llvm · eugeneepshteyn · Jul 17, 2025 · Jul 15, 2025 · Jul 15, 2025 · Jul 15, 2025
diff --git a/flang/docs/Extensions.md b/flang/docs/Extensions.md
@@ -1,9 +1,9 @@
-<!--===- docs/Extensions.md 
-  
+<!--===- docs/Extensions.md
+
    Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
    See https://llvm.org/LICENSE.txt for license information.
    SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-  
+
 -->
 
 # Fortran Extensions supported by Flang
@@ -170,6 +170,18 @@ end
   In the case of `DEFERRED` bindings in an `ABSTRACT` derived type,
   however, overrides are necessary, so they are permitted for inaccessible
   bindings with an optional warning.
+* Main program name is allowed to be the same as the other symbols used
+  in the main program, for example:
+```
+module m
+end
+program m
+use m
+end
+```
+  Note that internally the main program symbol name is all uppercase, unlike
+  the names of all other symbols, which are usually all lowercase. This
+  may make a difference in testing/debugging.
 
 ## Extensions, deletions, and legacy features supported by default
 

diff --git a/flang/lib/Semantics/check-omp-structure.cpp b/flang/lib/Semantics/check-omp-structure.cpp
@@ -1156,8 +1156,7 @@ void OmpStructureChecker::CheckThreadprivateOrDeclareTargetVar(
                         (sym->has<MainProgramDetails>() ||
                             sym->has<ModuleDetails>())) {
                       context_.Say(name->source,
-                          "The module name or main program name cannot be in a "
-                          "%s "
+                          "The module name cannot be in a %s "
                           "directive"_err_en_US,
                           ContextDirectiveAsFortran());
                     } else if (!IsSaved(*name->symbol) &&

diff --git a/flang/lib/Semantics/resolve-labels.cpp b/flang/lib/Semantics/resolve-labels.cpp
@@ -489,15 +489,30 @@ class ParseTreeAnalyzer {
 
   // C1401
   void Post(const parser::MainProgram &mainProgram) {
+    // Uppercase the name of the main program, so that its symbol name
+    // would be unique from similarly named non-main-program symbols.
+    auto upperCaseCharBlock = [](const parser::CharBlock &cb) {
+      char *ch{const_cast<char *>(cb.begin())};
+      char *endCh{ch + cb.size()};
+      while (ch != endCh) {
+        *ch++ = parser::ToUpperCaseLetter(*ch);
+      }
+    };
+    const parser::CharBlock *progName{nullptr};
+    if (const auto &program{
+            std::get<std::optional<parser::Statement<parser::ProgramStmt>>>(
+                mainProgram.t)}) {
+      progName = &program->statement.v.source;
+      upperCaseCharBlock(*progName);
+    }
     if (const parser::CharBlock *
         endName{GetStmtName(std::get<parser::Statement<parser::EndProgramStmt>>(
             mainProgram.t))}) {
-      if (const auto &program{
-              std::get<std::optional<parser::Statement<parser::ProgramStmt>>>(
-                  mainProgram.t)}) {
-        if (*endName != program->statement.v.source) {
+      upperCaseCharBlock(*endName);
+      if (progName) {
+        if (*endName != *progName) {
           context_.Say(*endName, "END PROGRAM name mismatch"_err_en_US)
-              .Attach(program->statement.v.source, "should be"_en_US);
+              .Attach(*progName, "should be"_en_US);
         }
       } else {
         context_.Say(*endName,

diff --git a/flang/test/Driver/cuda-option.f90 b/flang/test/Driver/cuda-option.f90
@@ -8,7 +8,7 @@ program main
   integer, device :: dvar
 end program
 
-! CHECK-LABEL: PROGRAM main
+! CHECK-LABEL: PROGRAM MAIN
 ! CHECK: INTEGER :: var = 1
 ! CHECK: INTEGER, DEVICE :: dvar
 

diff --git a/flang/test/Driver/unparse-use-analyzed.f95 b/flang/test/Driver/unparse-use-analyzed.f95
@@ -6,12 +6,12 @@
 ! RUN: %flang_fc1 -fdebug-unparse  %s | FileCheck %s --check-prefix=DEFAULT
 ! RUN: %flang_fc1 -fdebug-unparse -fno-analyzed-objects-for-unparse %s | FileCheck %s --check-prefix=DISABLED
 
