xref: /freebsd/share/mk/bsd.compiler.mk (revision f374ba41f55c1a127303d92d830dd58eef2f5243)
1# $FreeBSD$
2
3# Setup variables for the compiler
4#
5# COMPILER_TYPE is the major type of compiler. Currently gcc and clang support
6# automatic detection. Other compiler types can be shoe-horned in, but require
7# explicit setting of the compiler type. The compiler type can also be set
8# explicitly if, say, you install gcc as clang...
9#
10# COMPILER_VERSION is a numeric constant equal to:
11#     major * 10000 + minor * 100 + tiny
12# It too can be overridden on the command line. When testing it, be sure to
13# make sure that you are limiting the test to a specific compiler. Testing
14# against 30300 for gcc likely isn't  what you wanted (since versions of gcc
15# prior to 4.2 likely have no prayer of working).
16#
17# COMPILER_FREEBSD_VERSION is the compiler's __FreeBSD_cc_version value.
18#
19# COMPILER_FEATURES will contain one or more of the following, based on
20# compiler support for that feature:
21#
22# - c++17:     supports full (or nearly full) C++17 programming environment.
23# - c++14:     supports full (or nearly full) C++14 programming environment.
24# - c++11:     supports full (or nearly full) C++11 programming environment.
25# - retpoline: supports the retpoline speculative execution vulnerability
26#              mitigation.
27# - init-all:  supports stack variable initialization.
28# - aarch64-sha512: supports the AArch64 sha512 intrinsic functions.
29#
30# When bootstrapping on macOS, 'apple-clang' will be set in COMPILER_FEATURES
31# to differentiate Apple's version of Clang. Apple Clang uses a different
32# versioning scheme and may not support the same -W/-Wno warning flags. For a
33# mapping of Apple Clang versions to upstream clang versions see
34# https://en.wikipedia.org/wiki/Xcode#Xcode_7.0_-_12.x_(since_Free_On-Device_Development)
35#
36# These variables with an X_ prefix will also be provided if XCC is set.
37#
38# This file may be included multiple times, but only has effect the first time.
39#
40
41.if !target(__<bsd.compiler.mk>__)
42__<bsd.compiler.mk>__:
43
44.include <bsd.opts.mk>
45
46.if defined(_NO_INCLUDE_COMPILERMK)
47# If _NO_INCLUDE_COMPILERMK is set we are doing a make obj/cleandir/cleanobj
48# and might not have a valid compiler in $PATH yet. In this case just set the
49# variables that are expected by the other .mk files and return
50COMPILER_TYPE=none
51X_COMPILER_TYPE=none
52COMPILER_VERSION=0
53X_COMPILER_VERSION=0
54COMPILER_FEATURES=none
55.else
56# command = /usr/local/bin/ccache cc ...
57# wrapper = /usr/local/libexec/ccache/cc ...
58CCACHE_BUILD_TYPE?=	command
59# Handle ccache after CC is determined, but not if CC/CXX are already
60# overridden with a manual setup.
61.if ${MK_CCACHE_BUILD:Uno} == "yes" && \
62    !make(test-system-*) && !make(print-dir) && !make(showconfig) && \
63    (${CC:M*ccache/world/*} == "" || ${CXX:M*ccache/world/*} == "")
64# CC is always prepended with the ccache wrapper rather than modifying
65# PATH since it is more clear that ccache is used and avoids wasting time
66# for mkdep/linking/asm builds.
67LOCALBASE?=		/usr/local
68CCACHE_PKG_PREFIX?=	${LOCALBASE}
69CCACHE_WRAPPER_PATH?=	${CCACHE_PKG_PREFIX}/libexec/ccache
70CCACHE_BIN?=		${CCACHE_PKG_PREFIX}/bin/ccache
71.if exists(${CCACHE_BIN})
72# Export to ensure sub-makes can filter it out for mkdep/linking and
73# to chain down into kernel build which won't include this file.
74.export CCACHE_BIN
75# Expand and export some variables so they may be based on make vars.
