879ce458f4
This change allows any downstream or otherwise consumer to easily override the new -fno-common default on a temporary basis without having to hack into src.sys.mk, and also makes it a bit easier to search for these specific cases where -fno-common must be overridden with -fcommon or else the build will fail. The gdb build, the only program requiring -fcommon on head/, is switched over as an example usage. It will need it on all branches, so this does not harm future mergability. MFC after: 3 days
46 lines
1.6 KiB
Makefile
46 lines
1.6 KiB
Makefile
# $FreeBSD$
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# Note: This file is also duplicated in the sys/conf/kern.pre.mk so
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# it will always grab SRCCONF, even if it isn't being built in-tree
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# to preserve historical (and useful) behavior. Changes here need to
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# be reflected there so SRCCONF isn't included multiple times.
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.if !defined(_WITHOUT_SRCCONF)
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# Allow user to configure things that only effect src tree builds.
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SRCCONF?= /etc/src.conf
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.if !empty(SRCCONF) && \
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(exists(${SRCCONF}) || ${SRCCONF} != "/etc/src.conf") && \
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!target(_srcconf_included_)
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# Validate that the user didn't try setting an env-only variable in
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# their src.conf. This benefits from already including bsd.mkopt.mk.
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.for var in ${__ENV_ONLY_OPTIONS:O:u}
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__presrcconf_${var}:= ${MK_${var}:U-}${WITHOUT_${var}:Uno:Dyes}${WITH_${var}:Uno:Dyes}
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.endfor
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.sinclude "${SRCCONF}"
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_srcconf_included_: .NOTMAIN
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# Validate the env-only variables.
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.for var in ${__ENV_ONLY_OPTIONS:O:u}
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__postrcconf_${var}:= ${MK_${var}:U-}${WITHOUT_${var}:Uno:Dyes}${WITH_${var}:Uno:Dyes}
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.if ${__presrcconf_${var}} != ${__postrcconf_${var}}
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.error Option ${var} may only be defined in ${SRC_ENV_CONF}, environment, or make argument, not ${SRCCONF}.
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.endif
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.undef __presrcconf_${var}
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.undef __postrcconf_${var}
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.endfor
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.endif # SRCCONF
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.endif
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# The following should be removed no earlier than LLVM11 being imported into the
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# tree, to ensure we don't regress the build. LLVM11 and GCC10 will switch the
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# default over to -fno-common, making this redundant.
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CFCOMMONFLAG?= -fno-common
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CFLAGS+= ${CFCOMMONFLAG}
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# tempting, but bsd.compiler.mk causes problems this early
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# probably need to remove dependence on bsd.own.mk
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#.include "src.opts.mk"
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