Re: Compiling C Extension Functions against PostgreSQL 12

Tom Lane-2 wrote
> TalGloz <

> glozmantal@

> > writes:
>> I dont understand why the output for Postgres  12 
>> g++ -Wall -Wpointer-arith -Wendif-labels -Wmissing-format-attribute
>> -Wformat-security -fno-strict-aliasing -fwrapv -O2 -o seal_diff_cpp.o -c
>> seal_diff_cpp.cpp
>> seal_diff_cpp.cpp:2:10: fatal error: postgres.h: No such file or
>> directory
>>     2 | #include "postgres.h"
>>       |          ^~~~~~~~~~~~
> 
>> looks different form the ones of Postgres 10
> 
> Looking at your Makefile, it seems to be expecting that CXXFLAGS will
> be honored in the build, and it isn't being.
> 
> As far as I can see from pgxs.mk, you're supposed to spell that
> PG_CXXFLAGS.  Probably, it accidentally worked to do it the other
> way in v10, but no longer does, likely as a result of the fact that
> there's now some minimal amount of C++ code in core PG.
> 
> I'm a little dubious about whether overriding CXX is a good idea now, too.
> (Likely the core setting is the same, but if it were pointing at a
> different compiler that could cause trouble.)
> 
>             regards, tom lane

I've added some output to a different module Makefile that uses the same
libraries and Changed "CXXFLAGS" to "PG_CXXFLAGS" and "LDFLAGS" to
"PG_LDFLAGS":

# This file crates the seal_mean_cxx_v2.so library for the PostgreSQL
# Usage:
# make             # compiles all
# make clean    # clean all binaries and objects

MODULES = seal_mean_cxx_v2

# Location of PostgreSQL pg_config file
PG_CONFIG = /usr/pgsql-10/bin/pg_config
# PostgreSQL path to PGXS
PGXS = $(shell $(PG_CONFIG) --pgxs)
# PostgreSQL path to server header files
INCLUDEDIR = $(shell $(PG_CONFIG) --includedir-server)
# PostgreSQL path to executable shared libraries
POSGRESLIBINSTALL = $(shell $(PG_CONFIG) --pkglibdir)

# Location of the installed seal library
INCLUDE_SEAL = /usr/local/include
# Location of the compiled seal lib library
INCLUDE_SEAL_LIB = /usr/local/lib
# Location of the installed cppcodec library
INCLUDE_CPPCODEC = /usr/local/include/cppcodec

# Compiler to use
CXX = g++
# Compiler flags
PG_CXXFLAGS = -std=c++17 -fPIC -Wall -Werror -g -O0 -pthread \
       -I$(INCLUDEDIR) -I$(INCLUDE_SEAL) -I$(INCLUDE_CPPCODEC)
#PG_LDFLAGS= -L$(INCLUDE_SEAL_LIB) -lseal -pthread
# Seal linker flags
SEAL_LDFLAGS = -L$(INCLUDE_SEAL_LIB) -lseal -pthread
include $(PGXS)

seal_mean_cxx_v2.so: seal_mean_cxx_v2.o    # Create the .so file
    @echo ""
    @echo "Cereating .so file."
# Needed when checking the linker errors against the external SEAL library
and must be commented when creating .so file
#    $(CXX) -Wl,--no-undefined -shared -o seal_mean_cxx.so seal_mean_cxx.o
$(PG_LDFLAGS) $(SEAL_LDFLAGS)
# Creates the .so file
    $(CXX) -shared -o seal_mean_cxx_v2.so seal_mean_cxx_v2.o $(PG_LDFLAGS)
$(SEAL_LDFLAGS)
    @echo "Done."
    @echo ""
    @echo "Copying the created .so library to \"${POSGRESLIBINSTALL}\"."
# Copies the .so file to PostgreSQL shared libraries
    cp seal_mean_cxx_v2.so $(POSGRESLIBINSTALL)
    @echo "Done."
    @echo ""

seal_mean_cxx_v2.o: seal_mean_cxx_v2.cpp # Create the .o file
    @echo ""
    @echo "Creating .o file."
    $(CXX) $(PG_CXXFLAGS) -o seal_mean_cxx_v2.o -c seal_mean_cxx_v2.cpp
    @echo "Done."

.PHONY = clean
clean: # Clean .so and .o files
    @echo ""
    @echo "Cleaning the .so and .o files"
    rm -f seal_mean_cxx_v2.so rm seal_mean_cxx_v2.o
    @echo "Done."
    @echo ""
 
I get this part for my code in the Makefile:

Makefile:57: warning: overriding recipe for target 'clean'
/usr/pgsql-12/lib/pgxs/src/makefiles/pgxs.mk:342: warning: ignoring old
recipe for target 'clean'

Cleaning the .so and .o files
rm -f seal_mean_cxx_v2.so rm seal_mean_cxx_v2.o
Done.

