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PR debug/37738 * dwarf2out.c (common_block_die_table): New variable. (common_block_die_table_hash, common_block_die_table_eq): New functions. (gen_variable_die): Look up a DW_TAG_common_block die for a particular COMMON block in the current scope rather than globally. Optimize DW_OP_addr SYMBOL_REF DW_OP_plus_uconst off into DW_OP_addr SYMBOL_REF+off. * gfortran.dg/debug/pr37738.f: New test. From-SVN: r140944
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