Re-include pqsignal() in libpq.

We need this in non-ENABLE_THREAD_SAFETY builds, and also to satisfy
the exports.txt entry; while it might be a good idea to remove the
latter, I'm hesitant to do so except in the context of an intentional
ABI break.  At least we don't have a separately maintained source file
for it anymore.

src/interfaces/libpq/.gitignore

@@ -8,6 +8,7 @@
 /noblock.c
 /open.c
 /pgstrcasecmp.c
+/pqsignal.c
 /snprintf.c
 /strerror.c
 /strlcpy.c

src/interfaces/libpq/Makefile

@@ -35,7 +35,8 @@ OBJS=	fe-auth.o fe-connect.o fe-exec.o fe-misc.o fe-print.o fe-lobj.o \
 	fe-protocol2.o fe-protocol3.o pqexpbuffer.o fe-secure.o \
 	libpq-events.o
 # libpgport C files we always use
-OBJS += chklocale.o inet_net_ntop.o noblock.o pgstrcasecmp.o thread.o
+OBJS += chklocale.o inet_net_ntop.o noblock.o pgstrcasecmp.o pqsignal.o \
+	thread.o
 # libpgport C files that are needed if identified by configure
 OBJS += $(filter crypt.o getaddrinfo.o getpeereid.o inet_aton.o open.o snprintf.o strerror.o strlcpy.o win32error.o win32setlocale.o, $(LIBOBJS))
 # backend/libpq
@@ -81,14 +82,14 @@ include $(top_srcdir)/src/Makefile.shlib
 backend_src = $(top_srcdir)/src/backend
 
 
-# We use several backend modules verbatim, but since we need to
-# compile with appropriate options to build a shared lib, we can't
-# necessarily use the same object files as the backend uses. Instead,
-# symlink the source files in here and build our own object file.
+# We use several libpgport and backend modules verbatim, but since we need
+# to compile with appropriate options to build a shared lib, we can't
+# necessarily use the same object files built for libpgport and the backend.
+# Instead, symlink the source files in here and build our own object files.
 # For some libpgport modules, this only happens if configure decides
 # the module is needed (see filter hack in OBJS, above).
 
-chklocale.c crypt.c getaddrinfo.c getpeereid.c inet_aton.c inet_net_ntop.c noblock.c open.c pgsleep.c pgstrcasecmp.c snprintf.c strerror.c strlcpy.c thread.c win32error.c win32setlocale.c: % : $(top_srcdir)/src/port/%
+chklocale.c crypt.c getaddrinfo.c getpeereid.c inet_aton.c inet_net_ntop.c noblock.c open.c pgsleep.c pgstrcasecmp.c pqsignal.c snprintf.c strerror.c strlcpy.c thread.c win32error.c win32setlocale.c: % : $(top_srcdir)/src/port/%
 	rm -f $@ && $(LN_S) $< .
 
 ip.c md5.c: % : $(backend_src)/libpq/%
@@ -139,7 +140,7 @@ clean distclean: clean-lib
 	rm -f $(OBJS) pthread.h libpq.rc
 # Might be left over from a Win32 client-only build
 	rm -f pg_config_paths.h
-	rm -f inet_net_ntop.c noblock.c pgstrcasecmp.c thread.c
+	rm -f inet_net_ntop.c noblock.c pgstrcasecmp.c pqsignal.c thread.c
 	rm -f chklocale.c crypt.c getaddrinfo.c getpeereid.c inet_aton.c open.c snprintf.c strerror.c strlcpy.c win32error.c win32setlocale.c
 	rm -f pgsleep.c
 	rm -f md5.c ip.c

src/interfaces/libpq/bcc32.mak

@@ -76,6 +76,7 @@ ALL : config "$(OUTDIR)" "$(OUTDIR)\blibpq.dll" "$(OUTDIR)\blibpq.lib"
 CLEAN :
 	-@erase "$(INTDIR)\getaddrinfo.obj"
 	-@erase "$(INTDIR)\pgstrcasecmp.obj"
+	-@erase "$(INTDIR)\pqsignal.obj"
 	-@erase "$(INTDIR)\thread.obj"
 	-@erase "$(INTDIR)\inet_aton.obj"
 	-@erase "$(INTDIR)\crypt.obj"
@@ -120,6 +121,7 @@ LIB32_OBJS= \
 	"$(INTDIR)\win32.obj" \
 	"$(INTDIR)\getaddrinfo.obj" \
 	"$(INTDIR)\pgstrcasecmp.obj" \
+	"$(INTDIR)\pqsignal.obj" \
 	"$(INTDIR)\thread.obj" \
 	"$(INTDIR)\inet_aton.obj" \
 	"$(INTDIR)\crypt.obj" \
@@ -207,6 +209,11 @@ LINK32_FLAGS = -Gn -L$(BCB)\lib;$(INTDIR); -x -Tpd -v
 	$(CPP_PROJ) ..\..\port\pgstrcasecmp.c
 <<
 
+"$(INTDIR)\pqsignal.obj" : ..\..\port\pqsignal.c
+	$(CPP) @<<
+	$(CPP_PROJ) ..\..\port\pqsignal.c
+<<
+
 "$(INTDIR)\thread.obj" : ..\..\port\thread.c
 	$(CPP) @<<
 	$(CPP_PROJ) ..\..\port\thread.c

src/interfaces/libpq/win32.mak

@@ -83,6 +83,7 @@ ALL : config "$(OUTDIR)\$(OUTFILENAME).lib" "$(OUTDIR)\$(OUTFILENAME).dll"
 CLEAN :
 	-@erase "$(INTDIR)\getaddrinfo.obj"
 	-@erase "$(INTDIR)\pgstrcasecmp.obj"
+	-@erase "$(INTDIR)\pqsignal.obj"
 	-@erase "$(INTDIR)\thread.obj"
 	-@erase "$(INTDIR)\inet_aton.obj"
 	-@erase "$(INTDIR)\crypt.obj"
@@ -130,6 +131,7 @@ LIB32_OBJS= \
 	"$(INTDIR)\win32.obj" \
 	"$(INTDIR)\getaddrinfo.obj" \
 	"$(INTDIR)\pgstrcasecmp.obj" \
+	"$(INTDIR)\pqsignal.obj" \
 	"$(INTDIR)\thread.obj" \
 	"$(INTDIR)\inet_aton.obj" \
 	"$(INTDIR)\crypt.obj" \
@@ -247,6 +249,11 @@ LINK32_OBJS= \
 	$(CPP_PROJ) ..\..\port\pgstrcasecmp.c
 <<
 
+"$(INTDIR)\pqsignal.obj" : ..\..\port\pqsignal.c
+	$(CPP) @<<
+	$(CPP_PROJ) ..\..\port\pqsignal.c
+<<
+
 "$(INTDIR)\thread.obj" : ..\..\port\thread.c
 	$(CPP) @<<
 	$(CPP_PROJ) ..\..\port\thread.c