-! DEFAULT: PROGRAM test
+! DEFAULT: PROGRAM TEST
 ! DEFAULT-NEXT:  REAL, PARAMETER :: val = 3.43e2_4
 ! DEFAULT-NEXT:  PRINT *, 3.47e2_4
 ! DEFAULT-NEXT: END PROGRAM
 
-! DISABLED: PROGRAM test
+! DISABLED: PROGRAM TEST
 ! DISABLED-NEXT:  REAL, PARAMETER :: val = 343.0
 ! DISABLED-NEXT:  PRINT *, val+4
 ! DISABLED-NEXT: END PROGRAM

diff --git a/flang/test/Driver/unparse-with-modules.f90 b/flang/test/Driver/unparse-with-modules.f90
@@ -25,7 +25,7 @@ program test
 !CHECK:  implicit none
 !CHECK:  real(kind=real32) x
 !CHECK: end module
-!CHECK: program test
+!CHECK: program TEST
 !CHECK:  use :: m1
 !CHECK:  use :: basictestmoduletwo
 !CHECK:  implicit none

diff --git a/flang/test/Integration/debug-common-block-1.f90 b/flang/test/Integration/debug-common-block-1.f90
@@ -89,7 +89,7 @@ program test
 ! CHECK-DAG: ![[CBF3]] = !DICommonBlock(scope: ![[F3]], declaration: null, name: "__BLNK__"{{.*}})
 ! CHECK-DAG: ![[CBAF3]] = !DICommonBlock(scope: ![[F3]], declaration: null, name: "a"{{.*}})
 
-! CHECK-DAG: ![[MAIN:[0-9]+]] = {{.*}}!DISubprogram(name: "test"{{.*}})
+! CHECK-DAG: ![[MAIN:[0-9]+]] = {{.*}}!DISubprogram(name: "TEST"{{.*}})
 ! CHECK-DAG: ![[CBM]] = !DICommonBlock(scope: ![[MAIN]], declaration: null, name: "__BLNK__"{{.*}})
 ! CHECK-DAG: ![[CBAM]] = !DICommonBlock(scope: ![[MAIN]], declaration: null, name: "a"{{.*}})
 

diff --git a/flang/test/Integration/debug-local-var-2.f90 b/flang/test/Integration/debug-local-var-2.f90
@@ -37,7 +37,7 @@
 ! BOTH-LABEL: }
 
 program mn
-! BOTH-DAG: ![[MAIN:.*]] = distinct !DISubprogram(name: "mn", {{.*}})
+! BOTH-DAG: ![[MAIN:.*]] = distinct !DISubprogram(name: "MN", {{.*}})
 
 ! BOTH-DAG: ![[TYI32:.*]] = !DIBasicType(name: "integer", size: 32, encoding: DW_ATE_signed)
 ! BOTH-DAG: ![[TYI64:.*]] = !DIBasicType(name: "integer", size: 64, encoding: DW_ATE_signed)

diff --git a/flang/test/Lower/CUDA/cuda-derived.cuf b/flang/test/Lower/CUDA/cuda-derived.cuf
@@ -25,6 +25,6 @@ program main
   type(t2) :: b
 end
 
-! CHECK-LABEL: func.func @_QQmain() attributes {fir.bindc_name = "main"}
+! CHECK-LABEL: func.func @_QQmain() attributes {fir.bindc_name = "MAIN"}
 ! CHECK: %{{.*}} = cuf.alloc !fir.type<_QMm1Tty_device{x:!fir.box<!fir.heap<!fir.array<?xi32>>>}> {bindc_name = "a", data_attr = #cuf.cuda<managed>, uniq_name = "_QFEa"}
 ! CHECK: %{{.*}} = cuf.alloc !fir.type<_QMm1Tt2{b:!fir.type<_QMm1Tt1{a:!fir.box<!fir.heap<!fir.array<?xf32>>>}>}> {bindc_name = "b", data_attr = #cuf.cuda<managed>, uniq_name = "_QFEb"}
diff --git a/flang/test/Lower/CUDA/cuda-return01.cuf b/flang/test/Lower/CUDA/cuda-return01.cuf
@@ -28,6 +28,6 @@ program main
   return
 end
 
