From c7c3e39e4faa6fe4f6868b8bf83ee20bda5a5faf Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 2 Jun 2022 16:14:20 -0400
Subject: Utilities: Activate POSIX APIs even without compiler extensions

Compile some third-party libraries with preprocessor definitions that
activate POSIX APIs even when compiler extensions are not enabled.
We already do this in libuv, inherited from the upstream buildsystem.

This extends commit f034b0f663 (CMake compilation: do not use compiler
extensions, 2020-03-14, v3.18.0-rc1~494^2).

Issue: #20454
---
 Utilities/cmbzip2/CMakeLists.txt      |  8 ++++++++
 Utilities/cmcurl/CMakeLists.txt       | 14 ++++++++++++++
 Utilities/cmlibarchive/CMakeLists.txt | 10 ++++++++++
 Utilities/cmliblzma/CMakeLists.txt    |  8 ++++++++
 4 files changed, 40 insertions(+)

diff --git a/Utilities/cmbzip2/CMakeLists.txt b/Utilities/cmbzip2/CMakeLists.txt
index 52efe14..1d7b265 100644
--- a/Utilities/cmbzip2/CMakeLists.txt
+++ b/Utilities/cmbzip2/CMakeLists.txt
@@ -8,6 +8,14 @@ elseif(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
 endif()
 
+# Activate POSIX APIs.
+if(CMAKE_SYSTEM_NAME MATCHES "^(AIX|OS400)$")
+  add_definitions(-D_ALL_SOURCE)
+endif()
+if(NOT CMAKE_SYSTEM_NAME MATCHES "BSD|Darwin|Windows")
+  add_definitions(-D_XOPEN_SOURCE=600)
+endif()
+
 add_definitions(-D_FILE_OFFSET_BITS=64)
 add_library(cmbzip2
   blocksort.c huffman.c crctable.c randtable.c compress.c decompress.c bzlib.c)
diff --git a/Utilities/cmcurl/CMakeLists.txt b/Utilities/cmcurl/CMakeLists.txt
index 2c0e873..f842270 100644
--- a/Utilities/cmcurl/CMakeLists.txt
+++ b/Utilities/cmcurl/CMakeLists.txt
@@ -119,6 +119,20 @@ elseif(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
 endif()
 
+# Activate POSIX APIs.
+if(CMAKE_SYSTEM_NAME MATCHES "^(AIX|OS400)$")
+  add_definitions(-D_ALL_SOURCE)
+endif()
+if(CMAKE_SYSTEM_NAME MATCHES "^(Linux)$")
+  add_definitions(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
+endif()
+if(CMAKE_SYSTEM_NAME MATCHES "^(SunOS)$")
+  add_definitions(-D__EXTENSIONS__)
+endif()
+if(NOT CMAKE_SYSTEM_NAME MATCHES "BSD|Darwin|Windows")
+  add_definitions(-D_XOPEN_SOURCE=600)
+endif()
+
 #***************************************************************************
 #                                  _   _ ____  _
 #  Project                     ___| | | |  _ \| |
diff --git a/Utilities/cmlibarchive/CMakeLists.txt b/Utilities/cmlibarchive/CMakeLists.txt
index 9ab7cec..eea472f 100644
--- a/Utilities/cmlibarchive/CMakeLists.txt
+++ b/Utilities/cmlibarchive/CMakeLists.txt
@@ -103,6 +103,16 @@ ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
 ENDIF()
 
+# Activate POSIX APIs.
+if(CMAKE_SYSTEM_NAME MATCHES "^(Linux)$")
+  add_definitions(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
+  string(APPEND CMAKE_REQUIRED_DEFINITIONS " -D_DEFAULT_SOURCE -D_BSD_SOURCE")
+endif()
+if(NOT CMAKE_SYSTEM_NAME MATCHES "BSD|Darwin|Windows")
+  add_definitions(-D_XOPEN_SOURCE=600)
+  string(APPEND CMAKE_REQUIRED_DEFINITIONS " -D_XOPEN_SOURCE=600")
+endif()
+
 IF(0) # CMake does not need flags specific to libarchive upstream development.
 if (CMAKE_BUILD_TYPE STREQUAL "Debug")
   OPTION(ENABLE_WERROR "Treat warnings as errors - default is ON for Debug, OFF otherwise." ON)
diff --git a/Utilities/cmliblzma/CMakeLists.txt b/Utilities/cmliblzma/CMakeLists.txt
index 0de1e97..3121fbe 100644
--- a/Utilities/cmliblzma/CMakeLists.txt
+++ b/Utilities/cmliblzma/CMakeLists.txt
@@ -166,6 +166,14 @@ ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
 ENDIF()
 
+# Activate POSIX APIs.
+if(CMAKE_SYSTEM_NAME MATCHES "^(AIX|OS400)$")
+  add_definitions(-D_ALL_SOURCE)
+endif()
+if(NOT CMAKE_SYSTEM_NAME MATCHES "BSD|Darwin|Windows")
+  add_definitions(-D_XOPEN_SOURCE=600)
+endif()
+
 ADD_LIBRARY(cmliblzma STATIC ${LZMA_SRCS})
 
 IF(CMAKE_C_COMPILER_ID STREQUAL "XL")
-- 
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