https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69471
--- Comment #10 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> --- Author: hjl Date: Sat Feb 23 19:39:35 2019 New Revision: 269164 URL: https://gcc.gnu.org/viewcvs?rev=269164&root=gcc&view=rev Log: driver: Also prune joined switches with negation When -march=native is passed to host_detect_local_cpu to the backend, it overrides all command lines after it. That means $ gcc -march=native -march=skylake-avx512 is the treated as $ gcc -march=skylake-avx512 -march=native Prune joined switches with Negative and RejectNegative to allow -march=skylake-avx512 to override previous -march=native on command-line. gcc/ PR driver/69471 * opts-common.c (prune_options): Also prune joined switches with Negative and RejectNegative. * config/i386/i386.opt (march=): Add Negative(march=). (mtune=): Add Negative(mtune=). * doc/options.texi: Document Negative used together with Joined and RejectNegative. gcc/testsuite/ PR driver/69471 * gcc.dg/pr69471-1.c: New test. * gcc.dg/pr69471-2.c: Likewise. * gcc.target/i386/pr69471-3.c: Likewise. Added: trunk/gcc/testsuite/gcc.dg/pr69471-1.c trunk/gcc/testsuite/gcc.dg/pr69471-2.c trunk/gcc/testsuite/gcc.target/i386/pr69471-3.c Modified: trunk/gcc/ChangeLog trunk/gcc/config/i386/i386.opt trunk/gcc/doc/options.texi trunk/gcc/opts-common.c trunk/gcc/testsuite/ChangeLog
