Hi, I'm new to contributing to GCC, so I looked for issues in Bugzilla with the keyword "easyhack" that looked comprehensible to me, and found bug 53920: "'gcc -E' does not honor #pragma GCC diagnostic ignored '-Wunused-macro'". I verified using a fresh build of gcc from the master branch that when "gcc -E -Wunused-macros" is used to invoke the preprocessor on the following two lines, a warning is given for the unused FOO macro despite the #pragma directive:
#pragma GCC diagnostic ignored "-Wunused-macros" #define FOO My impression is that the preprocessor is ignoring the content of pragma diagnostics when invoked with -E, and that the proposed change is to add support for handling pragma diagnostics for this use case. The Bugzilla entry for this issue hasn't been commented on since 2013, so I want to make sure this is actually a good thing to work on. Might there be a reason why support for handling pragma diagnostics is missing from c-ppoutput.c? Thanks, Chelsea Meyers
