/compilers/common/include/sys/signal.h
@@ -14,12 +14,11 @@
 
 #ifdef __cplusplus
 extern "C" {
-#endif
+#endif /* __cplusplus */
 
 #include <stdint.h>
 #include <sys/types.h>
 
-
 /* sigev_notify values
    NOTE: P1003.1c/D10, p. 34 adds SIGEV_THREAD.  */
 
@@ -54,7 +53,6 @@ struct siginfo
 {
     uint16_t si_signo;
     uint16_t si_code;
-
     union sigval si_value;
 };
 typedef struct siginfo siginfo_t;
@@ -216,17 +214,16 @@ int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact)
 #define SIGUSR2 31  /* user defined signal 2 */
 #define NSIG    32      /* signal 0 implied */
 
-#ifndef _SIGNAL_H_
+#if defined(RT_USING_NEWLIBC)
 /* Some applications take advantage of the fact that <sys/signal.h>
  * and <signal.h> are equivalent in glibc.  Allow for that here.  */
 #include <signal.h>
-#endif
-
-#endif
+#endif /* defined(RT_USING_NEWLIBC) */
+#endif /* __ARMCC_VERSION */
 
 #ifdef __cplusplus
 }
-#endif
+#endif /* __cplusplus */
 
-#endif
+#endif /* __SYS_SIGNAL_H__ */
 
diff --git a/components/libc/compilers/common/include/sys/time.h b/components/libc/compilers/common/include/sys/time.h
index 346320bff0..e3bf3ee4ef 100644
--- a/components/libc/compilers/common/include/sys/time.h
+++ b/components/libc/compilers/common/include/sys/time.h
@@ -22,7 +22,7 @@ typedef __time64_t time_t;
 
 #ifdef __cplusplus
 extern "C" {
-#endif
+#endif /* __cplusplus */
 
 #undef CLOCKS_PER_SEC
 #define CLOCKS_PER_SEC RT_TICK_PER_SECOND
@@ -79,22 +79,21 @@ int stime(const time_t *t);
 time_t timegm(struct tm * const t);
 int gettimeofday(struct timeval *tv, struct timezone *tz);
 int settimeofday(const struct timeval *tv, const struct timezone *tz);
-#if defined(__ARMCC_VERSION) || defined (__ICCARM__)
+
+#if defined(__ARMCC_VERSION) || defined (__ICCARM__) || defined(_WIN32)
 struct tm *gmtime_r(const time_t *timep, struct tm *r);
-struct tm* localtime_r(const time_t* t, struct tm* r);
 char* asctime_r(const struct tm *t, char *buf);
 char *ctime_r(const time_t * tim_p, char * result);
-#elif defined(_WIN32)
-struct tm* gmtime_r(const time_t* timep, struct tm* r);
-struct tm* gmtime(const time_t* t);
 struct tm* localtime_r(const time_t* t, struct tm* r);
+#endif /* defined(__ARMCC_VERSION) || defined (__ICCARM__) || defined(_WIN32) */
+
+#ifdef _WIN32
+struct tm* gmtime(const time_t* t);
 struct tm* localtime(const time_t* t);
 time_t mktime(struct tm* const t);
-char* asctime_r(const struct tm* t, char* buf);
-char* ctime_r(const time_t* tim_p, char* result);
 char* ctime(const time_t* tim_p);
 time_t time(time_t* t);
-#endif
+#endif /* _WIN32 */
 
 #ifdef RT_USING_POSIX_DELAY
 int nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
@@ -112,20 +111,21 @@ int nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
 
 #ifndef CLOCK_REALTIME
 #define CLOCK_REALTIME      1
-#endif
+#endif /* CLOCK_REALTIME */
 