76# This allows doing something like the following in the environment:
77# CCACHE_BASEDIR='${SRCTOP:H}' MAKEOBJDIRPREFIX='${SRCTOP:H}/obj'
78.for var in CCACHE_LOGFILE CCACHE_BASEDIR
79.if defined(${var})
80${var}:=	${${var}}
81.export		${var}
82.endif
83.endfor
84# Handle bootstrapped compiler changes properly by hashing their content
85# rather than checking mtime.  For external compilers it should be safe
86# to use the more optimal mtime check.
87# XXX: CCACHE_COMPILERCHECK= string:<compiler_version, compiler_build_rev, compiler_patch_rev, compiler_default_target, compiler_default_sysroot>
88.if ${CC:N${CCACHE_BIN}:[1]:M/*} == ""
89CCACHE_COMPILERCHECK?=	content
90.else
91CCACHE_COMPILERCHECK?=	mtime
92.endif
93.export CCACHE_COMPILERCHECK
94# Ensure no bogus CCACHE_PATH leaks in which might avoid the in-tree compiler.
95.if !empty(CCACHE_PATH)
96CCACHE_PATH=
97.export CCACHE_PATH
98.endif
99.if ${CCACHE_BUILD_TYPE} == "command"
100# Remove ccache from the PATH to prevent double calls and wasted CPP/LD time.
101PATH:=	${PATH:C,:?${CCACHE_WRAPPER_PATH}(/world)?(:$)?,,g}
102# Override various toolchain vars.
103.for var in CC CXX HOST_CC HOST_CXX
104.if defined(${var}) && ${${var}:M${CCACHE_BIN}} == ""
105${var}:=	${CCACHE_BIN} ${${var}}
106.endif
107.endfor
108.else
109# Need to ensure CCACHE_WRAPPER_PATH is the first in ${PATH}
110PATH:=	${PATH:C,:?${CCACHE_WRAPPER_PATH}(/world)?(:$)?,,g}
111PATH:=	${CCACHE_WRAPPER_PATH}:${PATH}
112CCACHE_WRAPPER_PATH_PFX=	${CCACHE_WRAPPER_PATH}:
113.endif	# ${CCACHE_BUILD_TYPE} == "command"
114# GCC does not need the CCACHE_CPP2 hack enabled by default in devel/ccache.
115# The port enables it due to ccache passing preprocessed C to clang
116# which fails with -Wparentheses-equality, -Wtautological-compare, and
117# -Wself-assign on macro-expanded lines.
118.if defined(COMPILER_TYPE) && ${COMPILER_TYPE} == "gcc"
119CCACHE_NOCPP2=	1
120.export CCACHE_NOCPP2
121.endif
122# Canonicalize CCACHE_DIR for meta mode usage.
123.if !defined(CCACHE_DIR)
124CCACHE_DIR!=	${CCACHE_BIN} -p | awk '$$2 == "cache_dir" {print $$4}'
125.export CCACHE_DIR
126.endif
127.if !empty(CCACHE_DIR) && empty(.MAKE.META.IGNORE_PATHS:M${CCACHE_DIR})
128CCACHE_DIR:=	${CCACHE_DIR:tA}
129.MAKE.META.IGNORE_PATHS+= ${CCACHE_DIR}
130.export CCACHE_DIR
131.endif
132# ccache doesn't affect build output so let it slide for meta mode
133# comparisons.
134.MAKE.META.IGNORE_PATHS+= ${CCACHE_BIN}
135ccache-print-options: .PHONY
136	@${CCACHE_BIN} -p
137.endif	# exists(${CCACHE_BIN})
138.endif	# ${MK_CCACHE_BUILD} == "yes"
139
140_cc_vars=CC $${_empty_var_}
141.if !empty(_WANT_TOOLCHAIN_CROSS_VARS)
142# Only the toplevel makefile needs to compute the X_COMPILER_* variables.
143# Skipping the computation of the unused X_COMPILER_* in the subdirectory
144# makefiles can save a noticeable amount of time when walking the whole source
145# tree (e.g. during make includes, etc.).
146_cc_vars+=XCC X_
147.endif
148
149.for cc X_ in ${_cc_vars}
150.if ${cc} == "CC" || !empty(XCC)
151# Try to import COMPILER_TYPE and COMPILER_VERSION from parent make.
