[PATCH] macros: Use conservative default for malloc(0) when cross-compiling #24460

[Gaetan Nadon]

Hi,

When cross-compiling, configuration stops with an error:


        configure: error: cannot run test program while cross compiling


With the patch applied:


        checking whether malloc(0) returns NULL... yes


Colin wrote in bug 24460:


        add fourth argument to AC_RUN_IFELSE
        
        libX11 fails to cross-compile unless --enable-malloc0returnsnull is given
        during configuration, since configure can't run test programs in this
        situation. This is a sensible conservative default that should be used by
        default when cross-compiling rather than requiring it to be forced explicitly.


Regards,
Gaetan


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