linux-kernel - [PATCH v3 2/5] kbuild: implement {gcc,clang}-min-version only with built-in functions

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Message-Id: <20221126225624.751661-2-masahiroy@kernel.org>
Date:   Sun, 27 Nov 2022 07:56:21 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nicolas Schier <nicolas@...sle.eu>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, llvm@...ts.linux.dev
Subject: [PATCH v3 2/5] kbuild: implement {gcc,clang}-min-version only with built-in functions

Converting clang-min-version is straightforward because the versions
are always 6-digit.

gcc-min-version is somewhat tricky because the minimal GCC version
is GCC 5.1; prepend '0' to the version that is less than 10 so that
test-ge is always passed with 6-digit versions.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Reviewed-by: Nicolas Schier <nicolas@...sle.eu>
---

Changes in v3:
  - Add comments

Changes in v2:
  - Covert gcc-min-version in a different way

 scripts/Makefile.compiler | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
index 20d353dcabfb..4c095beda093 100644
--- a/scripts/Makefile.compiler
+++ b/scripts/Makefile.compiler
@@ -63,11 +63,16 @@ cc-disable-warning = $(call try-run,\
 
 # gcc-min-version
 # Usage: cflags-$(call gcc-min-version, 70100) += -foo
-gcc-min-version = $(shell [ $(CONFIG_GCC_VERSION)0 -ge $(1)0 ] && echo y)
+
+# Preprend 0 to the version that is less than 10 so test-ge works.
+# This will break when GCC 20 is released. Remove this workaround until then.
+gcc-min-version = $(call test-ge, \
+                  $(or $(filter 1%, $(CONFIG_GCC_VERSION)), 0$(CONFIG_GCC_VERSION)), \
+                  $(or $(filter 1%, $1), 0$(strip $1)))
 
 # clang-min-version
 # Usage: cflags-$(call clang-min-version, 110000) += -foo
-clang-min-version = $(shell [ $(CONFIG_CLANG_VERSION)0 -ge $(1)0 ] && echo y)
+clang-min-version = $(call test-ge, $(CONFIG_CLANG_VERSION), $1)
 
 # ld-option
 # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
-- 
2.34.1