152# The value is only used/exported for the same environment that impacts
153# CC and COMPILER_* settings here.
154_exported_vars=	${X_}COMPILER_TYPE ${X_}COMPILER_VERSION \
155		${X_}COMPILER_FREEBSD_VERSION ${X_}COMPILER_RESOURCE_DIR
156${X_}_cc_hash=	${${cc}}${MACHINE}${PATH}
157${X_}_cc_hash:=	${${X_}_cc_hash:hash}
158# Only import if none of the vars are set differently somehow else.
159_can_export=	yes
160.for var in ${_exported_vars}
161.if defined(${var}) && (!defined(${var}__${${X_}_cc_hash}) || ${${var}__${${X_}_cc_hash}} != ${${var}})
162.if defined(${var}__${${X_}_ld_hash})
163.info Cannot import ${X_}COMPILER variables since cached ${var} is different: ${${var}__${${X_}_cc_hash}} != ${${var}}
164.endif
165_can_export=	no
166.endif
167.endfor
168.if ${_can_export} == yes
169.for var in ${_exported_vars}
170.if defined(${var}__${${X_}_cc_hash})
171${var}=	${${var}__${${X_}_cc_hash}}
172.endif
173.endfor
174.endif
175
176.if ${cc} == "CC" || (${cc} == "XCC" && ${XCC} != ${CC})
177.if ${MACHINE} == "common"
178# common is a pseudo machine for architecture independent
179# generated files - thus there is no compiler.
180${X_}COMPILER_TYPE= none
181${X_}COMPILER_VERSION= 0
182${X_}COMPILER_FREEBSD_VERSION= 0
183.elif !defined(${X_}COMPILER_TYPE) || !defined(${X_}COMPILER_VERSION)
184_v!=	${${cc}:N${CCACHE_BIN}} --version || echo 0.0.0
185
186.if !defined(${X_}COMPILER_TYPE)
187. if ${${cc}:T:M*gcc*}
188${X_}COMPILER_TYPE:=	gcc
189. elif ${${cc}:T:M*clang*}
190${X_}COMPILER_TYPE:=	clang
191. elif ${_v:Mgcc}
192${X_}COMPILER_TYPE:=	gcc
193. elif ${_v:M\(GCC\)} || ${_v:M*GNU}
194${X_}COMPILER_TYPE:=	gcc
195. elif ${_v:Mclang} || ${_v:M(clang-*.*.*)}
196${X_}COMPILER_TYPE:=	clang
197. else
198# With GCC, cc --version prints "cc $VERSION ($PKGVERSION)", so if a
199# distribution overrides the default GCC PKGVERSION it is not identified.
200# However, its -v output always says "gcc version" in it, so fall back on that.
201_gcc_version!=	${${cc}:N${CCACHE_BIN}} -v 2>&1 | grep "gcc version"
202.  if !empty(_gcc_version)
203${X_}COMPILER_TYPE:=	gcc
204.  else
205.error Unable to determine compiler type for ${cc}=${${cc}}.  Consider setting ${X_}COMPILER_TYPE.
206.  endif
207.undef _gcc_version
208. endif
209.endif
210.if !defined(${X_}COMPILER_VERSION)
211${X_}COMPILER_VERSION!=echo "${_v:M[1-9]*.[0-9]*}" | awk -F. '{print $$1 * 10000 + $$2 * 100 + $$3;}'
212.endif
213# Detect apple clang when bootstrapping to select appropriate warning flags.
214.if !defined(${X_}COMPILER_FEATURES) && ${_v:[*]:M*Apple clang version*}
215${X_}COMPILER_FEATURES=	apple-clang
216.endif
217.undef _v
218.endif
219.if !defined(${X_}COMPILER_FREEBSD_VERSION)
220${X_}COMPILER_FREEBSD_VERSION!=	{ echo "__FreeBSD_cc_version" | ${${cc}:N${CCACHE_BIN}} -E - 2>/dev/null || echo __FreeBSD_cc_version; } | sed -n '$$p'
221# If we get a literal "__FreeBSD_cc_version" back then the compiler
222# is a non-FreeBSD build that doesn't support it or some other error
223# occurred.
