Fix compiler warnings on PPC64 and others
PATCH 1/1 Fix compiler warnings on PPC64 and others
We have places in our code that assume __u64 is unsigned long long, and in general this is the Linux kernel standard. However a few archs still use unsigned long by default and require a -D__SANE_USERSPACE_TYPES__ to get long long.
Detect this and provide the define to eliminate compilation warnings.
--- CMakeLists.txt | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
CMakeLists.txt +14 -0
@@ -250,6 +250,20 @@ CHECK_C_SOURCE_COMPILES(" HAVE_FUNC_ATTRIBUTE_ALWAYS_INLINE FAIL_REGEX "warning") +# Linux __u64 is an unsigned long long +CHECK_C_SOURCE_COMPILES(" +#include <linux/types.h> + int main(int argc,const char *argv[]) { __u64 tmp = 0; unsigned long long *tmp2 = &tmp; return *tmp2; }" + HAVE_LONG_LONG_U64 + FAIL_REGEX "warning") + +if (NOT HAVE_LONG_LONG_U64) + # Modern Linux has switched to use ull in all cases, but to avoid disturbing + # userspace some platforms continued to use unsigned long by default. This + # define will cause kernel headers to consistently use unsigned long long + add_definitions("-D__SANE_USERSPACE_TYPES__") +endif() + # Provide a shim if C11 stdatomic.h is not supported. if (NOT HAVE_SPARSE) CHECK_INCLUDE_FILE("stdatomic.h" HAVE_STDATOMIC)
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