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This is a new version of the patch submitted here: https://gcc.gnu.org/ml/gcc-patches/2014-11/msg00663.html but handling (some) escape sequences. I could not figure out a way to re-use the code from libcpp for this, thus I implemented a simple function that given a string and offset in bytes, it computes the visual column corresponding to that offset. The function is very conservative: As soon as something unknown or inconsistent is detected, it returns zero, thus preserving the current behavior. This also preserves the current behavior for non-concatenated tokens. Bootstrapped and regression tested on x86_64-linux-gnu. OK? gcc/testsuite/ChangeLog: 2015-05-20 Manuel LÃpez-IbÃÃez <manu@gcc.gnu.org> PR c/52952 * gcc.dg/redecl-4.c: Update column numbers. * gcc.dg/format/bitfld-1.c: Likewise. * gcc.dg/format/attr-2.c: Likewise. * gcc.dg/format/attr-6.c: Likewise. * gcc.dg/format/attr-7.c (baz): Likewise. * gcc.dg/format/asm_fprintf-1.c: Likewise. * gcc.dg/format/attr-4.c: Likewise. * gcc.dg/format/branch-1.c: Likewise. * gcc.dg/format/c90-printf-1.c: Likewise. Add tests for column locations within strings with embedded escape sequences. gcc/c-family/ChangeLog: 2015-05-20 Manuel LÃpez-IbÃÃez <manu@gcc.gnu.org> PR c/52952 * c-format.c (location_column_from_byte_offset): New. (location_from_offset): New. (struct format_wanted_type): Add offset_loc field. (check_format_info): Move handling of location for extra arguments closer to the point of warning. (check_format_arg): Set offset_is_invalid. (check_format_info_main): Pass the result of location_from_offset to warning_at. (format_type_warning): Pass the result of location_from_offset to warning_at.
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