[clang] [AIX][clang][driver] fix no-pthread option (PR #69363)

[David Tenty via cfe-commits]

https://github.com/daltenty created https://github.com/llvm/llvm-project/pull/69363

We don't properly check the boolean pthread option in the AIX toolchain, so we don't respect the no- form of the option.

>From 560bf7329998e88d0ba12a2030b376d4a5aa173b Mon Sep 17 00:00:00 2001
From: David Tenty <daltenty at ibm.com>
Date: Tue, 17 Oct 2023 11:53:55 -0400
Subject: [PATCH] [AIX][clang][driver] fix no-pthread option

We don't properly check the boolean pthread option in the AIX toolchain, so we don't
respect the no- form of the option.
---
 clang/lib/Driver/ToolChains/AIX.cpp |  3 ++-
 clang/test/Driver/aix-ld.c          | 27 +++++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Driver/ToolChains/AIX.cpp b/clang/lib/Driver/ToolChains/AIX.cpp
index 3e5ebafa15ebe1c..257c0e19a5c0093 100644
--- a/clang/lib/Driver/ToolChains/AIX.cpp
+++ b/clang/lib/Driver/ToolChains/AIX.cpp
@@ -303,7 +303,8 @@ void aix::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       }
 
       // Support POSIX threads if "-pthreads" or "-pthread" is present.
-      if (Args.hasArg(options::OPT_pthreads, options::OPT_pthread))
+      if (Args.hasArg(options::OPT_pthreads) ||
+          Args.hasFlag(options::OPT_pthread, options::OPT_no_pthread, false))
         CmdArgs.push_back("-lpthreads");
 
       if (D.CCCIsCXX())
diff --git a/clang/test/Driver/aix-ld.c b/clang/test/Driver/aix-ld.c
index 7e0f2bf91e06ee5..579d028b9a7a8de 100644
--- a/clang/test/Driver/aix-ld.c
+++ b/clang/test/Driver/aix-ld.c
@@ -109,6 +109,33 @@
 // CHECK-LD64-PTHREAD-NOT: "-lm"
 // CHECK-LD64-PTHREAD:     "-lc"
 
+// Check powerpc-ibm-aix7.1.0.0, 32-bit. Disable POSIX thread support.
+// RUN: %clang %s -### 2>&1 \
+// RUN:        -resource-dir=%S/Inputs/resource_dir \
+// RUN:        -pthread -no-pthread\
+// RUN:        --target=powerpc-ibm-aix7.1.0.0 \
+// RUN:        --sysroot %S/Inputs/aix_ppc_tree \
+// RUN:        --unwindlib=libunwind \
+// RUN:   | FileCheck --check-prefix=CHECK-LD32-NOPTHREAD %s
+// CHECK-LD32-NOPTHREAD-NOT: warning:
+// CHECK-LD32-NOPTHREAD:     "-cc1" "-triple" "powerpc-ibm-aix7.1.0.0"
+// CHECK-LD32-NOPTHREAD:     "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-LD32-NOPTHREAD:     "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-LD32-NOPTHREAD:     "{{.*}}ld{{(.exe)?}}"
+// CHECK-LD32-NOPTHREAD-NOT: "-bnso"
+// CHECK-LD32-NOPTHREAD:     "-b32"
+// CHECK-LD32-NOPTHREAD:     "-bpT:0x10000000" "-bpD:0x20000000"
+// CHECK-LD32-NOPTHREAD:     "[[SYSROOT]]/usr/lib{{/|\\\\}}crt0.o"
+// CHECK-LD32-NOPTHREAD:     "[[SYSROOT]]/usr/lib{{/|\\\\}}crti.o"
+// CHECK-LD32-NOPTHREAD-NOT: "-lc++"
+// CHECK-LD32-NOPTHREAD-NOT: "-lc++abi"
+// CHECK-LD32-NOPTHREAD:     "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}aix{{/|\\\\}}libclang_rt.builtins-powerpc.a"
+// CHECK-LD32-NOPTHREAD-NOT: "--as-needed"
+// CHECK-LD32-NOPTHREAD:     "-lunwind"
+// CHECK-LD32-NOPTHREAD-NOT: "--no-as-needed"
+// CHECK-LD32-NOPTHREAD-NOT: "-lm"
+// CHECK-LD32-NOPTHREAD:     "-lc"
+
 // Check powerpc-ibm-aix7.1.0.0, 32-bit. Enable profiling.
 // RUN: %clang %s -### 2>&1 \
 // RUN:        -resource-dir=%S/Inputs/resource_dir \