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Build: Make configure add more warning flags for GCC and Clang.
-Wstrict-aliasing was removed from the list since it is enabled by -Wall already. A normal build is clean with these on GNU/Linux x86-64 with GCC 12.2.0 and Clang 14.0.6.
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configure.ac
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configure.ac
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@ -1029,26 +1029,35 @@ if test "$GCC" = yes ; then
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# backed up with "return LZMA_PROG_ERROR".
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# backed up with "return LZMA_PROG_ERROR".
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# * -Wcast-qual would break various things where we need a non-const
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# * -Wcast-qual would break various things where we need a non-const
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# pointer although we don't modify anything through it.
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# pointer although we don't modify anything through it.
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# * -Wcast-align breaks optimized CRC32 and CRC64 implementation
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# on some architectures (not on x86), where this warning is bogus,
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# because we take care of correct alignment.
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# * -Winline, -Wdisabled-optimization, -Wunsafe-loop-optimizations
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# * -Winline, -Wdisabled-optimization, -Wunsafe-loop-optimizations
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# don't seem so useful here; at least the last one gives some
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# don't seem so useful here; at least the last one gives some
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# warnings which are not bugs.
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# warnings which are not bugs.
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# * -Wconversion still shows too many warnings.
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#
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# The flags before the empty line are for GCC and many of them
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# are supported by Clang too. The flags after the empty line are
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# for Clang.
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for NEW_FLAG in \
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for NEW_FLAG in \
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-Wall \
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-Wall \
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-Wextra \
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-Wextra \
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-Wvla \
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-Wvla \
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-Wc99-c11-compat \
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-Wformat=2 \
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-Wformat=2 \
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-Winit-self \
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-Winit-self \
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-Wmissing-include-dirs \
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-Wmissing-include-dirs \
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-Wstrict-aliasing \
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-Wshift-overflow=2 \
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-Wstrict-overflow=3 \
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-Walloc-zero \
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-Wduplicated-cond \
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-Wfloat-equal \
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-Wfloat-equal \
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-Wundef \
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-Wundef \
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-Wshadow \
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-Wshadow \
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-Wpointer-arith \
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-Wpointer-arith \
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-Wbad-function-cast \
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-Wbad-function-cast \
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-Wwrite-strings \
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-Wwrite-strings \
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-Wdate-time \
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-Wsign-conversion \
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-Wfloat-conversion \
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-Wlogical-op \
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-Wlogical-op \
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-Waggregate-return \
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-Waggregate-return \
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-Wstrict-prototypes \
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-Wstrict-prototypes \
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@ -1056,7 +1065,24 @@ if test "$GCC" = yes ; then
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-Wmissing-prototypes \
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-Wmissing-prototypes \
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-Wmissing-declarations \
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-Wmissing-declarations \
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-Wmissing-noreturn \
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-Wmissing-noreturn \
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-Wredundant-decls
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-Wredundant-decls \
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\
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-Wc99-compat \
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-Wc11-extensions \
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-Wc2x-compat \
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-Wc2x-extensions \
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-Wpre-c2x-compat \
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-Warray-bounds-pointer-arithmetic \
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-Wassign-enum \
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-Wconditional-uninitialized \
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-Wdocumentation \
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-Wduplicate-enum \
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-Wempty-translation-unit \
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-Wflexible-array-extensions \
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-Wmissing-variable-declarations \
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-Wnewline-eof \
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-Wshift-sign-overflow \
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-Wstring-conversion
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do
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do
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AC_MSG_CHECKING([if $CC accepts $NEW_FLAG])
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AC_MSG_CHECKING([if $CC accepts $NEW_FLAG])
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OLD_CFLAGS="$CFLAGS"
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OLD_CFLAGS="$CFLAGS"
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