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compiler: -Werror=shift-overflow=2 hardening

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Warn about left shift overflows. This warning is enabled by default in
C99 and C++11 modes (and newer).

-Wshift-overflow=2
This warning level also warns about left-shifting 1 into the sign bit,
unless C++14 mode (or newer) is active.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2019-02-05 23:48:32 +01:00
parent 463bee7b8d
commit fcfce08aba
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GPG Key ID: 8EB056D53EECB12D
1 changed files with 1 additions and 0 deletions
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configure.ac
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@ -716,6 +716,7 @@ AX_CHECK_COMPILE_FLAG([-Wendif-labels], [CFLAGS="$CFLAGS -Wendif-labels"],,[-Wer
AX_CHECK_COMPILE_FLAG([-Werror=overflow], [CFLAGS="$CFLAGS -Werror=overflow"],,[-Werror])
AX_CHECK_COMPILE_FLAG([-fdiagnostics-show-option], [CFLAGS="$CFLAGS -fdiagnostics-show-option"],,[-Werror])
AX_CHECK_COMPILE_FLAG([-Werror=shift-count-overflow], [CFLAGS="$CFLAGS -Werror=shift-count-overflow"],,[-Werror])
AX_CHECK_COMPILE_FLAG([-Werror=shift-overflow=2], [CFLAGS="$CFLAGS -Werror=shift-overflow=2"],,[-Werror])
AX_CHECK_LINK_FLAG([-z relro], [LDLAGS="$LDLAGS -z relro"],,[])
AX_CHECK_LINK_FLAG([-z now], [LDLAGS="$LDLAGS -z now"],,[])