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Avoid recomputing COMPILER_/LINKER_ variables when set explicitly

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I noticed that when we build libraries for a different ABI (in CheriBSD) we
were calling ${XCC}/${LD} --version for every directory. It turns out that
this was caused by bsd.compat.mk explicitly setting (X_)COMPILER variables
for that build stage and this stops the _can_export logic from working.
To fix this, we change the check to only set _can_export=no if the variable
is set and it is set to a different value than the cached value.
This noticeably speeds up the tree walk while building compat libraries.
During an upstream amd64 buildworld this also removes 8 --version calls.

Obtained from:	CheriBSD
Reviewed By:	brooks, emaste
Differential Revision: https://reviews.freebsd.org/D25986
This commit is contained in:
Alex Richardson 2020-08-26 10:21:38 +00:00
parent 18de62a94a
commit 489377c0a4
2 changed files with 10 additions and 4 deletions
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7
share/mk/bsd.compiler.mk
View File

@ -146,10 +146,13 @@ _exported_vars= ${X_}COMPILER_TYPE ${X_}COMPILER_VERSION \
${X_}COMPILER_FREEBSD_VERSION ${X_}COMPILER_RESOURCE_DIR
${X_}_cc_hash= ${${cc}}${MACHINE}${PATH}
${X_}_cc_hash:= ${${X_}_cc_hash:hash}
# Only import if none of the vars are set somehow else.
# Only import if none of the vars are set differently somehow else.
_can_export= yes
.for var in ${_exported_vars}
.if defined(${var})
.if defined(${var}) && (!defined(${var}__${${X_}_cc_hash}) || ${${var}__${${X_}_cc_hash}} != ${${var}})
.if defined(${var}__${${X_}_ld_hash})
.info "Cannot import ${X_}COMPILER variables since cached ${var} is different: ${${var}__${${X_}_cc_hash}} != ${${var}}"
.endif
_can_export= no
.endif
.endfor

7
share/mk/bsd.linker.mk
View File

@ -41,10 +41,13 @@ _exported_vars= ${X_}LINKER_TYPE ${X_}LINKER_VERSION ${X_}LINKER_FEATURES \
${X_}LINKER_FREEBSD_VERSION
${X_}_ld_hash= ${${ld}}${MACHINE}${PATH}
${X_}_ld_hash:= ${${X_}_ld_hash:hash}
# Only import if none of the vars are set somehow else.
# Only import if none of the vars are set differently somehow else.
_can_export= yes
.for var in ${_exported_vars}
.if defined(${var})
.if defined(${var}) && (!defined(${var}__${${X_}_ld_hash}) || ${${var}__${${X_}_ld_hash}} != ${${var}})
.if defined(${var}__${${X_}_ld_hash})
.info "Cannot import ${X_}LINKER variables since cached ${var} is different: ${${var}__${${X_}_ld_hash}} != ${${var}}"
.endif
_can_export= no
.endif
.endfor