xcompile,clang: increase the number of bracket-depth for CPP

Clang has a limit for the number of nested brackets in CPP.
For soc/intel/common/block/include/intelblocks this is a problem as it
largely exceeds the default limit of 256.

Change-Id: I93038f918e07f735394fc495a8ed7371cc5b1569
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62175
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/util/xcompile/xcompile b/util/xcompile/xcompile
index 4950a9e..e5e8098 100755
--- a/util/xcompile/xcompile
+++ b/util/xcompile/xcompile
@@ -238,6 +238,7 @@
 # tone down clang compiler warnings
 CLANG_CFLAGS_${TARCH}+=-Wno-unused-variable -Wno-unused-function -Wno-tautological-compare
 CLANG_CFLAGS_${TARCH}+=-Wno-shift-overflow -Wno-address-of-packed-member -Wno-initializer-overrides
+CLANG_CFLAGS_${TARCH}+=-fbracket-depth=2048
 CLANG_COMPILER_RT_${TARCH}:=${CC_RT_CLANG}
 CLANG_COMPILER_RT_FLAGS_${TARCH}:=${CC_RT_EXTRA_CLANG}