gnu.gcc.help Google Group

LTO : how to specify number of chunks with option -flto-partition=balanced

swati....@gmail.com (Swati Rathi) — Wed, 15 May 2013 12:04:49 UT

-flto-partition=balanced is used to specify partitioning into equally sized chunks.
Is there an option to specify size or number of chunks?

enabling "set but unused" warning

kenak...@gmail.com — Sun, 14 Apr 2013 23:35:39 UT

I've seen numerous posts regarding disabling the "set but unused" warning message. I'm having the opposite problem; I can't get this warning to occur. Given the simple program

/* test.C */
int main() {

int x;
x = 1;
printf("hi\n");

return 0;

Compiling this with g++ 4.4.0 (the latest we have installed for official builds) and using 'Wall -Wextra' I get no compiler warning about the 'x = 1'. I even specified '-Wunused' but still no warning. I need this warning to preempt warnigns generatied by our code analysis program (Coverity).

gcc plug-able debug format generator?

mcheun...@gmail.com — Mon, 08 Apr 2013 17:04:59 UT

Hi All
Does gcc support some kind of plug-able debug format generator? if i want to make gcc to generate my own debug file format, is it possible? which way i can do it more easily?

thanks
from Peter (cmk...@hotmail.com)

Using lambda - link error

dfleu...@free.fr (David FLEURY) — Sun, 10 Mar 2013 21:15:17 UT

Hi,
I try to use lambda to replace static function to call some callbacks.

Depending on what optimization args used, I got link error. Work fine
only for -O2 (not without optim flag nor -O only)

Does anybody now what I am doing wrong ?

//[CODE]

class Widget;

typedef void (Fl_Callback)(Widget*, void*);

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How to I deference symbolic links when linking?

requi...@no_mail.xxx (NoName) — Mon, 04 Mar 2013 00:00:37 UT

I might be in the wrong ng; if so, please direct me accordingly.

My question is this: suppose I have a library a_lib.so.1.1, with the
symlinks a_lib.so.1 pointing to it, and a_lib.so pointing to a_lib.so.1,
just as they ought to be. I am compiling a program which compiles against
a_lib.so. How do I get the linker to link with a_lib.so.1.1 instead?

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C:\cygwin>gcc -c Musatov.CSharp.S -c Musatov.CSharp.cs

marty.musa...@gmail.com (Martin Musatov) — Wed, 06 Feb 2013 13:03:14 UT

C:\cygwin>gcc -c Musatov.CSharp.S -c Musatov.CSharp.cs
The contents of the "desc:" lines are printed out at the top of the
summary. This is a generic way of providing simulation specific
information, e.g. for givingMore than one line of info can be
presented for each file/fn/line number. In sucCounts can be "." to

Any ideas of how to make use of this file

marty.musa...@gmail.com (Martin Musatov) — Wed, 06 Feb 2013 13:01:46 UT

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[getaddrinfo] Mudflap violation reason

m.labanow...@gmail.com (Maciej Labanowicz) — Fri, 25 Jan 2013 12:53:53 UT

Hi,

I have simple code that invokes mudflap violation:

$ gawk '{printf("%02u: %s\n", NR, $0);}' test.c
01: #include <stdio.h>
02: #include <stdlib.h>
03: #include <sys/types.h>
04: #include <sys/socket.h>
05: #include <netdb.h>
06: int main(void) {
07: struct addrinfo * info = NULL;
08: if (!getaddrinfo("127.0.0.1", "tftp", NULL, &info)) {

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Types table size and format in the .gcc_exception_table

alam_sha...@yahoo.com — Fri, 04 Jan 2013 14:44:50 UT

As part of my research I am updating the .gcc_exception_table of a binary 64 bit elf file. For small C++ programs that throw exceptions it works OK, but for large benchmark programs it's not working. My question is does GCC stores more than one table inside the .gcc_exception_table section of the elf file. If it does what's the exact format of these tables. I have some knowledge of the action table, action records and types table. I am not clear about the size of the types table.

ARM processor

b...@coolfone.comze.com — Thu, 20 Dec 2012 15:32:28 UT

Anyone know how I can tell GCC to compile something for an ARM processor?

I'm trying to get nano/pico working on Android.

RTL translation functionality?

