Some warnings during build

[sergey-safarov]

Description

This in not important and may be closed at any time.

Some info about build warnings on Alpine dist

Troubleshooting

Reproduction

start a build process on Alpine dist

Debugging Data

NA

Log Messages

CC (gcc) [M regex.so]		regex_mod.o
regex_mod.c: In function 'w_pcre_match_group':
regex_mod.c:663:9: warning: 'num_pcre' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return ki_pcre_match_group(_msg, &string, (int)num_pcre);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
LD (gcc) [M regex.so]		regex.so
CC (gcc) [M db_berkeley.so]		bdb_fld.o

Next

CC (gcc) [M cplc.so]		cpl_parser.o
In file included from ../../core/mem/mem.h:41:0,
                 from cpl_run.c:37:
cpl_run.c: In function 'run_remove_location':
../../core/mem/../dprint.h:302:8: warning: 'url.len' may be used uninitialized in this function [-Wmaybe-uninitialized]
        fprintf(stderr, "%2d(%d) %s: %.*s%s" fmt, \
        ^~~~~~~
cpl_run.c:416:6: note: 'url.len' was declared here
  str url;
      ^~~
CC (gcc) [M cplc.so]		sub_list.o
make[3]: 'libsrdb1.so.1.0' is up to date.

Next

CC (gcc) [M db2_ldap.so]		ld_fld.o
ld_fld.c: In function 'ldap_gentime2db_datetime':
ld_fld.c:273:10: warning: implicit declaration of function 'timelocal' [-Wimplicit-function-declaration]
   *dst = timelocal(&time);
          ^~~~~~~~~
CC (gcc) [M db2_ldap.so]		ld_cmd.o

Next

CC (gcc) [M auth_identity.so]		auth_dynstr.o
CC (gcc) [M auth_identity.so]		auth_crypt.o
auth_crypt.c:29:0: warning: "_GNU_SOURCE" redefined
 #define _GNU_SOURCE
 
<command-line>:0:0: note: this is the location of the previous definition

Next

CC (gcc) [M tls.so]		tls_init.o
tls_init.c:320:13: warning: 'ser_free' defined but not used [-Wunused-function]
 static void ser_free(void *ptr, const char *fname, int fline)
             ^~~~~~~~
CC (gcc) [M tls.so]		tls_dump_vf.o
CC (gcc) [M tls.so]		tls_select.o
CC (gcc) [M tls.so]		tls_cfg.o
CC (gcc) [M tls.so]		tls_map.o
CC (gcc) [M tls.so]		tls_server.o
CC (gcc) [M tls.so]		tls_locking.o
tls_locking.c:85:13: warning: 'dyn_destroy_f' defined but not used [-Wunused-function]
 static void dyn_destroy_f(struct CRYPTO_dynlock_value *l,
             ^~~~~~~~~~~~~
tls_locking.c:67:13: warning: 'dyn_lock_f' defined but not used [-Wunused-function]
 static void dyn_lock_f(int mode, struct CRYPTO_dynlock_value* l,
             ^~~~~~~~~~
tls_locking.c:45:37: warning: 'dyn_create_f' defined but not used [-Wunused-function]
 static struct CRYPTO_dynlock_value* dyn_create_f(const char* file, int line)
                                     ^~~~~~~~~~~~
CC (gcc) [M tls.so]		tls_domain.o
tls_domain.c:872:12: warning: 'tls_ssl_ctx_set_freelist' defined but not used [-Wunused-function]
 static int tls_ssl_ctx_set_freelist(SSL_CTX* ctx, long val, void* unused)
            ^~~~~~~~~~~~~~~~~~~~~~~~
In file included from tls_domain.c:33:0:
tls_domain.c: In function 'load_engine_private_key':
tls_map.h:46:14: warning: 'pkey' may be used uninitialized in this function [-Wmaybe-uninitialized]
   ( (m)->tmp = (value),\
              ^
tls_domain.c:1183:12: note: 'pkey' was declared here
  EVP_PKEY *pkey;
            ^~~~
CC (gcc) [M tls.so]		tls_util.o

Next

CC (gcc) [M ims_usrloc_pcscf.so]		dlist.o
In file included from usrloc_db.c:10:0:
usrloc_db.c: In function 'db_update_pcontact':
usrloc_db.h:46:25: warning: 'service_routes.len' may be used uninitialized in this function [-Wmaybe-uninitialized]
    VAL_STR((_val)).len  = (_str).len;\
                         ^
usrloc_db.c:122:13: note: 'service_routes.len' was declared here
  str impus, service_routes;
             ^~~~~~~~~~~~~~
In file included from usrloc_db.c:10:0:
usrloc_db.h:45:24: warning: 'service_routes.s' may be used uninitialized in this function [-Wmaybe-uninitialized]
    VAL_STR((_val)).s   = (_str).s;\
                        ^
usrloc_db.c:122:13: note: 'service_routes.s' was declared here
  str impus, service_routes;
             ^~~~~~~~~~~~~~
CC (gcc) [M ims_usrloc_pcscf.so]		pcontact.o

Next

CC (gcc) [M evapi.so]		evapi_mod.o
evapi_dispatch.c: In function 'evapi_run_dispatcher':
evapi_dispatch.c:699:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  ev_io_init(&io_server, evapi_accept_client, evapi_srv_sock, EV_READ);
  ^~~~~~~~~~
evapi_dispatch.c:699:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
evapi_dispatch.c:699:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
evapi_dispatch.c:699:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
evapi_dispatch.c:701:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  ev_io_init(&io_notify, evapi_recv_notify, _evapi_notify_sockets[0], EV_READ);
  ^~~~~~~~~~
evapi_dispatch.c:701:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
evapi_dispatch.c:701:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
evapi_dispatch.c:701:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
make[3]: 'libsrutils.so.1.0' is up to date.
LD (gcc) [M evapi.so]		evapi.so

SIP Traffic

NA

Possible Solutions

Additional Information

Compiled master on Alpine 3.8 dist
If this is fixed, then i can provide more warnings.

[henningw]

Thanks for the report. I looked into the TLS warnings, can't reproduce them. What gcc version did you used on the Alpine 3.8 distribution?

[sergey-safarov]

GCC version

/ # gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-alpine-linux-musl/8.2.0/lto-wrapper
Target: x86_64-alpine-linux-musl
Configured with: /home/buildozer/aports/main/gcc/src/gcc-8.2.0/configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --build=x86_64-alpine-linux-musl --host=x86_64-alpine-linux-musl --target=x86_64-alpine-linux-musl --with-pkgversion='Alpine 8.2.0' --enable-checking=release --disable-fixed-point --disable-libstdcxx-pch --disable-multilib --disable-nls --disable-werror --disable-symvers --enable-__cxa_atexit --enable-default-pie --enable-default-ssp --enable-cloog-backend --enable-languages=c,c++,objc,fortran,ada --disable-libssp --disable-libmpx --disable-libmudflap --disable-libsanitizer --enable-shared --enable-threads --enable-tls --with-system-zlib --with-linker-hash-style=gnu
Thread model: posix
gcc version 8.2.0 (Alpine 8.2.0) 

About TLS
Think this may be related to used lebressl instreat openssl. And related to #1670

[linuxmaniac]

You can check travis sid build output its gcc 8.2.0.
So yes, it should be related to not using openssl

[miconda]

I pushed two patches to regex and cplc modules, even they looked more like false positives.

The timelocal() is defined in time.h according to man page and that file is included. TLS was sorted out, ims modules need an overall review for warnings.

Also, the debian sid build didn't show any of these warnings.

I am closing it, as they show up in punctual builds, then we can approach again.