Support installation of binaries

Close #10.

    new file:   Makefile
    new file:   Makefile.common
    modified:   check.cmd
    new file:   include/os2compat/dirent.h
    new file:   include/os2compat/net/if.h
    new file:   include/os2compat/netdb.h
    new file:   include/os2compat/poll.h
    new file:   include/os2compat/semaphore.h
    new file:   include/os2compat/sys/mman.h
    new file:   include/os2compat/sys/socket.h
    new file:   include/os2compat/sys/xpoll.h

Makefile

@@ -0,0 +1,200 @@
+#
+#   Configuration parts of GNU Make/GCC build system.
+#   Copyright (C) 2022 by KO Myung-Hun <[email protected]>
+#
+#   This file is part of GNU Make/GCC build system.
+#
+#   This program is free software. It comes without any warranty, to
+#   the extent permitted by applicable law. You can redistribute it
+#   and/or modify it under the terms of the Do What The Fuck You Want
+#   To Public License, Version 2, as published by Sam Hocevar. See
+#   http://www.wtfpl.net/ for more details.
+#
+
+##### Configuration parts that you can modify
+
+# specify sub directories
+SUBDIRS :=
+
+# specify gcc compiler flags for all the programs
+CFLAGS := -Wall -DOS2EMX_PLAIN_CHAR -funsigned-char -O3
+
+# specify g++ compiler flags for all the programs
+CXXFLAGS := -Wall -DOS2EMX_PLAIN_CHAR -funsigned-char -O3
+
+# specify linker flags such as -L option for all the programs
+LDFLAGS :=
+
+# specify dependent libraries such as -l option for all the programs
+LDLIBS :=
+
+ifdef RELEASE
+# specify flags for release mode
+CFLAGS   +=
+CXXFLAGS +=
+LDFLAGS  +=
+else
+# specify flags for debug mode
+CFLAGS   +=
+CXXFLAGS +=
+LDFLAGS  +=
+endif
+
+# specify resource compiler, default is rc if not set
+RC :=
+
+# specify resource compiler flags
+RCFLAGS :=
+
+# set if you want not to compress resources
+NO_COMPRESS_RES :=
+
+# specify BLDLEVEL VENDOR string
+BLDLEVEL_VENDOR := OS/2 Factory
+
+# specify a macro defining version, and a file including that macro
+# to generate BLDLEVEL version string
+BLDLEVEL_VERSION_MACRO :=
+BLDLEVEL_VERSION_FILE :=
+
+# specify BLDLEVEL VERSION string if you want to set VERSION string manually,
+# default is generated with BLDLEVEL_VERSION_MACRO and BLDLEVEL_VERSION_FILE
+# if unset
+BLDLEVEL_VERSION := $(shell date +%y.%m.%d)
+
+# Variables for programs
+#
+# 1. specify a list of programs without an extension with
+#
+#   BIN_PROGRAMS
+#
+# Now, assume
+#
+#   BIN_PROGRAMS := program
+#
+# 2. specify sources for a specific program with
+#
+#   program_SRCS
+#
+# the above is REQUIRED
+#
+# 3. specify various OPTIONAL flags for a specific program with
+#
+#   program_CFLAGS      for gcc compiler flags
+#   program_CXXFLAGS    for g++ compiler flags
+#   program_LDFLAGS     for linker flags
+#   program_LDLIBS      for dependent libraries
+#   program_RCSRC       for rc source
+#   program_RCFLAGS     for rc flags
+#   program_DEF         for .def file
+#   program_EXTRADEPS   for extra dependencies
+#   program_DESC        for a BLDLEVEL description string
+#   program_OUTDIR      for the place where to store .EXE
+
+BIN_PROGRAMS :=
+
+# Variables for libraries
+#
+# 1. specify a list of libraries without an extension with
+#
+#   BIN_LIBRARIES
+#
+# Now, assume
+#
+#   BIN_LIBRARIES := library
