How to compile my own standard glibc C library from source code and use it?

Question

How to compile my own standard glibc C library from source code and use it?

I am trying to compile my own glibc. I have a directory glibcthat contains the source code glibcthat I downloaded from the Internet. From this directory I typed mkdir ../build-glibc. Now from the directory build-glibcI typed ../glibc/configure, which performed the configuration. Now I'm not sure how to call make. I cannot call it from a directory glibc, because it does not have a configuration set, and I cannot call it from build-glibc, since the makefile is not in this directory. How to solve this problem?

+9

c gcc linux x86-64 glibc

pythonic May 02 '12 at 11:19

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2 answers

Setting 1: Glibc without dedicated GCC

This setting can work quickly, as it does not recompile the entire GCC toolkit, only glibc.

, C, crt1.o, crti.o crtn.o glibc. : https://sourceware.org/glibc/wiki/Testing/Builds?action=recall&rev=21#Compile_against_glibc_in_an_installed_location. , glibc, , - .

. 2 .

glibc :

export glibc_install="$(pwd)/glibc/build/install"

git clone git://sourceware.org/git/glibc.git
cd glibc
git checkout glibc-2.28
mkdir build
cd build
../configure --prefix "$glibc_install"
make -j 'nproc'
make install -j 'nproc'

1:

test_glibc.c

#define _GNU_SOURCE
#include <assert.h>
#include <gnu/libc-version.h>
#include <stdatomic.h>
#include <stdio.h>
#include <threads.h>

atomic_int acnt;
int cnt;

int f(void* thr_data) {
    for(int n = 0; n < 1000; ++n) {
        ++cnt;
        ++acnt;
    }
    return 0;
}

int main(int argc, char **argv) {
    /* Basic library version check. */
    printf("gnu_get_libc_version() = %s\n", gnu_get_libc_version());

    /* Exercise thrd_create from -pthread,
     * which is not present in glibc 2.27 in Ubuntu 18.04.
     * https://stackoverflow.com/questions/56810/how-do-i-start-threads-in-plain-c/52453291#52453291 */
    thrd_t thr[10];
    for(int n = 0; n < 10; ++n)
        thrd_create(&thr[n], f, NULL);
    for(int n = 0; n < 10; ++n)
        thrd_join(thr[n], NULL);
    printf("The atomic counter is %u\n", acnt);
    printf("The non-atomic counter is %u\n", cnt);
}

test_glibc.sh:

#!/usr/bin/env bash
set -eux
gcc \
  -L "${glibc_install}/lib" \
  -I "${glibc_install}/include" \
  -Wl,--rpath="${glibc_install}/lib" \
  -Wl,--dynamic-linker="${glibc_install}/lib/ld-linux-x86-64.so.2" \
  -std=c11 \
  -o test_glibc.out \
  -v \
  test_glibc.c \
  -pthread \
;
ldd ./test_glibc.out
./test_glibc.out

:

gnu_get_libc_version() = 2.28
The atomic counter is 10000
The non-atomic counter is 8674

https://sourceware.org/glibc/wiki/Testing/Builds?action=recall&rev=21#Compile_against_glibc_in_an_installed_location, --sysroot:

cannot find /home/ciro/glibc/build/install/lib/libc.so.6 inside /home/ciro/glibc/build/install

.

ldd , ldd , , :

+ ldd test_glibc.out
        linux-vdso.so.1 (0x00007ffe4bfd3000)
        libpthread.so.0 => /home/ciro/glibc/build/install/lib/libpthread.so.0 (0x00007fc12ed92000)
        libc.so.6 => /home/ciro/glibc/build/install/lib/libc.so.6 (0x00007fc12e9dc000)
        /home/ciro/glibc/build/install/lib/ld-linux-x86-64.so.2 => /lib64/ld-linux-x86-64.so.2 (0x00007fc12f1b3000)

gcc , , , , , , , :

COLLECT_GCC_OPTIONS=/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/crt1.o

1: glibc

glibc:

diff --git a/nptl/thrd_create.c b/nptl/thrd_create.c
index 113ba0d93e..b00f088abb 100644
--- a/nptl/thrd_create.c
+++ b/nptl/thrd_create.c
@@ -16,11 +16,14 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */

+#include <stdio.h>
+
 #include "thrd_priv.h"

 int
 thrd_create (thrd_t *thr, thrd_start_t func, void *arg)
 {
+  puts("hacked");
   _Static_assert (sizeof (thr) == sizeof (pthread_t),
                   "sizeof (thr) != sizeof (pthread_t)");

glibc, :

cd glibc/build
make -j 'nproc'
make -j 'nproc' install
./test_glibc.sh

hacked , .

