Jeroen created ARROW-5849:
-----------------------------
Summary: Compiler warnings on mingw-w64
Key: ARROW-5849
URL: https://issues.apache.org/jira/browse/ARROW-5849
Project: Apache Arrow
Issue Type: Bug
Components: C++
Affects Versions: 0.14.0
Reporter: Jeroen
In mingw64 we see the following warnings:
{code}
[ 54%] Building CXX object
src/arrow/CMakeFiles/arrow_static.dir/util/io-util.cc.obj
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/arrow/cpp/src/arrow/util/decimal.cc:
In static member function 'static arrow::Status
arrow::Decimal128::FromString(const string_view&, arrow::Decimal128*, int32_t*,
int32_t*)':
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/arrow/cpp/src/arrow/util/decimal.cc:313:35:
warning: 'dec.arrow::{anonymous}::DecimalComponents::exponent' may be used
uninitialized in this function [-Wmaybe-uninitialized]
*scale = -adjusted_exponent + len - 1;
~~~~~~~~~~~~~~~~~~~^~~~
{code}
{code}
[ 56%] Building CXX object
src/arrow/CMakeFiles/arrow_static.dir/util/string_builder.cc.obj
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/arrow/cpp/src/arrow/util/io-util.cc:
In static member function 'static arrow::Status
arrow::internal::TemporaryDir::Make(const string&,
std::unique_ptr<arrow::internal::TemporaryDir>*)':
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/arrow/cpp/src/arrow/util/io-util.cc:897:3:
warning: 'created' may be used uninitialized in this function
[-Wmaybe-uninitialized]
if (!created) {
^~
{code}
And on mingw32 we also see these:
{code}
[ 56%] Building CXX object
src/arrow/CMakeFiles/arrow_static.dir/util/string_builder.cc.obj
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/arrow/cpp/src/arrow/util/io-util.cc:
In static member function 'static arrow::Status
arrow::internal::TemporaryDir::Make(const string&,
std::unique_ptr<arrow::internal::TemporaryDir>*)':
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/arrow/cpp/src/arrow/util/io-util.cc:897:3:
warning: 'created' may be used uninitialized in this function
[-Wmaybe-uninitialized]
if (!created) {
^~
{code}
{code}
54%] Building CXX object
src/arrow/CMakeFiles/arrow_static.dir/util/logging.cc.obj
In file included from
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/arrow/cpp/src/arrow/util/io-util.cc:63:
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/arrow/cpp/src/arrow/io/mman.h:
In function 'void* mmap(void*, size_t, int, int, int, off_t)':
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/arrow/cpp/src/arrow/io/mman.h:94:62:
warning: right shift count >= width of type [-Wshift-count-overflow]
const DWORD dwMaxSizeHigh = static_cast<DWORD>((maxSize >> 32) &
0xFFFFFFFFL);
^~
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/arrow/cpp/src/arrow/util/io-util.cc:
In function 'arrow::Status arrow::internal::MemoryMapRemap(void*, size_t,
size_t, int, void**)':
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/arrow/cpp/src/arrow/util/io-util.cc:568:55:
warning: right shift count >= width of type [-Wshift-count-overflow]
LONG new_size_high = static_cast<LONG>((new_size >> 32) & 0xFFFFFFFFL);
{code}
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