[xen staging-4.15] kconfig: detect LD implementation

[patchbot@xxxxxxx]

commit c92c99fdfaec7a740daba5ef97720af35d1008f7
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Tue Jun 7 14:20:25 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jun 7 14:20:25 2022 +0200

    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@xxxxxxxxxx>
    Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
    master commit: c70c4b624f85f7d4e28c70a804a0a3f20d73092b
    master date: 2022-05-02 08:50:39 +0200
---
 xen/Kconfig | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/xen/Kconfig b/xen/Kconfig
index bcbd2758e5..0c89afd50f 100644
--- 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)
--
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