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configure.ac
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    [ac_warn_strict_aliasing="$enableval"],
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    [ac_warn_strict_aliasing="no"])
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AC_ARG_ENABLE([cast-warnings],
 
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    [AS_HELP_STRING([--enable-cast-warnings],
 
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       [Enable warnings about use of old C-style casts @<:@default=off@:>@])],
 
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    [ac_warn_cast="$enableval"],
 
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    [ac_warn_cast="no"])
 
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AC_ARG_ENABLE([effective-style],
 
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    [AS_HELP_STRING([--enable-effective-style],
 
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       [Enable warnings violating Effective C++ Style Guidelines @<:@default=off@:>@])],
 
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    [ac_warn_effc="$enableval"],
 
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    [ac_warn_effc="no"])
 
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AC_ARG_ENABLE([go-crazy],
 
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    [AS_HELP_STRING([--enable-go-crazy],
 
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       [Enables extra little warnings that might be too much @<:@default=off@:>@])],
 
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    [ac_warn_go_crazy="$enableval"],
 
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    [ac_warn_go_crazy="no"])
 
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if test "$GCC" = "yes"
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then
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    W_FAIL="-Werror"
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  fi
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  BASE_WARNINGS="-W -Wall -Wextra"
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  GCC_WARNINGS="${C99_SUPPORT_HACK} ${BASE_WARNINGS} ${GCC_PEDANTIC} ${W_UNREACHABLE} ${W_FAIL} ${GPROF_PROFILING} ${GPROF_COVERAGE}"
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  GXX_WARNINGS="${BASE_WARNINGS} ${GXX_PEDANTIC} ${W_UNREACHABLE} ${W_FAIL} ${GPROF_PROFILING} ${GPROF_COVERAGE}"
 
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  if test "$ac_warn_cast" = "yes"
 
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  then
 
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    W_CAST="-Wold-style-cast"
 
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  fi
 
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  if test "$ac_warn_effc" = "yes"
 
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  then
 
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    W_EFFC="-Weffc++"
 
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  fi
 
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  if test "$ac_warn_gocrazy" = "yes"
 
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  then
 
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    W_CRAZY="-Wshadow -Wconversion -Winvalid-pch"
 
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  fi
 
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  BASE_WARNINGS="-W -Wall -Wextra -Wunused-macros"
 
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  GCC_WARNINGS="${C99_SUPPORT_HACK} ${BASE_WARNINGS} ${GCC_PEDANTIC} ${W_UNREACHABLE} ${W_FAIL} ${GPROF_PROFILING} ${GPROF_COVERAGE} ${W_CRAZY}"
 
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  GXX_WARNINGS="${BASE_WARNINGS} ${GXX_PEDANTIC} ${W_UNREACHABLE} ${W_FAIL} ${GPROF_PROFILING} ${GPROF_COVERAGE} ${W_CAST} ${W_EFFC} ${W_CRAZY}"
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  AM_CXXFLAGS="${GXX_WARNINGS} ${AM_CXXFLAGS}"
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  AM_CFLAGS="${GCC_WARNINGS} ${AM_CFLAGS}"