[flang][driver] Use --match-full-lines in tests for `-test-io`

[awarzynski]

Summary

Use --match-full-lines to make sure that FileCheck doesn't match the
output against the CHECK lines (which, like other comments, are also
printed).

More specifically, we want to make sure that the following check in the
input file:

! CHECK: <some-fortran-input>

is matched by FileCheck with <some-fortran-input> in the generated
output. Without --match-full-lines, that check-line will be matched
with !CHECK: <some-fortran-input> instead (which is also
printed together with other contents of the file).

Adding --match-full-lines makes the tests stricter and this change
revealed that some checks were passing only because that flag was
missing. These are updated accordingly.

[CarolineConcatto]

It looks good to me Andrzej.
As it is only test changes I do not expect this to be a problem outside flang.

flang/test/Frontend/input-output-file.f90

 ! RUN: rm -rf %S/input-output-file.txt
 
 ! REQUIRES: new-flang-driver
 
 !--------------------------
 ! FLANG DRIVER (flang-new)
 !--------------------------
 ! TEST 1: Print to stdout (implicit)
-! RUN: %flang-new -test-io %s  2>&1 | FileCheck %s
+! RUN: %flang-new -test-io %s  2>&1 | FileCheck %s --match-full-lines
 ! TEST 2: Print to stdout (explicit)
-! RUN: %flang-new -test-io -o - %s  2>&1 | FileCheck %s
+! RUN: %flang-new -test-io -o - %s  2>&1 | FileCheck %s --match-full-lines
 ! TEST 3: Print to a file
-! RUN: %flang-new -test-io -o %t %s 2>&1 && FileCheck %s --input-file=%t
+! RUN: %flang-new -test-io -o %t %s 2>&1 && FileCheck %s --match-full-lines --input-file=%t
 
 !----------------------------------------
 ! FLANG FRONTEND DRIVER (flang-new -fc1)
 !----------------------------------------
 ! TEST 4: Write to a file (implicit)
-! RUN: %flang-new -fc1 -test-io  %s 2>&1 && FileCheck %s --input-file=%S/input-output-file.txt
+! RUN: %flang-new -fc1 -test-io  %s 2>&1 && FileCheck %s --match-full-lines --input-file=%S/input-output-file.txt
 ! TEST 5: Write to a file (explicit)
-! RUN: %flang-new -fc1 -test-io  -o %t %s 2>&1 && FileCheck %s --input-file=%t
-
+! RUN: %flang-new -fc1 -test-io  -o %t %s 2>&1 && FileCheck %s --match-full-lines --input-file=%t
 
 !-----------------------
 ! EXPECTED OUTPUT
 !-----------------------
 ! CHECK-LABEL: Program arithmetic
 ! CHECK-NEXT:    Integer :: i, j
 ! CHECK-NEXT:    i = 2; j = 3; i= i * j;
 ! CHECK-NEXT:  End Program arithmetic
 
 Program arithmetic
   Integer :: i, j
   i = 2; j = 3; i= i * j;
-End Program arithmetic
+End Program arithmetic
 

flang/test/Frontend/multiple-input-files.f90

 ! RUN: rm -rf %S/multiple-input-files.txt  %S/Inputs/hello-world.txt
 
 ! REQUIRES: new-flang-driver
 
 !--------------------------
 ! FLANG DRIVER (flang-new)
 !--------------------------
 ! TEST 1: Both input files are processed (output is printed to stdout)
-! RUN: %flang-new -test-io %s %S/Inputs/hello-world.f90 | FileCheck %s  -check-prefix=flang-new
+! RUN: %flang-new -test-io %s %S/Inputs/hello-world.f90 | FileCheck %s --match-full-lines -check-prefix=FLANG
 
 ! TEST 2: None of the files is processed (not possible to specify the output file when multiple input files are present)
-! RUN: not %flang-new -test-io -o - %S/Inputs/hello-world.f90 %s  2>&1 | FileCheck %s -check-prefix=ERROR
-! RUN: not %flang-new -test-io -o %t %S/Inputs/hello-world.f90 %s 2>&1 | FileCheck %s -check-prefix=ERROR
+! RUN: not %flang-new -test-io -o - %S/Inputs/hello-world.f90 %s  2>&1 | FileCheck %s --match-full-lines -check-prefix=ERROR
+! RUN: not %flang-new -test-io -o %t %S/Inputs/hello-world.f90 %s 2>&1 | FileCheck %s --match-full-lines -check-prefix=ERROR
 
