[lldb][AIX] Minor AIX specific changes

[DhruvSrivastavaX]

This PR is in reference to porting LLDB on AIX.

Link to discussions on llvm discourse and github:

1. https://discourse.llvm.org/t/port-lldb-to-ibm-aix/80640
2. Extending LLDB to work on AIX #101657
   The complete changes for porting are present in this draft PR:
   Extending LLDB to work on AIX #102601

AIX build specific changes

[llvmbot]

@llvm/pr-subscribers-lldb

Author: Dhruv Srivastava (DhruvSrivastavaX)

Changes

This PR is in reference to porting LLDB on AIX.

Link to discussions on llvm discourse and github:

1. https://discourse.llvm.org/t/port-lldb-to-ibm-aix/80640
2. Extending LLDB to work on AIX #101657
   The complete changes for porting are present in this draft PR:
   Extending LLDB to work on AIX #102601

AIX build specific changes

---

Full diff: https://github.com/llvm/llvm-project/pull/132718.diff

2 Files Affected:

• (modified) lldb/source/Host/CMakeLists.txt (+4)
• (modified) lldb/source/Host/common/Host.cpp (+2)

diff --git a/lldb/source/Host/CMakeLists.txt b/lldb/source/Host/CMakeLists.txt
index 52ef67feeb6ab..a2ae6f1430c38 100644
--- a/lldb/source/Host/CMakeLists.txt
+++ b/lldb/source/Host/CMakeLists.txt
@@ -7,6 +7,10 @@ if (APPLE AND LLVM_ENABLE_LOCAL_SUBMODULE_VISIBILITY)
   endif()
 endif()
 
+if (UNIX AND ${CMAKE_SYSTEM_NAME} MATCHES "AIX")
+  add_definitions("-D_ALL_SOURCE")
+endif()
+
 macro(add_host_subdirectory group)
   list(APPEND HOST_SOURCES ${ARGN})
   source_group(${group} FILES ${ARGN})
diff --git a/lldb/source/Host/common/Host.cpp b/lldb/source/Host/common/Host.cpp
index 6e5a75128eb27..a08c97d8e22f8 100644
--- a/lldb/source/Host/common/Host.cpp
+++ b/lldb/source/Host/common/Host.cpp
@@ -19,7 +19,9 @@
 #include <pwd.h>
 #include <spawn.h>
 #include <sys/stat.h>
+#ifndef _AIX
 #include <sys/syscall.h>
+#endif
 #include <sys/wait.h>
 #include <unistd.h>
 #endif