Warning and note in sqlite3-binding.c

[KrisCarr]

Every time my application starts or tests are run I get the following in my output:

# github.com/mattn/go-sqlite3
sqlite3-binding.c: In function ‘sqlite3SelectNew’:
sqlite3-binding.c:128049:10: warning: function may return address of local variable [-Wreturn-local-addr]
128049 |   return pNew;
       |          ^~~~
sqlite3-binding.c:128009:10: note: declared here
128009 |   Select standin;
       |          ^~~~~~~

I can get round this by adding -w to the CFLAGS option inside sqlite3.go

Is there a better way to get rid of this warning and note?

I am running on Fedora 32 x86_64

[KrisCarr]

I have added -Wno-return-local-addr" to my environment variables in .bashrc which has got rid of all that mess for the time being.

export CGO_CFLAGS="-g -O2 -Wno-return-local-addr"

[james-d-elliott]

A user of a product I am one of the maintainers for complained about the same thing. If you're able I'm interested in your gcc, glibc, and libsqlite3 versions; as it works fine for me.

For ref my versions are 9.3, 2.31, and 3.31.1

[pgnd]

with

sqlite3 --version
	3.31.1 2020-01-27 19:55:54 3bfa9cc97da10598521b342961df8f5f68c7388fa117345eeb516eaa837balt1

build with gcc10

	echo $CC $CXX $CPP
		/usr/bin/gcc-10 /usr/bin/g++-10 /usr/bin/cpp-10
	$CC --version
		gcc-10 (SUSE Linux) 10.1.1 20200507 [revision dd38686d9c810cecbaa80bb82ed91caaa58ad635]
	go build github.com/mattn/go-sqlite3
		# github.com/mattn/go-sqlite3
		sqlite3-binding.c: In function ‘sqlite3SelectNew’:
		sqlite3-binding.c:128049:10: warning: function may return address of local variable [-Wreturn-local-addr]
		128049 |   return pNew;
		       |          ^~~~
		sqlite3-binding.c:128009:10: note: declared here
		128009 |   Select standin;
		       |          ^~~~~~~

and, build with gcc9

	echo $CC $CXX $CPP
		/usr/bin/gcc-9 /usr/bin/g++-9 /usr/bin/cpp-9
	$CC --version
		gcc-9 (SUSE Linux) 9.3.1 20200406 [revision 6db837a5288ee3ca5ec504fbd5a765817e556ac2]
	go build github.com/mattn/go-sqlite3

=====> NO SQLITE3 ERROR <====

[james-d-elliott]

Yeah, looks like a gcc 10 issue, 9.3 works fine. It's likely the issue lies with libsqlite3-0 3.31.1 and gcc 10.x. Either a new warning being detected or a problem with 10.x - a lot of issues were resolved in 10.1 marked as regressions introduced between 9.3 and 10.0 (~700) so it could be that.

[pgnd]

looks likely

git clone https://github.com/sqlite/sqlite.git
cd sqlite
git checkout version-3.31.1
gcc --version
	gcc (SUSE Linux) 10.1.1 20200507 [revision dd38686d9c810cecbaa80bb82ed91caaa58ad635]
./configure
make
	...
	libtool: link: /usr/bin/gcc-10 -O3 -Wall -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fmessage-length=0 -grecord-gcc-switches -march=native -mtune=native -D_FORTIFY_SOURCE=2 -O3 -Wall -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fmessage-length=0 -grecord-gcc-switches -march=native -mtune=native -DSQLITE_OS_UNIX=1 -I. -I/usr/local/src/sqlite/src -I/usr/local/src/sqlite/ext/rtree -I/usr/local/src/sqlite/ext/icu -I/usr/local/src/sqlite/ext/fts3 -I/usr/local/src/sqlite/ext/async -I/usr/local/src/sqlite/ext/session -I/usr/local/src/sqlite/ext/userauth -D_HAVE_SQLITE_CONFIG_H -DBUILD_sqlite -DNDEBUG -DSQLITE_THREADSAFE=1 -DSQLITE_HAVE_ZLIB=1 -DHAVE_READLINE=0 -DHAVE_EDITLINE=1 -DSQLITE_ENABLE_JSON1 -DSQLITE_ENABLE_FTS4 -DSQLITE_ENABLE_RTREE -DSQLITE_ENABLE_EXPLAIN_COMMENTS -DSQLITE_ENABLE_UNKNOWN_SQL_FUNCTION -DSQLITE_ENABLE_STMTVTAB -DSQLITE_ENABLE_DBPAGE_VTAB -DSQLITE_ENABLE_DBSTAT_VTAB -DSQLITE_ENABLE_OFFSET_SQL_FUNC -DSQLITE_ENABLE_DESERIALIZE -o sqlite3 shell.c sqlite3.c  -ledit -ldl -lz -lpthread -Wl,-rpath -Wl,/usr/local/sqlite-gcc10-test/lib64
	In function 'zipfileComparePath',
	    inlined from 'zipfileUpdate' at shell.c:5784:11:
	shell.c:5656:17: warning: '__builtin_memcmp_eq' specified size between 18446744071562067968 and 18446744073709551615 exceeds maximum object size 9223372036854775807 [-Wstringop-overflow=]
	 5656 |   if( nA==nB && memcmp(zA, zB, nA)==0 ) return 0;
	      |                 ^~~~~~~~~~~~~~~~~~
	sqlite3.c: In function ‘sqlite3SelectNew’:
	sqlite3.c:128048:10: warning: function may return address of local variable [-Wreturn-local-addr]
	128048 |   return pNew;
	       |          ^~~~
	sqlite3.c:128008:10: note: declared here
	128008 |   Select standin;
	       |          ^~~~~~~
	sqlite3.c:128008:10: note: declared here
	sqlite3.c: In function 'sqlite3SelectNew':
	sqlite3.c:128048:10: warning: function may return address of local variable [-Wreturn-local-addr]
	128048 |   return pNew;
	       |          ^~~~
	sqlite3.c:128008:10: note: declared here
	128008 |   Select standin;
	       |          ^~~~~~~
	sqlite3.c:128008:10: note: declared here
	...

[rbucker]

In my case...

$ go get -u -v github.com/mattn/go-sqlite3
# github.com/mattn/go-sqlite3
sqlite3-binding.c: In function ‘sqlite3SelectNew’:
sqlite3-binding.c:128049:10: warning: function may return address of local variable [-Wreturn-local-addr]
128049 |   return pNew;
       |          ^~~~
sqlite3-binding.c:128009:10: note: declared here
128009 |   Select standin;
       |          ^~~~~~~

ClearLinux version:

$ swupd check-update 
Current OS version: 33100
Latest server version: 33100
There are no updates available

GCC Version

$ gcc --version
gcc (Clear Linux OS for Intel Architecture) 10.1.1 20200513 releases/gcc-10.1.0-36-gf2b77b928a
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

windows 10 x64 2004 has the same issue

[james-d-elliott]

This is an upstream bug with libsqlite3, not sure where their bug tracker is.

[subpop]

This is an upstream bug with libsqlite3, not sure where their bug tracker is.

https://www3.sqlite.org/cgi/src/ticket

[LawnGnome]

There's a discussion on the SQLite Forum about this issue, including a candidate patch.