gcc8: fix build w/glibc-2.31

pkgs/development/compilers/gcc/8/0001-Fix-build-with-glibc-2.31.patch

@@ -0,0 +1,61 @@
+From 8d87a4ae8d48e837082198ea985241aaf5ecfbcb Mon Sep 17 00:00:00 2001
+From: Maximilian Bosch <[email protected]>
+Date: Thu, 20 Feb 2020 17:26:04 +0100
+Subject: [PATCH] Fix build with glibc 2.31
+
+---
+ .../sanitizer_platform_limits_posix.cc            |  5 +++--
+ .../sanitizer_platform_limits_posix.h             | 15 +--------------
+ 2 files changed, 4 insertions(+), 16 deletions(-)
+
+diff --git a/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc b/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
+index a915d37cd..5c720b2e7 100644
+--- a/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
++++ b/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
+@@ -1147,8 +1147,9 @@ CHECK_SIZE_AND_OFFSET(ipc_perm, uid);
+ CHECK_SIZE_AND_OFFSET(ipc_perm, gid);
+ CHECK_SIZE_AND_OFFSET(ipc_perm, cuid);
+ CHECK_SIZE_AND_OFFSET(ipc_perm, cgid);
+-#if !defined(__aarch64__) || !SANITIZER_LINUX || __GLIBC_PREREQ (2, 21)
+-/* On aarch64 glibc 2.20 and earlier provided incorrect mode field.  */
++#if !SANITIZER_LINUX || __GLIBC_PREREQ (2, 31)
++/* glibc 2.30 and earlier provided 16-bit mode field instead of 32-bit
++   on many architectures.  */
+ CHECK_SIZE_AND_OFFSET(ipc_perm, mode);
+ #endif
+
+diff --git a/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h b/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
+index 4d11d0717..9c1429623 100644
+--- a/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
++++ b/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
+@@ -210,26 +210,13 @@ namespace __sanitizer {
+     u64 __unused1;
+     u64 __unused2;
+ #elif defined(__sparc__)
+-#if defined(__arch64__)
+     unsigned mode;
+-    unsigned short __pad1;
+-#else
+-    unsigned short __pad1;
+-    unsigned short mode;
+     unsigned short __pad2;
+-#endif
+     unsigned short __seq;
+     unsigned long long __unused1;
+     unsigned long long __unused2;
+-#elif defined(__mips__) || defined(__aarch64__) || defined(__s390x__)
+-    unsigned int mode;
+-    unsigned short __seq;
+-    unsigned short __pad1;
+-    unsigned long __unused1;
+-    unsigned long __unused2;
+ #else
+-    unsigned short mode;
+-    unsigned short __pad1;
++    unsigned int mode;
+     unsigned short __seq;
+     unsigned short __pad2;
+ #if defined(__x86_64__) && !defined(_LP64)
+-- 
+2.25.0
+

pkgs/development/compilers/gcc/8/default.nix

@@ -47,8 +47,8 @@ let majorVersion = "8";
 
     inherit (stdenv) buildPlatform hostPlatform targetPlatform;
 
-    patches =
-         optional (targetPlatform != hostPlatform) ../libstdc++-target.patch
+    patches = [ ./0001-Fix-build-with-glibc-2.31.patch ]
+      ++ optional (targetPlatform != hostPlatform) ../libstdc++-target.patch
       ++ optional noSysDirs ../no-sys-dirs.patch
       /* ++ optional (hostPlatform != buildPlatform) (fetchpatch { # XXX: Refine when this should be applied
         url = "https://git.busybox.net/buildroot/plain/package/gcc/${version}/0900-remove-selftests.patch?id=11271540bfe6adafbc133caf6b5b902a816f5f02";