russell.pott...@gmail.com (Russell Potter) — Tue, 18 Dec 2012 11:46:05 UT

Does anyone know if there exists anywhere a
(preferably callable from C) library containing
the type of functionality GCC provides in
configurably translating from an intermediate
language such as RTL to various (or, in GCC's
case, pretty much all :-) processor assembly
languages and, if so, could that that person

traidional output format

mcheun...@gmail.com — Mon, 12 Nov 2012 10:07:17 UT

Hi all
when i make the qemu, i got the following output, i want to see what parameter is passed to gcc and ld, how can i switch makefile to traditional console output format?
thanks

make all
GEN config-host.h
GEN trace.h
GEN qemu-options.def
GEN qmp-commands.h
GEN qapi-types.h

kvm programming example

mcheun...@gmail.com — Sun, 11 Nov 2012 03:03:23 UT

Dear All
Do you have a working example for kvm programming? The examples from google cannot be compile in Fedora 17.
thanks
from Peter (cmk...@hotmail.com)

libelf --target

mcheun...@gmail.com — Fri, 09 Nov 2012 04:24:30 UT

Hi All
libelf --target has no effect when ./configure.
thanks
from Peter

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troubles with gcc optimization for unused labels

riccardomanf...@gmail.com (InuY4sha) — Tue, 30 Oct 2012 10:36:35 UT

I'm trying to use the address of a label in my code:

void my_foo_func(){
save_address_for_lager(&&foo_l abel);
do_stuff();
foo_label:
return;

But when I optimize (e.g. -Os), the resulting address is wrong and forces the code to get back to an erlier point in my_foo_func.

I know it has to do with unused labels and that this is not part of GNU C practises and not portable and stuff.

Machine independent assembler? RTL?

ole-usenet-s...@gmx.net (Olе Streicher) — Wed, 24 Oct 2012 14:37:53 UT

Hi,

I am working on the packaging pf the astronomical software "IRAF"
<[link]>. One of the problems there is that they need
small piece of assembler code for each supported platform that basically
provides the "setjmp" call for Fortran, i.e., trailing underscore,
/# call by reference, and no function returns. This requires an

libelf 0.8.9 --target takes no effect

mcheun...@gmail.com — Mon, 15 Oct 2012 05:02:05 UT

Hi All
libelf 0.8.9 --target=something takes no effect for ./configure , is it a bug?
thanks
from Peter (cmk...@hotmail.com)

CROSS COMPILATION

anubhav.nitsri...@gmail.com (CODENAME FREAK) — Thu, 11 Oct 2012 00:21:51 UT

Greetings,
I am working to port OS to ARM arch. and have to build a cross compiler for the same,I am using UBUNTU 12.04,and its not ubuntu that I am porting to arm.In addition with GCC cross compiler I will use qemu to test the code.
Will it work..?

gcc 4.7 newbie build questions

c...@invalid.net (compilerking) — Wed, 10 Oct 2012 20:50:45 UT

Hello,
I am going to try building gcc 4.7 from source again. My first attempt
failed so I am starting from scratch. The question I have concerns the
build directory structure.

I have read the installation instructions which are very detailed. This
would be the most complex source build I have ever done if I pull it off

Is GCC a parallel compiler for mult-core CPUs in Linux?

lordwilliams1...@gmail.com (K.J. Williams) — Wed, 03 Oct 2012 01:07:16 UT

Hello,

I found a website for a compiler called PGI CUDA-x86, it is defined as a parallel compiler for multi-core x86 and I wanted to know if GCC could be called parallel compiler in the same manner that this other compiler is designed for, see :

[link]

Anyways does GCC offer parallel compiling for multi-core x86 CPUs and is it a popular practice in Linux especially utilizing X11R4 (or X11R5 ?) ?

include paths missing

dev-n...@shared-files.de (Torsten Mueller) — Wed, 26 Sep 2012 18:10:30 UT

I have an interesting question. I specify -I. and -I../.. during the g++
invocation. But the compiler doesn't know these paths. Why?

Look at this example:

$ g++ -v -I. -I../.. -c config.cc

The -v makes gcc dump the following list before compilation:

[...]
#include "..." search starts here:

linker script trouble

mcheun...@gmail.com — Fri, 21 Sep 2012 15:43:53 UT

Hi All
Why these not working:

.all_text : { *(.text) }
.all_data : { *(.data) }
.all_bss : { *(.bss) }
.all_rodata : { *(.rodata) }

but these working?

.kernel_text : { *(.text) }
.kernel_data : { kernel.o(.data) }
.kernel_bss : { kernel.o(.bss) }

Dynamic linking with undefined symbol giving runtime error

aun...@gmail.com — Thu, 20 Sep 2012 19:41:52 UT

I am trying to use a lib(mongodb C driver) in my application but stuck badly in a linking problem. The libs are 4 objects (libbson.a + libbson.so + libmongoc.a + libmongoc.so). My Makefile has libraries added like this. The relevant ones are -lmongoc and -lbson

srv_la_LIBADD = -lrt -lcre2 -lre2 -lcurl -lpthread -lmongoc \

Optimized gcc function calling assembler.

dpi...@cozx.com (Dave Pitts) — Fri, 07 Sep 2012 15:34:49 UT

Hello:

I've been working with a third party supplied assembler function that seems to
have issues when being called from optimized gcc code. I get spurious values in
calling function. It appears that the assembler function is using registers that
the gcc code is expecting to not change. Is there a way, in gcc, to protect

"jal" to the middle of another function's body in MIPS binary compiled with GCC, what can be the original C code?

overk...@gmail.com (Михаил Сычёв) — Sun, 02 Sep 2012 10:08:30 UT

Hi,

I am reverse engineering a playstation 1 binary written in C and compiled with a very old version of gcc(year 1997-1999, 2.9+). I spotted a very strange JAL instruction that leads to the middle of another function. I've checked that no code is being loaded or modified at runtime and this jump makes some sense. (The "callee" is a LZ77 decompress function which allocates memory for decompressed data and then decode data and "caller" uses static memory buffer and jumps to the middle of the function to pass the unneeded allocation.

