2017-12-10  Dominique d'Humieres  <dominiq@lps.ens.fr>

	PR fortran/53478
	* gfortran.h (gfc_find_case_gsymbol): New prototype.
	* symbol.c (gfc_find_case_gsymbol): New procedure, case
	insensistive version of gfc_find_gsymbol.
	* resolve.c (resolve_common_blocks): Use it.
	Replace %s with %qs where needed.

	* gfortran.dg/binding_label_tests_4.f03: Update dg-error.
	* gfortran.dg/binding_label_tests_6.f03: Likewise.
	* gfortran.dg/binding_label_tests_7.f03: Likewise.
	* gfortran.dg/binding_label_tests_8.f03: Likewise.
	* gfortran.dg/binding_label_tests_10_main.f03: Likewise.
	* gfortran.dg/binding_label_tests_11_main.f03: Likewise.
	* gfortran.dg/binding_label_tests_13_main.f03: Likewise.
	* gfortran.dg/test_common_binding_labels_3_main.f03: Likewise.
	* gfortran.dg/binding_label_tests_29.f90: New test.

From-SVN: r255530