Set executable stack flag when linking

This is required on some modern hardneded Linux systems to allow
to dlopen executable objects (load plugins).

https://discourse.ardour.org/t/tls-1295-lea-so-linux-vers-doesnt-work/111778/20?u=x42

gtk2_ardour/wscript

@@ -678,6 +678,7 @@ def build(bld):
         obj.source += [ 'bundle_env_mingw.cc' ]
         obj.source += [ 'windows_icon.rc' ]
     else:
+        obj.linkflags += ' -zexecstack'
         obj.source += [ 'bundle_env_linux.cc' ]
         obj.use += [ 'X11' ]
 

headless/wscript

@@ -21,6 +21,7 @@ def build(bld):
     obj.source    = hardour_sources
     obj.target = 'hardour-' + bld.env['VERSION']
     obj.includes = ['.']
+    obj.linkflags= ''
     obj.use      = [ 'libpbd',
                      'libardour',
                      'libardour_cp',
@@ -51,11 +52,13 @@ def build(bld):
     if sys.platform == 'darwin':
         obj.uselib += ' AUDIOUNITS OSX'
         obj.use    += ' libappleutility'
+    elif bld.env['build_target'] == 'mingw':
+        if bld.env['DEBUG'] == False:
+            obj.linkflags += ' -mwindows'
+    else:
+        obj.linkflags += ' -zexecstack'
+
     obj.includes += ['../libs']
 
-    if bld.env['build_target'] == 'mingw':
-        if bld.env['DEBUG'] == False:
-            obj.linkflags = ['-mwindows']
-
     if bld.is_defined('NEED_INTL'):
-        obj.linkflags = ' -lintl'
+        obj.linkflags += ' -lintl'

libs/fst/wscript

@@ -19,6 +19,7 @@ def build(bld):
         obj.source    = 'vst3-scanner.cc'
         obj.target    = 'ardour-vst3-scanner'
         obj.includes  = [ '../pbd/', '../ardour/', '../vst3/', '..' ]
+        obj.linkflags = ''
         obj.defines   = [
             'VST3_SCANNER_APP',
             'VERSIONSTRING="' + bld.env['VERSION'] + '"',
@@ -31,11 +32,14 @@ def build(bld):
 
         if bld.is_defined('HAVE_USB'):
             obj.uselib += ' USB'
+
         if sys.platform == 'darwin':
             obj.uselib += ' OSX'
         if bld.env['build_target'] == 'mingw':
             obj.uselib += ' GDI32'
-            obj.linkflags = ['-mwindows']
+            obj.linkflags += ' -mwindows'
+        else:
+            obj.linkflags += ' -zexecstack'
 
         if re.search ("bsd", sys.platform) != None:
             obj.defines.append('_POSIX_C_SOURCE=200809L')
@@ -47,10 +51,10 @@ def build(bld):
         obj = bld (features = 'cxx c cxxprogram')
         obj.source = ( 'vst2-scanner.cc' )
         obj.target = 'ardour-vst-scanner'
+        obj.linkflags= ''
         if bld.is_defined('WINDOWS_VST_SUPPORT'):
             bld (features = 'c', name='vstwin', source='vstwin.c', uselib = 'GIOMM', includes  = [ '../pbd/', '../ardour/', '.' ])
             obj.uselib = ['GIOMM', 'DL', 'GDI32', 'ARCHIVE', 'CURL', 'XML']
-            obj.linkflags = ['-mwindows']
             obj.use = [ 'libpbd', 'libtemporal', 'libevoral', 'vstwin' ]
         else:
             obj.uselib = ['GIOMM', 'DL', 'OSX', 'ARCHIVE', 'CURL', 'XML' ]
@@ -59,6 +63,13 @@ def build(bld):
         if bld.is_defined('HAVE_USB'):
             obj.uselib += ['USB']
 
+        if sys.platform == 'darwin':
+            pass
+        elif bld.env['build_target'] == 'mingw':
+            obj.linkflags += ' -mwindows'
+        else:
+            obj.linkflags += ' -zexecstack'
+
         obj.includes  = [ '../pbd/', '../ardour/', '.' ]
         obj.defines = [
             '_POSIX_SOURCE',

libs/vfork/wscript

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 import os
+import sys
 
 def options(opt):
     pass
@@ -10,6 +11,7 @@ def configure(conf):
 def build(bld):
     if bld.env['build_target'] == 'mingw':
         return
+
     obj = bld (features = 'c cprogram')
     obj.source = 'exec_wrapper.c'
     obj.target = 'ardour-exec-wrapper'
@@ -18,3 +20,8 @@ def build(bld):
             '_POSIX_SOURCE',
             '_XOPEN_SOURCE=500',
     ]
+
+    if sys.platform == 'darwin':
+        pass
+    else:
+        obj.linkflags = ' -zexecstack'

luasession/wscript

@@ -34,6 +34,7 @@ def build(bld):
     obj.source       = 'luasession.cc'
     obj.target       = 'luasession'
     obj.includes     = ['../libs']
+    obj.linkflags    = ''
     obj.use          = ['liblua',
                         'libpbd',
                         'libardour',
@@ -66,12 +67,13 @@ def build(bld):
     if sys.platform == 'darwin':
         obj.uselib += ' AUDIOUNITS OSX'
         obj.use    += ' libappleutility'
-
-    if bld.env['build_target'] == 'mingw':
-        obj.linkflags = ['-mwindows']
+    elif bld.env['build_target'] == 'mingw':
+        obj.linkflags += ' -mwindows'
+    else:
+        obj.linkflags += ' -zexecstack'
 
     if bld.is_defined('NEED_INTL'):
-        obj.linkflags = ' -lintl'
+        obj.linkflags += ' -lintl'
 
     if bld.env['build_target'] == 'mingw':
         obj.install_path = bld.env['BINDIR']

session_utils/wscript

@@ -25,6 +25,7 @@ def build_ardour_util(bld, util):
     obj.source   = ['common.cc', util + '.cc' ]
     obj.target   = pgmprefix + '-' + util
     obj.includes = ['.']
+    obj.linkflags= ''
     obj.use      = [ 'libpbd',
                      'libardour',
                      'libardour_cp',
@@ -56,13 +57,18 @@ def build_ardour_util(bld, util):
     if sys.platform == 'darwin':
         obj.uselib += ' AUDIOUNITS OSX'
         obj.use    += ' libappleutility'
+    elif bld.env['build_target'] == 'mingw':
+        obj.linkflags += ' -mwindows'
+    else:
+        obj.linkflags += ' -zexecstack'
+
     obj.includes += ['../libs']
 
     if bld.env['build_target'] == 'mingw':
         obj.install_path = bld.env['BINDIR']
 
     if bld.is_defined('NEED_INTL'):
-        obj.linkflags = ' -lintl'
+        obj.linkflags += ' -lintl'
 
 def build(bld):
     # session-utils depend on the dummy backend