error: comparison of integer expressions of different signedness

[dkbattle]

In the QuantUtilsTest.cc on line 641 I am getting the error "error: comparison of integer expressions of different signedness: ‘std::vector::size_type’ {aka ‘long unsigned int’} and ‘int’ [-Werror=sign-compare] [build] 641 | assert(float_test_input.size() == row * col);"

If any assistance can be provided, that would be awesome!

[jianyuh]

Which compiler version did you use and do you have more detailed repro? Thanks!

[Llcoolsouder]

I recently had the same error message using clang. Switching to g++ seemed to fix the issue. @dkbattle

[sneurlax]

I get same on v4.3.4 (v4.3.1 is fine) from a different test:

In file included from ./external/unity/unity.h:16,
                 from tests/testutil_unity.hpp:36,
                 from tests/testutil.cpp:30:
tests/testutil.cpp: In function 'fd_t connect_socket(const char*, int, int)':
./external/unity/unity.h:134:130: error: comparison of integer expressions of different signedness: 'int' and 'const fd_t' {aka 'const long long unsigned int'} [-Werror=sign-compare]
  134 | #define TEST_ASSERT_NOT_EQUAL(expected, actual)                                                    UNITY_TEST_ASSERT(((expected) !=  (actual)), __LINE__, " Expected Not-Equal")
      |                                                                                                                       ~~~~~~~~~~~^~~~~~~~~~~~
./external/unity/unity_internals.h:654:102: note: in definition of macro 'UNITY_TEST_ASSERT'
  654 | #define UNITY_TEST_ASSERT(condition, line, message)                                              if (condition) {} else {UNITY_TEST_FAIL((UNITY_LINE_TYPE)(line), (message));}
      |                                                                                                      ^~~~~~~~~
tests/testutil.cpp:389:5: note: in expansion of macro 'TEST_ASSERT_NOT_EQUAL'
  389 |     TEST_ASSERT_NOT_EQUAL (-1, s_pre);
      |     ^~~~~~~~~~~~~~~~~~~~~
tests/testutil.cpp: In function 'fd_t bind_socket_resolve_port(const char*, const char*, char*, int, int)':
./external/unity/unity.h:134:130: error: comparison of integer expressions of different signedness: 'int' and 'const fd_t' {aka 'const long long unsigned int'} [-Werror=sign-compare]
  134 | #define TEST_ASSERT_NOT_EQUAL(expected, actual)                                                    UNITY_TEST_ASSERT(((expected) !=  (actual)), __LINE__, " Expected Not-Equal")
      |                                                                                                                       ~~~~~~~~~~~^~~~~~~~~~~~
./external/unity/unity_internals.h:654:102: note: in definition of macro 'UNITY_TEST_ASSERT'
  654 | #define UNITY_TEST_ASSERT(condition, line, message)                                              if (condition) {} else {UNITY_TEST_FAIL((UNITY_LINE_TYPE)(line), (message));}
      |                                                                                                      ^~~~~~~~~
tests/testutil.cpp:446:5: note: in expansion of macro 'TEST_ASSERT_NOT_EQUAL'
  446 |     TEST_ASSERT_NOT_EQUAL (-1, s_pre);
      |     ^~~~~~~~~~~~~~~~~~~~

I am building zmq like:

#!/bin/bash

export SCRIPTDIR="$(pwd)"
export WORKDIR=${SCRIPTDIR}/build
export TYPES_OF_BUILD="x86_64"
export PREFIX=$WORKDIR/prefix_${TYPES_OF_BUILD}
export HOST=x86_64-w64-mingw32

ZMQ_SRC_DIR=$WORKDIR/libzmq
ZMQ_BRANCH=v4.3.4
ZMQ_COMMIT_HASH=4097855ddaaa65ed7b5e8cb86d143842a594eebd

cd $WORKDIR
rm -rf $ZMQ_SRC_DIR
git clone https://github.com/zeromq/libzmq.git ${ZMQ_SRC_DIR} -b ${ZMQ_BRANCH}
cd $ZMQ_SRC_DIR
git checkout ${ZMQ_COMMIT_HASH}
./autogen.sh

./configure \
	--without-documentation \
	--without-docs \
	--disable-shared \
	--disable-curve \
	--prefix=${PREFIX} \
	--host=${HOST} \
	--enable-static \
	--with-pic \
	define=ZMQ_STATIC\
	CFLAGS="-Wall -Wno-pedantic-ms-format -DLIBCZMQ_EXPORTS -DZMQ_DEFINED_STDINT" \
	LDFLAGS="-lws2_32 -liphlpapi -lrpcrt4" #-L/usr/x86_64-w64-mingw32/lib \
	#--without-libsodium \
make CROSS=x86_64-w64-mingw32.static- -j$THREADS
make install

# See http://vrecan.github.io/post/crosscompile_go_zeromq/
# See https://stackoverflow.com/questions/21322707/zlib-header-not-found-when-cross-compiling-with-mingw

Again, downgrading to v4.3.1 is a workaround for this issue.