[ruby-core:75516] [Ruby trunk Bug#12383][Feedback] Warnings when compiling proc.c on cygwin

From: nobu@...
Date: 2016-05-15 13:24:48 UTC
List: ruby-core #75516
Issue #12383 has been updated by Nobuyoshi Nakada.

Description updated
Status changed from Open to Feedback

I don't see that warning, with `optflags=-O0` .. `-O3`.

```
$ LANG=C gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-cygwin/5.3.0/lto-wrapper.exe
Target: x86_64-pc-cygwin
Configured with: /cygdrive/i/szsz/tmpp/gcc/gcc-5.3.0-5.x86_64/src/gcc-5.3.0/configure --srcdir=/cygdrive/i/szsz/tmpp/gcc/gcc-5.3.0-5.x86_64/src/gcc-5.3.0 --prefix=/usr --exec-prefix=/usr --localstatedir=/var --sysconfdir=/etc --docdir=/usr/share/doc/gcc --htmldir=/usr/share/doc/gcc/html -C --build=x86_64-pc-cygwin --host=x86_64-pc-cygwin --target=x86_64-pc-cygwin --without-libiconv-prefix --without-libintl-prefix --libexecdir=/usr/lib --enable-shared --enable-shared-libgcc --enable-static --enable-version-specific-runtime-libs --enable-bootstrap --enable-__cxa_atexit --with-dwarf2 --with-tune=generic --enable-languages=ada,c,c++,fortran,lto,objc,obj-c++ --enable-graphite --enable-threads=posix --enable-libatomic --enable-libcilkrts --enable-libgomp --enable-libitm --enable-libquadmath --enable-libquadmath-support --enable-libssp --enable-libada --enable-libgcj-sublibs --disable-java-awt --disable-symvers --with-ecj-jar=/usr/share/java/ecj.jar --with-gnu-ld --with-gnu-as --with-cloog-include=/usr/include/cloog-isl --without-libiconv-prefix --without-libintl-prefix --with-system-zlib --enable-linker-build-id --with-default-libstdcxx-abi=gcc4-compatible
Thread model: posix
gcc version 5.3.0 (GCC) 
```

----------------------------------------
Bug #12383: Warnings when compiling proc.c on cygwin
https://bugs.ruby-lang.org/issues/12383#change-58632

* Author: Martin Dürst
* Status: Feedback
* Priority: Normal
* Assignee: Nobuyoshi Nakada
* ruby -v: ruby 2.4.0dev (2016-05-15 trunk 55004) [x86_64-cygwin]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
When compiling ruby on cygwin, I get the following warnings for proc.c:

```
compiling proc.c
proc.c: In function ‘call_method_data_safe’:
proc.c:1984:11: warning: variable ‘result’ might be clobbered by ‘longjmp’ or ‘vfork’ [-Wclobbered]
     VALUE result = Qnil; /* OK */
           ^
proc.c: At top level:
cc1: warning: unrecognized command line option ‘-Wno-self-assign’
cc1: warning: unrecognized command line option ‘-Wno-constant-logical-operand’
cc1: warning: unrecognized command line option ‘-Wno-parentheses-equality’
cc1: warning: unrecognized command line option ‘-Wno-tautological-compare’
compiling random.c
```



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