-! CHECK-LABEL: func.func @_QQmain() attributes {fir.bindc_name = "main"}
+! CHECK-LABEL: func.func @_QQmain() attributes {fir.bindc_name = "MAIN"}
 ! CHECK: cuf.alloc !fir.box<!fir.heap<!fir.array<?xi32>>> {bindc_name = "a", data_attr = #cuf.cuda<device>, uniq_name = "_QFEa"} -> !fir.ref<!fir.box<!fir.heap<!fir.array<?xi32>>>>
 ! CHECK-NOT: cuf.free
diff --git a/flang/test/Lower/CUDA/cuda-return02.cuf b/flang/test/Lower/CUDA/cuda-return02.cuf
@@ -13,7 +13,7 @@ program test
   return
 end
 
-! CHECK: func.func @_QQmain() attributes {fir.bindc_name = "test"} {
+! CHECK: func.func @_QQmain() attributes {fir.bindc_name = "TEST"} {
 ! CHECK: %[[DECL:.*]]:2 = hlfir.declare
 ! CHECK: cf.cond_br %{{.*}}, ^bb1, ^bb2
 ! CHECK-NEXT: ^bb1:

diff --git a/flang/test/Lower/HLFIR/intrinsic-subroutines.f90 b/flang/test/Lower/HLFIR/intrinsic-subroutines.f90
@@ -24,7 +24,7 @@ program main
   call mvbits(from, 2, 2, to, 0)
   if (any(to /= 5)) STOP 1
 end program
-! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "main"} {
+! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "MAIN"} {
 ! CHECK:           %[[VAL_0:.*]] = arith.constant 3 : index
 ! CHECK:           %[[VAL_1:.*]] = fir.alloca !fir.array<3xi32> {bindc_name = "from", uniq_name = "_QFEfrom"}
 ! CHECK:           %[[VAL_2:.*]] = fir.shape %[[VAL_0]] : (index) -> !fir.shape<1>

diff --git a/flang/test/Lower/HLFIR/procedure-pointer-component-structure-constructor.f90 b/flang/test/Lower/HLFIR/procedure-pointer-component-structure-constructor.f90
@@ -35,7 +35,7 @@ FUNCTION BAR() RESULT(res)
     END
   END
 
-! CHECK-LABEL:  func.func @_QQmain() attributes {fir.bindc_name = "main"} {
+! CHECK-LABEL:  func.func @_QQmain() attributes {fir.bindc_name = "MAIN"} {
 ! CHECK:    %[[VAL_0:.*]] = fir.alloca !fir.type<_QMmTdt{pp1:!fir.boxproc<(!fir.ref<i32>) -> i32>}>
 ! CHECK:    %[[VAL_1:.*]] = fir.alloca !fir.type<_QMmTdt{pp1:!fir.boxproc<(!fir.ref<i32>) -> i32>}>
 ! CHECK:    %[[VAL_2:.*]] = fir.alloca !fir.boxproc<(!fir.ref<i32>) -> i32> {bindc_name = "pp2", uniq_name = "_QFEpp2"}

diff --git a/flang/test/Lower/OpenACC/acc-atomic-read.f90 b/flang/test/Lower/OpenACC/acc-atomic-read.f90
@@ -8,7 +8,7 @@ program acc_atomic_test
      g = h
 end program acc_atomic_test
 
-! CHECK: func @_QQmain() attributes {fir.bindc_name = "acc_atomic_test"} {
+! CHECK: func @_QQmain() attributes {fir.bindc_name = "ACC_ATOMIC_TEST"} {
 ! CHECK: %[[VAR_G:.*]] = fir.alloca f32 {bindc_name = "g", uniq_name = "_QFEg"}
 ! CHECK: %[[G_DECL:.*]]:2 = hlfir.declare %[[VAR_G]] {uniq_name = "_QFEg"} : (!fir.ref<f32>) -> (!fir.ref<f32>, !fir.ref<f32>)
 ! CHECK: %[[VAR_H:.*]] = fir.alloca f32 {bindc_name = "h", uniq_name = "_QFEh"}

diff --git a/flang/test/Lower/OpenACC/acc-atomic-write.f90 b/flang/test/Lower/OpenACC/acc-atomic-write.f90
@@ -2,7 +2,7 @@
 
