Disable gdc execution tests without libphobos

	gcc/testsuite:
	* lib/target-supports.exp (check_compile): Handle D.
	(check_effective_target_d_runtime): New proc.
	* lib/gdc-dg.exp (gdc-dg-test): Demote link and run tests to
	compile unless d_runtime.
	* gdc.dg/runnable.d: Skip unless d_runtime.
	* gdc.dg/lto/lto.exp: Require d_runtime to run tests.

	gcc:
	* doc/sourcebuild.texi (Effective-Target Keywords, Environment
	attributes): Document d_runtime.

From-SVN: r266438

gcc/ChangeLog

+2018-11-25  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* doc/sourcebuild.texi (Effective-Target Keywords, Environment
+	attributes): Document d_runtime.
+
 2018-11-25  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR bootstrap/88157

gcc/doc/sourcebuild.texi

@@ -2106,6 +2106,9 @@ Target provides a full C99 runtime.
 Target @code{string.h} and @code{wchar.h} headers provide C++ required
 overloads for @code{strchr} etc. functions.
 
+@item d_runtime
+Target provides the D runtime.
+
 @item dummy_wcsftime
 Target uses a dummy @code{wcsftime} function that always returns zero.
 

gcc/testsuite/ChangeLog

+2018-11-25  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* lib/target-supports.exp (check_compile): Handle D.
+	(check_effective_target_d_runtime): New proc.
+	* lib/gdc-dg.exp (gdc-dg-test): Demote link and run tests to
+	compile unless d_runtime.
+	* gdc.dg/runnable.d: Skip unless d_runtime.
+	* gdc.dg/lto/lto.exp: Require d_runtime to run tests.
+
 2018-11-24  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/88143

gcc/testsuite/gdc.dg/lto/lto.exp

@@ -36,6 +36,11 @@ if { ![check_effective_target_lto] } {
     return
 }
 
+# Likewise if the D runtime library is missing.
+if { ![check_effective_target_d_runtime] } {
+    return
+}
+
 lto_init no-mathlib
 
 # Define an identifier for use with this suite to avoid name conflicts

gcc/testsuite/gdc.dg/runnable.d

 // { dg-additional-sources "imports/runnable.d" }
 // { dg-do run { target hw } }
+// { dg-skip-if "needs gcc/config.d" { ! d_runtime } }
 
 module runnable;
 

gcc/testsuite/lib/gdc-dg.exp

@@ -19,6 +19,19 @@ load_lib gcc-dg.exp
 # Define gdc callbacks for dg.exp.
 
 proc gdc-dg-test { prog do_what extra_tool_flags } {
+    upvar dg-do-what dg-do-what
+
+    # Demote link and run tests to compile-only if D runtime is missing.
+    if ![check_effective_target_d_runtime] {
+	switch $do_what {
+	    link -
+	    run {
+		set do_what compile
+		set dg-do-what compile
+	    }
+	}
+    }
+
     set result \
         [gcc-dg-test-1 gdc_target_compile $prog $do_what $extra_tool_flags]
 

gcc/testsuite/lib/target-supports.exp

@@ -31,6 +31,7 @@
 # Assume by default that CONTENTS is C code.  
 # Otherwise, code should contain:
 # "// C++" for c++,
+# "// D" for D,
 # "! Fortran" for Fortran code,
 # "/* ObjC", for ObjC
 # "// ObjC++" for ObjC++
@@ -58,6 +59,7 @@ proc check_compile {basename type contents args} {
     switch -glob -- $contents {
 	"*! Fortran*" { set src ${basename}[pid].f90 }
 	"*// C++*" { set src ${basename}[pid].cc }
+	"*// D*" { set src ${basename}[pid].d }
 	"*// ObjC++*" { set src ${basename}[pid].mm }
 	"*/* ObjC*" { set src ${basename}[pid].m }
 	"*// Go*" { set src ${basename}[pid].go }
@@ -7154,6 +7156,19 @@ proc check_effective_target_c99_runtime { } {
     }]
 }
 
+# Return 1 if the target provides the D runtime.
+
+proc check_effective_target_d_runtime { } {
+    return [check_no_compiler_messages d_runtime executable {
+	// D
+	module mod;
+
+	extern(C) int main() {
+	    return 0;
+	}
+    }]
+}
+
 # Return 1 if  target wchar_t is at least 4 bytes.
 
 proc check_effective_target_4byte_wchar_t { } {