1# $FreeBSD: stable/11/share/mk/bsd.compiler.mk 352638 2019-09-24 02:30:32Z mhorne $
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++11:     supports full (or nearly full) C++11 programming environment.
23# - retpoline: supports the retpoline speculative execution vulnerability
24#              mitigation.
25#
26# These variables with an X_ prefix will also be provided if XCC is set.
27#
28# This file may be included multiple times, but only has effect the first time.
29#
30
31.if !target(__<bsd.compiler.mk>__)
32__<bsd.compiler.mk>__:
33
34.include <bsd.opts.mk>
35
36# Handle ccache after CC is determined, but not if CC/CXX are already
37# overridden with a manual setup.
38.if ${MK_CCACHE_BUILD:Uno} == "yes" && \
39    !make(showconfig) && \
40    (${CC:M*ccache/world/*} == "" || ${CXX:M*ccache/world/*} == "")
41# CC is always prepended with the ccache wrapper rather than modifying
42# PATH since it is more clear that ccache is used and avoids wasting time
43# for mkdep/linking/asm builds.
44LOCALBASE?=		/usr/local
45CCACHE_WRAPPER_PATH?=	${LOCALBASE}/libexec/ccache
46CCACHE_BIN?=		${LOCALBASE}/bin/ccache
47.if exists(${CCACHE_BIN})
48# Export to ensure sub-makes can filter it out for mkdep/linking and
49# to chain down into kernel build which won't include this file.
50.export CCACHE_BIN
51# Expand and export some variables so they may be based on make vars.
52# This allows doing something like the following in the environment:
53# CCACHE_BASEDIR='${SRCTOP:H}' MAKEOBJDIRPREFIX='${SRCTOP:H}/obj'
54.for var in CCACHE_LOGFILE CCACHE_BASEDIR
55.if defined(${var})
56${var}:=	${${var}}
57.export		${var}
58.endif
59.endfor
60# Handle bootstrapped compiler changes properly by hashing their content
61# rather than checking mtime.  For external compilers it should be safe
62# to use the more optimal mtime check.
63# XXX: CCACHE_COMPILERCHECK= string:<compiler_version, compiler_build_rev, compiler_patch_rev, compiler_default_target, compiler_default_sysroot>
64.if ${CC:N${CCACHE_BIN}:[1]:M/*} == ""
65CCACHE_COMPILERCHECK?=	content
66.else
67CCACHE_COMPILERCHECK?=	mtime
68.endif
69.export CCACHE_COMPILERCHECK
70# Remove ccache from the PATH to prevent double calls and wasted CPP/LD time.
71PATH:=	${PATH:C,:?${CCACHE_WRAPPER_PATH}(/world)?(:$)?,,g}
72# Ensure no bogus CCACHE_PATH leaks in which might avoid the in-tree compiler.
73.if !empty(CCACHE_PATH)
74CCACHE_PATH=
75.export CCACHE_PATH
76.endif
77# Override various toolchain vars.
78.for var in CC CXX HOST_CC HOST_CXX
79.if defined(${var}) && ${${var}:M${CCACHE_BIN}} == ""
80${var}:=	${CCACHE_BIN} ${${var}}
81.endif
82.endfor
83# GCC does not need the CCACHE_CPP2 hack enabled by default in devel/ccache.
84# The port enables it due to ccache passing preprocessed C to clang
85# which fails with -Wparentheses-equality, -Wtautological-compare, and
86# -Wself-assign on macro-expanded lines.
87.if defined(COMPILER_TYPE) && ${COMPILER_TYPE} == "gcc"
88CCACHE_NOCPP2=	1
89.export CCACHE_NOCPP2
90.endif
91# Canonicalize CCACHE_DIR for meta mode usage.
92.if !defined(CCACHE_DIR)
93CCACHE_DIR!=	${CCACHE_BIN} -p | awk '$$2 == "cache_dir" {print $$4}'
94.export CCACHE_DIR
95.endif
96.if !empty(CCACHE_DIR) && empty(.MAKE.META.IGNORE_PATHS:M${CCACHE_DIR})
97CCACHE_DIR:=	${CCACHE_DIR:tA}
98.MAKE.META.IGNORE_PATHS+= ${CCACHE_DIR}
99.export CCACHE_DIR
100.endif
101# ccache doesn't affect build output so let it slide for meta mode
102# comparisons.
103.MAKE.META.IGNORE_PATHS+= ${CCACHE_BIN}
104ccache-print-options: .PHONY
105	@${CCACHE_BIN} -p
106.endif	# exists(${CCACHE_BIN})
107.endif	# ${MK_CCACHE_BUILD} == "yes"
108
109.for cc X_ in CC $${_empty_var_} XCC X_
110.if ${cc} == "CC" || !empty(XCC)
111# Try to import COMPILER_TYPE and COMPILER_VERSION from parent make.
