Bug #57997 Compiler flag change build error on OSX 10.6: debug_sync.cc
Submitted: 4 Nov 2010 20:00 Modified: 11 Dec 2010 17:35
Reporter: Karen Langford Email Updates:
Status: Closed Impact on me:
None 
Category:MySQL Server: Compiling Severity:S3 (Non-critical)
Version:5.1.53 OS:Mac OS X (10.6)
Assigned to: Davi Arnaut CPU Architecture:Any

[4 Nov 2010 20:00] Karen Langford
Description:
Compiler flag change causing build failure on:
slid03.norway.sun.com / osx10.6-x86 / i386-apple-darwin10.3.0

bteam@slid03:~> gcc --version
i686-apple-darwin10-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5646) (dot 1)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

ccache gcc -static-libgcc -DMYSQL_SERVER -DDEFAULT_MYSQL_HOME="\"/usr/local/mysql\"" -DMYSQL_DATADIR="\"/usr/local/mysql/data\"" -DSHAREDIR="\"/usr/local/mysql/share\"" -DPLUGINDIR="\"/usr/local/mysql/lib/plugin\"" -DHAVE_EVENT_SCHEDULER -DHAVE_CONFIG_H -I. -I../include -I../zlib -I../include -I../include -I../regex -I.    -Wall -Wextra -Wunused -Wwrite-strings -Wno-strict-aliasing -Werror -Wno-unused-parameter -g  -DSAFE_MUTEX -g -O -arch i386 -felide-constructors -fno-common   -fno-implicit-templates -fno-exceptions -fno-rtti -D_P1003_1B_VISIBLE -DSIGNAL_WITH_VIO_CLOSE -DSIGNALS_DONT_BREAK_READ -DIGNORE_SIGHUP_SIGQUIT  -DDONT_DECLARE_CXA_PURE_VIRTUAL -MT debug_sync.o -MD -MP -MF .deps/debug_sync.Tpo -c -o debug_sync.o debug_sync.cc
cc1plus: warnings being treated as errors
debug_sync.cc: In function 'void debug_sync(THD*, const char*, size_t)':
debug_sync.cc:1721: warning: 'old_proc_info' may be used uninitialized in this function
debug_sync.cc:1721: note: 'old_proc_info' was declared here
make[3]: *** [debug_sync.o] Error 1
make[2]: *** [all-recursive] Error 1
make[1]: *** [all] Error 2
make: *** [all-recursive] Error 1

How to repeat:
Build 5.1.53 without flag --enable-mysql-maintainer-mode=no
[10 Nov 2010 21:15] Bugs System
A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/123501

3503 Davi Arnaut	2010-11-10
      Bug#58057: 5.1 libmysql/libmysql.c unused variable/compile failure
      Bug#57995: Compiler flag change build error on OSX 10.4: my_getncpus.c
      Bug#57996: Compiler flag change build error on OSX 10.5 : bind.c
      Bug#57994: Compiler flag change build error : my_redel.c
      Bug#57993: Compiler flag change build error on FreeBsd 7.0 : regexec.c
      Bug#57992: Compiler flag change build error on FreeBsd : mf_keycache.c
      Bug#57997: Compiler flag change build error on OSX 10.6: debug_sync.cc
      
      Fix assorted compiler generated warnings.
     @ cmd-line-utils/readline/bind.c
        Bug#57996: Compiler flag change build error on OSX 10.5 : bind.c
        
        Initialize variable to work around a false positive warning.
     @ include/m_string.h
        Bug#57994: Compiler flag change build error : my_redel.c
        
        The expansion of stpcpy (in glibc) causes warnings if the
        return value of strmov is not being used. Since stpcpy is
        a GNU extension and the expansion ends up using a built-in
        provided by GCC, use the compiler provided built-in directly
        when possible.
     @ include/my_compiler.h
        Define a dummy MY_GNUC_PREREQ when not compiling with GCC.
     @ libmysql/libmysql.c
        Bug#58057: 5.1 libmysql/libmysql.c unused variable/compile failure
        
        Variable might not be used in some cases. So, tag it as unused.
     @ mysys/mf_keycache.c
        Bug#57992: Compiler flag change build error on FreeBsd : mf_keycache.c
        
        Use UNINIT_VAR to work around a false positive warning.
     @ mysys/my_getncpus.c
        Bug#57995: Compiler flag change build error on OSX 10.4: my_getncpus.c
        
        Declare variable in the same block where it is used.
     @ regex/regexec.c
        Bug#57993: Compiler flag change build error on FreeBsd 7.0 : regexec.c
        
        Work around a compiler bug which causes the cast to not be enforced.
     @ sql/debug_sync.cc
        Bug#57997: Compiler flag change build error on OSX 10.6: debug_sync.cc
        
        Use UNINIT_VAR to work around a false positive warning.
     @ sql/handler.cc
        Use UNINIT_VAR to work around a false positive warning.
     @ sql/slave.cc
        Use UNINIT_VAR to work around a false positive warning.
     @ sql/sql_partition.cc
        Use UNINIT_VAR to work around a false positive warning.
     @ storage/myisam/ft_nlq_search.c
        Use UNINIT_VAR to work around a false positive warning.
     @ storage/myisam/mi_create.c
        Use UNINIT_VAR to work around a false positive warning.
     @ storage/myisammrg/myrg_open.c
        Use UNINIT_VAR to work around a false positive warning.
     @ tests/mysql_client_test.c
        Change function to take a pointer to const, no need for a cast.
[12 Nov 2010 14:34] Jon Olav Hauglid
Ok to push.
[16 Nov 2010 9:46] Davi Arnaut
Pushed into mysql-5.1-bugteam and up.
[20 Nov 2010 0:50] Paul Dubois
Noted in 5.1.54, 5.5.8 changelogs.

Several compilation problems were fixed.
[5 Dec 2010 12:40] Bugs System
Pushed into mysql-trunk 5.6.1 (revid:alexander.nozdrin@oracle.com-20101205122447-6x94l4fmslpbttxj) (version source revid:alexander.nozdrin@oracle.com-20101205122447-6x94l4fmslpbttxj) (merge vers: 5.6.1) (pib:23)
[15 Dec 2010 5:52] Bugs System
Pushed into mysql-5.1 5.1.55 (revid:sunanda.menon@oracle.com-20101215054055-vgwki317xg1wphhh) (version source revid:sunanda.menon@oracle.com-20101215054055-vgwki317xg1wphhh) (merge vers: 5.1.55) (pib:23)
[16 Dec 2010 22:28] Bugs System
Pushed into mysql-5.5 5.5.9 (revid:jonathan.perkin@oracle.com-20101216101358-fyzr1epq95a3yett) (version source revid:jonathan.perkin@oracle.com-20101216101358-fyzr1epq95a3yett) (merge vers: 5.5.9) (pib:24)