kconfig: detect LD implementation

Detect GNU and LLVM ld implementations. This is required for further
patches that will introduce diverging behaviour depending on the
linker implementation in use.

Note that LLVM ld returns "compatible with GNU linkers" as part of the
version string, so be on the safe side and use '^' to only match at
the start of the line in case LLVM ever decides to change the text to
use "compatible with GNU ld" instead.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Michal Orzel <michal.orzel@arm.com>
Acked-by: Julien Grall <jgrall@amazon.com>
master commit: c70c4b624f85f7d4e28c70a804a0a3f20d73092b
master date: 2022-05-02 08:50:39 +0200

diff --git a/xen/Kconfig b/xen/Kconfig
index bcbd2758e5d37167ce4e4e7ba5d5ea43a04021cc..0c89afd50fcf9706df761c638738be8885b315d4 100644 (file)
--- a/xen/Kconfig
+++ b/xen/Kconfig
@@ -23,6 +23,12 @@ config CLANG_VERSION
        int
        default $(shell,$(BASEDIR)/scripts/clang-version.sh $(CC))
 
+config LD_IS_GNU
+       def_bool $(success,$(LD) --version | head -n 1 | grep -q "^GNU ld")
+
+config LD_IS_LLVM
+       def_bool $(success,$(LD) --version | head -n 1 | grep -q "^LLD")
+
 # -fvisibility=hidden reduces -fpic cost, if it's available
 config CC_HAS_VISIBILITY_ATTRIBUTE
        def_bool $(cc-option,-fvisibility=hidden)