+#
+# 2. specify sources for a specific library with
+#
+#   library_SRCS
+#
+# the above is REQUIRED
+#
+# 3. set library type flags for a specific library to a non-empty value
+#
+#   library_LIB         to create a static library
+#   library_DLL         to build a DLL
+#
+# either of the above SHOULD be SET
+#
+# 4. specify various OPTIONAL flags for a specific library with
+#
+#   library_CFLAGS      for gcc compiler flags
+#   library_CXXFLAGS    for g++ compiler flags
+#
+# the above is common for LIB and DLL
+#
+#   library_DLLNAME     for customized DLL name without an extension
+#   library_LDFLAGS     for linker flags
+#   library_LDLIBS      for dependent libraries
+#   library_RCSRC       for rc source
+#   library_RCFLAGS     for rc flags
+#   library_DEF         for .def file, if not set all the symbols are exported
+#   library_NO_EXPORT   if set, no symbols are exported in .def file
+#   library_EXTRADEPS   for extra dependencies
+#   library_NO_IMPLIB   if set, implib is not generated.
+#   library_DESC        for a BLDLEVEL description string
+#   library_OUTDIR      for the place where to store .DLL and so on
+#
+# the above is only for DLL
+
+BIN_LIBRARIES := os2compat
+
+os2compat_DIRS := io memory network process thread
+os2compat_SRCS := $(foreach d,$(os2compat_DIRS),$(wildcard $(d)/*.c))
+os2compat_LIB  := 1
+os2compat_DLL  := 1
+os2compat_DLLNAME := os2comp0
+os2compat_DESC := Supplementary library for missing features in OS/2 kLIBC
+os2compat_OUTDIR := lib
+
+include Makefile.common
+
+# additional stuffs
+
+PREFIX := /usr/local
+LIBDIR := $(PREFIX)/lib
+INCLUDEDIR := $(PREFIX)/include
+
+INSTALL := ginstall
+
+.PHONY: install install_libs install_headers
+
+install: all install_libs install_headers
+
+LIB_FILES := $(os2compat_OUTDIR)/$(os2compat_DLLNAME)$(DLL_EXT) \
+             $(os2compat_OUTDIR)/os2compat$(LIB_EXT) \
+             $(os2compat_OUTDIR)/os2compat$(OMF_LIB_EXT) \
+             $(os2compat_OUTDIR)/os2compat_dll$(LIB_EXT) \
+             $(os2compat_OUTDIR)/os2compat_dll$(OMF_LIB_EXT)
+
+install_libs: $(LIB_FILES)
+	$(INSTALL) -d $(DESTDIR)$(LIBDIR)
+	$(INSTALL) $(LIB_FILES) $(DESTDIR)$(LIBDIR)
+
+HEADER_FILES := include/os2compat/dirent.h \
+                include/os2compat/netdb.h \
+                include/os2compat/poll.h \
+                include/os2compat/semaphore.h \
+                include/os2compat/net/if.h \
+                include/os2compat/sys/mman.h \
+                include/os2compat/sys/socket.h \
+                include/os2compat/sys/xpoll.h
+
+PRIV_HEADER_FILES := io/scandir.h \
+                     memory/mmap.h \
+                     network/cmsg.h \
+                     network/getaddrinfo.h \
+                     network/if_nameindex.h \
+                     network/poll.h \
+                     network/shutdown.h \
+                     network/socklen_t.h \
+                     network/xpoll.h \
+                     thread/semaphore.h
+
+install_headers: $(HEADER_FILES) $(PRIV_HEADER_FILES )
+	for h in $(subst include/,,$(HEADER_FILES)); do \
+	  $(INSTALL) -D include/$$h $(DESTDIR)$(INCLUDEDIR)/$$h; \
+	done
+	for h in $(PRIV_HEADER_FILES); do \
+	  $(INSTALL) -D $$h $(DESTDIR)$(INCLUDEDIR)/os2compat/priv/$$h; \
+	done