f382bac49b
By using -nobuiltininc and adding the clang builtin headers resource dir to the end of the compiler header search path, we can still find headers such as immintrin.h but find the FreeBSD version of stddef.h/stdarg.h/.. first. This is a workaround until we are able to settle on and complete a plan to harmonize guard macros with LLVM. We've mostly worked out this on FreeBSD systems by removing select headers from the installed set of devel/llvm*, but that isn't a good solution for cross build. Submitted by: arichardson Obtained from: CheriBSD Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D17002
250 lines
9.1 KiB
Makefile
250 lines
9.1 KiB
Makefile
# $FreeBSD$
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# Setup variables for the compiler
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#
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# COMPILER_TYPE is the major type of compiler. Currently gcc and clang support
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# automatic detection. Other compiler types can be shoe-horned in, but require
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# explicit setting of the compiler type. The compiler type can also be set
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# explicitly if, say, you install gcc as clang...
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#
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# COMPILER_VERSION is a numeric constant equal to:
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# major * 10000 + minor * 100 + tiny
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# It too can be overridden on the command line. When testing it, be sure to
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# make sure that you are limiting the test to a specific compiler. Testing
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# against 30300 for gcc likely isn't what you wanted (since versions of gcc
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# prior to 4.2 likely have no prayer of working).
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#
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# COMPILER_FREEBSD_VERSION is the compiler's __FreeBSD_cc_version value.
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#
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# COMPILER_FEATURES will contain one or more of the following, based on
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# compiler support for that feature:
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#
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# - c++17: supports full (or nearly full) C++17 programming environment.
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# - c++14: supports full (or nearly full) C++14 programming environment.
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# - c++11: supports full (or nearly full) C++11 programming environment.
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# - retpoline: supports the retpoline speculative execution vulnerability
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# mitigation.
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#
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# These variables with an X_ prefix will also be provided if XCC is set.
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#
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# This file may be included multiple times, but only has effect the first time.
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#
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.if !target(__<bsd.compiler.mk>__)
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__<bsd.compiler.mk>__:
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.include <bsd.opts.mk>
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.if defined(_NO_INCLUDE_COMPILERMK)
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# If _NO_INCLUDE_COMPILERMK is set we are doing a make obj/cleandir/cleanobj
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# and might not have a valid compiler in $PATH yet. In this case just set the
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# variables that are expected by the other .mk files and return
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COMPILER_TYPE=none
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X_COMPILER_TYPE=none
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COMPILER_VERSION=0
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X_COMPILER_VERSION=0
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COMPILER_FEATURES=none
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.else
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# command = /usr/local/bin/ccache cc ...
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# wrapper = /usr/local/libexec/ccache/cc ...
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CCACHE_BUILD_TYPE?= command
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# Handle ccache after CC is determined, but not if CC/CXX are already
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# overridden with a manual setup.
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.if ${MK_CCACHE_BUILD:Uno} == "yes" && \
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!make(test-system-*) && !make(print-dir) && !make(showconfig) && \
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(${CC:M*ccache/world/*} == "" || ${CXX:M*ccache/world/*} == "")
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# CC is always prepended with the ccache wrapper rather than modifying
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# PATH since it is more clear that ccache is used and avoids wasting time
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# for mkdep/linking/asm builds.
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LOCALBASE?= /usr/local
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CCACHE_WRAPPER_PATH?= ${LOCALBASE}/libexec/ccache
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CCACHE_BIN?= ${LOCALBASE}/bin/ccache
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.if exists(${CCACHE_BIN})
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# Export to ensure sub-makes can filter it out for mkdep/linking and
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# to chain down into kernel build which won't include this file.
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.export CCACHE_BIN
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# Expand and export some variables so they may be based on make vars.
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# This allows doing something like the following in the environment:
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# CCACHE_BASEDIR='${SRCTOP:H}' MAKEOBJDIRPREFIX='${SRCTOP:H}/obj'
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.for var in CCACHE_LOGFILE CCACHE_BASEDIR
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.if defined(${var})
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${var}:= ${${var}}
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.export ${var}
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.endif
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.endfor
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# Handle bootstrapped compiler changes properly by hashing their content
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# rather than checking mtime. For external compilers it should be safe
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# to use the more optimal mtime check.
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# XXX: CCACHE_COMPILERCHECK= string:<compiler_version, compiler_build_rev, compiler_patch_rev, compiler_default_target, compiler_default_sysroot>
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.if ${CC:N${CCACHE_BIN}:[1]:M/*} == ""
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CCACHE_COMPILERCHECK?= content
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.else
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CCACHE_COMPILERCHECK?= mtime
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.endif
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.export CCACHE_COMPILERCHECK
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# Ensure no bogus CCACHE_PATH leaks in which might avoid the in-tree compiler.
