[#28914] YSQL: link postgres's excutables with CXX instead of CC

Summary:
There are multiple postgres's executable linked with various YB libraries (`-lyb_pggate_util` `-lyb_pggate`). These libraries are linked dynamically.

In case of running such executables built in `ASAN` mode the `symbol lookup` error like the following may occur:

```
[2025-10-01T23:49:31.377Z] [m-1] W1001 23:49:25.568262 371043 subprocess.cc:210] [initdb] /share/jenkins/workspace/yugabyte-db-phabricator/yugabyte-db/build/asan-clang19-dynamic-ninja/postgres/bin/initdb: symbol lookup error: /opt/yb-build/thirdparty/yugabyte-db-thirdparty-v20250812204937-6c7155ea61-almalinux9-x86_64-clang19/installed/asan/lib/libprotobuf.so.32: undefined symbol: __ubsan_vptr_type_cache
```

The root cause of such error is that there is no `__ubsan_vptr_type_cache` function in executable while dynamically library use it. This function is added/used when executable/library is build (linked) with the `-fsanitize` flag.

In spite of the fact postgres executables uses same set of flags (including `-fsanitize`) for building like YB's C++ library C and C++ compilers process them in different way (i.e. uses different set of auxiliary functions).

To solve the issue it is required to use C++ for linking instead of C for executables which may load instrumented dynamic libraries build with C++.

This approach is already used for `postgres` executable:

```
...
CCLD = $(CXX)
...
postgres: $(OBJS)
	$(CCLD) $(CFLAGS) $(call expand_subsys,$^) $(LDFLAGS) $(LDFLAGS_EX) $(export_dynamic) $(LIBS) -o $@
...
```

This diff spreads same approach on all executables which are linked (i.e. adds `-lyb_pggate*`) against YB's libraries in `Makefile`.
Jira: DB-18637

Test Plan: Jenkins

Reviewers: fizaa, pjain, myang, kramanathan, jason

Reviewed By: jason

Subscribers: jason, yql

Tags: #jenkins-ready

Differential Revision: https://phorge.dev.yugabyte.com/D47153

Author: d-uspenskiy

src/postgres/src/Makefile.global.in

@@ -274,6 +274,8 @@ LLVM_CPPFLAGS = @LLVM_CPPFLAGS@
 LLVM_CFLAGS = @LLVM_CFLAGS@
 LLVM_CXXFLAGS = @LLVM_CXXFLAGS@
 
+YB_CCLD = @CXX@
+
 # Kind-of compilers
 
 BISON = @BISON@
@@ -828,7 +830,7 @@ endif
 # since we put -l switches into LDFLAGS and those are order-sensitive.
 # In addition, include CFLAGS and LDFLAGS_EX per project conventions.
 %: %.o
-	$(CC) $(CFLAGS) $^ $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@$(X)
+	$(YB_CCLD) $(CFLAGS) $^ $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@$(X)
 
 ifndef PGXS
 

src/postgres/src/backend/Makefile

@@ -62,8 +62,6 @@ endif
 # later, after initializing SHLIB_LINK.
 LIBS += -L$(YB_BUILD_ROOT)/lib -lyb_util -lyb_pggate -lyb_pggate_util
 
-CCLD = $(CXX)
-
 # Shared library configuration (see Makefile_ybpostgres.shlib -- included below)
 PGFILEDESC = "Postgres shared library"
 NAME = yb_pgbackend
@@ -103,7 +101,7 @@ ifneq ($(PORTNAME), win32)
 ifneq ($(PORTNAME), aix)
 
 postgres: $(OBJS)
-	$(CCLD) $(CFLAGS) $(call expand_subsys,$^) $(LDFLAGS) $(LDFLAGS_EX) $(export_dynamic) $(LIBS) -o $@
+	$(YB_CCLD) $(CFLAGS) $(call expand_subsys,$^) $(LDFLAGS) $(LDFLAGS_EX) $(export_dynamic) $(LIBS) -o $@
 
 endif
 endif
@@ -112,7 +110,7 @@ endif
 ifeq ($(PORTNAME), cygwin)
 
 postgres: $(OBJS)
-	$(CCLD) $(CFLAGS) $(call expand_subsys,$^) $(LDFLAGS) $(LDFLAGS_EX) $(export_dynamic) -Wl,--stack,$(WIN32_STACK_RLIMIT) -Wl,--export-all-symbols -Wl,--out-implib=libpostgres.a $(LIBS) -o $@
+	$(YB_CCLD) $(CFLAGS) $(call expand_subsys,$^) $(LDFLAGS) $(LDFLAGS_EX) $(export_dynamic) -Wl,--stack,$(WIN32_STACK_RLIMIT) -Wl,--export-all-symbols -Wl,--out-implib=libpostgres.a $(LIBS) -o $@
 
