This documents new GCC 10 behavior on diagnostic options and -flto.
Looks OK?
Thanks,
Richard.
2020-05-19 Richard Biener <rguent...@suse.de>
PR lto/95190
* doc/invoke.texi (flto): Document behavior of diagnostic
options.
---
gcc/doc/invoke.texi | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 850aeac033d..f7056b2f396 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
--
2.26.1
