$NetBSD: patch-SConstruct,v 1.11 2023/07/29 11:45:43 adam Exp $

Add support for NetBSD and Dragonfly.
Avoid -fatal-warnings: ld might complain about conflicting versions.
Fix locations.
Don't compile with debug info.
Don't mess with the linker.
Respect LDFLAGS and CXXFLAGS.

--- SConstruct.orig	2023-06-29 13:37:52.000000000 +0000
+++ SConstruct
@@ -1266,6 +1266,7 @@ envDict = dict(BUILD_ROOT=buildDir,
                CONFIGURELOG='$BUILD_ROOT/scons/config.log',
                CONFIG_HEADER_DEFINES={},
                LIBDEPS_TAG_EXPANSIONS=[],
+               ENV=os.environ,
                )
 
 # By default, we will get the normal SCons tool search. But if the
@@ -1455,7 +1456,9 @@ def CheckForProcessor(context, which_arc
 os_macros = {
     "windows": "defined(_WIN32)",
     "solaris": "defined(__sun)",
+    "dragonfly": "defined(__DragonFly__)",
     "freebsd": "defined(__FreeBSD__)",
+    "netbsd": "defined(__NetBSD__)",
     "openbsd": "defined(__OpenBSD__)",
     "iOS": "defined(__APPLE__) && TARGET_OS_IOS && !TARGET_OS_SIMULATOR",
     "iOS-sim": "defined(__APPLE__) && TARGET_OS_IOS && TARGET_OS_SIMULATOR",
@@ -1591,7 +1594,7 @@ if env.TargetOSIs('posix'):
         env.Append(
             CCFLAGS_WERROR=["-Werror"],
             CXXFLAGS_WERROR=['-Werror=unused-result'] if env.ToolchainIs('clang') else [],
-            LINKFLAGS_WERROR=['-Wl,-fatal_warnings' if env.TargetOSIs('darwin') else "-Wl,--fatal-warnings"],
+            LINKFLAGS_WERROR=[''],
         )
 elif env.TargetOSIs('windows'):
         env.Append(
@@ -2006,7 +2009,7 @@ if env['_LIBDEPS'] == '$_LIBDEPS_LIBS':
     if not env.TargetOSIs('solaris', 'darwin', 'windows', 'openbsd'):
         env.Tool('thin_archive')
 
-if env.TargetOSIs('linux', 'freebsd', 'openbsd'):
+if env.TargetOSIs('linux', 'freebsd', 'openbsd', 'netbsd', 'dragonfly'):
     env['LINK_WHOLE_ARCHIVE_LIB_START'] = '-Wl,--whole-archive'
     env['LINK_WHOLE_ARCHIVE_LIB_END'] = '-Wl,--no-whole-archive'
     env['LINK_AS_NEEDED_LIB_START'] = '-Wl,--as-needed'
@@ -2183,14 +2186,14 @@ if env.TargetOSIs('linux'):
 elif env.TargetOSIs('solaris'):
      env.Append( LIBS=["socket","resolv","lgrp"] )
 
-elif env.TargetOSIs('freebsd'):
+elif env.TargetOSIs('freebsd', 'dragonfly'):
     env.Append( LIBS=[ "kvm" ] )
     env.Append( CCFLAGS=[ "-fno-omit-frame-pointer" ] )
 
 elif env.TargetOSIs('darwin'):
     env.Append( LIBS=["resolv"] )
 
-elif env.TargetOSIs('openbsd'):
+elif env.TargetOSIs('netbsd', 'openbsd'):
     env.Append( LIBS=[ "kvm" ] )
 
 elif env.TargetOSIs('windows'):
@@ -2492,7 +2495,6 @@ if env.TargetOSIs('posix'):
 
     # -Winvalid-pch Warn if a precompiled header (see Precompiled Headers) is found in the search path but can't be used.
     env.Append( CCFLAGS=["-fasynchronous-unwind-tables",
-                         "-ggdb" if not env.TargetOSIs('emscripten') else "-g",
                          "-Wall",
                          "-Wsign-compare",
                          "-Wno-unknown-pragmas",
@@ -3019,7 +3021,7 @@ def doConfigure(myenv):
         myenv.AddMethod(
             functools.partial(var_func, var=var, func=CheckFlag), f"Check{var}Supported")
 
-    if myenv.ToolchainIs('gcc', 'clang'):
+    if myenv.ToolchainIs('gcc', 'clang') and get_option('runtime-hardening') == "on":
         # This tells clang/gcc to use the gold linker if it is available - we prefer the gold linker
         # because it is much faster. Don't use it if the user has already configured another linker
         # selection manually.
@@ -3415,9 +3417,6 @@ def doConfigure(myenv):
     if usingLibStdCxx:
         def CheckModernLibStdCxx(context):
             test_body = """
-            #if !__has_include(<experimental/filesystem>)
-            #error "libstdc++ from GCC 5.3.0 or newer is required"
-            #endif
             """
 
             context.Message('Checking for libstdc++ 5.3.0 or better... ')
@@ -3828,7 +3827,7 @@ def doConfigure(myenv):
         # Explicitly use the new gnu hash section if the linker offers
         # it, except on android since older runtimes seem to not
         # support it. For that platform, use 'both'.
-        if env.TargetOSIs('android'):
+        if env.TargetOSIs('android') or env.TargetOSIs('netbsd'):
             myenv.AddToLINKFLAGSIfSupported('-Wl,--hash-style=both')
         else:
             myenv.AddToLINKFLAGSIfSupported('-Wl,--hash-style=gnu')
@@ -4119,8 +4118,9 @@ def doConfigure(myenv):
     def checkOpenSSL(conf):
         sslLibName = "ssl"
         cryptoLibName = "crypto"
-        sslLinkDependencies = ["crypto", "dl"]
-        if conf.env.TargetOSIs('freebsd'):
+        if conf.env.TargetOSIs('linux', 'solaris'):
+            sslLinkDependencies = ["crypto", "dl"]
+        else:
             sslLinkDependencies = ["crypto"]
 
         if conf.env.TargetOSIs('windows'):
@@ -4457,7 +4457,7 @@ def doConfigure(myenv):
         myenv.ConfError("Couldn't find SASL header/libraries")
 
     # requires ports devel/libexecinfo to be installed
-    if env.TargetOSIs('freebsd', 'openbsd'):
+    if env.TargetOSIs('dragonfly', 'freebsd', 'netbsd', 'openbsd'):
         if not conf.CheckLib("execinfo"):
             myenv.ConfError("Cannot find libexecinfo, please install devel/libexecinfo.")