compiler: -Wlogical-op hardening

Warn about suspicious uses of logical operators in expressions. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

compiler: -Wlogical-op hardening
fb3b3ef4 · Christian Brauner · 9fb7aab8 · fb3b3ef4
Unverified Commit fb3b3ef4 authored Feb 05, 2019 by Christian Brauner
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configure.ac configure.ac +2 -0

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--- a/configure.ac
+++ b/configure.ac
@@ -690,6 +690,7 @@ AC_PROG_SED
 # See if we support thread-local storage.
 LXC_CHECK_TLS
+# Hardening flags
 AX_CHECK_COMPILE_FLAG([-fdiagnostics-color], [CFLAGS="$CFLAGS -fdiagnostics-color"],,[-Werror])
 AX_CHECK_COMPILE_FLAG([-Wimplicit-fallthrough], [CFLAGS="$CFLAGS -Wimplicit-fallthrough"],,[-Werror])
 AX_CHECK_COMPILE_FLAG([-Wcast-align], [CFLAGS="$CFLAGS -Wcast-align"],,[-Werror])
@@ -700,6 +701,7 @@ AX_CHECK_LINK_FLAG([-fstack-protector-strong], [CFLAGS="$CFLAGS -fstack-protecto
 AX_CHECK_COMPILE_FLAG([-g], [CFLAGS="$CFLAGS -g"],,[-Werror])
 AX_CHECK_COMPILE_FLAG([--mcet -fcf-protection], [CFLAGS="$CFLAGS --mcet -fcf-protection"],,[-Werror])
 AX_CHECK_COMPILE_FLAG([-Werror=implicit-function-declaration], [CFLAGS="$CFLAGS -Werror=implicit-function-declaration"],,[-Werror])
+AX_CHECK_COMPILE_FLAG([-Wlogical-op], [CFLAGS="$CFLAGS -Wlogical-op"],,[-Werror])
 AX_CHECK_LINK_FLAG([-z relro], [LDLAGS="$LDLAGS -z relro"],,[])
 AX_CHECK_LINK_FLAG([-z now], [LDLAGS="$LDLAGS -z now"],,[])