From 4bb261b015d382a567563571ae4d399a16caebe2 Mon Sep 17 00:00:00 2001
From: "C. McEnroe" <june@causal.agency>
Date: Mon, 27 Jul 2020 21:55:29 -0400
Subject: Import LibreSSL 3.2.0

---
 m4/check-os-options.m4 | 142 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 m4/check-os-options.m4

(limited to 'm4/check-os-options.m4')

diff --git a/m4/check-os-options.m4 b/m4/check-os-options.m4
new file mode 100644
index 0000000..8241aee
--- /dev/null
+++ b/m4/check-os-options.m4
@@ -0,0 +1,142 @@
+AC_DEFUN([CHECK_OS_OPTIONS], [
+
+CFLAGS="$CFLAGS -Wall -std=gnu99 -fno-strict-aliasing"
+BUILD_NC=yes
+
+case $host_os in
+	*aix*)
+		HOST_OS=aix
+		if test "`echo $CC | cut -d ' ' -f 1`" != "gcc" ; then
+			CFLAGS="-qnoansialias $USER_CFLAGS"
+		fi
+		AC_SUBST([PLATFORM_LDADD], ['-lperfstat'])
+		;;
+	*cygwin*)
+		HOST_OS=cygwin
+		CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
+		;;
+	*darwin*)
+		HOST_OS=darwin
+		HOST_ABI=macosx
+		#
+		# Don't use arc4random on systems before 10.12 because of
+		# weak seed on failure to open /dev/random, based on latest
+		# public source:
+		# http://www.opensource.apple.com/source/Libc/Libc-997.90.3/gen/FreeBSD/arc4random.c
+		#
+		# We use the presence of getentropy() to detect 10.12. The
+		# following check take into account that:
+ 		#
+		#   - iOS <= 10.1 fails because of missing getentropy and
+		#     hence they miss sys/random.h
+		#
+		#   - in macOS 10.12 getentropy is not tagged as introduced in
+		#     10.12 so we cannot use it for target < 10.12
+		#
+		AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#include <AvailabilityMacros.h>
+#include <unistd.h>
+#include <sys/random.h>  /* Systems without getentropy() should die here */
+
+/* Based on: https://gitweb.torproject.org/tor.git/commit/?id=16fcbd21 */
+#ifndef MAC_OS_X_VERSION_10_12
+#  define MAC_OS_X_VERSION_10_12 101200
+#endif
+#if defined(MAC_OS_X_VERSION_MIN_REQUIRED)
+#  if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12
+#    error "Running on Mac OSX 10.11 or earlier"
+#  endif
+#endif
+                       ]], [[
+char buf[1]; getentropy(buf, 1);
+					   ]])],
+                       [ USE_BUILTIN_ARC4RANDOM=no ],
+                       [ USE_BUILTIN_ARC4RANDOM=yes ]
+		)
+		AC_MSG_CHECKING([whether to use builtin arc4random])
+		AC_MSG_RESULT([$USE_BUILTIN_ARC4RANDOM])
+		# Not available on iOS
+		AC_CHECK_HEADER([arpa/telnet.h], [], [BUILD_NC=no])
+		;;
+	*freebsd*)
+		HOST_OS=freebsd
+		HOST_ABI=elf
+		# fork detection missing, weak seed on failure
+		# https://svnweb.freebsd.org/base/head/lib/libc/gen/arc4random.c?revision=268642&view=markup
+		USE_BUILTIN_ARC4RANDOM=yes
+		AC_SUBST([PROG_LDADD], ['-lthr'])
