diff options
| author | H.J. Lu <hongjiu.lu@intel.com> | 2019-02-23 19:39:35 +0000 |
|---|---|---|
| committer | H.J. Lu <hjl@gcc.gnu.org> | 2019-02-23 11:39:35 -0800 |
| commit | aebe10d48ccc217273ee8a4e2c3805ed1e173a78 (patch) | |
| tree | 8adfb00f7eaa823c09b2fa514cf58c21740af52b /gcc/doc | |
| parent | 85627e2a9e9808c49da92b943a3c8e22106bf9aa (diff) | |
| download | gcc-aebe10d48ccc217273ee8a4e2c3805ed1e173a78.zip gcc-aebe10d48ccc217273ee8a4e2c3805ed1e173a78.tar.gz gcc-aebe10d48ccc217273ee8a4e2c3805ed1e173a78.tar.bz2 | |
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.
From-SVN: r269164
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/options.texi | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/gcc/doc/options.texi b/gcc/doc/options.texi index 0081243..1c83d24 100644 --- a/gcc/doc/options.texi +++ b/gcc/doc/options.texi @@ -220,7 +220,11 @@ property is used. The option will turn off another option @var{othername}, which is the option name with the leading ``-'' removed. This chain action will propagate through the @code{Negative} property of the option to be -turned off. +turned off. The driver will prune options, removing those that are +turned off by some later option. This pruning is not done for options +with @code{Joined} or @code{JoinedOrMissing} properties, unless the +options have either @code{RejectNegative} property or the @code{Negative} +property mentions an option other than itself. As a consequence, if you have a group of mutually-exclusive options, their @code{Negative} properties should form a circular chain. |