Combine headerscheck and cpluspluscheck scripts

From 097e135bc421af98dc6298510d4cb4d8d778e3fe Mon Sep 17 00:00:00 2001
From: Peter Eisentraut <peter@eisentraut.org>
Date: Wed, 7 Feb 2024 16:22:07 +0100
Subject: [PATCH] Combine headerscheck and cpluspluscheck scripts

They are mostly the same, and it is tedious to maintain two copies of
essentially the same exclude list.  headerscheck now has a new option
--cplusplus to select the cpluspluscheck functionality.  The top-level
make targets are still the same.
---
 GNUmakefile.in                     |   2 +-
 src/tools/pginclude/cpluspluscheck | 227 -----------------------------
 src/tools/pginclude/headerscheck   |  57 +++++++-
 3 files changed, 54 insertions(+), 232 deletions(-)
 delete mode 100755 src/tools/pginclude/cpluspluscheck

diff --git a/GNUmakefile.in b/GNUmakefile.in
index eba569e930e..4d8fc794bbb 100644
--- a/GNUmakefile.in
+++ b/GNUmakefile.in
@@ -133,6 +133,6 @@ headerscheck: submake-generated-headers
 	$(top_srcdir)/src/tools/pginclude/headerscheck $(top_srcdir) $(abs_top_builddir)
 
 cpluspluscheck: submake-generated-headers
-	$(top_srcdir)/src/tools/pginclude/cpluspluscheck $(top_srcdir) $(abs_top_builddir)
+	$(top_srcdir)/src/tools/pginclude/headerscheck --cplusplus $(top_srcdir) $(abs_top_builddir)
 
