https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66650
--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> --- Patch that rewrites GFC_DTYPE_SIZE_MASK definition to avoid "left shift of negative value" warning: --cut here-- Index: libgfortran.h =================================================================== --- libgfortran.h (revision 226339) +++ libgfortran.h (working copy) @@ -404,8 +404,7 @@ /* Macros to get both the size and the type with a single masking operation */ -#define GFC_DTYPE_SIZE_MASK \ - ((~((index_type) 0) >> GFC_DTYPE_SIZE_SHIFT) << GFC_DTYPE_SIZE_SHIFT) +#define GFC_DTYPE_SIZE_MASK (-((index_type) 1 << GFC_DTYPE_SIZE_SHIFT)) #define GFC_DTYPE_TYPE_SIZE_MASK (GFC_DTYPE_SIZE_MASK | GFC_DTYPE_TYPE_MASK) #define GFC_DTYPE_TYPE_SIZE(desc) ((desc)->dtype & GFC_DTYPE_TYPE_SIZE_MASK) --cut here--
