[Xen-changelog] [xen staging] xen: Have Kconfig check $(CC)'s version

[patchbot@xxxxxxx]

commit 534519f0514f52007d504e0f2eeb714de7b2468d
Author:     Anthony PERARD <anthony.perard@xxxxxxxxxx>
AuthorDate: Wed Dec 4 16:33:23 2019 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu Jan 30 11:54:33 2020 +0000

    xen: Have Kconfig check $(CC)'s version
    
    This import several files from Linux v5.3
     - scripts/Kconfig.include
     - scripts/clang-version.sh
     - scripts/gcc-version.sh
     and several config values from from Linux's init/Kconfig file.
    But gcc-version.sh have been modified to return "0" when $CC isn't
    GCC, like clang-version.sh do.
    
    Files are copied into scripts/ directory because that's were the files
    are found in Linux tree, and also because we are going to import more
    of Kbuild from Linux which is located in scripts/.
    
    CONFIG_GCC_VERSION and CONFIG_CC_IS_CLANG are going to be use in
    follow-up patches.
    
    Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/Kconfig                  | 16 ++++++++++++++++
 xen/Makefile                 |  2 ++
 xen/scripts/Kconfig.include  | 39 +++++++++++++++++++++++++++++++++++++++
 xen/scripts/clang-version.sh | 19 +++++++++++++++++++
 xen/scripts/gcc-version.sh   | 25 +++++++++++++++++++++++++
 5 files changed, 101 insertions(+)

diff --git a/xen/Kconfig b/xen/Kconfig
index 01067326b4..57427927ab 100644
--- a/xen/Kconfig
+++ b/xen/Kconfig
@@ -4,9 +4,25 @@
 #
 mainmenu "Xen/$(SRCARCH) $(XEN_FULLVERSION) Configuration"
 
+source "scripts/Kconfig.include"
+
 config BROKEN
        bool
 
+config CC_IS_GCC
+       def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
+
+config GCC_VERSION
+       int
+       default $(shell,$(BASEDIR)/scripts/gcc-version.sh $(CC))
+
+config CC_IS_CLANG
+       def_bool $(success,$(CC) --version | head -n 1 | grep -q clang)
+
+config CLANG_VERSION
+       int
+       default $(shell,$(BASEDIR)/scripts/clang-version.sh $(CC))
+
 source "arch/$(SRCARCH)/Kconfig"
 
 config DEFCONFIG_LIST
diff --git a/xen/Makefile b/xen/Makefile
index efbe9605e5..c326fee588 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -18,6 +18,8 @@ export XEN_CONFIG_EXPERT ?= n
 PYTHON_INTERPRETER     := $(word 1,$(shell which python3 python python2 
2>/dev/null) python)
 export PYTHON          ?= $(PYTHON_INTERPRETER)
 
+export CC CXX LD
+
 export BASEDIR := $(CURDIR)
 export XEN_ROOT := $(BASEDIR)/..
 
diff --git a/xen/scripts/Kconfig.include b/xen/scripts/Kconfig.include
new file mode 100644
index 0000000000..8221095ca3
--- /dev/null
+++ b/xen/scripts/Kconfig.include
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Kconfig helper macros
+
+# Convenient variables
+comma       := ,
+quote       := "
+squote      := '
+empty       :=
+space       := $(empty) $(empty)
+dollar      := $
+right_paren := )
+left_paren  := (
+
+# $(if-success,<command>,<then>,<else>)
+# Return <then> if <command> exits with 0, <else> otherwise.
+if-success = $(shell,{ $(1); } >/dev/null 2>&1 && echo "$(2)" || echo "$(3)")
+
+# $(success,<command>)
+# Return y if <command> exits with 0, n otherwise
+success = $(if-success,$(1),y,n)
+
+# $(failure,<command>)
+# Return n if <command> exits with 0, y otherwise
+failure = $(if-success,$(1),n,y)
+
+# $(cc-option,<flag>)
+# Return y if the compiler supports <flag>, n otherwise
+cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -E -x c /dev/null -o 
/dev/null)
+
+# $(ld-option,<flag>)
+# Return y if the linker supports <flag>, n otherwise
+ld-option = $(success,$(LD) -v $(1))
+
+# check if $(CC) and $(LD) exist
+$(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found)
+$(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found)
+
+# gcc version including patch level
+gcc-version := $(shell,$(BASEDIR)/scripts/gcc-version.sh $(CC))
diff --git a/xen/scripts/clang-version.sh b/xen/scripts/clang-version.sh
new file mode 100755
index 0000000000..6fabf06957
--- /dev/null
+++ b/xen/scripts/clang-version.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# clang-version clang-command
+#
+# Print the compiler version of `clang-command' in a 5 or 6-digit form
+# such as `50001' for clang-5.0.1 etc.
+
+compiler="$*"
+
+if ! ( $compiler --version | grep -q clang) ; then
+       echo 0
+       exit 1
+fi
+
+MAJOR=$(echo __clang_major__ | $compiler -E -x c - | tail -n 1)
+MINOR=$(echo __clang_minor__ | $compiler -E -x c - | tail -n 1)
+PATCHLEVEL=$(echo __clang_patchlevel__ | $compiler -E -x c - | tail -n 1)
+printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL
diff --git a/xen/scripts/gcc-version.sh b/xen/scripts/gcc-version.sh
new file mode 100755
index 0000000000..b3261949de
--- /dev/null
+++ b/xen/scripts/gcc-version.sh
@@ -0,0 +1,25 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# gcc-version gcc-command
+#
+# Print the gcc version of `gcc-command' in a 5 or 6-digit form
+# such as `29503' for gcc-2.95.3, `30301' for gcc-3.3.1, etc.
+
+compiler="$*"
+
+if [ ${#compiler} -eq 0 ]; then
+       echo "Error: No compiler specified." >&2
+       printf "Usage:\n\t$0 <gcc-command>\n" >&2
+       exit 1
+fi
+
+if ! ( $compiler --version | head -n 1 | grep -q gcc ); then
+       echo 0
+       exit 1
+fi
+
+MAJOR=$(echo __GNUC__ | $compiler -E -x c - | tail -n 1)
+MINOR=$(echo __GNUC_MINOR__ | $compiler -E -x c - | tail -n 1)
+PATCHLEVEL=$(echo __GNUC_PATCHLEVEL__ | $compiler -E -x c - | tail -n 1)
+printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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