en Copyright 2015 Java http://172.16.0.5:8080/history/freebsd-12.1/tools/build/options/WITHOUT_SYSTEM_COMPILER#6120aabd Opportunistically skip building a cross-compiler with SYSTEM_COMPILER set.This will still build the compiler for the target but will not build thebootstrap cross-compiler in the cross-tools phase. Other toolchainbootstrapping, such as elftoolchan and binutils, currently still occurs.This will utilize the default CC (cc, /usr/bin/cc) as an external compiler.This is planned to be on-by-default eventually.This will utilize the __FreeBSD_cc_version compiler macro defined in thesource tree and compare it to CC's version. If they match then thecross-compiler is skipped. If [X]CC is an external compiler (absolutepath) or WITHOUT_CROSS_COMPILER is already set, then this logic is skipped.If the expected bootstrap compiler type no longer matches the found CCcompiler type (clang vs gcc), then the logic is skipped. As an extrasafety check the version number is also compared from the compiler tothe tree version.Clang: The macro FREEBSD_CC_VERSION is defined in: lib/clang/include/clang/Basic/Version.inc For clang -target will be used if TARGET_ARCH != MACHINE_ARCH. This is from the current external toolchain logic. There is currently an assumption that the host compiler can build the TARGET_ARCH. This will usually be the case since we don't conditionalize target arch support in clang, but it will break when introducing new architectures. This problem is mitigated by incrementing the version when adding new architectures.GCC: The macro FBSD_CC_VER is defined in: gnu/usr.bin/cc/cc_tools/freebsd-native.h For GCC there is no simple -target support when TARGET_ARCH != MACHINE_ARCH. In this case the opportunistic skip is not done. If we add proper support for this case in external toolchain logic then it will be fine to enable.This relies on the macros being incremented whenever any change occursto these compilers that warrant rebuilding files. It also should neverrepeat earlier values.Reviewed by: brooks, bapt, impSponsored by: EMC / Isilon Storage DivisionDifferential Revision: https://reviews.freebsd.org/D6357 List of files: /freebsd-12.1/tools/build/options/WITHOUT_SYSTEM_COMPILER Sat, 21 May 2016 01:32:23 +0000 Bryan Drewery <bdrewery@FreeBSD.org>