mirror of
https://github.com/xen-project/xen.git
synced 2026-10-28 10:11:27 +01:00
Julien Grall
4000522008
Right now, all tools and hypervisor will be complied with the option -Wdeclaration-after-statement. While most of the code in the hypervisor is controlled by us, for tools we may import external libraries. The build will fail if one of them are using the construct we are trying to prevent. This is the case when building against Python 3.12 and Yocto: | In file included from /srv/storage/alex/yocto/build-virt/tmp/work/core2-64-poky-linux/xen-tools/4.17+stable/recipe-sysroot/usr/include/python3.12/Python.h:44, | from xen/lowlevel/xc/xc.c:8: | /srv/storage/alex/yocto/build-virt/tmp/work/core2-64-poky-linux/xen-tools/4.17+stable/recipe-sysroot/usr/include/python3.12/object.h: In function 'Py_SIZE': | /srv/storage/alex/yocto/build-virt/tmp/work/core2-64-poky-linux/xen-tools/4.17+stable/recipe-sysroot/usr/include/python3.12/object.h:233:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement] | 233 | PyVarObject *var_ob = _PyVarObject_CAST(ob); | | ^~~~~~~~~~~ | In file included from /srv/storage/alex/yocto/build-virt/tmp/work/core2-64-poky-linux/xen-tools/4.17+stable/recipe-sysroot/usr/include/python3.12/Python.h:53: | /srv/storage/alex/yocto/build-virt/tmp/work/core2-64-poky-linux/xen-tools/4.17+stable/recipe-sysroot/usr/include/python3.12/cpython/longintrepr.h: In function '_PyLong_CompactValue': | /srv/storage/alex/yocto/build-virt/tmp/work/core2-64-poky-linux/xen-tools/4.17+stable/recipe-sysroot/usr/include/python3.12/cpython/longintrepr.h:121:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement] | 121 | Py_ssize_t sign = 1 - (op->long_value.lv_tag & _PyLong_SIGN_MASK); | | ^~~~~~~~~~ | cc1: all warnings being treated as errors Looking at the tools directory, a fair few directory already add -Wno-declaration-after-statement to inhibit the default behavior. We have always build the hypervisor with the flag, so for now remove only the flag for anything but the hypervisor. We can decide at later time whether we want to relax. Also remove the -Wno-declaration-after-statement in some subdirectory as the flag is now unnecessary. Part of the commit message was take from Alexander's first proposal: Link: https://lore.kernel.org/xen-devel/20231128174729.3880113-1-alex@linutronix.de/ Reported-by: Alexander Kanavin <alex@linutronix.de> Acked-by: Anthony PERARD <anthony.perard@citrix.com> Acked-by: Andrew Cooper <andrew.cooper3@citrix.com> Tested-by: Jason Andryuk <jandryuk@gmail.com> Signed-off-by: Julien Grall <jgrall@amazon.com> xen/hypervisor: Don't use cc-option-add for -Wdeclaration-after-statement Per Andrew's comment in [1] all the compilers we support should recognize the flag. I forgot to address the comment while committing. [1] fcf00090-304a-49f7-8a61-a54347e90a3b@citrix.com Signed-off-by: Julien Grall <jgrall@amazon.com> master commit:40be6307ecmaster date: 2023-12-06 19:12:40 +0000 master commit:d4bfd38998master date: 2023-12-06 19:19:59 +0000
256 lines
8.5 KiB
Makefile
256 lines
8.5 KiB
Makefile
# -*- mode: Makefile; -*-
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ifeq ($(filter /%,$(XEN_ROOT)),)
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$(error XEN_ROOT must be absolute)
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endif
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# Convenient variables
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comma := ,
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open := (
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close := )
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squote := '
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#' Balancing squote, to help syntax highlighting
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empty :=
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space := $(empty) $(empty)
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# fallback for older make
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realpath = $(wildcard $(foreach file,$(1),$(shell cd -P $(dir $(file)) && echo "$$PWD/$(notdir $(file))")))
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or = $(if $(strip $(1)),$(1),$(if $(strip $(2)),$(2),$(if $(strip $(3)),$(3),$(if $(strip $(4)),$(4)))))
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-include $(XEN_ROOT)/.config
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ifeq ($(origin XEN_COMPILE_ARCH), undefined)
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XEN_COMPILE_ARCH := $(shell uname -m | sed -e s/i.86/x86_32/ \
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-e s/i86pc/x86_32/ -e s/amd64/x86_64/ \
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-e s/armv7.*/arm32/ -e s/armv8.*/arm64/ \
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-e s/aarch64/arm64/)
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endif
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XEN_TARGET_ARCH ?= $(XEN_COMPILE_ARCH)
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ifeq ($(origin XEN_OS), undefined)
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XEN_OS := $(shell uname -s)
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endif
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CONFIG_$(XEN_OS) := y
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SHELL ?= /bin/sh
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# Tools to run on system hosting the build
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HOSTCFLAGS = -Wall -Werror -Wstrict-prototypes -O2 -fomit-frame-pointer