224.if ${${X_}COMPILER_FREEBSD_VERSION} == "__FreeBSD_cc_version"
225${X_}COMPILER_FREEBSD_VERSION=	unknown
226.endif
227.endif
228
229.if !defined(${X_}COMPILER_RESOURCE_DIR)
230${X_}COMPILER_RESOURCE_DIR!=	${${cc}:N${CCACHE_BIN}} -print-resource-dir 2>/dev/null || echo unknown
231.endif
232
233${X_}COMPILER_FEATURES+=		c++11 c++14
234.if ${${X_}COMPILER_TYPE} == "clang" || \
235	(${${X_}COMPILER_TYPE} == "gcc" && ${${X_}COMPILER_VERSION} >= 70000)
236${X_}COMPILER_FEATURES+=	c++17
237.endif
238.if (${${X_}COMPILER_TYPE} == "clang" && ${${X_}COMPILER_VERSION} >= 100000) || \
239	(${${X_}COMPILER_TYPE} == "gcc" && ${${X_}COMPILER_VERSION} >= 100100)
240${X_}COMPILER_FEATURES+=	c++20
241.endif
242.if ${${X_}COMPILER_TYPE} == "clang"
243${X_}COMPILER_FEATURES+=	retpoline init-all
244# PR257638 lld fails with BE compressed debug.  Fixed in main but external tool
245# chains will initially not have the fix.  For now limit the feature to LE
246# targets.
247# When compiling bootstrap tools on non-FreeBSD, the various MACHINE variables
248# for the host can be missing or not match FreeBSD's naming (e.g. Linux/amd64
249# reports as MACHINE=x86_64 MACHINE_ARCH=x86_64), causing TARGET_ENDIANNESS to
250# be undefined; be conservative and default to off until we turn this on by
251# default everywhere.
252.include <bsd.endian.mk>
253.if (${.MAKE.OS} == "FreeBSD" || defined(TARGET_ENDIANNESS)) && \
254    ${TARGET_ENDIANNESS} == "1234"
255${X_}COMPILER_FEATURES+=	compressed-debug
256.endif
257.endif
258.if ${${X_}COMPILER_TYPE} == "clang" && ${${X_}COMPILER_VERSION} >= 100000 || \
259	(${${X_}COMPILER_TYPE} == "gcc" && ${${X_}COMPILER_VERSION} >= 80100)
260${X_}COMPILER_FEATURES+=	fileprefixmap
261.endif
262
263.if (${${X_}COMPILER_TYPE} == "clang" && ${${X_}COMPILER_VERSION} >= 130000) || \
264	(${${X_}COMPILER_TYPE} == "gcc" && ${${X_}COMPILER_VERSION} >= 90000)
265# AArch64 sha512 intrinsics are supported (and have been tested) in
266# clang 13 and gcc 9.
267${X_}COMPILER_FEATURES+=	aarch64-sha512
268.endif
269
270.else
271# Use CC's values
272X_COMPILER_TYPE=	${COMPILER_TYPE}
273X_COMPILER_VERSION=	${COMPILER_VERSION}
274X_COMPILER_FREEBSD_VERSION=	${COMPILER_FREEBSD_VERSION}
275X_COMPILER_FEATURES=	${COMPILER_FEATURES}
276X_COMPILER_RESOURCE_DIR=	${COMPILER_RESOURCE_DIR}
277.endif	# ${cc} == "CC" || (${cc} == "XCC" && ${XCC} != ${CC})
278
279# Export the values so sub-makes don't have to look them up again, using the
280# hash key computed above.
281.for var in ${_exported_vars}
282${var}__${${X_}_cc_hash}:=	${${var}}
283.export-env ${var}__${${X_}_cc_hash}
284.undef ${var}__${${X_}_cc_hash}
285.endfor
286
287.endif	# ${cc} == "CC" || !empty(XCC)
288.endfor	# .for cc in CC XCC
289
290.if !defined(_NO_INCLUDE_LINKERMK)
291.include <bsd.linker.mk>
292.endif
293.endif	# defined(_NO_INCLUDE_COMPILERMK)
294.endif	# !target(__<bsd.compiler.mk>__)
295