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configure: use additive warnings instead of subtracting from -Wall

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-Wall varies too much by compiler and version. rather than trying to
track all the unwanted style warnings that need to be subtracted, just
enable wanted warnings.

also, move -Wno-pointer-to-int-cast outside --enable-warnings
conditional so that it always applies, since it's turning off a
nuisance warning that's on-by-default with most compilers.
This commit is contained in:
Rich Felker 2020-08-27 20:39:41 -04:00
parent e7f808e359
commit 0a312d34b9
1 changed files with 15 additions and 9 deletions
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24
configure vendored
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@ -508,10 +508,13 @@ fi
# #
# GCC defines -w as overriding any -W options, regardless of order, but # 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 # 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. # to start from a clean slate. So use -w if building with clang. Also
# turn off a common on-by-default cast warning regardless of compiler.
# #
test "$cc_family" = clang && tryflag CFLAGS_AUTO -w test "$cc_family" = clang && tryflag CFLAGS_AUTO -w
tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast
# #
# Even with -std=c99, gcc accepts some constructs which are constraint # Even with -std=c99, gcc accepts some constructs which are constraint
# violations. We want to treat these as errors regardless of whether # violations. We want to treat these as errors regardless of whether
@ -535,14 +538,17 @@ tryflag CFLAGS_AUTO -Werror=discarded-array-qualifiers
test "$cc_family" = clang && tryflag CFLAGS_AUTO -Qunused-arguments test "$cc_family" = clang && tryflag CFLAGS_AUTO -Qunused-arguments
if test "x$warnings" = xyes ; then if test "x$warnings" = xyes ; then
tryflag CFLAGS_AUTO -Wall tryflag CFLAGS_AUTO -Waddress
tryflag CFLAGS_AUTO -Wno-parentheses tryflag CFLAGS_AUTO -Warray-bounds
tryflag CFLAGS_AUTO -Wno-uninitialized tryflag CFLAGS_AUTO -Wchar-subscripts
tryflag CFLAGS_AUTO -Wno-missing-braces tryflag CFLAGS_AUTO -Wduplicate-decl-specifier
tryflag CFLAGS_AUTO -Wno-unused-value tryflag CFLAGS_AUTO -Winit-self
tryflag CFLAGS_AUTO -Wno-unused-but-set-variable tryflag CFLAGS_AUTO -Wreturn-type
tryflag CFLAGS_AUTO -Wno-unknown-pragmas tryflag CFLAGS_AUTO -Wsequence-point
tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast tryflag CFLAGS_AUTO -Wstrict-aliasing
tryflag CFLAGS_AUTO -Wunused-function
tryflag CFLAGS_AUTO -Wunused-label
tryflag CFLAGS_AUTO -Wunused-variable
fi fi
# Determine if the compiler produces position-independent code (PIC) # Determine if the compiler produces position-independent code (PIC)