 #define CLOCK_CPUTIME_ID    2
 
 #ifndef CLOCK_PROCESS_CPUTIME_ID
 #define CLOCK_PROCESS_CPUTIME_ID CLOCK_CPUTIME_ID
-#endif
+#endif /* CLOCK_PROCESS_CPUTIME_ID */
+
 #ifndef CLOCK_THREAD_CPUTIME_ID
 #define CLOCK_THREAD_CPUTIME_ID  CLOCK_CPUTIME_ID
-#endif
+#endif /* CLOCK_THREAD_CPUTIME_ID */
 
 #ifndef CLOCK_MONOTONIC
 #define CLOCK_MONOTONIC     4
-#endif
+#endif /* CLOCK_MONOTONIC */
 #endif /* defined(RT_USING_POSIX_CLOCK) || defined (RT_USING_POSIX_TIMER) */
 
 #ifdef RT_USING_POSIX_CLOCK
@@ -142,8 +142,7 @@ int timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid);
 int timer_delete(timer_t timerid);
 int timer_getoverrun(timer_t timerid);
 int timer_gettime(timer_t timerid, struct itimerspec *its);
-int timer_settime(timer_t timerid, int flags, const struct itimerspec *value,
-                  struct itimerspec *ovalue);
+int timer_settime(timer_t timerid, int flags, const struct itimerspec *value, struct itimerspec *ovalue);
 #endif /* RT_USING_POSIX_TIMER */
 
 /* timezone */
@@ -153,6 +152,6 @@ int8_t tz_is_dst(void);
 
 #ifdef __cplusplus
 }
-#endif
+#endif /* __cplusplus */
 
 #endif /* _SYS_TIME_H_ */
diff --git a/components/libc/compilers/musl/SConscript b/components/libc/compilers/musl/SConscript
new file mode 100644
index 0000000000..9bc5696157
--- /dev/null
+++ b/components/libc/compilers/musl/SConscript
@@ -0,0 +1,30 @@
+import os
+from building import *
+from gcc import *
+Import('rtconfig')
+
+group = []
+
+libc_name, libc_version = GetGCCLibcNameVersion(rtconfig)
+
+if libc_name == 'musl':
+    print('Musl version: ' + libc_version)
+
+    cwd = GetCurrentDir()
+    src = Glob('*.c')
+
+    CPPPATH = [cwd]
+    CPPDEFINES = ['RT_USING_MUSLLIBC', 'RT_USING_LIBC']
+    LIBS = ['c', 'gcc']
+    LINKFLAGS = ' --specs=kernel.specs'
+    AddDepend(['RT_USING_MUSLLIBC', 'RT_USING_LIBC'])
+
+    group = group + DefineGroup('Compiler', src, depend = [''], CPPPATH = CPPPATH, LINKFLAGS = LINKFLAGS, CPPDEFINES = CPPDEFINES, LIBS = LIBS)
+
+    list = os.listdir(cwd)
+    for d in list:
+        path = os.path.join(cwd, d)
+        if os.path.isfile(os.path.join(path, 'SConscript')):
+            group = group + SConscript(os.path.join(d, 'SConscript'))
+
+Return('group')
diff --git a/components/libc/compilers/musl/syscalls.c b/components/libc/compilers/musl/syscalls.c
new file mode 100644
index 0000000000..6d412cc0a1
--- /dev/null
+++ b/components/libc/compilers/musl/syscalls.c
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-11-18     Meco Man     first version
+ */
+
+#include <rtthread.h>
+
+int *__errno_location(void)
+{
+    return _rt_errno();
+}
+int *___errno_location(void)
+{
+    return _rt_errno();
+}
diff --git a/components/libc/compilers/newlib/SConscript b/components/libc/compilers/newlib/SConscript
index dd8966d5bd..14d3f737f5 100644
--- a/components/libc/compilers/newlib/SConscript
+++ b/components/libc/compilers/newlib/SConscript
@@ -3,28 +3,27 @@ from building import *
 from gcc import *
 Import('rtconfig')
 
-src = []
-cwd = GetCurrentDir()
 group = []
-LIBS = []
-CPPPATH = [cwd]
 