 !----------------------------------------
 ! FLANG FRONTEND DRIVER (flang-new -fc1)
 !----------------------------------------
 ! TEST 3: Both input files are processed
 ! RUN: %flang-new -fc1 -test-io  %S/Inputs/hello-world.f90 %s 2>&1 \
-! RUN:  && FileCheck %s --input-file=%S/multiple-input-files.txt -check-prefix=flang-new-FC1-OUTPUT1 
+! RUN:  && FileCheck %s --input-file=%S/multiple-input-files.txt --match-full-lines -check-prefix=FC1-OUTPUT1 \
+! RUN:  && FileCheck %s --input-file=%S/Inputs/hello-world.txt --match-full-lines -check-prefix=FC1-OUTPUT2
 
 ! TEST 4: Only the last input file is processed
-! RUN: %flang-new -fc1 -test-io  %S/Inputs/hello-world.f90 %s -o %t 2>&1 \
-! RUN:  && FileCheck %s --input-file=%t -check-prefix=flang-new-FC1-OUTPUT1
+! RUN: %flang-new -fc1 -test-io %s %S/Inputs/hello-world.f90 -o %t 2>&1 \
+! RUN:  && FileCheck %s --input-file=%t --match-full-lines -check-prefix=FC1-OUTPUT3
 
 !-----------------------
 ! EXPECTED OUTPUT
 !-----------------------
 ! TEST 1: By default, `flang-new` prints the output from all input files to
 ! stdout
-! flang-new-LABEL: Program arithmetic
-! flang-new-NEXT:    Integer :: i, j
-! flang-new-NEXT:    i = 2; j = 3; i= i * j;
-! flang-new-NEXT:  End Program arithmetic
-! flang-new-NEXT: !This is a test file with a hello world in Fortran
-! flang-new-NEXT:program hello
-! flang-new-NEXT:  implicit none
-! flang-new-NEXT:  write(*,*) 'Hello world!'
-! flang-new-NEXT:end program hello
-
+! FLANG-LABEL: Program arithmetic
+! FLANG-NEXT:    Integer :: i, j
+! FLANG-NEXT:    i = 2; j = 3; i= i * j;
+! FLANG-NEXT:  End Program arithmetic
+! FLANG-NEXT:!This is a test file with a hello world in Fortran
+! FLANG-NEXT:program hello
+! FLANG-NEXT:  implicit none
+! FLANG-NEXT:  write(*,*) 'Hello world!'
+! FLANG-NEXT:end program hello
 
 ! TEST 2: `-o` does not work for `flang-new` when multiple input files are present
-! ERROR:error: cannot specify -o when generating multiple output files
-
+! ERROR: flang-new: error: cannot specify -o when generating multiple output files
 
-! TEST 3 & TEST 4: Unless the output file is specified, `flang-new -fc1` generates one output file for every input file. If an
-! output file is specified (with `-o`), then only the last input file is processed.
-! flang-new-FC1-OUTPUT1-LABEL: Program arithmetic
-! flang-new-FC1-OUTPUT1-NEXT:    Integer :: i, j
-! flang-new-FC1-OUTPUT1-NEXT:    i = 2; j = 3; i= i * j;
-! flang-new-FC1-OUTPUT1-NEXT:  End Program arithmetic
-! flang-new-FC1-OUTPUT1-NEXT: !This is a test file with a hello world in Fortran
-! flang-new-FC1-OUTPUT1-NEXT:program hello
-! flang-new-FC1-OUTPUT1-NEXT:  implicit none
-! flang-new-FC1-OUTPUT1-NEXT:  write(*,*) 'Hello world!'
-! flang-new-FC1-OUTPUT1-NEXT:end program hello
+! TEST 3 The output file _was not_ specified - `flang-new -fc1` will process all
+! input files and generate one output file for every input file.
+! FC1-OUTPUT1-LABEL: Program arithmetic
+! FC1-OUTPUT1-NEXT:    Integer :: i, j
+! FC1-OUTPUT1-NEXT:    i = 2; j = 3; i= i * j;
+! FC1-OUTPUT1-NEXT:  End Program arithmetic
+
+! FC1-OUTPUT2-LABEL:!This is a test file with a hello world in Fortran
+! FC1-OUTPUT2-NEXT:program hello
+! FC1-OUTPUT2-NEXT:  implicit none
+! FC1-OUTPUT2-NEXT:  write(*,*) 'Hello world!'
+! FC1-OUTPUT2-NEXT:end program hello
+
+! TEST 4: The output file _was_ specified - `flang-new -fc1` will process only
+! only the last input file and generate the corresponding output.
+! FC1-OUTPUT3-LABEL:!This is a test file with a hello world in Fortran
+! FC1-OUTPUT3-NEXT:program hello
+! FC1-OUTPUT3-NEXT:  implicit none
+! FC1-OUTPUT3-NEXT:  write(*,*) 'Hello world!'
+! FC1-OUTPUT3-NEXT:end program hello
 
 
 Program arithmetic
   Integer :: i, j
   i = 2; j = 3; i= i * j;
 End Program arithmetic