compiler: -Werror=return-type hardening

Warn whenever a function is defined with a return type that defaults to int. Also warn about any return statement with no return value in a function whose return type is not void (falling off the end of the function body is considered returning without a value). For C only, warn about a return statement with an expression in a function whose return type is void, unless the expression type is also void. As a GNU extension, the latter case is accepted without a warning unless -Wpedantic is used. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

compiler: -Werror=return-type hardening
f987808e · Christian Brauner · 4ad0b8e8 · f987808e
Unverified Commit f987808e authored Feb 05, 2019 by Christian Brauner
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configure.ac configure.ac +1 -0

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--- a/configure.ac
+++ b/configure.ac
@@ -699,6 +699,7 @@ AX_CHECK_COMPILE_FLAG([-Wold-style-definition], [CFLAGS="$CFLAGS -Wold-style-def
 AX_CHECK_COMPILE_FLAG([-Winit-self], [CFLAGS="$CFLAGS -Winit-self"],,[-Werror])
 AX_CHECK_COMPILE_FLAG([-Wfloat-equal], [CFLAGS="$CFLAGS -Wfloat-equal"],,[-Werror])
 AX_CHECK_COMPILE_FLAG([-Wsuggest-attribute=noreturn], [CFLAGS="$CFLAGS -Wsuggest-attribute=noreturn"],,[-Werror])
+AX_CHECK_COMPILE_FLAG([-Werror=return-type], [CFLAGS="$CFLAGS -Werror=return-type"],,[-Werror])
 AX_CHECK_LINK_FLAG([-z relro], [LDLAGS="$LDLAGS -z relro"],,[])
 AX_CHECK_LINK_FLAG([-z now], [LDLAGS="$LDLAGS -z now"],,[])