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.if !empty(CCACHE_PATH)
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CCACHE_PATH=
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.export CCACHE_PATH
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.endif
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.if ${CCACHE_BUILD_TYPE} == "command"
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# Remove ccache from the PATH to prevent double calls and wasted CPP/LD time.
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PATH:= ${PATH:C,:?${CCACHE_WRAPPER_PATH}(/world)?(:$)?,,g}
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# Override various toolchain vars.
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.for var in CC CXX HOST_CC HOST_CXX
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.if defined(${var}) && ${${var}:M${CCACHE_BIN}} == ""
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${var}:= ${CCACHE_BIN} ${${var}}
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.endif
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.endfor
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.else
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# Need to ensure CCACHE_WRAPPER_PATH is the first in ${PATH}
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PATH:= ${PATH:C,:?${CCACHE_WRAPPER_PATH}(/world)?(:$)?,,g}
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PATH:= ${CCACHE_WRAPPER_PATH}:${PATH}
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CCACHE_WRAPPER_PATH_PFX= ${CCACHE_WRAPPER_PATH}:
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.endif # ${CCACHE_BUILD_TYPE} == "command"
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# GCC does not need the CCACHE_CPP2 hack enabled by default in devel/ccache.
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# The port enables it due to ccache passing preprocessed C to clang
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# which fails with -Wparentheses-equality, -Wtautological-compare, and
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# -Wself-assign on macro-expanded lines.
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.if defined(COMPILER_TYPE) && ${COMPILER_TYPE} == "gcc"
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CCACHE_NOCPP2= 1
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.export CCACHE_NOCPP2
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.endif
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# Canonicalize CCACHE_DIR for meta mode usage.
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.if !defined(CCACHE_DIR)
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CCACHE_DIR!= ${CCACHE_BIN} -p | awk '$$2 == "cache_dir" {print $$4}'
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.export CCACHE_DIR
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.endif
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.if !empty(CCACHE_DIR) && empty(.MAKE.META.IGNORE_PATHS:M${CCACHE_DIR})
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CCACHE_DIR:= ${CCACHE_DIR:tA}
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.MAKE.META.IGNORE_PATHS+= ${CCACHE_DIR}
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.export CCACHE_DIR
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.endif
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# ccache doesn't affect build output so let it slide for meta mode
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# comparisons.
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.MAKE.META.IGNORE_PATHS+= ${CCACHE_BIN}
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ccache-print-options: .PHONY
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@${CCACHE_BIN} -p
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.endif # exists(${CCACHE_BIN})
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.endif # ${MK_CCACHE_BUILD} == "yes"
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_cc_vars=CC $${_empty_var_}
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.if !empty(_WANT_TOOLCHAIN_CROSS_VARS)
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# Only the toplevel makefile needs to compute the X_COMPILER_* variables.
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# Skipping the computation of the unused X_COMPILER_* in the subdirectory
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# makefiles can save a noticeable amount of time when walking the whole source
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# tree (e.g. during make includes, etc.).
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_cc_vars+=XCC X_
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.endif
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.for cc X_ in ${_cc_vars}
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.if ${cc} == "CC" || !empty(XCC)
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# Try to import COMPILER_TYPE and COMPILER_VERSION from parent make.
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# The value is only used/exported for the same environment that impacts
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# CC and COMPILER_* settings here.
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_exported_vars= ${X_}COMPILER_TYPE ${X_}COMPILER_VERSION \
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${X_}COMPILER_FREEBSD_VERSION ${X_}COMPILER_RESOURCE_DIR
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${X_}_cc_hash= ${${cc}}${MACHINE}${PATH}
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${X_}_cc_hash:= ${${X_}_cc_hash:hash}
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# Only import if none of the vars are set somehow else.
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_can_export= yes
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.for var in ${_exported_vars}
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.if defined(${var})
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_can_export= no
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.endif
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.endfor
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.if ${_can_export} == yes
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.for var in ${_exported_vars}
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.if defined(${var}__${${X_}_cc_hash})
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${var}= ${${var}__${${X_}_cc_hash}}
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.endif
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.endfor
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.endif
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.if ${cc} == "CC" || (${cc} == "XCC" && ${XCC} != ${CC})
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.if ${MACHINE} == "common"
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# common is a pseudo machine for architecture independent
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# generated files - thus there is no compiler.
