Revert "Use C to force the POSIX (not GNU) overload of strerror_r to be selected" (#498)

This reverts commit baa8180.

Author: rintaro

Sources/TSCBasic/CMakeLists.txt

@@ -52,6 +52,8 @@ add_library(TSCBasic
   misc.swift)
 
 target_compile_options(TSCBasic PUBLIC
+  # Don't use GNU strerror_r on Android.
+  "$<$<PLATFORM_ID:Android>:SHELL:-Xcc -U_GNU_SOURCE>"
   # Ignore secure function warnings on Windows.
   "$<$<PLATFORM_ID:Windows>:SHELL:-Xcc -D_CRT_SECURE_NO_WARNINGS>")
 target_link_libraries(TSCBasic PRIVATE

Sources/TSCBasic/misc.swift

@@ -8,7 +8,6 @@
  See http://swift.org/CONTRIBUTORS.txt for Swift project authors
 */
 
-@_implementationOnly import TSCclibc
 import TSCLibc
 import Foundation
 #if os(Windows)
@@ -328,7 +327,7 @@ extension SystemError: CustomStringConvertible {
             var cap = 64
             while cap <= 16 * 1024 {
                 var buf = [Int8](repeating: 0, count: cap)
-                let err = TSCclibc.tsc_strerror_r(errno, &buf, buf.count)
+                let err = TSCLibc.strerror_r(errno, &buf, buf.count)
                 if err == EINVAL {
                     return "Unknown error \(errno)"
                 }

Sources/TSCclibc/CMakeLists.txt

@@ -7,7 +7,7 @@
 # See http://swift.org/CONTRIBUTORS.txt for Swift project authors
 
 add_library(TSCclibc STATIC
-  libc.c process.c strerror.c)
+  libc.c process.c)
 target_include_directories(TSCclibc PUBLIC
   include)
 target_compile_definitions(TSCclibc PRIVATE

Sources/TSCclibc/include/module.modulemap

@@ -2,6 +2,5 @@ module TSCclibc {
     header "TSCclibc.h"
     header "indexstore_functions.h"
     header "process.h"
-    header "strerror.h"
     export *
 }