Bug 12314 - No LTO, LD silently links to non-IR code
Summary: No LTO, LD silently links to non-IR code
Status: RESOLVED FIXED
Alias: None
Product: binutils
Classification: Unclassified
Component: ld (show other bugs)
Version: 2.22
: P2 normal
Target Milestone: ---
Assignee: unassigned
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-12-13 19:32 UTC by Dmitry Gorbachev
Modified: 2012-12-07 20:07 UTC (History)
1 user (show)

See Also:
Host:
Target:
Build:
Last reconfirmed:

Attachments
Example (263 bytes, text/plain)
2010-12-13 19:32 UTC, Dmitry Gorbachev 		Details
A patch (612 bytes, patch)
2010-12-13 20:51 UTC, H.J. Lu 		Details | Diff
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Dmitry Gorbachev 2010-12-13 19:32:04 UTC 
Created attachment 5155 [details]
Example

I think that it would be good to give a warning in such situation...
Comment 1 H.J. Lu 2010-12-13 20:51:43 UTC 
Created attachment 5156 [details]
A patch
Comment 2 H.J. Lu 2010-12-13 20:53:31 UTC 
Fixed by commit 0ca9456fe1b8f0cf0793ca5e64317e658b18799c on
hjl/lto-mixed branch.
Comment 3 H.J. Lu 2011-01-23 19:12:29 UTC 
I checked in a different fix with commit baf9b44566e088687f28f9fe476122876c1d2f4d.
Now you will get

/usr/gcc-4.6/bin/gcc -B./ -O -flto   -c -o bar.o bar.c
ar cr libbar.a bar.o
/usr/gcc-4.6/bin/gcc -B./ -O -flto -fuse-linker-plugin -o prog1 -L. main.c -lbar foo.c
/tmp/cc9q7ek9.ltrans0.ltrans.o: In function `main':
cc9q7ek9.ltrans0.o:(.text+0x5): undefined reference to `bar'
collect2: ld returned 1 exit status
make: *** [prog1] Error 1
Comment 4 H.J. Lu 2012-12-07 20:07:16 UTC 
Works in 2.23 and tracked by "LTO 12a"/"LTO 12b" tests in ld-plugin.