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configure: add -Wno-shift-negative-value

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Shifting negative values is undefined in standard C, but we have tons
of dependencies that signed arithmetic is 2's-complement in the code
anyway, and on gcc-like compilers we pass the -fwrapv option to
indicate exactly that. Therefore, this is not a valid warning in our
case and should be suppressed.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin (Intel) 2018-12-12 15:56:28 -08:00
parent 77f53ba6d4
commit 64b56eaa39
1 changed files with 5 additions and 0 deletions
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configure.ac
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@ -281,6 +281,11 @@ PA_ADD_CFLAGS([-Wlong-long],[-Wno-long-long])
dnl This is needed because we intentionally expect strncpy() to fill
dnl in a zero-padded (not zero-terminated) buffer in several backends
PA_ADD_CFLAGS([-Wstringop-truncation],[-Wno-stringop-truncation])
dnl This is needed because we assume 2's-completement signed arithmetic;
dnl on compilers with gcc-like command line syntax we pass the -fwrapv
dnl option for exactly that reason.
PA_ADD_CFLAGS([-Wshift-negative-value],[-Wno-shift-negative-value])
dnl PA_ADD_CFLAGS([-Wwrite-strings])
PA_ARG_ENABLED([werror],
[compile with -Werror to error out on any warning],