112# The value is only used/exported for the same environment that impacts
113# CC and COMPILER_* settings here.
114_exported_vars=	${X_}COMPILER_TYPE ${X_}COMPILER_VERSION \
115		${X_}COMPILER_FREEBSD_VERSION
116${X_}_cc_hash=	${${cc}}${MACHINE}${PATH}
117${X_}_cc_hash:=	${${X_}_cc_hash:hash}
118# Only import if none of the vars are set somehow else.
119_can_export=	yes
120.for var in ${_exported_vars}
121.if defined(${var})
122_can_export=	no
123.endif
124.endfor
125.if ${_can_export} == yes
126.for var in ${_exported_vars}
127.if defined(${var}.${${X_}_cc_hash})
128${var}=	${${var}.${${X_}_cc_hash}}
129.endif
130.endfor
131.endif
132
133.if ${cc} == "CC" || (${cc} == "XCC" && ${XCC} != ${CC})
134.if ${MACHINE} == "common"
135# common is a pseudo machine for architecture independent
136# generated files - thus there is no compiler.
137${X_}COMPILER_TYPE= none
138${X_}COMPILER_VERSION= 0
139${X_}COMPILER_FREEBSD_VERSION= 0
140.elif !defined(${X_}COMPILER_TYPE) || !defined(${X_}COMPILER_VERSION)
141_v!=	${${cc}:N${CCACHE_BIN}} --version || echo 0.0.0
142
143.if !defined(${X_}COMPILER_TYPE)
144. if ${${cc}:T:M*gcc*}
145${X_}COMPILER_TYPE:=	gcc
146. elif ${${cc}:T:M*clang*}
147${X_}COMPILER_TYPE:=	clang
148. elif ${_v:Mgcc}
149${X_}COMPILER_TYPE:=	gcc
150. elif ${_v:M\(GCC\)}
151${X_}COMPILER_TYPE:=	gcc
152. elif ${_v:Mclang}
153${X_}COMPILER_TYPE:=	clang
154. else
155.error Unable to determine compiler type for ${cc}=${${cc}}.  Consider setting ${X_}COMPILER_TYPE.
156. endif
157.endif
158.if !defined(${X_}COMPILER_VERSION)
159${X_}COMPILER_VERSION!=echo "${_v:M[1-9]*.[0-9]*}" | awk -F. '{print $$1 * 10000 + $$2 * 100 + $$3;}'
160.endif
161.undef _v
162.endif
163.if !defined(${X_}COMPILER_FREEBSD_VERSION)
164${X_}COMPILER_FREEBSD_VERSION!=	{ echo "__FreeBSD_cc_version" | ${${cc}:N${CCACHE_BIN}} -E - 2>/dev/null || echo __FreeBSD_cc_version; } | sed -n '$$p'
165# If we get a literal "__FreeBSD_cc_version" back then the compiler
166# is a non-FreeBSD build that doesn't support it or some other error
167# occurred.
168.if ${${X_}COMPILER_FREEBSD_VERSION} == "__FreeBSD_cc_version"
169${X_}COMPILER_FREEBSD_VERSION=	unknown
170.endif
171.endif
172
173${X_}COMPILER_FEATURES=
174.if ${${X_}COMPILER_TYPE} == "clang" || \
175	(${${X_}COMPILER_TYPE} == "gcc" && ${${X_}COMPILER_VERSION} >= 40800)
176${X_}COMPILER_FEATURES+=	c++11
177.endif
178.if ${${X_}COMPILER_TYPE} == "clang" && ${${X_}COMPILER_VERSION} >= 60000
179${X_}COMPILER_FEATURES+=	retpoline
180.endif
181
182.else
183# Use CC's values
184X_COMPILER_TYPE=	${COMPILER_TYPE}
185X_COMPILER_VERSION=	${COMPILER_VERSION}
186X_COMPILER_FREEBSD_VERSION=	${COMPILER_FREEBSD_VERSION}
187X_COMPILER_FEATURES=	${COMPILER_FEATURES}
188.endif	# ${cc} == "CC" || (${cc} == "XCC" && ${XCC} != ${CC})
189
190# Export the values so sub-makes don't have to look them up again, using the
191# hash key computed above.
192.for var in ${_exported_vars}
193${var}.${${X_}_cc_hash}:=	${${var}}
194.export-env ${var}.${${X_}_cc_hash}
195.undef ${var}.${${X_}_cc_hash}
196.endfor
197
198.endif	# ${cc} == "CC" || !empty(XCC)
199.endfor	# .for cc in CC XCC
200
201.include <bsd.linker.mk>
202.endif	# !target(__<bsd.compiler.mk>__)
203