 ! This test checks the lowering of atomic write
 
-!CHECK: func @_QQmain() attributes {fir.bindc_name = "acc_atomic_write_test"} {
+!CHECK: func @_QQmain() attributes {fir.bindc_name = "ACC_ATOMIC_WRITE_TEST"} {
 !CHECK: %[[VAR_X:.*]] = fir.alloca i32 {bindc_name = "x", uniq_name = "_QFEx"}
 !CHECK: %[[X_DECL:.*]]:2 = hlfir.declare %[[VAR_X]] {uniq_name = "_QFEx"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 !CHECK: %[[VAR_Y:.*]] = fir.alloca i32 {bindc_name = "y", uniq_name = "_QFEy"}

diff --git a/flang/test/Lower/OpenACC/acc-routine04.f90 b/flang/test/Lower/OpenACC/acc-routine04.f90
@@ -30,5 +30,5 @@ subroutine sub2()
 ! CHECK: acc.routine @acc_routine_1 func(@_QFPsub2) seq
 ! CHECK: acc.routine @acc_routine_0 func(@_QMdummy_modPsub1) seq
 ! CHECK: func.func @_QMdummy_modPsub1(%arg0: !fir.ref<i32> {fir.bindc_name = "i"}) attributes {acc.routine_info = #acc.routine_info<[@acc_routine_0]>}
-! CHECK: func.func @_QQmain() attributes {fir.bindc_name = "test_acc_routine"}
+! CHECK: func.func @_QQmain() attributes {fir.bindc_name = "TEST_ACC_ROUTINE"}
 ! CHECK: func.func private @_QFPsub2() attributes {acc.routine_info = #acc.routine_info<[@acc_routine_1]>, fir.host_symbol = @_QQmain, llvm.linkage = #llvm.linkage<internal>}
diff --git a/flang/test/Lower/OpenMP/atomic-read.f90 b/flang/test/Lower/OpenMP/atomic-read.f90
@@ -4,7 +4,7 @@
 
 ! This test checks the lowering of atomic read
 
-!CHECK: func @_QQmain() attributes {fir.bindc_name = "ompatomic"} {
+!CHECK: func @_QQmain() attributes {fir.bindc_name = "OMPATOMIC"} {
 !CHECK:    %[[A_REF:.*]] = fir.alloca i32 {bindc_name = "a", uniq_name = "_QFEa"}
 !CHECK:    %[[A_DECL:.*]]:2 = hlfir.declare %[[A_REF]] {uniq_name = "_QFEa"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 !CHECK:    %[[B_REF:.*]] = fir.alloca i32 {bindc_name = "b", uniq_name = "_QFEb"}

diff --git a/flang/test/Lower/OpenMP/atomic-write.f90 b/flang/test/Lower/OpenMP/atomic-write.f90
@@ -4,7 +4,7 @@
 
 ! This test checks the lowering of atomic write
 
-!CHECK: func @_QQmain() attributes {fir.bindc_name = "ompatomicwrite"} {
+!CHECK: func @_QQmain() attributes {fir.bindc_name = "OMPATOMICWRITE"} {
 !CHECK:    %[[X_REF:.*]] = fir.alloca i32 {bindc_name = "x", uniq_name = "_QFEx"}
 !CHECK:    %[[X_DECL:.*]]:2 = hlfir.declare %[[X_REF]] {uniq_name = "_QFEx"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 !CHECK:    %[[Y_REF:.*]] = fir.alloca i32 {bindc_name = "y", uniq_name = "_QFEy"}

diff --git a/flang/test/Lower/OpenMP/common-atomic-lowering.f90 b/flang/test/Lower/OpenMP/common-atomic-lowering.f90
@@ -1,6 +1,6 @@
 !RUN: %flang_fc1 -emit-hlfir -fopenmp %s -o - | FileCheck %s
 
