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    perf: Enable more compiler warnings · 83a0944f
    Ingo Molnar 提交于
    Related to a shadowed variable bug fix Valdis Kletnieks noticed
    that perf does not get built with -Wshadow, which could have
    helped us avoid the bug.
    
    So enable -Wshadow and also enable the following warnings on
    perf builds, in addition to the already enabled -Wall -Wextra
    -std=gnu99 warnings:
    
     -Wcast-align
     -Wformat=2
     -Wshadow
     -Winit-self
     -Wpacked
     -Wredundant-decls
     -Wstack-protector
     -Wstrict-aliasing=3
     -Wswitch-default
     -Wswitch-enum
     -Wno-system-headers
     -Wundef
     -Wvolatile-register-var
     -Wwrite-strings
     -Wbad-function-cast
     -Wmissing-declarations
     -Wmissing-prototypes
     -Wnested-externs
     -Wold-style-definition
     -Wstrict-prototypes
     -Wdeclaration-after-statement
    
    And change/fix the perf code to build cleanly under GCC 4.3.2.
    
    The list of warnings enablement is rather arbitrary: it's based
    on my (quick) reading of the GCC manpages and trying them on
    perf.
    
    I categorized the warnings based on individually enabling them
    and looking whether they trigger something in the perf build.
    If i liked those warnings (i.e. if they trigger for something
    that arguably could be improved) i enabled the warning.
    
    If the warnings seemed to come from language laywers spamming
    the build with tons of nuisance warnings i generally kept them
    off. Most of the sign conversion related warnings were in
    this category. (A second patch enabling some of the sign
    warnings might be welcome - sign bugs can be nasty.)
    
    I also kept warnings that seem to make sense from their manpage
    description and which produced no actual warnings on our code
    base. These warnings might still be turned off if they end up
    being a nuisance.
    
    I also left out a few warnings that are not supported in older
    compilers.
    
    [ Note that these changes might break the build on older
      compilers i did not test, or on non-x86 architectures that
      produce different warnings, so more testing would be welcome. ]
    
    Reported-by: Valdis.Kletnieks@vt.edu
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    LKML-Reference: <new-submission>
    Signed-off-by: NIngo Molnar <mingo@elte.hu>
    83a0944f
symbol.c 21.1 KB