ODB compiler generates "-.s" file

[roe85]

Every time we run the ODB compiler v2.5.0. It seems to be generating a -.s-file with one line of content:
.file ""

This is mildly annoying because its next to the source code and pollutes our source checkout.
We have only seen this on our RHEL8 which using stock GCC 8.5 and your ODB binaries.
As far as I remember this was not an issue on our CentOS 7, but we have retired that, so I cannot check.

[boris-kolpackov]

Yes, we've seen this but could not quite catch the cause. Does it happen for you on successful compilations or only when the ODB compiler exits with an error?

[roe85]

Its there on all successful compilations.

[boris-kolpackov]

I just tried to reproduce it on RHEL 8.10 with stock GCC 8.5.0-23 and I don't get this file. Specifically:

$ cat <<EOF >test.hxx
#pragma db object
struct object
{
  #pragma db id
  int id;
};
EOF

$ odb -d pgsql test.hxx
$ ls -- -.s
ls: cannot access '-.s': No such file or directory

Can you try this exact test and see what happens?

[FrogTheFrog]

Hello, let me also join in.

I'm executing the command with the contents as described above and I get the following output:

$ odb -d pgsql ./test.hxx -v
Profile search paths:
 /usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8
 /usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/x86_64-redhat-linux
 /usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/backward
 /usr/lib/gcc/x86_64-redhat-linux/8/include
 /usr/local/include
 /usr/include
Compiling ./test.hxx
g++ -x c++ -std=c++98 -S -Wunknown-pragmas -Wno-deprecated -fplugin=/usr/bin/odb.so -v -fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8 -fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/x86_64-redhat-linux -fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/backward -fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/include -fplugin-arg-odb-svc-path=/usr/local/include -fplugin-arg-odb-svc-path=/usr/include -DODB_COMPILER -DODB_COMPILER_VERSION=2050000 -DODB_DATABASE_PGSQL -fplugin-arg-odb-database=pgsql -fplugin-arg-odb-svc-file=./test.hxx -
Using built-in specs.
COLLECT_GCC=/usr/bin/g++
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl --disable-libmpx --enable-offload-targets=nvptx-none --without-cuda-driver --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
Thread model: posix
gcc version 8.5.0 20210514 (Red Hat 8.5.0-10) (GCC) 
COLLECT_GCC_OPTIONS='-std=c++98' '-S' '-Wunknown-pragmas' '-Wno-deprecated' '-fplugin=/usr/bin/odb.so' '-v' '-fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8' '-fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/x86_64-redhat-linux' '-fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/backward' '-fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/include' '-fplugin-arg-odb-svc-path=/usr/local/include' '-fplugin-arg-odb-svc-path=/usr/include' '-D' 'ODB_COMPILER' '-D' 'ODB_COMPILER_VERSION=2050000' '-D' 'ODB_DATABASE_PGSQL' '-fplugin-arg-odb-database=pgsql' '-fplugin-arg-odb-svc-file=./test.hxx' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
 /usr/libexec/gcc/x86_64-redhat-linux/8/cc1plus -quiet -v -iplugindir=/usr/lib/gcc/x86_64-redhat-linux/8/plugin -D_GNU_SOURCE -D ODB_COMPILER -D ODB_COMPILER_VERSION=2050000 -D ODB_DATABASE_PGSQL - -iplugindir=/usr/lib/gcc/x86_64-redhat-linux/8/plugin -quiet -dumpbase - -mtune=generic -march=x86-64 -auxbase - -Wunknown-pragmas -Wno-deprecated -std=c++98 -version -fplugin=/usr/bin/odb.so -fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8 -fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/x86_64-redhat-linux -fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/backward -fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/include -fplugin-arg-odb-svc-path=/usr/local/include -fplugin-arg-odb-svc-path=/usr/include -fplugin-arg-odb-database=pgsql -fplugin-arg-odb-svc-file=./test.hxx -o -.s
GNU C++98 (GCC) version 8.5.0 20210514 (Red Hat 8.5.0-10) (x86_64-redhat-linux)
        compiled by GNU C version 8.5.0 20210514 (Red Hat 8.5.0-10), GMP version 6.1.2, MPFR version 3.1.6-p2, MPC version 1.1.0, isl version isl-0.16.1-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Versions of loaded plugins:
 odb: 2.5.0
ignoring nonexistent directory "/usr/lib/gcc/x86_64-redhat-linux/8/include-fixed"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-redhat-linux/8/../../../../x86_64-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8
 /usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/x86_64-redhat-linux
 /usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/backward
 /usr/lib/gcc/x86_64-redhat-linux/8/include
 /usr/local/include
 /usr/include
End of search list.
GNU C++98 (GCC) version 8.5.0 20210514 (Red Hat 8.5.0-10) (x86_64-redhat-linux)
        compiled by GNU C version 8.5.0 20210514 (Red Hat 8.5.0-10), GMP version 6.1.2, MPFR version 3.1.6-p2, MPC version 1.1.0, isl version isl-0.16.1-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Versions of loaded plugins:
 odb: 2.5.0
Compiler executable checksum: b9cf01844cbe11bf16ed5c8a3873e08d
COMPILER_PATH=/usr/libexec/gcc/x86_64-redhat-linux/8/:/usr/libexec/gcc/x86_64-redhat-linux/8/:/usr/libexec/gcc/x86_64-redhat-linux/:/usr/lib/gcc/x86_64-redhat-linux/8/:/usr/lib/gcc/x86_64-redhat-linux/
LIBRARY_PATH=/usr/lib/gcc/x86_64-redhat-linux/8/:/usr/lib/gcc/x86_64-redhat-linux/8/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-redhat-linux/8/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-std=c++98' '-S' '-Wunknown-pragmas' '-Wno-deprecated' '-fplugin=/usr/bin/odb.so' '-v' '-fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8' '-fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/x86_64-redhat-linux' '-fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/backward' '-fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/include' '-fplugin-arg-odb-svc-path=/usr/local/include' '-fplugin-arg-odb-svc-path=/usr/include' '-D' 'ODB_COMPILER' '-D' 'ODB_COMPILER_VERSION=2050000' '-D' 'ODB_DATABASE_PGSQL' '-fplugin-arg-odb-database=pgsql' '-fplugin-arg-odb-svc-file=./test.hxx' '-shared-libgcc' '-mtune=generic' '-march=x86-64'