-!CHECK: func.func @_QQmain() attributes {fir.bindc_name = "sample"} {
+!CHECK: func.func @_QQmain() attributes {fir.bindc_name = "SAMPLE"} {
 !CHECK: %[[val_0:.*]] = fir.alloca i32 {bindc_name = "a", uniq_name = "_QFEa"}
 !CHECK: %[[val_1:.*]]:2 = hlfir.declare %[[val_0]] {uniq_name = "_QFEa"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 !CHECK: %[[val_2:.*]] = fir.alloca i32 {bindc_name = "b", uniq_name = "_QFEb"}

diff --git a/flang/test/Lower/OpenMP/cray-pointers02.f90 b/flang/test/Lower/OpenMP/cray-pointers02.f90
@@ -1,7 +1,7 @@
 ! Test lowering of Cray pointee references.
 ! RUN: flang -fc1 -emit-hlfir -fopenmp %s -o - 2>&1 | FileCheck %s
 
-! CHECK-LABEL: func.func @_QQmain() attributes {fir.bindc_name = "test_cray_pointers_02"}
+! CHECK-LABEL: func.func @_QQmain() attributes {fir.bindc_name = "TEST_CRAY_POINTERS_02"}
 program test_cray_pointers_02
     implicit none
 

diff --git a/flang/test/Lower/OpenMP/default-clause-byref.f90 b/flang/test/Lower/OpenMP/default-clause-byref.f90
@@ -34,7 +34,7 @@
 !CHECK:    omp.yield(%[[PRIV_X]] : !fir.ref<i32>)
 !CHECK:  }
 
-!CHECK: func @_QQmain() attributes {fir.bindc_name = "default_clause_lowering"} {
+!CHECK: func @_QQmain() attributes {fir.bindc_name = "DEFAULT_CLAUSE_LOWERING"} {
 !CHECK: %[[W:.*]] = fir.alloca i32 {bindc_name = "w", uniq_name = "_QFEw"}
 !CHECK: %[[W_DECL:.*]]:2 = hlfir.declare %[[W]] {uniq_name = "_QFEw"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 !CHECK: %[[X:.*]] = fir.alloca i32 {bindc_name = "x", uniq_name = "_QFEx"}

diff --git a/flang/test/Lower/OpenMP/default-clause.f90 b/flang/test/Lower/OpenMP/default-clause.f90
@@ -8,7 +8,7 @@
 ! RUN: | FileCheck %s
 
 
-!CHECK: func @_QQmain() attributes {fir.bindc_name = "default_clause_lowering"} {
+!CHECK: func @_QQmain() attributes {fir.bindc_name = "DEFAULT_CLAUSE_LOWERING"} {
 !CHECK: %[[W:.*]] = fir.alloca i32 {bindc_name = "w", uniq_name = "_QFEw"}
 !CHECK: %[[W_DECL:.*]]:2 = hlfir.declare %[[W]] {uniq_name = "_QFEw"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 !CHECK: %[[X:.*]] = fir.alloca i32 {bindc_name = "x", uniq_name = "_QFEx"}

diff --git a/flang/test/Lower/OpenMP/parallel-reduction-allocatable-array.f90 b/flang/test/Lower/OpenMP/parallel-reduction-allocatable-array.f90
@@ -80,7 +80,7 @@ program reduce
 ! CHECK:           omp.yield
 ! CHECK:         }
 
-! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "reduce"} {
+! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "REDUCE"} {
 ! CHECK:           %[[VAL_0:.*]] = fir.address_of(@_QFEi) : !fir.ref<i32>
 ! CHECK:           %[[VAL_1:.*]]:2 = hlfir.declare %[[VAL_0]] {uniq_name = "_QFEi"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 ! CHECK:           %[[VAL_2:.*]] = fir.address_of(@_QFEr) : !fir.ref<!fir.box<!fir.heap<!fir.array<?xi32>>>>

diff --git a/flang/test/Lower/OpenMP/parallel-reduction-array-lb.f90 b/flang/test/Lower/OpenMP/parallel-reduction-array-lb.f90
@@ -68,7 +68,7 @@ program reduce
 ! CHECK:           omp.yield
 ! CHECK:         }
 
-! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "reduce"} {
+! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "REDUCE"} {
 ! CHECK:           %[[VAL_7:.*]] = fir.alloca !fir.box<!fir.array<3x2xi32>>
 ! CHECK:           %[[VAL_0:.*]] = fir.address_of(@_QFEi) : !fir.ref<!fir.array<3x2xi32>>
 ! CHECK:           %[[VAL_1:.*]] = arith.constant 2 : index

diff --git a/flang/test/Lower/OpenMP/parallel-reduction-array2.f90 b/flang/test/Lower/OpenMP/parallel-reduction-array2.f90
@@ -63,7 +63,7 @@ program reduce
 ! CHECK:           omp.yield
 ! CHECK:         }
 
-! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "reduce"} {
+! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "REDUCE"} {
 ! CHECK:           %[[VAL_0:.*]] = fir.address_of(@_QFEi) : !fir.ref<!fir.array<3xi32>>
 ! CHECK:           %[[VAL_1:.*]] = arith.constant 3 : index
 ! CHECK:           %[[VAL_2:.*]] = fir.shape %[[VAL_1]] : (index) -> !fir.shape<1>

diff --git a/flang/test/Lower/OpenMP/parallel-reduction-byref.f90 b/flang/test/Lower/OpenMP/parallel-reduction-byref.f90
@@ -18,7 +18,7 @@
 !CHECK:    fir.store %[[CR]] to %[[C0]] : !fir.ref<i32>
 !CHECK:    omp.yield(%[[C0]] : !fir.ref<i32>)
 !CHECK:  }
-!CHECK:  func.func @_QQmain() attributes {fir.bindc_name = "mn"} {
+!CHECK:  func.func @_QQmain() attributes {fir.bindc_name = "MN"} {
 !CHECK:    %[[RED_ACCUM_REF:[_a-z0-9]+]] = fir.alloca i32 {bindc_name = "i", uniq_name = "_QFEi"}
 !CHECK:    %[[RED_ACCUM_DECL:[_a-z0-9]+]]:2 = hlfir.declare %[[RED_ACCUM_REF]] {uniq_name = "_QFEi"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 !CHECK:    %[[C0:[_a-z0-9]+]] = arith.constant 0 : i32

diff --git a/flang/test/Lower/OpenMP/parallel-reduction-pointer-array.f90 b/flang/test/Lower/OpenMP/parallel-reduction-pointer-array.f90
@@ -82,7 +82,7 @@ program reduce
 ! CHECK:           omp.yield
 ! CHECK:         }
 
-! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "reduce"} {
+! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "REDUCE"} {
 ! CHECK:           %[[VAL_0:.*]] = fir.address_of(@_QFEi) : !fir.ref<i32>
 ! CHECK:           %[[VAL_1:.*]]:2 = hlfir.declare %[[VAL_0]] {uniq_name = "_QFEi"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 ! CHECK:           %[[VAL_2:.*]] = fir.address_of(@_QFEr) : !fir.ref<!fir.box<!fir.ptr<!fir.array<?xi32>>>>

diff --git a/flang/test/Lower/OpenMP/parallel-reduction-rename.f90 b/flang/test/Lower/OpenMP/parallel-reduction-rename.f90
@@ -25,7 +25,7 @@ end program main
 ! CHECK:           omp.yield(%[[VAL_2]] : i32)
 ! CHECK:         }
 
-! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "main"} {
+! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "MAIN"} {
 ! CHECK:           %[[VAL_0:.*]] = fir.alloca i32 {bindc_name = "n", uniq_name = "_QFEn"}
 ! CHECK:           %[[VAL_1:.*]]:2 = hlfir.declare %[[VAL_0]] {uniq_name = "_QFEn"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 ! CHECK:           %[[VAL_2:.*]] = arith.constant 0 : i32

