diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9e546f261cc31b821750456f2b0bc421cfa9cc67..1b1e5b0ba6dba0af8b874808b1acfe746e5f1ed5 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2024-03-17  John David Anglin  <danglin@gcc.gnu.org>
+
+	* config/pa/pa.cc (pa_delegitimize_address): Delegitimize UNSPEC_TP.
+
 2024-03-16  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/114175
diff --git a/gcc/DATESTAMP b/gcc/DATESTAMP
index 7495d4c6422977d2648ffab0fb017057c09b90c7..83552dd360e49af851a4a71063b281b1636ea6c0 100644
--- a/gcc/DATESTAMP
+++ b/gcc/DATESTAMP
@@ -1 +1 @@
-20240317
+20240318
diff --git a/gcc/d/ChangeLog b/gcc/d/ChangeLog
index 843a3b7fb57aca28fd7c59a40241172dd96a71a7..81f053b57649a589f514c7629172c918a764dd20 100644
--- a/gcc/d/ChangeLog
+++ b/gcc/d/ChangeLog
@@ -1,3 +1,8 @@
+2024-03-17  Iain Buclaw  <ibuclaw@gdcproject.org>
+
+	* dmd/MERGE: Merge upstream dmd 855353a1d9.
+	* dmd/VERSION:
+
 2024-03-10  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	PR d/112285
diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index 7781daf40d2d17ad4e30da1f5dfde8608e868344..9ffad8299f2d98db73c3fd6bbc8c5c190a35e4fd 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,3 +1,9 @@
+2024-03-17  Harald Anlauf  <anlauf@gmx.de>
+
+	PR fortran/101135
+	* trans-array.cc (gfc_get_dataptr_offset): Check for optional
+	arguments being present before dereferencing data pointer.
+
 2024-03-15  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/87477
diff --git a/gcc/m2/ChangeLog b/gcc/m2/ChangeLog
index b051f0178994a56ca35f160f2fb9cdc9550e90e9..bd5a564250b2dfd30960cba578d67b956c442a73 100644
--- a/gcc/m2/ChangeLog
+++ b/gcc/m2/ChangeLog
@@ -1,3 +1,44 @@
+2024-03-17  Gaius Mulley  <gaiusmod2@gmail.com>
+
+	PR modula2/114296
+	* gm2-compiler/M2ALU.mod (ElementsSolved): Add tokenno parameter.
+	Add constant checks and generate error messages.
+	(EvalSetValues): Pass tokenno parameter to ElementsSolved.
+	* gm2-compiler/M2LexBuf.mod (stop): New procedure.
+	(MakeVirtualTok): Call stop if caret = BadTokenNo.
+	* gm2-compiler/M2Quads.def (BuildNulExpression): Add tokpos
+	parameter.
+	(BuildSetStart): Ditto.
+	(BuildEmptySet): Ditto.
+	(BuildConstructorEnd): Add startpos parameter.
+	(BuildTypeForConstructor): Add tokpos parameter.
+	* gm2-compiler/M2Quads.mod (BuildNulExpression): Add tokpos
+	parameter and push tokpos to the quad stack.
+	(BuildSetStart): Add tokpos parameter and push tokpos.
+	(BuildSetEnd): Rewrite.
+	(BuildEmptySet): Add tokpos parameter and push tokpos with
+	the set	type.
+	(BuildConstructorStart): Pop typepos.
+	(BuildConstructorEnd): Add startpos parameter.
+	Create valtok from startpos and cbratokpos.
+	(BuildTypeForConstructor): Add tokpos parameter.
+	* gm2-compiler/M2Range.def (InitAssignmentRangeCheck): Rename
+	d to des and e to expr.
+	Add destok and exprtok parameters.
+	* gm2-compiler/M2Range.mod (InitAssignmentRangeCheck): Rename
+	d to des and e to expr.
+	Add destok and exprtok parameters.
+	Save destok and exprtok into range record.
+	(FoldAssignment): Pass exprtok to TryDeclareConstant.
+	* gm2-compiler/P3Build.bnf (ComponentValue): Rewrite.
+	(Constructor): Rewrite.
+	(ConstSetOrQualidentOrFunction): Rewrite.
+	(SetOrQualidentOrFunction): Rewrite.
+	* gm2-compiler/PCBuild.bnf (ConstSetOrQualidentOrFunction): Rewrite.
+	(SetOrQualidentOrFunction): Rewrite.
+	* gm2-compiler/PHBuild.bnf (Constructor): Rewrite.
+	(ConstSetOrQualidentOrFunction): Rewrite.
+
 2024-03-14  Gaius Mulley  <gaiusmod2@gmail.com>
 
 	PR modula2/114294
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 3092127fbf37e8e908e40c34f79d2c24e5109aef..d36e4803079c3bd470e802de21e7c1d66bd506b9 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,14 @@
+2024-03-17  Harald Anlauf  <anlauf@gmx.de>
+
+	PR fortran/101135
+	* gfortran.dg/missing_optional_dummy_6a.f90: Adjust diagnostic pattern.
+	* gfortran.dg/ubsan/missing_optional_dummy_8.f90: New test.
+
+2024-03-17  Gaius Mulley  <gaiusmod2@gmail.com>
+
+	PR modula2/114296
+	* gm2/pim/fail/badtype2.mod: New test.
+
 2024-03-16  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/114175
diff --git a/libphobos/ChangeLog b/libphobos/ChangeLog
index 7d3afd3d3ffd5751411d0d0d3ec29595c186c573..f728beeb11fcfa4e624ccebe344d22c1ddfdfef7 100644
--- a/libphobos/ChangeLog
+++ b/libphobos/ChangeLog
@@ -1,3 +1,7 @@
+2024-03-17  Iain Buclaw  <ibuclaw@gdcproject.org>
+
+	* libdruntime/MERGE: Merge upstream druntime 855353a1d9.
+
 2024-03-03  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	* libdruntime/MERGE: Merge upstream druntime 02d6d07a69.
diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index ac5e6e921fdf6cb379fe6365b08f7c776f2d47a1..c4e5f57e1a31684f53a372fc5448f4aeb8255bb8 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,12 @@
+2024-03-17  François Dumont  <fdumont@gcc.gnu.org>
+
+	PR libstdc++/114316
+	* include/debug/safe_iterator.tcc (_Safe_iterator<>::_M_valid_range):
+	First check if both iterators are value-initialized before checking if
+	singular.
+	* testsuite/23_containers/set/debug/114316.cc: New test case.
+	* testsuite/23_containers/vector/debug/114316.cc: New test case.
+
 2024-03-14  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/114325