[gentoo-dev] [PATCH] toolchain-funcs: Add tc-ld-is-lld helper.

[Manoj Gupta <manojgupta@google.com>]

LLD is a new linker for LLVM project.
Add tc-ld-is-lld helper to be able to detect it.

Signed-off-by: Manoj Gupta <manojgupta@google.com>
---
 eclass/toolchain-funcs.eclass | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/eclass/toolchain-funcs.eclass b/eclass/toolchain-funcs.eclass
index 7bd90bb4e4a..e358d484417 100644
--- a/eclass/toolchain-funcs.eclass
+++ b/eclass/toolchain-funcs.eclass
@@ -453,6 +453,36 @@ tc-ld-is-gold() {
 	return 1
 }
 
+# @FUNCTION: tc-ld-is-lld
+# @USAGE: [toolchain prefix]
+# @DESCRIPTION:
+# Return true if the current linker is set to lld.
+tc-ld-is-lld() {
+	local out
+
+	# First check the linker directly.
+	out=$($(tc-getLD "$@") --version 2>&1)
+	if [[ ${out} == *"LLD"* ]] ; then
+		return 0
+	fi
+
+	# Then see if they're selecting lld via compiler flags.
+	# Note: We're assuming they're using LDFLAGS to hold the
+	# options and not CFLAGS/CXXFLAGS.
+	local base="${T}/test-tc-lld"
+	cat <<-EOF > "${base}.c"
+	int main() { return 0; }
+	EOF
+	out=$($(tc-getCC "$@") ${CFLAGS} ${CPPFLAGS} ${LDFLAGS} -Wl,--version "${base}.c" -o "${base}" 2>&1)
+	rm -f "${base}"*
+	if [[ ${out} == *"LLD"* ]] ; then
+		return 0
+	fi
+
+	# No lld here!
+	return 1
+}
+
 # @FUNCTION: tc-ld-disable-gold
 # @USAGE: [toolchain prefix]
 # @DESCRIPTION:
-- 
2.23.0.162.g0b9fbb3734-goog