[build] Remove unused GLIBC_INCLUDE_PATH macro

This macro was previously substituted when generating `glibc.modulemap` file during the compiler build. Now Swift detects the location of Glibc dynamically and injects `glibc.modulemap` into it using LLVM VFS. The last usage of `GLIBC_INCLUDE_PATH` was removed in `78c0540b`.

This also removes `SWIFT_SDK_${sdk}_ARCH_${arch}_LIBC_INCLUDE_DIRECTORY` which doesn't have any usages left.

Author: egorzhdan

cmake/modules/SwiftConfigureSDK.cmake

@@ -61,12 +61,6 @@ function(_report_sdk prefix)
     endforeach()
   endif()
 
-  if(NOT prefix IN_LIST SWIFT_DARWIN_PLATFORMS)
-    foreach(arch ${SWIFT_SDK_${prefix}_ARCHITECTURES})
-      message(STATUS "  ${arch} libc header path: ${SWIFT_SDK_${prefix}_ARCH_${arch}_LIBC_INCLUDE_DIRECTORY}")
-    endforeach()
-  endif()
-
   message(STATUS "")
 endfunction()
 
@@ -336,7 +330,6 @@ macro(configure_sdk_unix name architectures)
     if("${prefix}" STREQUAL "ANDROID")
       swift_android_sysroot(android_sysroot)
       set(SWIFT_SDK_ANDROID_ARCH_${arch}_PATH "${android_sysroot}")
-      set(SWIFT_SDK_ANDROID_ARCH_${arch}_LIBC_INCLUDE_DIRECTORY "${android_sysroot}/usr/include" CACHE STRING "Path to C library headers")
 
       if("${arch}" STREQUAL "armv7")
         set(SWIFT_SDK_ANDROID_ARCH_${arch}_NDK_TRIPLE "arm-linux-androideabi")
@@ -366,12 +359,6 @@ macro(configure_sdk_unix name architectures)
     else()
       set(SWIFT_SDK_${prefix}_ARCH_${arch}_PATH "/" CACHE STRING "CMAKE_SYSROOT for ${prefix} ${arch}")
 
-      if("${prefix}" STREQUAL "HAIKU")
-        set(SWIFT_SDK_HAIKU_ARCH_${arch}_LIBC_INCLUDE_DIRECTORY "/system/develop/headers/posix" CACHE STRING "Path to C library headers")
-      else()
-        set(SWIFT_SDK_${prefix}_ARCH_${arch}_LIBC_INCLUDE_DIRECTORY "/usr/include" CACHE STRING "Path to C library headers")
-      endif()
-
       if("${prefix}" STREQUAL "LINUX")
         if(arch MATCHES "(armv5)")
           set(SWIFT_SDK_LINUX_ARCH_${arch}_TRIPLE "${arch}-unknown-linux-gnueabi")
@@ -420,7 +407,6 @@ macro(configure_sdk_unix name architectures)
         endif()
         set(SWIFT_SDK_WASI_ARCH_wasm32_PATH "${SWIFT_WASI_SYSROOT_PATH}")
         set(SWIFT_SDK_WASI_ARCH_wasm32_TRIPLE "wasm32-unknown-wasi")
-        set(SWIFT_SDK_WASI_ARCH_wasm32_LIBC_INCLUDE_DIRECTORY "${SWIFT_WASI_SYSROOT_PATH}/include")
       else()
         message(FATAL_ERROR "unknown Unix OS: ${prefix}")
       endif()

stdlib/public/Platform/CMakeLists.txt

@@ -142,8 +142,7 @@ foreach(sdk ${SWIFT_SDKS})
         SOURCE "${glibc_modulemap_source}"
         OUTPUT "${glibc_modulemap_out}"
         FLAGS
-            "-DCMAKE_SDK=${sdk}"
-            "-DGLIBC_INCLUDE_PATH=${SWIFT_SDK_${sdk}_ARCH_${arch}_LIBC_INCLUDE_DIRECTORY}")
+            "-DCMAKE_SDK=${sdk}")
 
     list(APPEND glibc_modulemap_target_list ${glibc_modulemap_target})
 
@@ -176,14 +175,10 @@ foreach(sdk ${SWIFT_SDKS})
        NOT (${sdk} STREQUAL ANDROID AND NOT "${SWIFT_ANDROID_NATIVE_SYSROOT}" STREQUAL ""))
       set(glibc_sysroot_relative_modulemap_out "${module_dir}/sysroot-relative-modulemaps/glibc.modulemap")
 
-      string(REPLACE "${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_ARCH_${arch}_PATH}"
-        "" absolute_libc_include_path "${SWIFT_SDK_${sdk}_ARCH_${arch}_LIBC_INCLUDE_DIRECTORY}")
-
       handle_gyb_source_single(glibc_modulemap_native_target
         SOURCE "${glibc_modulemap_source}"
         OUTPUT "${glibc_sysroot_relative_modulemap_out}"
-        FLAGS "-DCMAKE_SDK=${sdk}"
-              "-DGLIBC_INCLUDE_PATH=${absolute_libc_include_path}")
+        FLAGS "-DCMAKE_SDK=${sdk}")
 
       list(APPEND glibc_modulemap_target_list ${glibc_modulemap_native_target})
       set(glibc_modulemap_out ${glibc_sysroot_relative_modulemap_out})