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[PATCH v2] Add a "selfcontained" mode to provide missing headers on windows

From: Ulf Hermann <ulf dot hermann at qt dot io>
To: <elfutils-devel at sourceware dot org>
Date: Thu, 4 May 2017 10:44:18 +0200
Subject: [PATCH v2] Add a "selfcontained" mode to provide missing headers on windows
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With MSVC there is no features.h, uid_t, gid_t, mode_t, and pid_t are
not defined and there is also no elf.h. To make it possible to build
other software against libelf and libdw, install our own version of
elf.h, and a bare-bones features.h that provides exactly the above
declarations. The features.h declarations are provided like mingw
defines them.

(v1 had features.h directly in the install rule, which is impractical
as we will need to add more things later)

Signed-off-by: Ulf Hermann <ulf.hermann@qt.io>
---
 ChangeLog          |  4 ++++
 configure.ac       |  6 ++++++
 lib/ChangeLog      |  6 ++++++
 lib/Makefile.am    | 17 ++++++++++++++++-
 lib/features.h.in  | 43 +++++++++++++++++++++++++++++++++++++++++++
 libelf/Makefile.am |  9 ++++++++-
 tests/ChangeLog    |  5 +++++
 tests/Makefile.am  |  6 ++++++
 8 files changed, 94 insertions(+), 2 deletions(-)
 create mode 100644 lib/features.h.in

diff --git a/ChangeLog b/ChangeLog
index d43eeb6..cf14aec 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2017-05-03  Ulf Hermann  <ulf.hermann@qt.io>
+
+	* configure.ac: Add an --enable-selfcontained switch.
+
 2017-04-28  Ulf Hermann  <ulf.hermann@qt.io>
 
 	* configure.ac: Determine the binary format we're building natively.
diff --git a/configure.ac b/configure.ac
index e4b2946..1e7778d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -124,6 +124,12 @@ AS_HELP_STRING([--enable-gnulib],
                use_gnulib=$enableval, use_gnulib=no)
 AM_CONDITIONAL(USE_GNULIB, test "$use_gnulib" = yes)
 
+AC_ARG_ENABLE([selfcontained],
+AS_HELP_STRING([--enable-selfcontained],
+	       [install extra headers to enable including and linking the libraries on non-GNU systems]),
+	       selfcontained=$enableval, selfcontained=no)
+AM_CONDITIONAL(SELFCONTAINED, test "$selfcontained" = yes)
+
 AC_PROG_CC
 
 gl_EARLY
diff --git a/lib/ChangeLog b/lib/ChangeLog
index ecc6179..2da6235 100644
--- a/lib/ChangeLog
+++ b/lib/ChangeLog
@@ -1,3 +1,9 @@
+2017-05-03  Ulf Hermann  <ulf.hermann@qt.io>
+
+	* features.h.in: New file.
+	* Makefile.am: In selfcontained mode, install features.h.in as
+	features.h.
+
 2017-04-27  Ulf Hermann  <ulf.hermann@qt.io>
 
 	* eu-config.h: Define attribute_hidden to be empty if the compiler
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 17d16d0..afff717 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -39,8 +39,23 @@ libeu_a_SOURCES = xstrdup.c xstrndup.c xmalloc.c next_prime.c \
 
 noinst_HEADERS = fixedsizehash.h libeu.h system.h dynamicsizehash.h list.h \
 		 md5.h sha1.h eu-config.h color.h printversion.h
-EXTRA_DIST = dynamicsizehash.c
+EXTRA_DIST = dynamicsizehash.c features.h.in
 
 if !GPROF
 xmalloc_CFLAGS = -ffunction-sections
 endif
+
+if SELFCONTAINED
+install-headers: install-am features.h.in
+	$(mkinstalldirs) $(DESTDIR)$(includedir)
+	$(INSTALL_HEADER) $(top_srcdir)/lib/features.h.in $(DESTDIR)$(includedir)/features.h
+
+uninstall-headers: uninstall-am
+	rm -f $(DESTDIR)$(includedir)/features.h
+else
+install-headers:
+uninstall-headers:
+endif
+
+install: install-am install-headers
+uninstall: uninstall-am uninstall-headers
diff --git a/lib/features.h.in b/lib/features.h.in
new file mode 100644
index 0000000..6eb3c67
--- /dev/null
+++ b/lib/features.h.in
@@ -0,0 +1,43 @@
+/* This file defines uid_t, gid_t, mode_t, pid_t
+   Copyright (C) 2017 The Qt Company Ltd
+   This file is part of elfutils.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef _FEATURES_H
+#define _FEATURES_H 1
+
+#include <stdint.h>
+
+typedef uint32_t uid_t;
+typedef uint32_t gid_t;
+typedef uint32_t mode_t;
+#ifdef _WIN64
+typedef int64_t  pid_t;
+#else
+typedef int32_t  pid_t;
+#endif
+
+#endif /* features.h */
diff --git a/libelf/Makefile.am b/libelf/Makefile.am
index 3286dda..1a2b85a 100644
--- a/libelf/Makefile.am
+++ b/libelf/Makefile.am
@@ -141,9 +141,16 @@ uninstall: uninstall-am uninstall-lib
 	rm -f $(DESTDIR)$(libdir)/$(libelf_SONAME)
 	rm -f $(DESTDIR)$(libdir)/$(libelf_BARE)
 
-noinst_HEADERS = elf.h abstract.h common.h exttypes.h gelf_xlate.h libelfP.h \
+noinst_HEADERS = abstract.h common.h exttypes.h gelf_xlate.h libelfP.h \
 		 version_xlate.h gnuhash_xlate.h note_xlate.h dl-hash.h \
 		 chdr_xlate.h
+
+if SELFCONTAINED
+include_HEADERS += elf.h
+else
+noinst_HEADERS += elf.h
+endif
+
 EXTRA_DIST = libelf.map
 
 CLEANFILES += $(am_libelf_pic_a_OBJECTS) $(libelf_SONAME) $(libelf_BARE)
diff --git a/tests/ChangeLog b/tests/ChangeLog
index ab1a3788..b5a1866 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,8 @@
+2017-05-03  Ulf Hermann  <ulf.hermann@qt.io>
+
+	* Makefile.am: In selfcontained mode, run the system libelf test
+	against our bundled elf.h.
+
 2017-04-28  Ulf Hermann  <ulf.hermann@qt.io>
 
 	* run-disasm-x86-64.sh: Disable if the native binary format is not
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 114ab7a..ed050eb 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -511,9 +511,15 @@ emptyfile_LDADD = $(libelf) $(libgnu)
 vendorelf_LDADD = $(libelf) $(libgnu)
 fillfile_LDADD = $(libelf) $(libgnu)
 
+if SELFCONTAINED
+# In self contained mode we cannot expect a system elf header.
+# Use our own then
+system_elf_libelf_test_CPPFLAGS = -I$(top_srcdir)/libelf
+else
 # We want to test the libelf header against the system elf.h header.
 # Don't include any -I CPPFLAGS.
 system_elf_libelf_test_CPPFLAGS =
+endif
 if USE_GNULIB
 system_elf_libelf_test_CPPFLAGS += -I$(top_srcdir)/libgnu -I$(top_builddir)/libgnu
 endif
-- 
2.1.4

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