, glibc, .

Ubuntu 18.04.

2: crosstool-NG

1, , : , , C, crt1.o, crti.o crtn.o,

GCC, glibc, .

, . - .

crosstool-NG - , , GCC, glibc binutils.

, GCC , .

, crosstool-NG -Wl -Wl, , GCC. , , , .

crosstool-NG, :

git clone https://github.com/crosstool-ng/crosstool-ng
cd crosstool-ng
git checkout a6580b8e8b55345a5a342b5bd96e42c83e640ac5
export CT_PREFIX="$(pwd)/.build/install"
export PATH="/usr/lib/ccache:${PATH}"
./bootstrap
./configure --enable-local
make -j 'nproc'
./ct-ng x86_64-unknown-linux-gnu
./ct-ng menuconfig
env -u LD_LIBRARY_PATH time ./ct-ng build CT_JOBS='nproc'

.

, , - . :

uname -a

:

4.15.0-34-generic

menuconfig :

Operating System
- Version of linux

:

4.14.71

. , .

2:

.config ./ct-ng x86_64-unknown-linux-gnu :

CT_GLIBC_V_2_27=y

, menuconfig :

C-library
Version of glibc

.config .

, glibc, , glibc git, :

Paths and misc options
- Try features marked as EXPERIMENTAL: true
C-library
- Source of glibc
  - Custom location:
  - Custom location
    - Custom source location: , glibc

glibc :

git clone git://sourceware.org/git/glibc.git
cd glibc
git checkout glibc-2.28

2:

, :

#!/usr/bin/env bash
set -eux
install_dir="${CT_PREFIX}/x86_64-unknown-linux-gnu"
PATH="${PATH}:${install_dir}/bin" \
  x86_64-unknown-linux-gnu-gcc \
  -Wl,--dynamic-linker="${install_dir}/x86_64-unknown-linux-gnu/sysroot/lib/ld-linux-x86-64.so.2" \
  -Wl,--rpath="${install_dir}/x86_64-unknown-linux-gnu/sysroot/lib" \
  -v \
  -o test_glibc.out \
  test_glibc.c \
  -pthread \
;
ldd test_glibc.out
./test_glibc.out

, 1, , :

COLLECT_GCC_OPTIONS=/home/ciro/crosstool-ng/.build/install/x86_64-unknown-linux-gnu/bin/../x86_64-unknown-linux-gnu/sysroot/usr/lib/../lib64/crt1.o

2: glibc

Crosstool-NG, .

;

env -u LD_LIBRARY_PATH time ./ct-ng build CT_JOBS='nproc'

glibc , , .

:

./ct-ng list-steps

:

Available build steps, in order:
  - companion_tools_for_build
  - companion_libs_for_build
  - binutils_for_build
  - companion_tools_for_host
  - companion_libs_for_host
  - binutils_for_host
  - cc_core_pass_1
  - kernel_headers
  - libc_start_files
  - cc_core_pass_2
  - libc
  - cc_for_build
  - cc_for_host
  - libc_post_cc
  - companion_libs_for_target
  - binutils_for_target
  - debug
  - test_suite
  - finish
Use "<step>" as action to execute only that step.
Use "+<step>" as action to execute up to that step.
Use "<step>+" as action to execute from that step onward.

, glibc, GCC, libc_start_files cc_core_pass_2, , , cc_core_pass_1.

, " " .config :

Paths and misc options
- Debug crosstool-NG
  - Save intermediate steps

:

env -u LD_LIBRARY_PATH time ./ct-ng libc+ -j'nproc'

, , + , : https://github.com/crosstool-ng/crosstool-ng/issues/1033#issuecomment-424877536

, , . .. libc, , libc (, , , libstdc++).

, , , , crosstool-NG.

, libc, , Custom source location, .

: stdlibc++

, C++: GCC libstdc++ C++?

+5

Ciro Santilli 新疆改造中心六四事件法轮功 22 . '18 8:00

Arjunshankar · Accepted Answer · 2012-05-02T11:36:20+0000

Makefilewill exist in your directory build-glibcif the configurescript succeeds .

If configureeverything went smoothly during , but not yet Makefile, then you probably missed idiosyncrasy:

When executed configurefor glibc, you are expected to usually provide an alternative --prefix, because setting to the default location ( /usr/local) can potentially damage the system. If you did not provide it, you need to enable it --disable-sanity-checks.

If not, find the file config.logand read its contents.

How to compile my own standard glibc C library from source code and use it?

Setting 1: Glibc without dedicated GCC

1:

1: glibc

2: crosstool-NG

2:

2:

2: glibc

: stdlibc++

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