From ab7eca92926fdc1da880120c116a1832fce56a29 Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Tue, 19 May 2020 08:36:13 +0200 Subject: [PATCH] lto/95190 - amend -flto docs for diagnostic option handling This documents new GCC 10 behavior on diagnostic options and -flto. 2020-05-22 Richard Biener PR lto/95190 * doc/invoke.texi (flto): Document behavior of diagnostic options. --- gcc/ChangeLog | 6 ++++++ gcc/doc/invoke.texi | 8 ++++++++ 2 files changed, 14 insertions(+) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 390a344..0c3045a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,11 @@ 2020-05-22 Richard Biener + PR lto/95190 + * doc/invoke.texi (flto): Document behavior of diagnostic + options. + +2020-05-22 Richard Biener + * tree-vectorizer.h (vect_is_simple_use): New overload. (vect_maybe_update_slp_op_vectype): New. * tree-vect-stmts.c (vect_is_simple_use): New overload diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 7217e27..8b9935d 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -11205,6 +11205,14 @@ conflicting translation units. Specifically precedence; and for example @option{-ffp-contract=off} takes precedence over @option{-ffp-contract=fast}. You can override them at link time. +Diagnostic options such as @option{-Wstringop-overflow} are passed +through to the link stage and their setting matches that of the +compile-step at function granularity. Note that this matters only +for diagnostics emitted during optimization. Note that code +transforms such as inlining can lead to warnings being enabled +or disabled for regions if code not consistent with the setting +at compile time. + When you need to pass options to the assembler via @option{-Wa} or @option{-Xassembler} make sure to either compile such translation units with @option{-fno-lto} or consistently use the same assembler -- 2.7.4