---

Just running

g++ -x c++ -std=c++98 -S -Wunknown-pragmas -Wno-deprecated -fplugin=/usr/bin/odb.so -v -fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8 -fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/x86_64-redhat-linux -fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/backward -fplugin-arg-odb-svc-path=/usr/lib/gcc/x86_64-redhat-linux/8/include -fplugin-arg-odb-svc-path=/usr/local/include -fplugin-arg-odb-svc-path=/usr/include -DODB_COMPILER -DODB_COMPILER_VERSION=2050000 -DODB_DATABASE_PGSQL -fplugin-arg-odb-database=pgsql -fplugin-arg-odb-svc-file=./test.hxx -

already generates the -.s file.

---

I don't know if it's relevant, but it fails to compile when trace is provided instead:

$ odb -d pgsql --trace ./test.hxx
starting plugin odb
namespace std at <built-in>:0
start record_type object at ./test.hxx:2
integer_type 0x7f8b3820b5e8 main 0x7f8b3820b5e8
        variant 0x7f8b3820b5e8 0
found node 0x55c46206cab0 for type 0x7f8b3820b5e8
        public data member int (0x55c46206cab0) id at ./test.hxx:5
                 pragma id
end record_type object (0x55c461fca888) at ./test.hxx:2
                 pragma object
./test.hxx: error: unable to resolve odb namespace