Compiler gives wrong warning for "comparison of promoted ~unsigned with
unsigned" when compiling with ARM-ELF.
Submit script for building arm-elf toolchain and testcode.
Compilation using;
arm-elf-gcc -c cast.c -W
cast.c: In function 'test_cast':
cast.c:13: warning: comparison of promoted ~unsigned with unsigned
Best Regards
Fredrik Hederstierna
============
FILE: cast.c
============
typedef unsigned char u8_t;
void test_cast(void) {
unsigned char c1 = 0;
unsigned char c2 = 0;
u8_t u1 = 0;
u8_t u2 = 0;
if (c1 == (unsigned char)(~c2)) {
}
if (u1 == (u8_t)(~u2)) { // THIS WILL GIVE WARNING
}
}
========================
FILE: build_toolchain.sh
========================
set -e -x
TARGET=arm-elf
BINUTILS_VERSION=2.19
GCC_VERSION=4.3.2
NEWLIB_VERSION=1.16.0
GDB_VERSION=6.8
INSIGHT_VERSION=6.8
DEST="/usr/local/gcc/arm-elf-tools-$GCC_VERSION"
BINUTILS_DIR="binutils-$BINUTILS_VERSION"
GCC_DIR="gcc-$GCC_VERSION"
NEWLIB_DIR="newlib-$NEWLIB_VERSION"
GDB_DIR="gdb-$GDB_VERSION"
INSIGHT_DIR="insight-$INSIGHT_VERSION"
# set rwx access
umask 022
# unpack tar-balls
rm -fr "$BINUTILS_DIR" "$GCC_DIR" "$NEWLIB_DIR" "$GDB_DIR" "$INSIGHT_DIR"
tar xvjf "binutils-$BINUTILS_VERSION.tar.bz2"
tar xvjf "gcc-$GCC_VERSION.tar.bz2"
tar xvzf "newlib-$NEWLIB_VERSION.tar.gz"
tar xvjf "gdb-$GDB_VERSION.tar.bz2"
tar xvjf "insight-$INSIGHT_VERSION.tar.bz2"
cd "$GCC_DIR"
ln -s "../$NEWLIB_DIR/newlib" newlib
ln -s "../$NEWLIB_DIR/libgloss" libgloss
cd ..
rm -fr build
mkdir -p build/binutils build/gcc build/gdb build/insight build/newlib
# Build binutils
cd build/binutils
"../../$BINUTILS_DIR/configure" --target="$TARGET" --prefix="$DEST"
--disable-nls
make LDFLAGS=-s all install
# Build GCC
cd ../gcc
PATH="$DEST/bin:$PATH"
"../../$GCC_DIR/configure" --enable-languages=c,c++ --target="$TARGET"
--prefix="$DEST" --with-gnu-as --with-gnu-ld --disable-nls --with-newlib
--disable-__cxa_atexit --with-ecos
make LDFLAGS=-s all all-gcc all-target-libstdc++-v3 install install-gcc
install-target-libstdc++-v3
# Build GDB and Insight
cd ../gdb
# Without insight
"../../$GDB_DIR/configure" --target="$TARGET" --prefix="$DEST"
make -w all install
cd ../insight
# With insight
"../../$INSIGHT_DIR/configure" --target="$TARGET" --prefix="$DEST"
make -w all install
# Remove uncompressed sources
cd ../..
rm -fr "$BINUTILS_DIR" "$GCC_DIR" "$NEWLIB_DIR" "$GDB_DIR" "$INSIGHT_DIR" build
--
Summary: Wrong warning comparison of promoted ~unsigned with
unsigned
Product: gcc
Version: 4.3.2
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: fredrik dot hederstierna at securitas-direct dot com
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: arm-elf-gcc
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38341
