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bsd.compiler.mk: detect Apple Clang for cross-builds

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Apple clang uses a different versioning scheme, so if we enable or
disable certain warnings for Clang 11+, those might not be supported
in Apple Clang 11+. This adds 'apple-clang' to COMPILER_FEATURES, so that
bootstrap tools Makefiles can avoid warnings on macOS.

Reviewed By:	imp
Differential Revision: https://reviews.freebsd.org/D29680
This commit is contained in:
Alex Richardson 2021-04-20 01:46:36 +01:00
parent faa9ad8a90
commit ba1182e263
1 changed files with 11 additions and 1 deletions
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12
share/mk/bsd.compiler.mk
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@ -26,6 +26,12 @@
# mitigation.
# - init-all: supports stack variable initialization.
#
# When bootstrapping on macOS, 'apple-clang' will be set in COMPILER_FEATURES
# to differentiate Apple's version of Clang. Apple Clang uses a different
# versioning scheme and may not support the same -W/-Wno warning flags. For a
# mapping of Apple Clang versions to upstream clang versions see
# https://en.wikipedia.org/wiki/Xcode#Xcode_7.0_-_12.x_(since_Free_On-Device_Development)
#
# These variables with an X_ prefix will also be provided if XCC is set.
#
# This file may be included multiple times, but only has effect the first time.
@ -202,6 +208,10 @@ ${X_}COMPILER_TYPE:= gcc
.if !defined(${X_}COMPILER_VERSION)
${X_}COMPILER_VERSION!=echo "${_v:M[1-9]*.[0-9]*}" | awk -F. '{print $$1 * 10000 + $$2 * 100 + $$3;}'
.endif
# Detect apple clang when bootstrapping to select appropriate warning flags.
.if !defined(${X_}COMPILER_FEATURES) && ${_v:[*]:M*Apple clang version*}
${X_}COMPILER_FEATURES= apple-clang
.endif
.undef _v
.endif
.if !defined(${X_}COMPILER_FREEBSD_VERSION)
@ -218,7 +228,7 @@ ${X_}COMPILER_FREEBSD_VERSION= unknown
${X_}COMPILER_RESOURCE_DIR!= ${${cc}:N${CCACHE_BIN}} -print-resource-dir 2>/dev/null || echo unknown
.endif
${X_}COMPILER_FEATURES= c++11 c++14
${X_}COMPILER_FEATURES+= c++11 c++14
.if ${${X_}COMPILER_TYPE} == "clang" || \
(${${X_}COMPILER_TYPE} == "gcc" && ${${X_}COMPILER_VERSION} >= 70000)
${X_}COMPILER_FEATURES+= c++17