[2/7,v2] lto: Remove random_seed from section name.
Commit Message
This patch removes suffixes from section names during LTO linking.
These suffixes were originally added for ld -r to work (PR lto/44992).
They were added to all LTO object files, but are only useful before WPA.
After that they waste space, and if kept random, make LTO caching impossible.
Bootstrapped/regtested on x86_64-pc-linux-gnu
gcc/ChangeLog:
* lto-streamer.cc (lto_get_section_name): Remove suffixes after WPA.
gcc/lto/ChangeLog:
* lto-common.cc (lto_section_with_id): Dont load suffix during LTRANS.
---
gcc/lto-streamer.cc | 11 +++++++++--
gcc/lto/lto-common.cc | 7 +++++++
2 files changed, 16 insertions(+), 2 deletions(-)
@@ -132,11 +132,18 @@ lto_get_section_name (int section_type, const char *name,
doesn't confuse the reader with merged sections.
For options don't add a ID, the option reader cannot deal with them
- and merging should be ok here. */
- if (section_type == LTO_section_opts)
+ and merging should be ok here.
+
+ LTRANS files (output of wpa, input and output of ltrans) are handled
+ directly inside of linker/lto-wrapper, so name uniqueness for external
+ tools is not needed.
+ Randomness would inhibit incremental LTO. */
+ if (section_type == LTO_section_opts || flag_ltrans)
strcpy (post, "");
else if (f != NULL)
sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, f->id);
+ else if (flag_wpa)
+ strcpy (post, "");
else
sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, get_random_seed (false));
char *res = concat (section_name_prefix, sep, add, post, NULL);
@@ -2174,6 +2174,13 @@ lto_section_with_id (const char *name, unsigned HOST_WIDE_INT *id)
if (strncmp (name, section_name_prefix, strlen (section_name_prefix)))
return 0;
+
+ if (flag_ltrans)
+ {
+ *id = 0;
+ return 1;
+ }
+
s = strrchr (name, '.');
if (!s)
return 0;