d: Fix undefined reference to pragma(inline) symbol (PR106563)

Functions that are declared `pragma(inline)' should be treated as if
they are defined in every translation unit they are referenced from,
regardless of visibility protection.  Ensure they always get
DECL_ONE_ONLY linkage, and start emitting them into other modules that
import them.

	PR d/106563

gcc/d/ChangeLog:

	* decl.cc (DeclVisitor::visit (FuncDeclaration *)): Set semanticRun
	before generating its symbol.
	(function_defined_in_root_p): New function.
	(function_needs_inline_definition_p): New function.
	(maybe_build_decl_tree): New function.
	(get_symbol_decl): Call maybe_build_decl_tree before returning symbol.
	(start_function): Use function_defined_in_root_p instead of inline
	test for locally defined symbols.
	(set_linkage_for_decl): Check for inline functions before private or
	protected symbols.

gcc/testsuite/ChangeLog:

	* gdc.dg/torture/torture.exp (srcdir): New proc.
	* gdc.dg/torture/imports/pr106563math.d: New test.
	* gdc.dg/torture/imports/pr106563regex.d: New test.
	* gdc.dg/torture/imports/pr106563uni.d: New test.
	* gdc.dg/torture/pr106563.d: New test.

5 files changed, 59 insertions, 0 deletions

diff --git a/gcc/testsuite/gdc.dg/torture/imports/pr106563math.d b/gcc/testsuite/gdc.dg/torture/imports/pr106563math.d
new file mode 100644
index 0000000..b9351ea
--- /dev/null
+++ b/gcc/testsuite/gdc.dg/torture/imports/pr106563math.d
@@ -0,0 +1,12 @@
+module imports.pr106563math;
+
+T nextPow2(T)(const T val)
+{
+    return powIntegralImpl(val);
+}
+
+pragma(inline, true)
+T powIntegralImpl(T)(T)
+{
+    return 1;
+}
diff --git a/gcc/testsuite/gdc.dg/torture/imports/pr106563regex.d b/gcc/testsuite/gdc.dg/torture/imports/pr106563regex.d
new file mode 100644
index 0000000..a2cd90c
--- /dev/null
+++ b/gcc/testsuite/gdc.dg/torture/imports/pr106563regex.d
@@ -0,0 +1,7 @@
+module imports.pr106563regex;
+import imports.pr106563uni;
+
+struct CharMatcher
+{
+    typeof(MultiArray!().length) trie;
+}
diff --git a/gcc/testsuite/gdc.dg/torture/imports/pr106563uni.d b/gcc/testsuite/gdc.dg/torture/imports/pr106563uni.d
new file mode 100644
index 0000000..16e3bc8
--- /dev/null
+++ b/gcc/testsuite/gdc.dg/torture/imports/pr106563uni.d
@@ -0,0 +1,15 @@
+module imports.pr106563uni;
+
+struct MultiArray()
+{
+    @property length()
+    {
+        return spaceFor!0();
+    }
+}
+
+size_t spaceFor(size_t bits)()
+{
+    import imports.pr106563math;
+    return nextPow2(bits);
+}
diff --git a/gcc/testsuite/gdc.dg/torture/pr106563.d b/gcc/testsuite/gdc.dg/torture/pr106563.d
new file mode 100644
index 0000000..7e15442
--- /dev/null
+++ b/gcc/testsuite/gdc.dg/torture/pr106563.d
@@ -0,0 +1,16 @@
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106563
+// { dg-do link }
+// { dg-additional-files "imports/pr106563math.d imports/pr106563regex.d imports/pr106563uni.d" }
+// { dg-additional-options "-I[srcdir] -fno-druntime" }
+import imports.pr106563math;
+import imports.pr106563regex;
+
+auto requireSize()(size_t size)
+{
+    return nextPow2(size);
+}
+
+extern(C) int main()
+{
+    return cast(int)requireSize(0);
+}
diff --git a/gcc/testsuite/gdc.dg/torture/torture.exp b/gcc/testsuite/gdc.dg/torture/torture.exp
index f7d00b1..d9c6a79 100644
--- a/gcc/testsuite/gdc.dg/torture/torture.exp
+++ b/gcc/testsuite/gdc.dg/torture/torture.exp
@@ -19,6 +19,15 @@
 # Load support procs.
 load_lib gdc-dg.exp
 
+# Helper function allows adding tests that use imports/*, but don't compile
+# the sources in with dg-additional-sources.
+global testdir
+set testdir $srcdir/$subdir
+proc srcdir {} {
+    global testdir
+    return $testdir
+}
+
 # The default option list can be overridden by
 # TORTURE_OPTIONS="{ { list1 } ... { listN } }"