clisp -Wshift-negative-value on

Hi Bruno,

is this benign?

--8<---------------cut here---------------start------------->8---
../src/debug.d:571:7: warning: shifting a negative signed value is undefined
      [-Wshift-negative-value]
      dynamic_unbind(S(standard_input));
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../src/lispbibl.d:12811:5: note: expanded from macro 'dynamic_unbind'
    dynamic_unbind_g();                           \
    ^~~~~~~~~~~~~~~~~~
../src/lispbibl.d:12804:3: note: expanded from macro 'dynamic_unbind_g'
  CHECK_DYNBIND;                                                        \
  ^~~~~~~~~~~~~
../src/lispbibl.d:12798:53: note: expanded from macro 'CHECK_DYNBIND'
    if (!((as_oint(STACK_0) & wbit(frame_bit_o)) && framecode(STACK_0))) \
                                                    ^~~~~~~~~~~~~~~~~~
../src/lispbibl.d:12318:59: note: expanded from macro 'framecode'
    #define framecode(bottomword)  (as_oint(bottomword) & minus_wbit(FB1))
                                                          ^~~~~~~~~~~~~~~
../src/lispbibl.d:3042:23: note: expanded from macro 'minus_wbit'
  #define minus_wbit  minus_bit
                      ^
../src/lispbibl.d:1195:27: note: expanded from macro 'minus_bit'
#define minus_bit(n)  (-1L<<(n))
                       ~~~^
--8<---------------cut here---------------end--------------->8---

Darwin 16.4.0 Darwin Kernel Version 16.4.0: Thu Dec 22 22:53:21 PST 2016; root:xnu-3789.41.3~3/RELEASE_X86_64 x86_64

$ gcc --version
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/usr/include/c++/4.2.1
Apple LLVM version 8.0.0 (clang-800.0.42.1)
Target: x86_64-apple-darwin16.4.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin



-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.1504
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Shady characters are often very bright.

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