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HOSTCFLAGS += -fno-strict-aliasing
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DISTDIR ?= $(XEN_ROOT)/dist
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DESTDIR ?= /
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# Allow phony attribute to be listed as dependency rather than fake target
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.PHONY: .phony
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# If we are not cross-compiling, default HOSTC{C/XX} to C{C/XX}
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ifeq ($(XEN_TARGET_ARCH), $(XEN_COMPILE_ARCH))
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HOSTCC ?= $(CC)
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HOSTCXX ?= $(CXX)
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endif
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# Use Clang/LLVM instead of GCC?
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clang ?= n
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ifeq ($(clang),n)
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gcc := y
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HOSTCC ?= gcc
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HOSTCXX ?= g++
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else
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gcc := n
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HOSTCC ?= clang
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HOSTCXX ?= clang++
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endif
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DEPS_INCLUDE = $(addsuffix .d2, $(basename $(wildcard $(DEPS))))
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DEPS_RM = $(DEPS) $(DEPS_INCLUDE)
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%.d2: %.d
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sed "s!\(^\| \)$$PWD/! !" $^ >$@.tmp && mv -f $@.tmp $@
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include $(XEN_ROOT)/config/$(XEN_OS).mk
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include $(XEN_ROOT)/config/$(XEN_TARGET_ARCH).mk
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ifneq ($(EXTRA_PREFIX),)
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EXTRA_INCLUDES += $(EXTRA_PREFIX)/include
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EXTRA_LIB += $(EXTRA_PREFIX)/lib
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endif
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PYTHON ?= python
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PYTHON_PREFIX_ARG ?= --prefix="$(prefix)"
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# The above requires that prefix contains *no spaces*. This variable is here
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# to permit the user to set PYTHON_PREFIX_ARG to '' to workaround this bug:
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# https://bugs.launchpad.net/ubuntu/+bug/362570
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# cc-option: Check if compiler supports first option, else fall back to second.
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#
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# This is complicated by the fact that unrecognised -Wno-* options:
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# (a) are ignored unless the compilation emits a warning; and
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# (b) even then produce a warning rather than an error
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# To handle this we do a test compile, passing the option-under-test, on a code
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# fragment that will always produce a warning (integer assigned to pointer).
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# We then grep for the option-under-test in the compiler's output, the presence
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# of which would indicate an "unrecognized command-line option" warning/error.
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#
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# Usage: cflags-y += $(call cc-option,$(CC),-march=winchip-c6,-march=i586)
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cc-option = $(shell if test -z "`echo 'void*p=1;' | \
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$(1) $(2) -c -o /dev/null -x c - 2>&1 | grep -- $(2:-Wa$(comma)%=%) -`"; \
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then echo "$(2)"; else echo "$(3)"; fi ;)
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# cc-option-add: Add an option to compilation flags, but only if supported.
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# Usage: $(call cc-option-add CFLAGS,CC,-march=winchip-c6)
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cc-option-add = $(eval $(call cc-option-add-closure,$(1),$(2),$(3)))
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define cc-option-add-closure
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ifneq ($$(call cc-option,$$($(2)),$(3),n),n)
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$(1) += $(3)
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endif
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endef
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cc-options-add = $(foreach o,$(3),$(call cc-option-add,$(1),$(2),$(o)))
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# cc-ver: Check compiler against the version requirement. Return boolean 'y'/'n'.