diff --git a/flang/test/Lower/OpenMP/parallel-reduction.f90 b/flang/test/Lower/OpenMP/parallel-reduction.f90
@@ -10,7 +10,7 @@
 !CHECK:    %[[CR:[_a-z0-9]+]] = arith.addi %[[C0]], %[[C1]] : i32
 !CHECK:    omp.yield(%[[CR]] : i32)
 !CHECK:  }
-!CHECK:  func.func @_QQmain() attributes {fir.bindc_name = "mn"} {
+!CHECK:  func.func @_QQmain() attributes {fir.bindc_name = "MN"} {
 !CHECK:    %[[RED_ACCUM_REF:[_a-z0-9]+]] = fir.alloca i32 {bindc_name = "i", uniq_name = "_QFEi"}
 !CHECK:    %[[RED_ACCUM_DECL:[_a-z0-9]+]]:2 = hlfir.declare %[[RED_ACCUM_REF]] {uniq_name = "_QFEi"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 !CHECK:    %[[C0:[_a-z0-9]+]] = arith.constant 0 : i32

diff --git a/flang/test/Lower/OpenMP/sections.f90 b/flang/test/Lower/OpenMP/sections.f90
@@ -5,7 +5,7 @@
 ! RUN: %flang_fc1 -emit-hlfir %openmp_flags %s -o - | FileCheck %s
 ! RUN: bbc -hlfir -emit-hlfir %openmp_flags %s -o - | FileCheck %s
 
-!CHECK: func @_QQmain() attributes {fir.bindc_name = "sample"} {
+!CHECK: func @_QQmain() attributes {fir.bindc_name = "SAMPLE"} {
 !CHECK:   %[[COUNT:.*]] = fir.address_of(@_QFEcount) : !fir.ref<i32>
 !CHECK:   %[[COUNT_DECL:.*]]:2 = hlfir.declare %[[COUNT]] {uniq_name = "_QFEcount"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 !CHECK:   %[[ETA:.*]] = fir.alloca f32 {bindc_name = "eta", uniq_name = "_QFEeta"}

diff --git a/flang/test/Lower/OpenMP/threadprivate-host-association-2.f90 b/flang/test/Lower/OpenMP/threadprivate-host-association-2.f90
@@ -3,7 +3,7 @@
 
 !RUN: %flang_fc1 -emit-hlfir -fopenmp %s -o - | FileCheck %s
 
-!CHECK: func.func @_QQmain() attributes {fir.bindc_name = "main"} {
+!CHECK: func.func @_QQmain() attributes {fir.bindc_name = "MAIN"} {
 !CHECK:   %[[A:.*]] = fir.alloca i32 {bindc_name = "a", uniq_name = "_QFEa"}
 !CHECK:   %[[A_DECL:.*]]:2 = hlfir.declare %[[A]] {fortran_attrs = #fir.var_attrs<internal_assoc>, uniq_name = "_QFEa"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 !CHECK:   %[[A_ADDR:.*]] = fir.address_of(@_QFEa) : !fir.ref<i32>

diff --git a/flang/test/Lower/OpenMP/threadprivate-host-association-3.f90 b/flang/test/Lower/OpenMP/threadprivate-host-association-3.f90
@@ -3,7 +3,7 @@
 
 !RUN: %flang_fc1 -emit-hlfir -fopenmp %s -o - | FileCheck %s
 
-!CHECK: func.func @_QQmain() attributes {fir.bindc_name = "main"} {
+!CHECK: func.func @_QQmain() attributes {fir.bindc_name = "MAIN"} {
 !CHECK:   %[[A:.*]] = fir.alloca i32 {bindc_name = "a", uniq_name = "_QFEa"}
 !CHECK:   %[[A_DECL:.*]]:2 = hlfir.declare %[[A]] {fortran_attrs = #fir.var_attrs<internal_assoc>, uniq_name = "_QFEa"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 !CHECK:   %[[A_ADDR:.*]] = fir.address_of(@_QFEa) : !fir.ref<i32>

diff --git a/flang/test/Lower/OpenMP/threadprivate-host-association.f90 b/flang/test/Lower/OpenMP/threadprivate-host-association.f90
@@ -3,7 +3,7 @@
 