[root@www seal_mean]# make
Makefile:57: warning: overriding recipe for target 'clean'
/usr/pgsql-12/lib/pgxs/src/makefiles/pgxs.mk:342: warning: ignoring old
recipe for target 'clean'

Creating .o file.
g++ -Wall -Wpointer-arith -Wendif-labels -Wmissing-format-attribute
-Wformat-security -fno-strict-aliasing -fwrapv -O2 -std=c++17 -fPIC -Wall
-Werror -g -O0 -pthread -I/usr/pgsql-12/include/server -I/usr/local/include
-I/usr/local/include/cppcodec -o seal_mean_cxx_v2.o -c seal_mean_cxx_v2.cpp
Done.

Cereating .so file.
g++ -shared -o seal_mean_cxx_v2.so seal_mean_cxx_v2.o -L/usr/pgsql-12/lib 
-L/usr/lib64  -L/usr/lib64 -Wl,--as-needed
-Wl,-rpath,'/usr/pgsql-12/lib',--enable-new-dtags -L/usr/local/lib -lseal
-pthread
Done.

Copying the created .so library to "/usr/pgsql-12/lib".
cp seal_mean_cxx_v2.so /usr/pgsql-12/lib
Done.


Which is good, my seal_mean_cxx_v2.so being created and copied to
/usr/pgsql-12/lib/. But right after that I get this and it doesn't seem to
effect my seal_mean_cxx_v2.so library:
/usr/lib64/ccache/clang -xc++ -Wno-ignored-attributes -fno-strict-aliasing
-fwrapv -O2  -I. -I./ -I/usr/pgsql-12/include/server
-I/usr/pgsql-12/include/internal  -D_GNU_SOURCE -I/usr/include/libxml2 
-I/usr/include -flto=thin -emit-llvm -c -o seal_mean_cxx_v2.bc
seal_mean_cxx_v2.cpp
In file included from seal_mean_cxx_v2.cpp:25:
In file included from /usr/local/include/seal/seal.h:3:
In file included from /usr/local/include/seal/bigpoly.h:9:
In file included from /usr/local/include/seal/biguint.h:6:
In file included from /usr/local/include/seal/memorypoolhandle.h:6:
In file included from /usr/local/include/seal/util/mempool.h:12:
/usr/local/include/seal/util/locks.h:12:50: error: no template named
'shared_mutex' in namespace 'std'; did you mean 'shared_ptr'?
        using ReaderLock = std::shared_lock<std::shared_mutex>;
                                            ~~~~~^
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/shared_ptr.h:103:11:
note: 'shared_ptr' declared here
    class shared_ptr : public __shared_ptr<_Tp>
          ^
In file included from seal_mean_cxx_v2.cpp:25:
In file included from /usr/local/include/seal/seal.h:3:
In file included from /usr/local/include/seal/bigpoly.h:9:
In file included from /usr/local/include/seal/biguint.h:6:
In file included from /usr/local/include/seal/memorypoolhandle.h:6:
In file included from /usr/local/include/seal/util/mempool.h:12:
/usr/local/include/seal/util/locks.h:12:50: error: use of class template
'std::shared_ptr' requires template arguments
        using ReaderLock = std::shared_lock<std::shared_mutex>;
                                                 ^
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/shared_ptr.h:103:11:
note: template is declared here
    class shared_ptr : public __shared_ptr<_Tp>
          ^
In file included from seal_mean_cxx_v2.cpp:25:
In file included from /usr/local/include/seal/seal.h:3:
In file included from /usr/local/include/seal/bigpoly.h:9:
In file included from /usr/local/include/seal/biguint.h:6:
In file included from /usr/local/include/seal/memorypoolhandle.h:6:
In file included from /usr/local/include/seal/util/mempool.h:12:
/usr/local/include/seal/util/locks.h:14:50: error: no template named
'shared_mutex' in namespace 'std'; did you mean 'shared_ptr'?
        using WriterLock = std::unique_lock<std::shared_mutex>;
                                            ~~~~~^
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/shared_ptr.h:103:11:
note: 'shared_ptr' declared here
    class shared_ptr : public __shared_ptr<_Tp>
          ^
In file included from seal_mean_cxx_v2.cpp:25:
In file included from /usr/local/include/seal/seal.h:3:
In file included from /usr/local/include/seal/bigpoly.h:9:
In file included from /usr/local/include/seal/biguint.h:6:
In file included from /usr/local/include/seal/memorypoolhandle.h:6:
In file included from /usr/local/include/seal/util/mempool.h:12:
/usr/local/include/seal/util/locks.h:14:50: error: use of class template
