commit 4dcc9a88448a65a1e855228917cfbb92ac4b4f45
author Kees Cook <keescook@chromium.org> Thu Apr 02 01:18:37 2020 -0700
committer Masahiro Yamada <masahiroy@kernel.org> Thu Apr 09 00:13:45 2020 +0900
tree 0aeaf77d289824565442a1c352e6dc0c5624fdf3
parent 60969f02f07ae1445730c7b293c421d179da729c

kbuild: mkcompile_h: Include $LD version in /proc/version

When doing Clang builds of the kernel, it is possible to link with
either ld.bfd (binutils) or ld.lld (LLVM), but it is not possible to
discover this from a running kernel. Add the "$LD -v" output to
/proc/version.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Fangrui Song <maskray@google.com>
Reviewed-by: Sedat Dilek <sedat.dilek@gmail.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/mkcompile_h

diff --git a/scripts/mkcompile_h b/scripts/mkcompile_h
index 3ff26e5..5b80a46 100755
--- a/scripts/mkcompile_h
+++ b/scripts/mkcompile_h
@@ -7,6 +7,7 @@
 PREEMPT=$4
 PREEMPT_RT=$5
 CC=$6
+LD=$7
 
 vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
 
@@ -61,7 +62,10 @@
   printf '#define LINUX_COMPILE_BY "%s"\n' "$LINUX_COMPILE_BY"
   echo \#define LINUX_COMPILE_HOST \"$LINUX_COMPILE_HOST\"
 
-  echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//'`\"
+  CC_VERSION=$($CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//')
+  LD_VERSION=$($LD -v | head -n1 | sed 's/(compatible with [^)]*)//' \
+		      | sed 's/[[:space:]]*$//')
+  printf '#define LINUX_COMPILER "%s"\n' "$CC_VERSION, $LD_VERSION"
 } > .tmpcompile
 
 # Only replace the real compile.h if the new one is different,