 .PHONY: dist distdir distcheck docs install-docs world check-world install-world installcheck-world headerscheck cpluspluscheck
diff --git a/src/tools/pginclude/cpluspluscheck b/src/tools/pginclude/cpluspluscheck
deleted file mode 100755
index 7edfc44b49a..00000000000
--- a/src/tools/pginclude/cpluspluscheck
+++ /dev/null
@@ -1,227 +0,0 @@
-#!/bin/sh
-
-# Check (almost) all PostgreSQL include files for C++ compatibility.
-#
-# Argument 1 is the top-level source directory, argument 2 the
-# top-level build directory (they might be the same). If not set, they
-# default to the current directory.
-#
-# Needs to be run after configuring and creating all generated headers.
-# It's advisable to configure --with-perl --with-python, else you're
-# likely to get errors from associated headers.
-#
-# No output if everything is OK, else compiler errors.
-#
-# src/tools/pginclude/cpluspluscheck
-# Copyright (c) 2009-2024, PostgreSQL Global Development Group
-
-if [ -z "$1" ]; then
-    srcdir="."
-else
-    srcdir="$1"
-fi
-
-if [ -z "$2" ]; then
-    builddir="."
-else
-    builddir="$2"
-fi
-
-me=`basename $0`
-
-# These switches are g++ specific, you may override if necessary.
-CXXFLAGS=${CXXFLAGS:- -fsyntax-only -Wall}
-
-# Pull some info from configure's results.
-MGLOB="$builddir/src/Makefile.global"
-CPPFLAGS=`sed -n 's/^CPPFLAGS[ 	]*=[ 	]*//p' "$MGLOB"`
-CXX=`sed -n 's/^CXX[ 	]*=[ 	]*//p' "$MGLOB"`
-perl_includespec=`sed -n 's/^perl_includespec[ 	]*=[ 	]*//p' "$MGLOB"`
-python_includespec=`sed -n 's/^python_includespec[ 	]*=[ 	]*//p' "$MGLOB"`
-
-# Extract any -I and -D switches from CPPFLAGS.
-# (If necessary, user can pass more switches by presetting EXTRAFLAGS.)
-for flag in $CPPFLAGS; do
-  case $flag in
-    -I*|-D*) EXTRAFLAGS="$EXTRAFLAGS $flag";;
-  esac
-done
-
-# Create temp directory.
-tmp=`mktemp -d /tmp/$me.XXXXXX`
-
-trap "ret=$?; rm -rf $tmp; exit $ret" 0 1 2 3 15
-
-exit_status=0
-
-# Scan all of src/ and contrib/ for header files.
-for f in `cd "$srcdir" && find src contrib -name '*.h' -print`
-do
-	# Ignore files that are unportable or intentionally not standalone.
-
-	# These files are platform-specific, and c.h will include the
-	# one that's relevant for our current platform anyway.
-	test "$f" = src/include/port/aix.h && continue
-	test "$f" = src/include/port/cygwin.h && continue
-	test "$f" = src/include/port/darwin.h && continue
-	test "$f" = src/include/port/freebsd.h && continue
-	test "$f" = src/include/port/linux.h && continue
-	test "$f" = src/include/port/netbsd.h && continue
-	test "$f" = src/include/port/openbsd.h && continue
-	test "$f" = src/include/port/solaris.h && continue
-	test "$f" = src/include/port/win32.h && continue
-
-	# Additional Windows-specific headers.
-	test "$f" = src/include/port/win32_port.h && continue
-	test "$f" = src/include/port/win32/netdb.h && continue
-	test "$f" = src/include/port/win32/sys/resource.h && continue
-	test "$f" = src/include/port/win32/sys/socket.h && continue
-	test "$f" = src/include/port/win32_msvc/dirent.h && continue
-	test "$f" = src/include/port/win32_msvc/utime.h && continue
-	test "$f" = src/include/port/win32ntdll.h && continue
-	test "$f" = src/port/pthread-win32.h && continue
-
-	# Likewise, these files are platform-specific, and the one
-	# relevant to our platform will be included by atomics.h.
-	test "$f" = src/include/port/atomics/arch-arm.h && continue
-	test "$f" = src/include/port/atomics/arch-hppa.h && continue
-	test "$f" = src/include/port/atomics/arch-ppc.h && continue
-	test "$f" = src/include/port/atomics/arch-x86.h && continue
-	test "$f" = src/include/port/atomics/fallback.h && continue
-	test "$f" = src/include/port/atomics/generic.h && continue
-	test "$f" = src/include/port/atomics/generic-acc.h && continue
-	test "$f" = src/include/port/atomics/generic-gcc.h && continue
-	test "$f" = src/include/port/atomics/generic-msvc.h && continue
-	test "$f" = src/include/port/atomics/generic-sunpro.h && continue
-
-	# sepgsql.h depends on headers that aren't there on most platforms.
-	test "$f" = contrib/sepgsql/sepgsql.h && continue
-
-	# nodetags.h cannot be included standalone: it's just a code fragment.
-	test "$f" = src/include/nodes/nodetags.h && continue
-	test "$f" = src/backend/nodes/nodetags.h && continue
-
-	# These files are not meant to be included standalone, because
-	# they contain lists that might have multiple use-cases.
-	test "$f" = src/include/access/rmgrlist.h && continue
-	test "$f" = src/include/parser/kwlist.h && continue
-	test "$f" = src/pl/plpgsql/src/pl_reserved_kwlist.h && continue
-	test "$f" = src/pl/plpgsql/src/pl_unreserved_kwlist.h && continue
-	test "$f" = src/interfaces/ecpg/preproc/c_kwlist.h && continue
-	test "$f" = src/interfaces/ecpg/preproc/ecpg_kwlist.h && continue
-	test "$f" = src/include/regex/regerrs.h && continue
-	test "$f" = src/include/tcop/cmdtaglist.h && continue
-	test "$f" = src/pl/plpgsql/src/plerrcodes.h && continue
