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| author | H. Peter Anvin (Intel) <hpa@zytor.com> | 2018-12-12 15:56:28 -0800 |
|---|---|---|
| committer | H. Peter Anvin (Intel) <hpa@zytor.com> | 2018-12-12 15:56:28 -0800 |
| commit | 64b56eaa3961038302ea3a8cc20d1f39c8d03c01 (patch) | |
| tree | 0e18a4400519aa496d757b3429f1326986e4d849 /configure.ac | |
| parent | 77f53ba6d4cb90e5a7e09b33357ed7c1fe9f6b9d (diff) | |
| download | nasm-64b56eaa3961038302ea3a8cc20d1f39c8d03c01.tar.gz | |
configure: add -Wno-shift-negative-value
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>
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index e707158c..38b3b596 100644 --- a/configure.ac +++ b/configure.ac @@ -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], |