What about C implementation of GCC after cxx-conversion

lovecreatesbea...@gmail.com — Mon, 27 Aug 2012 02:41:35 UT

Will GCC still be officially maintained in C (along side with C++) under GNU?

Or the C implementaion version just dropped or what?

What is the correct x86_64 %rsi mode?

dpi...@cozx.com (Dave Pitts) — Wed, 15 Aug 2012 15:19:32 UT

Hello:

I've got an inline assembler stanza that is attempting to use the "crc32q"
instruction. The stanza is:

__asm__ __volatile__( "crc32q\t%2, %0"
:"=S"(crc) :"0"(crc), "c"(*wp));

The mode "=S" generates %esi for argument 0. What do I have to do to get it to
generate %rsi?

gcc do not find the library

sigmundskjel...@gmail.com (Sigmund Skjelnes) — Sun, 12 Aug 2012 14:15:11 UT

Tried to compile this little program:
/* sqrt-number.c */

int main( int argc, char **argv ){

double f = 9.0;
printf("Kvadratroten av %f er %f\n", f, sqrt(f) );

Got this result:
sigmund@sigmund-desktop:~/csrc $ gcc -lm -o sqrt-number sqrt-number.c
/tmp/ccb750CF.o: In function `main':

Suspicious assembly code generated by GCC 4.5.2

elgar...@gmail.com (el) — Tue, 31 Jul 2012 08:42:19 UT

Hi,

I'm working on a MIPS-based embedded system.
Below is an assembly code snippet of the end of some function.
This code was compiled by gcc 4.5.2 with -mips16e and -Os flags.
- Line 6: the stack frame is released and ra,s0 and s1 registers are restored from the stack.
- Line 8: returns to the caller function (jump to the return address)

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how does gcc inline the 'memcpy'

nan.l...@gmail.com (absurd) — Thu, 12 Jul 2012 15:27:28 UT

Hello,

I have the following simple code.

int main()
{
char dst[50];
char src[50];
memcpy(dst, src, 50);
return dst[1];

When I use gcc to compile it without any optimization, I can see a function call to memcpy is in the executable (with objdump). With optimization, the memcpy seems to be inlined.

Difficulty building gcc form source

pb.some...@gmail.com (Philip B) — Tue, 10 Jul 2012 21:03:24 UT

I am trying to build gcc from source on a FreeBSD 8.1 system. The existing gcc is 3.4.6.

My steps are as follows, starting from the untarred gcc-4.2.2 directory.
I get the following error:

checking whether /usr/src/local/gcc-4.2.2/host- i386-unknown-freebsd8.1/gcc/gf ortran -B/usr/src/local/gcc-4.2.2/hos t-i386-unknown-freebsd8.1/gcc/ -B/usr/local/i386-unknown-free bsd8.1/bin/ -B/usr/local/i386-unknown-free bsd8.1/lib/ -isystem /usr/local/i386-unknown-freebs d8.1/include -isystem /usr/local/i386-unknown-freebs d8.1/sys-include accepts -g... no

How ld decides offset for relocation type MIPS GPREL16?

jig...@gmail.com (Qinglai Xiao) — Fri, 06 Jul 2012 05:41:06 UT

Hi,

I'm writing a runtime linker for MIPS32 arch, and have problems with
GPREL16 relocation type.
For instance, the compiler/assembler outputs a relocatable object with
an instruction as below :

ff838018 sd v1,-32744(gp)

The symbol involved here belongs to .sbss section, and is set to

Linux readelf command has bug?

cmk...@hotmail.com (Peter) — Tue, 19 Jun 2012 17:00:48 UT

Hi All
Linux readelf command has bug?
[link]

thanks
from Peter (cmk...@hotmail.com

Why the sizeof is 4 for this case?

pan...@gmail.com (Hill Pang) — Tue, 12 Jun 2012 05:08:53 UT

Here is my code:

struct f1 {
int x; int y[];

void main()
{
printf("sizeof %d\n", sizeof f1);

The output(by GCC) is 4.
My question is why it doesn't count the size of the flexible array while it is static initialized?
In other words, if I want to know the *really* size of f1, how to do it? is it possible?

cygwin +g95

amandabell7...@gmail.com — Tue, 29 May 2012 03:04:33 UT

I was given a CD with fortran files as part of my senior year project
(biology major), that said in order to compile the code (using
cygwin), to install 'cygwin' and 'g95' Fortran compiler. I think i got
the 'cygwin' succesfully installed (after watching numerous youtube
videos) on my Windows Vista (added it to 'path' variable in