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${X_}COMPILER_TYPE= none
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${X_}COMPILER_VERSION= 0
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${X_}COMPILER_FREEBSD_VERSION= 0
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.elif !defined(${X_}COMPILER_TYPE) || !defined(${X_}COMPILER_VERSION)
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_v!= ${${cc}:N${CCACHE_BIN}} --version || echo 0.0.0
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.if !defined(${X_}COMPILER_TYPE)
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. if ${${cc}:T:M*gcc*}
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${X_}COMPILER_TYPE:= gcc
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. elif ${${cc}:T:M*clang*}
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${X_}COMPILER_TYPE:= clang
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. elif ${_v:Mgcc}
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${X_}COMPILER_TYPE:= gcc
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. elif ${_v:M\(GCC\)} || ${_v:M*GNU}
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${X_}COMPILER_TYPE:= gcc
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. elif ${_v:Mclang} || ${_v:M(clang-*.*.*)}
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${X_}COMPILER_TYPE:= clang
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. else
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.error Unable to determine compiler type for ${cc}=${${cc}}. Consider setting ${X_}COMPILER_TYPE.
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. endif
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.endif
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.if !defined(${X_}COMPILER_VERSION)
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${X_}COMPILER_VERSION!=echo "${_v:M[1-9]*.[0-9]*}" | awk -F. '{print $$1 * 10000 + $$2 * 100 + $$3;}'
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.endif
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.undef _v
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.endif
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.if !defined(${X_}COMPILER_FREEBSD_VERSION)
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${X_}COMPILER_FREEBSD_VERSION!= { echo "__FreeBSD_cc_version" | ${${cc}:N${CCACHE_BIN}} -E - 2>/dev/null || echo __FreeBSD_cc_version; } | sed -n '$$p'
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# If we get a literal "__FreeBSD_cc_version" back then the compiler
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# is a non-FreeBSD build that doesn't support it or some other error
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# occurred.
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.if ${${X_}COMPILER_FREEBSD_VERSION} == "__FreeBSD_cc_version"
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${X_}COMPILER_FREEBSD_VERSION= unknown
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.endif
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.endif
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.if !defined(${X_}COMPILER_RESOURCE_DIR)
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${X_}COMPILER_RESOURCE_DIR!= ${${cc}:N${CCACHE_BIN}} -print-resource-dir 2>/dev/null || echo unknown
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.endif
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${X_}COMPILER_FEATURES=
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.if (${${X_}COMPILER_TYPE} == "clang" && ${${X_}COMPILER_VERSION} >= 30300) || \
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(${${X_}COMPILER_TYPE} == "gcc" && ${${X_}COMPILER_VERSION} >= 40800)
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${X_}COMPILER_FEATURES+= c++11
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.endif
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.if (${${X_}COMPILER_TYPE} == "clang" && ${${X_}COMPILER_VERSION} >= 30400) || \
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(${${X_}COMPILER_TYPE} == "gcc" && ${${X_}COMPILER_VERSION} >= 50000)
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${X_}COMPILER_FEATURES+= c++14
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.endif
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.if (${${X_}COMPILER_TYPE} == "clang" && ${${X_}COMPILER_VERSION} >= 50000) || \
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(${${X_}COMPILER_TYPE} == "gcc" && ${${X_}COMPILER_VERSION} >= 70000)
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${X_}COMPILER_FEATURES+= c++17
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.endif
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.if ${${X_}COMPILER_TYPE} == "clang" && ${${X_}COMPILER_VERSION} >= 60000
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${X_}COMPILER_FEATURES+= retpoline
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.endif
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.else
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# Use CC's values
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X_COMPILER_TYPE= ${COMPILER_TYPE}
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X_COMPILER_VERSION= ${COMPILER_VERSION}
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X_COMPILER_FREEBSD_VERSION= ${COMPILER_FREEBSD_VERSION}
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X_COMPILER_FEATURES= ${COMPILER_FEATURES}
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X_COMPILER_RESOURCE_DIR= ${COMPILER_RESOURCE_DIR}
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.endif # ${cc} == "CC" || (${cc} == "XCC" && ${XCC} != ${CC})
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# Export the values so sub-makes don't have to look them up again, using the
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# hash key computed above.
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.for var in ${_exported_vars}
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${var}__${${X_}_cc_hash}:= ${${var}}
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.export-env ${var}__${${X_}_cc_hash}
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.undef ${var}__${${X_}_cc_hash}
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.endfor
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.endif # ${cc} == "CC" || !empty(XCC)
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.endfor # .for cc in CC XCC
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.if !defined(_NO_INCLUDE_LINKERMK)
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.include <bsd.linker.mk>
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.endif
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.endif # defined(_NO_INCLUDE_COMPILERMK)
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.endif # !target(__<bsd.compiler.mk>__)
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