 !RUN: %flang_fc1 -emit-hlfir -fopenmp %s -o - | FileCheck %s
 
-!CHECK: func.func @_QQmain() attributes {fir.bindc_name = "main"} {
+!CHECK: func.func @_QQmain() attributes {fir.bindc_name = "MAIN"} {
 !CHECK:   %[[A:.*]] = fir.address_of(@_QFEa) : !fir.ref<i32>
 !CHECK:   %[[A_DECL:.*]]:2 = hlfir.declare %[[A]] {fortran_attrs = #fir.var_attrs<internal_assoc>, uniq_name = "_QFEa"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 !CHECK:   %[[TP_A:.*]] = omp.threadprivate %[[A_DECL]]#0 : !fir.ref<i32> -> !fir.ref<i32>

diff --git a/flang/test/Lower/OpenMP/wsloop-chunks.f90 b/flang/test/Lower/OpenMP/wsloop-chunks.f90
@@ -7,7 +7,7 @@ program wsloop
         integer :: i
         integer :: chunk
 
-! CHECK-LABEL: func.func @_QQmain() attributes {fir.bindc_name = "wsloop"} {
+! CHECK-LABEL: func.func @_QQmain() attributes {fir.bindc_name = "WSLOOP"} {
 ! CHECK:         %[[CHUNK_REF:.*]] = fir.alloca i32 {bindc_name = "chunk", uniq_name = "_QFEchunk"}
 ! CHECK:         %[[VAL_0:.*]]:2 = hlfir.declare %[[CHUNK_REF]] {uniq_name = "_QFEchunk"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 

diff --git a/flang/test/Lower/OpenMP/wsloop-collapse.f90 b/flang/test/Lower/OpenMP/wsloop-collapse.f90
@@ -2,7 +2,7 @@
 
 ! RUN: bbc -fopenmp -emit-hlfir %s -o - | FileCheck %s
 
-!CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "wsloop_collapse"} {
+!CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "WSLOOP_COLLAPSE"} {
 program wsloop_collapse
 !CHECK:           %[[VAL_6:.*]] = fir.alloca i32 {bindc_name = "a", uniq_name = "_QFEa"}
 !CHECK:           %[[VAL_7:.*]]:2 = hlfir.declare %[[VAL_6]] {uniq_name = "_QFEa"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)

diff --git a/flang/test/Lower/OpenMP/wsloop-reduction-allocatable-array-minmax.f90 b/flang/test/Lower/OpenMP/wsloop-reduction-allocatable-array-minmax.f90
@@ -156,7 +156,7 @@ program reduce15
 ! CHECK:           omp.yield
 ! CHECK:         }
 
-! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "reduce15"} {
+! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "REDUCE15"} {
 ! CHECK:           %[[VAL_0:.*]] = fir.address_of(@_QFEarr) : !fir.ref<!fir.box<!fir.heap<!fir.array<?xi32>>>>
 ! CHECK:           %[[VAL_1:.*]]:2 = hlfir.declare %[[VAL_0]] {fortran_attrs = {{.*}}<allocatable>, uniq_name = "_QFEarr"} : (!fir.ref<!fir.box<!fir.heap<!fir.array<?xi32>>>>) -> (!fir.ref<!fir.box<!fir.heap<!fir.array<?xi32>>>>, !fir.ref<!fir.box<!fir.heap<!fir.array<?xi32>>>>)
 ! CHECK:           %[[VAL_2:.*]] = fir.alloca i32 {bindc_name = "i", uniq_name = "_QFEi"}

diff --git a/flang/test/Lower/OpenMP/wsloop-reduction-allocatable.f90 b/flang/test/Lower/OpenMP/wsloop-reduction-allocatable.f90
@@ -63,7 +63,7 @@ program reduce
 ! CHECK:           omp.yield
 ! CHECK:         }
 
-! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "reduce"} {
+! CHECK-LABEL:   func.func @_QQmain() attributes {fir.bindc_name = "REDUCE"} {
 ! CHECK:           %[[VAL_0:.*]] = fir.address_of(@_QFEi) : !fir.ref<i32>
 ! CHECK:           %[[VAL_1:.*]]:2 = hlfir.declare %[[VAL_0]] {uniq_name = "_QFEi"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
 ! CHECK:           %[[VAL_2:.*]] = fir.alloca !fir.box<!fir.heap<i32>> {bindc_name = "r", uniq_name = "_QFEr"}