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# Usage: ifeq ($(call cc-ver,$(CC),ge,0x030400),y)
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cc-ver = $(shell if [ $$((`$(1) -dumpversion | awk -F. \
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'{ printf "0x%02x%02x%02x", $$1, $$2, $$3}'`)) -$(2) $$(($(3))) ]; \
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then echo y; else echo n; fi ;)
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# cc-ver-check: Check compiler is at least specified version, else fail.
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# Usage: $(call cc-ver-check,CC,0x030400,"Require at least gcc-3.4")
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cc-ver-check = $(eval $(call cc-ver-check-closure,$(1),$(2),$(3)))
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define cc-ver-check-closure
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ifeq ($$(call cc-ver,$$($(1)),ge,$(2)),n)
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override $(1) = echo "*** FATAL BUILD ERROR: "$(3) >&2; exit 1;
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cc-option := n
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endif
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endef
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# Require GCC v4.1+
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check-$(gcc) = $(call cc-ver-check,CC,0x040100,"Xen requires at least gcc-4.1")
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$(eval $(check-y))
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ld-ver-build-id = $(shell $(1) --build-id 2>&1 | \
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grep -q build-id && echo n || echo y)
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export XEN_HAS_BUILD_ID ?= n
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ifeq ($(call ld-ver-build-id,$(LD)),n)
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build_id_linker :=
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else
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CFLAGS += -DBUILD_ID
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export XEN_HAS_BUILD_ID=y
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build_id_linker := --build-id=sha1
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endif
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define buildmakevars2shellvars
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export PREFIX="$(prefix)"; \
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export XEN_SCRIPT_DIR="$(XEN_SCRIPT_DIR)"; \
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export XEN_ROOT="$(XEN_ROOT)"
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endef
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#
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# Compare $(1) and $(2) and replace $(2) with $(1) if they differ
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#
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# Typically $(1) is a newly generated file and $(2) is the target file
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# being regenerated. This prevents changing the timestamp of $(2) only
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# due to being auto regenereated with the same contents.
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define move-if-changed
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if ! cmp -s $(1) $(2); then mv -f $(1) $(2); else rm -f $(1); fi
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endef
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BUILD_MAKE_VARS := sbindir bindir LIBEXEC LIBEXEC_BIN libdir SHAREDIR \
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XENFIRMWAREDIR XEN_CONFIG_DIR XEN_SCRIPT_DIR XEN_LOCK_DIR \
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XEN_RUN_DIR XEN_PAGING_DIR XEN_DUMP_DIR XEN_LOG_DIR \
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XEN_LIB_DIR XEN_RUN_STORED
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buildmakevars2file = $(eval $(call buildmakevars2file-closure,$(1)))
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define buildmakevars2file-closure
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$(1): .phony
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rm -f $(1).tmp; \
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$(foreach var, $(BUILD_MAKE_VARS), \
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echo "$(var)=\"$($(var))\"" >>$(1).tmp;) \
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$(call move-if-changed,$(1).tmp,$(1))
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endef
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CFLAGS += -fno-strict-aliasing
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CFLAGS += -std=gnu99
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CFLAGS += -Wall -Wstrict-prototypes
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$(call cc-option-add,CFLAGS,CC,-Wno-unused-but-set-variable)
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$(call cc-option-add,CFLAGS,CC,-Wno-unused-local-typedefs)
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LDFLAGS += $(foreach i, $(EXTRA_LIB), -L$(i))
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CFLAGS += $(foreach i, $(EXTRA_INCLUDES), -I$(i))
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LDFLAGS += $(foreach i, $(PREPEND_LIB), -L$(i))
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CFLAGS += $(foreach i, $(PREPEND_INCLUDES), -I$(i))
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ifeq ($(XEN_TOOLS_RPATH),y)
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LDFLAGS += -Wl,-rpath,$(libdir)
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endif
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APPEND_LDFLAGS += $(foreach i, $(APPEND_LIB), -L$(i))
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APPEND_CFLAGS += $(foreach i, $(APPEND_INCLUDES), -I$(i))
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EMBEDDED_EXTRA_CFLAGS := -fno-pie -fno-stack-protector -fno-stack-protector-all
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EMBEDDED_EXTRA_CFLAGS += -fno-exceptions -fno-asynchronous-unwind-tables
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XEN_EXTFILES_URL ?= http://xenbits.xen.org/xen-extfiles
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# All the files at that location were downloaded from elsewhere on
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# the internet. The original download URL is preserved as a comment
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# near the place in the Xen Makefiles where the file is used.
