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Bug 450967 - bad code produced under -O0 -ftest-coverage
Summary: bad code produced under -O0 -ftest-coverage
Keywords:
Status: CLOSED UPSTREAM
Alias: None
Product: Fedora
Classification: Fedora
Component: gcc
Version: 9
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Jakub Jelinek
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2008-06-11 22:19 UTC by Roland McGrath
Modified: 2008-06-12 13:04 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2008-06-12 13:04:08 UTC


Attachments (Terms of Use)
test case preprocessed C source (deleted)
2008-06-11 22:19 UTC, Roland McGrath
no flags Details


Links
System ID Priority Status Summary Last Updated
GNU Compiler Collection 36507 None None None Never

Description Roland McGrath 2008-06-11 22:19:56 UTC
Description of problem:


Version-Release number of selected component (if applicable):
gcc version 4.3.0 20080428 (Red Hat 4.3.0-8) (GCC) 
x86_64

How reproducible:
100%

Steps to Reproduce:
1./usr/libexec/gcc/x86_64-redhat-linux/4.3.0/cc1 -fpreprocessed regset-x86_64.i
-quiet -dumpbase regset-x86_64.c -mtune=generic -auxbase-strip
libutrace_a-regset-x86_64.o -g -Wall -std=gnu99 -version -fprofile-arcs
-ftest-coverage -o regset-x86_64.s
2.Look in regset-x86_64.s for "fetch".
3.See call to undefined local function symbol.
  
Actual results:
An object that can't be linked.

Expected results:
Correct code.

Additional info:
file attached

Comment 1 Roland McGrath 2008-06-11 22:19:56 UTC
Created attachment 309006 [details]
test case preprocessed C source

Comment 2 Jakub Jelinek 2008-06-12 12:34:22 UTC
This has nothing to do with -fprofile-arcs or -ftest-coverage, everything to do
with -O0 -std=gnu99.  Small testcase:
int main (void)
{
  int i = 2;
  inline int bar (void)
  {
    return i;
  }
  return bar () - 2;
}
which works with -O0 -std=gnu99 -fgnu89-inline, or -O1 -std=gnu99, or -O0
-std=gnu89, but doesn't work with -O0 -std=gnu99.  inline without extern in
the misdesigned ISO C99 semantics means that external definition is not
provided.  Though, talking about external definitions for nested functions is
weird and extern inline int bar (void) { return i; } as nested function is
diagnosed as error.

Comment 3 Jakub Jelinek 2008-06-12 13:04:08 UTC
Tracking upstream.


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