The -f(no-)inline-functions option does not work. Its documented
effect is controlled by -f(no-)inline, both in gcc and g++.
(Don't ask me how that jibes with Bug #27881:-)
The doc says -finline-functions is only invoked by -O3. I suggest
you preserve -O's current functionality: Move -finline-functions
from -O3 to -O and document that (under -fno-inline-functions).
The two first compile commands below work with gcc-3.4.4, but the
third does not:
-fno-inline -finline-functions
does not inline foo().
That's possibly a doc bug: (gcc)Optimize Options says
`-fno-inline'
Don't pay attention to the `inline' keyword. Normally this option
is used to keep the compiler from expanding any functions inline.
(...)
One of these sentences is wrong. Does -fno-inline only mean "ignore
the inline keyword", or does it mean "inline nothing, regardless of
other inlining options or keywords/attributes", or something else?
Doc bugs in Info node (gcc)Inline:
"(If you are writing a header file to be included in ISO C programs,
write `__inline__' instead of `inline'...")
Should now be "ISO C90" programs.
"Some calls cannot be integrated for various reasons (in particular,
calls that precede the function's definition cannot be integrated,..."
Except with -funit-at-a-time. Which is also turned on by -O even though
it's documented as an -O2 option.
$ cat bug.c
static int foo(void) { return 9; }
int bar(void) { return foo(); }
$ gcc -O -fno-inline-functions -S bug.c -o-
.file "bug.c"
.text
.globl bar
.type bar, @function
bar:
pushl %ebp
movl %esp, %ebp
movl $9, %eax
popl %ebp
ret
.size bar, .-bar
.ident "GCC: (GNU) 4.1.1"
.section .note.GNU-stack,"",@progbits
$ gcc -O -fno-inline -S bug.c -o-
.file "bug.c"
.text
.type foo, @function
foo:
pushl %ebp
movl %esp, %ebp
movl $9, %eax
popl %ebp
ret
.size foo, .-foo
.globl bar
.type bar, @function
bar:
pushl %ebp
movl %esp, %ebp
call foo
popl %ebp
ret
.size bar, .-bar
.ident "GCC: (GNU) 4.1.1"
.section .note.GNU-stack,"",@progbits
$ gcc -O -fno-inline -finline-functions -S bug.c -o-
<same output as from -O -fno-inline>
--
Summary: -fno-inline-functions does not work, and doc bugs
Product: gcc
Version: 4.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: h dot b dot furuseth at usit dot uio dot no
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30240