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# Where to look for inlined subtrees (for example, from a tarball)
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QEMU_UPSTREAM_INTREE ?= $(XEN_ROOT)/tools/qemu-xen
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QEMU_TRADITIONAL_INTREE ?= $(XEN_ROOT)/tools/qemu-xen-traditional
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# Handle legacy options
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ifneq (,$(SEABIOS_UPSTREAM_TAG))
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SEABIOS_UPSTREAM_REVISION ?= $(SEABIOS_UPSTREAM_TAG)
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endif
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ifneq (,$(QEMU_REMOTE))
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QEMU_TRADITIONAL_URL ?= $(QEMU_REMOTE)
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endif
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ifneq (,$(CONFIG_QEMU))
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QEMU_TRADITIONAL_LOC ?= $(CONFIG_QEMU)
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endif
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ifneq (,$(QEMU_TAG))
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QEMU_TRADITIONAL_REVISION ?= $(QEMU_TAG)
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endif
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ifeq ($(GIT_HTTP),y)
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OVMF_UPSTREAM_URL ?= http://xenbits.xen.org/git-http/ovmf.git
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QEMU_UPSTREAM_URL ?= http://xenbits.xen.org/git-http/qemu-xen.git
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QEMU_TRADITIONAL_URL ?= http://xenbits.xen.org/git-http/qemu-xen-traditional.git
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SEABIOS_UPSTREAM_URL ?= http://xenbits.xen.org/git-http/seabios.git
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MINIOS_UPSTREAM_URL ?= http://xenbits.xen.org/git-http/mini-os.git
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else
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OVMF_UPSTREAM_URL ?= git://xenbits.xen.org/ovmf.git
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QEMU_UPSTREAM_URL ?= git://xenbits.xen.org/qemu-xen.git
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QEMU_TRADITIONAL_URL ?= git://xenbits.xen.org/qemu-xen-traditional.git
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SEABIOS_UPSTREAM_URL ?= git://xenbits.xen.org/seabios.git
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MINIOS_UPSTREAM_URL ?= git://xenbits.xen.org/mini-os.git
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endif
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OVMF_UPSTREAM_REVISION ?= 7b4a99be8a39c12d3a7fc4b8db9f0eab4ac688d5
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QEMU_UPSTREAM_REVISION ?= qemu-xen-4.17.2
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MINIOS_UPSTREAM_REVISION ?= xen-RELEASE-4.17.1
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SEABIOS_UPSTREAM_REVISION ?= rel-1.16.0
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ETHERBOOT_NICS ?= rtl8139 8086100e
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QEMU_TRADITIONAL_REVISION ?= xen-4.17.1
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# Specify which qemu-dm to use. This may be `ioemu' to use the old
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# Mercurial in-tree version, or a local directory, or a git URL.
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# QEMU_UPSTREAM_LOC ?= `pwd`/$(XEN_ROOT)/../qemu-xen.git
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# Defaults for subtree locations
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QEMU_TRADITIONAL_LOC ?= $(call or,$(wildcard $(QEMU_TRADITIONAL_INTREE)),\
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$(QEMU_TRADITIONAL_URL))
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QEMU_UPSTREAM_LOC ?= $(call or,$(wildcard $(QEMU_UPSTREAM_INTREE)),\
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$(QEMU_UPSTREAM_URL))
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CONFIG_TESTS ?= y
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