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* [gcc r13-5347] Fixup LTO internal docs for option processing
@ 2023-01-25 12:37 Richard Biener
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From: Richard Biener @ 2023-01-25 12:37 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:64f66385086e6a957c337eef97aec01cf30c162d
commit r13-5347-g64f66385086e6a957c337eef97aec01cf30c162d
Author: Richard Biener <rguenther@suse.de>
Date: Wed Jan 25 13:28:01 2023 +0100
Fixup LTO internal docs for option processing
Andreas noticed that when I removed lto_read_all_file_options I
failed to update the internals manual which refers to it. The
following attempts to reflect the current situation.
* doc/lto.texi (Command line options): Reword and update reference
to removed lto_read_all_file_options.
Diff:
---
gcc/doc/lto.texi | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
diff --git a/gcc/doc/lto.texi b/gcc/doc/lto.texi
index e591e8d2915..eb5f54bf908 100644
--- a/gcc/doc/lto.texi
+++ b/gcc/doc/lto.texi
@@ -170,13 +170,11 @@ object files. This is used at link time to determine the optimization
level and other settings when they are not explicitly specified at the
linker command line.
-Currently, GCC does not support combining LTO object files compiled
-with different set of the command line options into a single binary.
-At link time, the options given on the command line and the options
-saved on all the files in a link-time set are applied globally. No
-attempt is made at validating the combination of flags (other than the
-usual validation done by option processing). This is implemented in
-@file{lto/lto.cc}:@code{lto_read_all_file_options}.
+Most options are recorded at a per function level and their setting
+restored when processing the functions at link time. Global options
+are composed from options specified at compile time and link time.
+How exactly they are combined or mismatches diagnosed is implemented in
+@file{lto-wrapper.cc}:@code{find_and_merge_options}.
@item Symbol table (@code{.gnu.lto_.symtab})
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