-if rtconfig.PLATFORM in ['gcc']:
-    LIBS += ['c', 'm'] # link libc and libm
-    src += Glob('*.c')
+libc_name, libc_version = GetGCCLibcNameVersion(rtconfig)
 
-    #report newlib version
-    print('Newlib version:' + GetNewLibVersion(rtconfig))
+if libc_name == 'newlib':
+    print('Newlib version: ' + libc_version)
 
-    # identify this is Newlib, and only enable POSIX.1-1990
-    CPPDEFINES = ['RT_USING_NEWLIBC', 'RT_USING_LIBC', '_POSIX_C_SOURCE=1']
+    cwd = GetCurrentDir()
+    src = Glob('*.c')
+
+    CPPPATH = [cwd]
+    CPPDEFINES = ['RT_USING_NEWLIBC', 'RT_USING_LIBC', '_POSIX_C_SOURCE=1'] # identify this is Newlib, and only enable POSIX.1-1990
+    LIBS = ['c', 'm'] # link libc and libm
     AddDepend(['RT_USING_NEWLIBC', 'RT_USING_LIBC'])
-    group = DefineGroup('Compiler', src, depend = [''], CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES, LIBS = LIBS)
 
-list = os.listdir(cwd)
-for d in list:
-    path = os.path.join(cwd, d)
-    if os.path.isfile(os.path.join(path, 'SConscript')):
-        group = group + SConscript(os.path.join(d, 'SConscript'))
+    group = group + DefineGroup('Compiler', src, depend = [''], CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES, LIBS = LIBS)
+
+    list = os.listdir(cwd)
+    for d in list:
+        path = os.path.join(cwd, d)
+        if os.path.isfile(os.path.join(path, 'SConscript')):
+            group = group + SConscript(os.path.join(d, 'SConscript'))
 
 Return('group')
diff --git a/components/libc/posix/io/stdio/libc.c b/components/libc/posix/io/stdio/libc.c
index aa33b25d11..3c4e9d6e0b 100644
--- a/components/libc/posix/io/stdio/libc.c
+++ b/components/libc/posix/io/stdio/libc.c
@@ -18,6 +18,8 @@
 #include <sys/errno.h>
 #include "libc.h"
 
+#define STDIO_DEVICE_NAME_MAX   32
+
 int libc_system_init(void)
 {
 #ifdef RT_USING_POSIX_STDIO
@@ -34,7 +36,7 @@ int libc_system_init(void)
 INIT_COMPONENT_EXPORT(libc_system_init);
 
 #if defined(RT_USING_POSIX_STDIO) && defined(RT_USING_NEWLIBC)
-#define STDIO_DEVICE_NAME_MAX   32
+
 static FILE* std_console = NULL;
 int libc_stdio_set_console(const char* device_name, int mode)
 {
@@ -42,7 +44,7 @@ int libc_stdio_set_console(const char* device_name, int mode)
     char name[STDIO_DEVICE_NAME_MAX];
     char *file_mode;
 
-    snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
+    rt_snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
     name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
 
     if (mode == O_RDWR)
@@ -107,15 +109,71 @@ int libc_stdio_get_console(void)
         return -1;
 }
 