+		;;
+	*hpux*)
+		HOST_OS=hpux;
+		if test "`echo $CC | cut -d ' ' -f 1`" = "gcc" ; then
+			CFLAGS="$CFLAGS -mlp64"
+		else
+			CFLAGS="-g -O2 +DD64 +Otype_safety=off $USER_CFLAGS"
+		fi
+		CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE=600 -D__STRICT_ALIGNMENT"
+		;;
+	*linux*)
+		HOST_OS=linux
+		HOST_ABI=elf
+		CPPFLAGS="$CPPFLAGS -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_SOURCE -D_GNU_SOURCE"
+		;;
+	*midipix*)
+		HOST_OS=midipix
+		CPPFLAGS="$CPPFLAGS -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_SOURCE -D_GNU_SOURCE"
+		;;
+	*netbsd*)
+		HOST_OS=netbsd
+		HOST_ABI=elf
+		AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#include <sys/param.h>
+#if __NetBSD_Version__ < 700000001
+        undefined
+#endif
+                       ]], [[]])],
+                       [ USE_BUILTIN_ARC4RANDOM=no ],
+                       [ USE_BUILTIN_ARC4RANDOM=yes ]
+		)
+		CPPFLAGS="$CPPFLAGS -D_OPENBSD_SOURCE"
+		;;
+	*openbsd* | *bitrig*)
+		HOST_OS=openbsd
+		HOST_ABI=elf
+		AC_DEFINE([HAVE_ATTRIBUTE__BOUNDED__], [1], [OpenBSD gcc has bounded])
+		AC_DEFINE([HAVE_ATTRIBUTE__DEAD], [1], [OpenBSD gcc has __dead])
+		;;
+	*mingw*)
+		HOST_OS=win
+		HOST_ABI=mingw64
+		BUILD_NC=no
+		CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE -D_POSIX -D_POSIX_SOURCE -D__USE_MINGW_ANSI_STDIO"
+		CPPFLAGS="$CPPFLAGS -D_REENTRANT -D_POSIX_THREAD_SAFE_FUNCTIONS"
+		CPPFLAGS="$CPPFLAGS -DWIN32_LEAN_AND_MEAN -D_WIN32_WINNT=0x0600"
+		CPPFLAGS="$CPPFLAGS"
+		AC_SUBST([PLATFORM_LDADD], ['-lws2_32'])
+		;;
+	*solaris*)
+		HOST_OS=solaris
+		HOST_ABI=elf
+		CPPFLAGS="$CPPFLAGS -D__EXTENSIONS__ -D_XOPEN_SOURCE=600 -DBSD_COMP"
+		AC_SUBST([PLATFORM_LDADD], ['-ldl -lnsl -lsocket'])
+		;;
+	*) ;;
+esac
+
+AC_ARG_ENABLE([nc],
+	AS_HELP_STRING([--enable-nc], [Enable installing TLS-enabled nc(1)]))
+AM_CONDITIONAL([ENABLE_NC], [test "x$enable_nc" = xyes])
+AM_CONDITIONAL([BUILD_NC],  [test x$BUILD_NC = xyes -o "x$enable_nc" = xyes])
+
+AM_CONDITIONAL([HOST_AIX],     [test x$HOST_OS = xaix])
+AM_CONDITIONAL([HOST_CYGWIN],  [test x$HOST_OS = xcygwin])
+AM_CONDITIONAL([HOST_DARWIN],  [test x$HOST_OS = xdarwin])
+AM_CONDITIONAL([HOST_FREEBSD], [test x$HOST_OS = xfreebsd])
+AM_CONDITIONAL([HOST_HPUX],    [test x$HOST_OS = xhpux])
+AM_CONDITIONAL([HOST_LINUX],   [test x$HOST_OS = xlinux])
+AM_CONDITIONAL([HOST_MIDIPIX], [test x$HOST_OS = xmidipix])
+AM_CONDITIONAL([HOST_NETBSD],  [test x$HOST_OS = xnetbsd])
+AM_CONDITIONAL([HOST_OPENBSD], [test x$HOST_OS = xopenbsd])
+AM_CONDITIONAL([HOST_SOLARIS], [test x$HOST_OS = xsolaris])
+AM_CONDITIONAL([HOST_WIN],     [test x$HOST_OS = xwin])
+])
-- 
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