[Buildroot] [PATCH] toolchain: GCC bug 85862

[Matt Weber]

GCC < 7.x hangs while building libnss for the Microblaze Arch.

Discovered by
http://autobuild.buildroot.net/results/158e8ebb39713e1b436a5cc1a1916f46c30694df

Reported:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85862

Simlar to:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49218

Signed-off-by: Matthew Weber <matthew.weber at rockwellcollins.com>
---
 package/ecryptfs-utils/Config.in | 4 ++++
 package/libnss/Config.in         | 4 ++++
 toolchain/Config.in              | 8 ++++++++
 3 files changed, 16 insertions(+)

diff --git a/package/ecryptfs-utils/Config.in b/package/ecryptfs-utils/Config.in
index bb4cc64..9d4a905 100644
--- a/package/ecryptfs-utils/Config.in
+++ b/package/ecryptfs-utils/Config.in
@@ -7,6 +7,7 @@ config BR2_PACKAGE_ECRYPTFS_UTILS
 	depends on BR2_PACKAGE_LIBNSPR_ARCH_SUPPORT # libnss -> libnspr
 	depends on !BR2_MIPS_NABI32 # libnss
 	depends on !BR2_STATIC_LIBS # libnss, keyutils
+	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_85862 # microblaze specific & GCC < 7.x
 	select BR2_PACKAGE_KEYUTILS
 	select BR2_PACKAGE_LIBNSS
 	# runtime dependency only, some scripts are using the
@@ -35,3 +36,6 @@ comment "ecryptfs-utils needs a toolchain w/ threads, wchar, dynami library"
 	depends on BR2_USE_MMU
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_USE_WCHAR || \
 		BR2_STATIC_LIBS
+
+comment "ecryptfs selects libnss and libnss needs a toolchain not affected by GCC bug 85862"
+	depends on BR2_TOOLCHAIN_HAS_GCC_BUG_85862
diff --git a/package/libnss/Config.in b/package/libnss/Config.in
index 599c9a6..34ddb91 100644
--- a/package/libnss/Config.in
+++ b/package/libnss/Config.in
@@ -3,6 +3,7 @@ config BR2_PACKAGE_LIBNSS
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libnspr
 	depends on BR2_PACKAGE_LIBNSPR_ARCH_SUPPORT # libnspr
 	depends on !BR2_STATIC_LIBS
+	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_85862
 	select BR2_PACKAGE_LIBNSPR
 	select BR2_PACKAGE_SQLITE
 	select BR2_PACKAGE_ZLIB
@@ -18,3 +19,6 @@ config BR2_PACKAGE_LIBNSS
 comment "libnss needs a toolchain w/ threads, dynamic library"
 	depends on BR2_PACKAGE_LIBNSPR_ARCH_SUPPORT
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS
+
+comment "libnss needs a toolchain not affected by GCC bug 85862"
+	depends on BR2_TOOLCHAIN_HAS_GCC_BUG_85862
diff --git a/toolchain/Config.in b/toolchain/Config.in
index 121ddb4..2479a65 100644
--- a/toolchain/Config.in
+++ b/toolchain/Config.in
@@ -84,6 +84,14 @@ config BR2_TOOLCHAIN_HAS_GCC_BUG_64735
 	default y if BR2_m68k_cf5208
 	depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_7
 
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85862
+# An infinite loop exists in the find_base_term() logic of 6.x
+# on microblaze.  http://autobuild.buildroot.net/results/158e8ebb39713e1b436a5cc1a1916f46c30694df/
+config BR2_TOOLCHAIN_HAS_GCC_BUG_85862
+	bool
+	default y if BR2_microblaze
+	depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_7
+
 config BR2_TOOLCHAIN_HAS_NATIVE_RPC
 	bool
 
-- 
1.9.1