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suppress unwanted warnings when configuring with clang 

coding style warnings enabled by default in clang have long been a
source of spurious questions/bug-reports. since clang provides a -w
that behaves differently from gcc's, and that lets us enable any
warnings we may actually want after turning them all off to start with
a clean slate, use it at configure time if clang is detected.
This commit is contained in:
Rich Felker 2020-06-01 20:53:42 -04:00
parent 8d81ba8c0b
commit c40157d87e
1 changed files with 7 additions and 0 deletions
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7
configure vendored
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@ -494,6 +494,13 @@ fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i48
fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic
fi
#
# GCC defines -w as overriding any -W options, regardless of order, but
# clang has a bunch of annoying warnings enabled by default and needs -w
# to start from a clean slate. So use -w if building with clang.
#
test "$cc_family" = clang && tryflag CFLAGS_AUTO -w
#
# Even with -std=c99, gcc accepts some constructs which are constraint
# violations. We want to treat these as errors regardless of whether