-	test "$f" = src/pl/plpython/spiexceptions.h && continue
-	test "$f" = src/pl/tcl/pltclerrcodes.h && continue
-
-	# Also not meant to be included standalone.
-	test "$f" = src/include/common/unicode_nonspacing_table.h && continue
-	test "$f" = src/include/common/unicode_east_asian_fw_table.h && continue
-
-	test "$f" = src/backend/catalog/syscache_ids.h && continue
-	test "$f" = src/backend/catalog/syscache_info.h && continue
-	test "$f" = src/include/catalog/syscache_ids.h && continue
-	test "$f" = src/include/catalog/syscache_info.h && continue
-
-	# We can't make these Bison output files compilable standalone
-	# without using "%code require", which old Bison versions lack.
-	# parser/gram.h will be included by parser/gramparse.h anyway.
-	test "$f" = contrib/cube/cubeparse.h && continue
-	test "$f" = contrib/seg/segparse.h && continue
-	test "$f" = src/backend/bootstrap/bootparse.h && continue
-	test "$f" = src/backend/parser/gram.h && continue
-	test "$f" = src/backend/replication/repl_gram.h && continue
-	test "$f" = src/backend/replication/syncrep_gram.h && continue
-	test "$f" = src/backend/utils/adt/jsonpath_gram.h && continue
-	test "$f" = src/bin/pgbench/exprparse.h && continue
-	test "$f" = src/pl/plpgsql/src/pl_gram.h && continue
-	test "$f" = src/interfaces/ecpg/preproc/preproc.h && continue
-	test "$f" = src/test/isolation/specparse.h && continue
-
-	# ppport.h is not under our control, so we can't make it standalone.
-	test "$f" = src/pl/plperl/ppport.h && continue
-
-	# regression.h is not actually C, but ECPG code.
-	test "$f" = src/interfaces/ecpg/test/regression.h && continue
-	# printf_hack.h produces "unused function" warnings.
-	test "$f" = src/interfaces/ecpg/test/printf_hack.h && continue
-
-	# pg_trace.h and utils/probes.h can include sys/sdt.h from SystemTap,
-	# which itself contains C++ code and so won't compile with a C++
-	# compiler under extern "C" linkage.
-	test "$f" = src/include/pg_trace.h && continue
-	test "$f" = src/include/utils/probes.h && continue
-
-	# pg_dump is not C++-clean because it uses "public" and "namespace"
-	# as field names, which is unfortunate but we won't change it now.
-	test "$f" = src/bin/pg_dump/compress_gzip.h && continue
-	test "$f" = src/bin/pg_dump/compress_io.h && continue
-	test "$f" = src/bin/pg_dump/compress_lz4.h && continue
-	test "$f" = src/bin/pg_dump/compress_none.h && continue
-	test "$f" = src/bin/pg_dump/compress_zstd.h && continue
-	test "$f" = src/bin/pg_dump/parallel.h && continue
-	test "$f" = src/bin/pg_dump/pg_backup_archiver.h && continue
-	test "$f" = src/bin/pg_dump/pg_dump.h && continue
-
-	# OK, create .c file to include this .h file.
-	{
-	    echo 'extern "C" {'
-	    # Ideally we'd pre-include only the appropriate one of
-	    # postgres.h, postgres_fe.h, or c.h.  We don't always have enough
-	    # info to guess which, but in some subdirectories there's a
-	    # reasonable choice to make, and otherwise we use postgres.h.
-	    # Also, those three files should compile with no pre-include, as
-	    # should src/interfaces headers meant to be exposed to clients.
-	    case "$f" in
-		src/include/postgres.h) ;;
-		src/include/postgres_fe.h) ;;
-		src/include/c.h) ;;
-		src/interfaces/libpq/libpq-fe.h) ;;
-		src/interfaces/libpq/libpq-events.h) ;;
-		src/interfaces/ecpg/ecpglib/ecpglib_extern.h)
-		    echo '#include "postgres_fe.h"' ;;
-		src/interfaces/ecpg/ecpglib/*) ;;
-		src/interfaces/*)
-		    echo '#include "postgres_fe.h"' ;;
-		src/bin/*)
-		    echo '#include "postgres_fe.h"' ;;
-		src/fe_utils/*)
-		    echo '#include "postgres_fe.h"' ;;
-		src/port/*) ;;
-		src/common/*)
-		    echo '#include "c.h"' ;;
-		*)
-		    echo '#include "postgres.h"' ;;
-	    esac
-	    echo "#include \"$f\""
-	    echo '};'
-	} >$tmp/test.cpp
-
-	# Some subdirectories need extra -I switches.
-	case "$f" in
-	    src/pl/plperl/*)
-		EXTRAINCLUDES="$perl_includespec" ;;
-	    src/pl/plpython/*)
-		EXTRAINCLUDES="$python_includespec" ;;
-	    src/interfaces/ecpg/*)
-		EXTRAINCLUDES="-I $builddir/src/interfaces/ecpg/include -I $srcdir/src/interfaces/ecpg/include" ;;
-	    src/backend/parser/*)
-		EXTRAINCLUDES="-I $builddir/src/backend/parser/" ;;
-	    src/backend/utils/adt/*)
-		EXTRAINCLUDES="-I $builddir/src/backend/utils/adt/" ;;
-	    *)
-		EXTRAINCLUDES="" ;;
-	esac
-
-	# Run the test.
-	if ! ${CXX:-g++} -I $builddir -I $srcdir \
-		-I $builddir/src/include -I $srcdir/src/include \
-		-I $builddir/src/interfaces/libpq -I $srcdir/src/interfaces/libpq \
-		$EXTRAINCLUDES $EXTRAFLAGS $CXXFLAGS -c $tmp/test.cpp
-	then
-		exit_status=1
-	fi
-done
-
-exit $exit_status
diff --git a/src/tools/pginclude/headerscheck b/src/tools/pginclude/headerscheck
index 84b892b5c51..ccdd689ebe9 100755
--- a/src/tools/pginclude/headerscheck
+++ b/src/tools/pginclude/headerscheck
@@ -15,6 +15,13 @@
 # src/tools/pginclude/headerscheck
 # Copyright (c) 2009-2024, PostgreSQL Global Development Group
 