'std::shared_ptr' requires template arguments
        using WriterLock = std::unique_lock<std::shared_mutex>;
                                                 ^
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/shared_ptr.h:103:11:
note: template is declared here
    class shared_ptr : public __shared_ptr<_Tp>
          ^
In file included from seal_mean_cxx_v2.cpp:25:
In file included from /usr/local/include/seal/seal.h:3:
In file included from /usr/local/include/seal/bigpoly.h:9:
In file included from /usr/local/include/seal/biguint.h:6:
In file included from /usr/local/include/seal/memorypoolhandle.h:6:
In file included from /usr/local/include/seal/util/mempool.h:12:
/usr/local/include/seal/util/locks.h:21:20: error: unknown type name
'ReaderLock'
            inline ReaderLock acquire_read()
                   ^
/usr/local/include/seal/util/locks.h:26:20: error: unknown type name
'WriterLock'
            inline WriterLock acquire_write()
                   ^
/usr/local/include/seal/util/locks.h:31:20: error: unknown type name
'ReaderLock'
            inline ReaderLock try_acquire_read()
                   ^
/usr/local/include/seal/util/locks.h:36:20: error: unknown type name
'WriterLock'
            inline WriterLock try_acquire_write()
                   ^
/usr/local/include/seal/util/locks.h:46:18: error: no type named
'shared_mutex' in namespace 'std'
            std::shared_mutex rw_lock_mutex_;
            ~~~~~^
In file included from seal_mean_cxx_v2.cpp:25:
In file included from /usr/local/include/seal/seal.h:3:
In file included from /usr/local/include/seal/bigpoly.h:9:
In file included from /usr/local/include/seal/biguint.h:6:
In file included from /usr/local/include/seal/memorypoolhandle.h:6:
/usr/local/include/seal/util/mempool.h:561:17: error: unknown type name
'ReaderLock'
                ReaderLock lock(pools_locker_.acquire_read());
                ^
In file included from seal_mean_cxx_v2.cpp:25:
In file included from /usr/local/include/seal/seal.h:3:
In file included from /usr/local/include/seal/bigpoly.h:9:
In file included from /usr/local/include/seal/biguint.h:6:
/usr/local/include/seal/memorypoolhandle.h:144:20: error: no matching
conversion for functional-style cast from
'shared_ptr<seal::util::MemoryPoolMT>' to 'seal::MemoryPoolHandle'
            return MemoryPoolHandle(std::make_shared<util::MemoryPoolMT>());
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/seal/memorypoolhandle.h:70:9: note: candidate constructor
not viable: no known conversion from 'shared_ptr<seal::util::MemoryPoolMT>'
to 'const seal::MemoryPoolHandle' for 1st argument
        MemoryPoolHandle(const MemoryPoolHandle ©)
        ^
/usr/local/include/seal/memorypoolhandle.h:81:9: note: candidate constructor
not viable: no known conversion from 'shared_ptr<seal::util::MemoryPoolMT>'
to 'seal::MemoryPoolHandle' for 1st argument
        MemoryPoolHandle(MemoryPoolHandle &&source) noexcept
        ^
/usr/local/include/seal/memorypoolhandle.h:243:9: note: candidate
constructor not viable: no known conversion from
'shared_ptr<seal::util::MemoryPoolMT>' to 'shared_ptr<util::MemoryPool>' for
1st argument
        MemoryPoolHandle(std::shared_ptr<util::MemoryPool> pool) noexcept :
        ^
/usr/local/include/seal/memorypoolhandle.h:61:9: note: candidate constructor
not viable: requires 0 arguments, but 1 was provided
        MemoryPoolHandle() = default;
        ^
11 errors generated.
make: ***
[/usr/pgsql-12/lib/pgxs/src/makefiles/../../src/Makefile.global:1047:
seal_mean_cxx_v2.bc] Error 1

Why does it start executing the following after it did what it was supposed
to do?
/usr/lib64/ccache/clang -xc++ -Wno-ignored-attributes -fno-strict-aliasing
-fwrapv -O2  -I. -I./ -I/usr/pgsql-12/include/server
-I/usr/pgsql-12/include/internal  -D_GNU_SOURCE -I/usr/include/libxml2 
-I/usr/include -flto=thin -emit-llvm -c -o seal_mean_cxx_v2.bc
seal_mean_cxx_v2.cpp


Best regards,
TalGloz



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