+#elif defined(RT_USING_POSIX_STDIO) && defined(RT_USING_MUSLLIBC)
+
+static FILE* std_console = NULL;
+int sys_dup2(int oldfd, int new);
+
+int libc_stdio_set_console(const char* device_name, int mode)
+{
+    FILE *fp;
+    char name[STDIO_DEVICE_NAME_MAX];
+    char *file_mode;
+
+    rt_snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
+    name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
+
+    if (mode == O_RDWR) file_mode = "r+";
+    else if (mode == O_WRONLY) file_mode = "wb";
+    else file_mode = "rb";
+
+    fp = fopen(name, file_mode);
+    if (fp)
+    {
+        setvbuf(fp, NULL, _IONBF, 0);
+
+        if (std_console)
+        {
+            fclose(std_console);
+            std_console = NULL;
+        }
+        std_console = fp;
+    }
+
+    if (std_console)
+    {
+        int fd = fileno(std_console);
+
+        // /* set fd (0, 1, 2) */
+        // sys_dup2(fd, 0);
+        // sys_dup2(fd, 1);
+        // sys_dup2(fd, 2);
+        return fd;
+    }
+
+    return -1;
+}
+
+int libc_stdio_get_console(void)
+{
+    int ret = -1;
+    if (std_console)
+    {
+        ret = fileno(std_console);
+    }
+
+    return ret;
+}
+
 #elif defined(RT_USING_POSIX_STDIO)
-#define STDIO_DEVICE_NAME_MAX   32
+
 static int std_fd = -1;
 int libc_stdio_set_console(const char* device_name, int mode)
 {
     int fd;
     char name[STDIO_DEVICE_NAME_MAX];
 
-    snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
+    rt_snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
     name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
 
     fd = open(name, mode, 0);
diff --git a/include/rtdef.h b/include/rtdef.h
index 183d80a154..8f2f39f701 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -550,8 +550,9 @@ typedef struct rt_timer *rt_timer_t;
 #ifdef RT_USING_SIGNALS
 #include <sys/signal.h>
 typedef unsigned long rt_sigset_t;
-typedef void (*rt_sighandler_t)(int signo);
 typedef siginfo_t rt_siginfo_t;
+typedef void (*rt_sighandler_t)(int signo);
+
 
 #define RT_SIG_MAX          32
 #endif /* RT_USING_SIGNALS */
diff --git a/tools/gcc.py b/tools/gcc.py
index 1b31d5d549..78f0b7afc5 100644
--- a/tools/gcc.py
+++ b/tools/gcc.py
@@ -69,7 +69,6 @@ def CheckHeader(rtconfig, filename):
 def GetNewLibVersion(rtconfig):
     version = 'unknown'
     root = GetGCCRoot(rtconfig)
-
     if CheckHeader(rtconfig, '_newlib_version.h'): # get version from _newlib_version.h file
         f = open(os.path.join(root, 'include', '_newlib_version.h'), 'r')
         if f:
@@ -86,6 +85,33 @@ def GetNewLibVersion(rtconfig):
             f.close()
     return version
 
+# FIXME: it's not very good
+def CheckMUSLLibc(rtconfig):
+    if 'musl' in rtconfig.PREFIX:
+        return True
+    return False
+
+# FIXME: there is no musl version or musl macros can be found officially
+def GetMuslVersion(rtconfig):
+    version = 'unknown'
+    # root = GetGCCRoot(rtconfig)
+    # print(root)
+    return version
+
+# return libc name and version
+def GetGCCLibcNameVersion(rtconfig):
+    if rtconfig.PLATFORM != 'gcc':
+        return ('unknown', 'unknown')
+
+    newlib_version = GetNewLibVersion(rtconfig)
+    if newlib_version != 'unknown':
+        return ('newlib', newlib_version) # libc: newlib, version: newlib_version
+    elif CheckMUSLLibc(rtconfig) == True:
+        GetMuslVersion(rtconfig)
+        return ('musl', 'unknown') #libc: musl, version: unknown
+    else:
+        return ('unknown', 'unknown') # libc: unknown, version: unknown
+
 def GCCResult(rtconfig, str):
     import subprocess
 