+if [ "$1" = "--cplusplus" ]; then
+	cplusplus=true
+	shift
+else
+	cplusplus=false
+fi
+
 if [ -z "$1" ]; then
     srcdir="."
 else
@@ -29,11 +36,15 @@ fi
 
 me=`basename $0`
 
+# These switches are g++ specific, you may override if necessary.
+CXXFLAGS=${CXXFLAGS:- -fsyntax-only -Wall}
+
 # Pull some info from configure's results.
 MGLOB="$builddir/src/Makefile.global"
 CPPFLAGS=`sed -n 's/^CPPFLAGS[ 	]*=[ 	]*//p' "$MGLOB"`
 CFLAGS=`sed -n 's/^CFLAGS[ 	]*=[ 	]*//p' "$MGLOB"`
 CC=`sed -n 's/^CC[ 	]*=[ 	]*//p' "$MGLOB"`
+CXX=`sed -n 's/^CXX[ 	]*=[ 	]*//p' "$MGLOB"`
 PG_SYSROOT=`sed -n 's/^PG_SYSROOT[ 	]*=[ 	]*//p' "$MGLOB"`
 perl_includespec=`sed -n 's/^perl_includespec[ 	]*=[ 	]*//p' "$MGLOB"`
 python_includespec=`sed -n 's/^python_includespec[ 	]*=[ 	]*//p' "$MGLOB"`
@@ -43,6 +54,22 @@ CPPFLAGS=`echo "$CPPFLAGS" | sed "s|\\\$(PG_SYSROOT)|$PG_SYSROOT|g"`
 
 # (EXTRAFLAGS is not set here, but user can pass it in if need be.)
 
+if $cplusplus; then
+	ext=cpp
+	COMPILER=${CXX:-g++}
+	# Extract any -I and -D switches from CPPFLAGS.
+	for flag in $CPPFLAGS; do
+	  case $flag in
+	    -I*|-D*) CXXPPFLAGS="$CXXPPFLAGS $flag";;
+	  esac
+	done
+	COMPILER_FLAGS="$CXXPPFLAGS $CXXFLAGS"
+else
+	ext=c
+	COMPILER=${CC:-gcc}
+	COMPILER_FLAGS="$CPPFLAGS $CFLAGS"
+fi
+
 # Create temp directory.
 tmp=`mktemp -d /tmp/$me.XXXXXX`
 
