[clang] [flang] [Flang][Driver] Enable the -B option (PR #109965)

[Kiran Chandramohan via cfe-commits]

https://github.com/kiranchandramohan created https://github.com/llvm/llvm-project/pull/109965

The option provides the search prefix for executables, libraries and data files.

The option is implemented in the common portion of the Driver and only needs to be enabled in Flang. Test added is a copy of the relevant test in Clang.

>From a0cd82be4e7e2343a0116e7707bf658ecc87c96a Mon Sep 17 00:00:00 2001
From: Kiran Chandramohan <kiran.chandramohan at arm.com>
Date: Wed, 25 Sep 2024 11:43:40 +0000
Subject: [PATCH] [Flang][Driver] Enable the -B option

The option provides the search prefix for executables, libraries
and data files.

The option is implemented in the common portion of the Driver and
only needs to be enabled in Flang. Test added is a copy of the
relevant test in Clang.
---
 clang/include/clang/Driver/Options.td                |  1 +
 flang/test/Driver/B-opt.c                            | 12 ++++++++++++
 .../Inputs/B_opt_tree/dir1/i386-unknown-linux-ld     |  0
 flang/test/Driver/Inputs/B_opt_tree/dir1/ld          |  0
 flang/test/Driver/Inputs/B_opt_tree/dir2/ld          |  0
 flang/test/Driver/Inputs/B_opt_tree/dir3/prefix-ld   |  0
 6 files changed, 13 insertions(+)
 create mode 100644 flang/test/Driver/B-opt.c
 create mode 100755 flang/test/Driver/Inputs/B_opt_tree/dir1/i386-unknown-linux-ld
 create mode 100755 flang/test/Driver/Inputs/B_opt_tree/dir1/ld
 create mode 100755 flang/test/Driver/Inputs/B_opt_tree/dir2/ld
 create mode 100755 flang/test/Driver/Inputs/B_opt_tree/dir3/prefix-ld

diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 002f60350543d9..020f4f92e8735a 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -816,6 +816,7 @@ def _DASH_DASH : Option<["--"], "", KIND_REMAINING_ARGS>,
 def A : JoinedOrSeparate<["-"], "A">, Flags<[RenderJoined]>,
   Group<gfortran_Group>;
 def B : JoinedOrSeparate<["-"], "B">, MetaVarName<"<prefix>">,
+    Visibility<[ClangOption, FlangOption]>,
     HelpText<"Search $prefix$file for executables, libraries, and data files. "
     "If $prefix is a directory, search $prefix/$file">;
 def gcc_install_dir_EQ : Joined<["--"], "gcc-install-dir=">,
diff --git a/flang/test/Driver/B-opt.c b/flang/test/Driver/B-opt.c
new file mode 100644
index 00000000000000..16f3b87aee65e6
--- /dev/null
+++ b/flang/test/Driver/B-opt.c
@@ -0,0 +1,12 @@
+// Check -B driver option.
+
+/// Target triple prefix is not detected for -B.
+// RUN: %flang %s -### -o %t.o -target i386-unknown-linux \
+// RUN:     -B %S/Inputs/B_opt_tree/dir1 -fuse-ld=ld 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-B-OPT-TRIPLE %s
+// CHECK-B-OPT-TRIPLE-NOT: "{{.*}}/Inputs/B_opt_tree/dir1{{/|\\\\}}i386-unknown-linux-ld"
+//
+// RUN: %flang %s -### -o %t.o -target i386-unknown-linux \
+// RUN:     -B %S/Inputs/B_opt_tree/dir2 -fuse-ld=ld 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-B-OPT-DIR %s
+// CHECK-B-OPT-DIR: "{{.*}}/Inputs/B_opt_tree/dir2{{/|\\\\}}ld" 
diff --git a/flang/test/Driver/Inputs/B_opt_tree/dir1/i386-unknown-linux-ld b/flang/test/Driver/Inputs/B_opt_tree/dir1/i386-unknown-linux-ld
new file mode 100755
index 00000000000000..e69de29bb2d1d6
diff --git a/flang/test/Driver/Inputs/B_opt_tree/dir1/ld b/flang/test/Driver/Inputs/B_opt_tree/dir1/ld
new file mode 100755
index 00000000000000..e69de29bb2d1d6
diff --git a/flang/test/Driver/Inputs/B_opt_tree/dir2/ld b/flang/test/Driver/Inputs/B_opt_tree/dir2/ld
new file mode 100755
index 00000000000000..e69de29bb2d1d6
diff --git a/flang/test/Driver/Inputs/B_opt_tree/dir3/prefix-ld b/flang/test/Driver/Inputs/B_opt_tree/dir3/prefix-ld
new file mode 100755
index 00000000000000..e69de29bb2d1d6