@@ -173,43 +199,44 @@ def GCCResult(rtconfig, str):
     return result
 
 def GenerateGCCConfig(rtconfig):
-    str = ''
-    cc_header = ''
-    cc_header += '#ifndef CCONFIG_H__\n'
-    cc_header += '#define CCONFIG_H__\n'
-    cc_header += '/* Automatically generated file; DO NOT EDIT. */\n'
-    cc_header += '/* compiler configure file for RT-Thread in GCC*/\n\n'
+    # str = ''
+    # cc_header = ''
+    # cc_header += '#ifndef CCONFIG_H__\n'
+    # cc_header += '#define CCONFIG_H__\n'
+    # cc_header += '/* Automatically generated file; DO NOT EDIT. */\n'
+    # cc_header += '/* compiler configure file for RT-Thread in GCC*/\n\n'
 
-    if CheckHeader(rtconfig, 'newlib.h'):
-        str += '#include <newlib.h>\n'
-        cc_header += '#define HAVE_NEWLIB_H 1\n'
-        cc_header += '#define LIBC_VERSION "newlib %s"\n\n' % GetNewLibVersion(rtconfig)
+    # if CheckHeader(rtconfig, 'newlib.h'):
+    #     str += '#include <newlib.h>\n'
+    #     cc_header += '#define HAVE_NEWLIB_H 1\n'
+    #     cc_header += '#define LIBC_VERSION "newlib %s"\n\n' % GetNewLibVersion(rtconfig)
 
-    if CheckHeader(rtconfig, 'sys/signal.h'):
-        str += '#include <sys/signal.h>\n'
-        cc_header += '#define HAVE_SYS_SIGNAL_H 1\n'
-    if CheckHeader(rtconfig, 'sys/select.h'):
-        str += '#include <sys/select.h>\n'
-        cc_header += '#define HAVE_SYS_SELECT_H 1\n'
-    if CheckHeader(rtconfig, 'pthread.h'):
-        str += "#include <pthread.h>\n"
-        cc_header += '#define HAVE_PTHREAD_H 1\n'
+    # if CheckHeader(rtconfig, 'sys/signal.h'):
+    #     str += '#include <sys/signal.h>\n'
+    #     cc_header += '#define HAVE_SYS_SIGNAL_H 1\n'
+    # if CheckHeader(rtconfig, 'sys/select.h'):
+    #     str += '#include <sys/select.h>\n'
+    #     cc_header += '#define HAVE_SYS_SELECT_H 1\n'
+    # if CheckHeader(rtconfig, 'pthread.h'):
+    #     str += "#include <pthread.h>\n"
+    #     cc_header += '#define HAVE_PTHREAD_H 1\n'
 
-    # if CheckHeader(rtconfig, 'sys/dirent.h'):
-    #    str += '#include <sys/dirent.h>\n'
+    # # if CheckHeader(rtconfig, 'sys/dirent.h'):
+    # #    str += '#include <sys/dirent.h>\n'
 
-    # add some common features
-    str += 'const char* version = __VERSION__;\n'
-    str += 'const int iso_c_visible = __ISO_C_VISIBLE;\n'
-    str += '\n#ifdef HAVE_INITFINI_ARRAY\n'
-    str += 'const int init_fini_array = HAVE_INITFINI_ARRAY;\n'
-    str += '#endif\n'
+    # # add some common features
+    # str += 'const char* version = __VERSION__;\n'
+    # str += 'const int iso_c_visible = __ISO_C_VISIBLE;\n'
+    # str += '\n#ifdef HAVE_INITFINI_ARRAY\n'
+    # str += 'const int init_fini_array = HAVE_INITFINI_ARRAY;\n'
+    # str += '#endif\n'
 
-    cc_header += '\n'
-    cc_header += GCCResult(rtconfig, str)
-    cc_header += '\n#endif\n'
+    # cc_header += '\n'
+    # cc_header += GCCResult(rtconfig, str)
+    # cc_header += '\n#endif\n'
 
-    cc_file = open('cconfig.h', 'w')
-    if cc_file:
-        cc_file.write(cc_header)
-        cc_file.close()
+    # cc_file = open('cconfig.h', 'w')
+    # if cc_file:
+    #     cc_file.write(cc_header)
+    #     cc_file.close()
+    pass