@@ -70,6 +97,7 @@ do
 	# Additional Windows-specific headers.
 	test "$f" = src/include/port/win32_port.h && continue
 	test "$f" = src/include/port/win32/netdb.h && continue
+	$cplusplus && test "$f" = src/include/port/win32/sys/resource.h && continue
 	test "$f" = src/include/port/win32/sys/socket.h && continue
 	test "$f" = src/include/port/win32_msvc/dirent.h && continue
 	test "$f" = src/include/port/win32_msvc/utime.h && continue
@@ -135,7 +163,7 @@ do
 	test "$f" = src/test/isolation/specparse.h && continue
 
 	# This produces a "no previous prototype" warning.
-	test "$f" = src/include/storage/checksum_impl.h && continue
+	! $cplusplus && test "$f" = src/include/storage/checksum_impl.h && continue
 
 	# ppport.h is not under our control, so we can't make it standalone.
 	test "$f" = src/pl/plperl/ppport.h && continue
@@ -145,8 +173,28 @@ do
 	# printf_hack.h produces "unused function" warnings.
 	test "$f" = src/interfaces/ecpg/test/printf_hack.h && continue
 
+	if $cplusplus; then
+		# pg_trace.h and utils/probes.h can include sys/sdt.h from SystemTap,
+		# which itself contains C++ code and so won't compile with a C++
+		# compiler under extern "C" linkage.
+		test "$f" = src/include/pg_trace.h && continue
+		test "$f" = src/include/utils/probes.h && continue
+
+		# pg_dump is not C++-clean because it uses "public" and "namespace"
+		# as field names, which is unfortunate but we won't change it now.
+		test "$f" = src/bin/pg_dump/compress_gzip.h && continue
+		test "$f" = src/bin/pg_dump/compress_io.h && continue
+		test "$f" = src/bin/pg_dump/compress_lz4.h && continue
+		test "$f" = src/bin/pg_dump/compress_none.h && continue
+		test "$f" = src/bin/pg_dump/compress_zstd.h && continue
+		test "$f" = src/bin/pg_dump/parallel.h && continue
+		test "$f" = src/bin/pg_dump/pg_backup_archiver.h && continue
+		test "$f" = src/bin/pg_dump/pg_dump.h && continue
+	fi
+
 	# OK, create .c file to include this .h file.
 	{
+	    $cplusplus && echo 'extern "C" {'
 	    # Ideally we'd pre-include only the appropriate one of
 	    # postgres.h, postgres_fe.h, or c.h.  We don't always have enough
 	    # info to guess which, but in some subdirectories there's a
@@ -175,7 +223,8 @@ do
 		    echo '#include "postgres.h"' ;;
 	    esac
 	    echo "#include \"$f\""
-	} >$tmp/test.c
+	    $cplusplus && echo '};'
+	} >$tmp/test.$ext
 
 	# Some subdirectories need extra -I switches.
 	case "$f" in
@@ -194,10 +243,10 @@ do
 	esac
 
 	# Run the test.
-	if ! ${CC:-gcc} $CPPFLAGS $CFLAGS -I $builddir -I $srcdir \
+	if ! $COMPILER $COMPILER_FLAGS -I $builddir -I $srcdir \
 		-I $builddir/src/include -I $srcdir/src/include \
 		-I $builddir/src/interfaces/libpq -I $srcdir/src/interfaces/libpq \
-		$EXTRAINCLUDES $EXTRAFLAGS -c $tmp/test.c -o $tmp/test.o
+		$EXTRAINCLUDES $EXTRAFLAGS -c $tmp/test.$ext -o $tmp/test.o
 	then
 		exit_status=1
 	fi
-- 
2.43.0