 # libpostgres.a is actually built in the preceding rule, but we need this to
 # ensure it's newer than postgres; see notes in src/backend/parser/Makefile
@@ -125,7 +123,7 @@ ifeq ($(PORTNAME), win32)
 LIBS += -lsecur32
 
 postgres: $(OBJS) $(WIN32RES)
-	$(CCLD) $(CFLAGS) $(call expand_subsys,$(OBJS)) $(WIN32RES) $(LDFLAGS) $(LDFLAGS_EX) -Wl,--stack=$(WIN32_STACK_RLIMIT) -Wl,--export-all-symbols -Wl,--out-implib=libpostgres.a $(LIBS) -o $@$(X)
+	$(YB_CCLD) $(CFLAGS) $(call expand_subsys,$(OBJS)) $(WIN32RES) $(LDFLAGS) $(LDFLAGS_EX) -Wl,--stack=$(WIN32_STACK_RLIMIT) -Wl,--export-all-symbols -Wl,--out-implib=libpostgres.a $(LIBS) -o $@$(X)
 
 # libpostgres.a is actually built in the preceding rule, but we need this to
 # ensure it's newer than postgres; see notes in src/backend/parser/Makefile
@@ -137,7 +135,7 @@ endif # win32
 ifeq ($(PORTNAME), aix)
 
 postgres: $(POSTGRES_IMP)
-	$(CCLD) $(CFLAGS) $(call expand_subsys,$(OBJS)) $(LDFLAGS) $(LDFLAGS_EX) -Wl,-bE:$(top_builddir)/src/backend/$(POSTGRES_IMP) $(LIBS) -Wl,-brtllib -o $@
+	$(YB_CCLD) $(CFLAGS) $(call expand_subsys,$(OBJS)) $(LDFLAGS) $(LDFLAGS_EX) -Wl,-bE:$(top_builddir)/src/backend/$(POSTGRES_IMP) $(LIBS) -Wl,-brtllib -o $@
 
 $(POSTGRES_IMP): $(OBJS)
 	$(LD) $(LDREL) $(LDOUT) SUBSYS.o $(call expand_subsys,$^)

src/postgres/src/bin/initdb/Makefile

@@ -49,7 +49,7 @@ OBJS = \
 all: initdb
 
 initdb: $(OBJS) | submake-libpq submake-libpgport submake-libpgfeutils
-	$(CC) $(CFLAGS) $(OBJS) $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@$(X)
+	$(YB_CCLD) $(CLAGS) $(OBJS) $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@$(X)
 
 # We must pull in localtime.c from src/timezones
 localtime.c: % : $(top_srcdir)/src/timezone/%

src/postgres/src/bin/pg_dump/Makefile

@@ -44,13 +44,13 @@ LIBS += -L$(YB_BUILD_ROOT)/lib -lyb_util $(YB_PG_EXE_LD_FLAGS_AFTER_YB_LIBS)
 all: ysql_dump pg_restore ysql_dumpall
 
 ysql_dump: pg_dump.o common.o pg_dump_sort.o $(OBJS) | submake-libpq submake-libpgport submake-libpgfeutils
-	$(CC) $(CFLAGS) pg_dump.o common.o pg_dump_sort.o $(OBJS) $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@$(X)
+	$(YB_CCLD) $(CFLAGS) pg_dump.o common.o pg_dump_sort.o $(OBJS) $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@$(X)
 
 pg_restore: pg_restore.o $(OBJS) | submake-libpq submake-libpgport submake-libpgfeutils
-	$(CC) $(CFLAGS) pg_restore.o $(OBJS) $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@$(X)
+	$(YB_CCLD) $(CFLAGS) pg_restore.o $(OBJS) $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@$(X)
 
 ysql_dumpall: pg_dumpall.o dumputils.o $(WIN32RES) | submake-libpq submake-libpgport submake-libpgfeutils
-	$(CC) $(CFLAGS) pg_dumpall.o dumputils.o $(WIN32RES) $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@$(X)
+	$(YB_CCLD) $(CFLAGS) pg_dumpall.o dumputils.o $(WIN32RES) $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@$(X)
 
 install: all installdirs
 	$(INSTALL_PROGRAM) ysql_dump$(X) '$(DESTDIR)$(bindir)'/ysql_dump$(X)

src/postgres/src/bin/pgbench/Makefile

@@ -24,7 +24,7 @@ LIBS += $(PTHREAD_LIBS) -lyb_util $(YB_PG_EXE_LD_FLAGS_AFTER_YB_LIBS)
 all: ysql_bench
 
 ysql_bench: $(OBJS) | submake-libpq submake-libpgport submake-libpgfeutils
-	$(CC) $(CFLAGS) $^ $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@$(X)
+	$(YB_CCLD) $(CFLAGS) $^ $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@$(X)
 
 # exprscan is compiled as part of exprparse
 exprparse.o: exprscan.c

src/postgres/src/makefiles/pgxs.mk

@@ -472,5 +472,5 @@ endif
 
 ifdef PROGRAM
 $(PROGRAM): $(OBJS)
-	$(CC) $(CFLAGS) $(OBJS) $(PG_LIBS_INTERNAL) $(LDFLAGS) $(LDFLAGS_EX) $(PG_LIBS) $(LIBS) -o $@$(X)
+	$(YB_CCLD) $(CFLAGS) $(OBJS) $(PG_LIBS_INTERNAL) $(LDFLAGS) $(LDFLAGS_EX) $(PG_LIBS) $(LIBS) -o $@$(X)
 endif