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bsd.compiler.mk: Detect distribution-provided GCC when executed as cc

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Clang always prints "clang $VERSION" regardless of the name used to
execute it, whereas GCC prints "$progname $VERSION", meaning if CC is
set to cc and cc is GCC it will print "cc $VERSION". We are able to
detect some of those cases since it then prints "($PKGVERSION)", where
the default is "GCC", but many distributions override that to print
their name and the package version number (e.g. "Debian 10.2.1-6"), so
nothing tells us it's GCC other than the fact that it's not Clang (and
that there's an FSF copyright disclaimer).

However, GCC's -v option will always print "gcc version $VERSION", so
fall back on using that to detect GCC. Whilst Clang also supports this
option, we should never get here, so Clang handling is not added.

Reviewed by:	brooks, emaste, arichardson
Differential Revision:	https://reviews.freebsd.org/D28315
This commit is contained in:
Jessica Clarke 2021-02-09 21:40:24 +00:00
parent ac76bc1145
commit 9c6954329a
1 changed files with 9 additions and 0 deletions
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9
share/mk/bsd.compiler.mk
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@ -187,7 +187,16 @@ ${X_}COMPILER_TYPE:= gcc
. elif ${_v:Mclang} || ${_v:M(clang-*.*.*)}
${X_}COMPILER_TYPE:= clang
. else
# With GCC, cc --version prints "cc $VERSION ($PKGVERSION)", so if a
# distribution overrides the default GCC PKGVERSION it is not identified.
# However, its -v output always says "gcc version" in it, so fall back on that.
_gcc_version!= ${${cc}:N${CCACHE_BIN}} -v 2>&1 | grep "gcc version"
. if !empty(_gcc_version)
${X_}COMPILER_TYPE:= gcc
. else
.error Unable to determine compiler type for ${cc}=${${cc}}. Consider setting ${X_}COMPILER_TYPE.
. endif
.undef _gcc_version
. endif
.endif
.if !defined(${X_}COMPILER_VERSION)