Use of glibc_version_header in project not effective

[hardtwell]

I'm not sure what I need to do, or, what I'm failing to understand ...

1. Platforms:
   Development
   x86_64
   CentOS Linux 2.6.32-358.el6.x86_64
   gcc 4.4.7
   Target:
   x86_64
   Oracle Linux 2.6.39-400.294.3.el5uek

2. curl-7.61.0 built on development platform fails to run on target
   platform:
   ./curl: /lib64/libc.so.6: version `GLIBC_2.7' not found (required by ./curl)

3. Tried simple project with Makefile entries ...

   SHELL = /bin/sh
   CC = gcc -static-libgcc
   CFLAGS = -include /home/geek2/dev/proofs/glibcVerHdr/force_link_glibc_2.6.h
   LDFLAGS = -Wl,-v

   (and with other versions of force_link_glibc_2.*.h), but, the executable
   continues to fail like curl.

[wheybags]

Curl probably links to other dependencies which were not compiled with this (eg libssl)

[hardtwell]

Right, before I rebuild openssl and curl I wanted to successfully build a simple executable with which to confirm correct usage of a glibc_version_header header file. So, I assumed that "...'GLIBC_2.7' not found ..." (due to, say, an sscanf (2.7) versioned symbol) might be resolved by including the force_link_glibc_2.6.h header, but, haven't had success yet; i.e., my test executable won't run on the target platform regardless of the force_link_glibc_x.y.h header I include. So, it seems clear I'm missing something ... maybe a lot.

BTW, the previously cited Makefile builds a simple program ...
int main(int argc, char* argv[]) {
char str[32] = "a b c"; char c1 = ' '; char c2 = ' '; char c3 = ' ';
sscanf(str, "%c %c %c", &c1, &c2, &c3);
printf("main: sscanf: %c %c %c\n", c1, c2, c3);
}

[hardtwell]

Didn't mean to close this thread.

[dsnezhkov]

Hi,

I am running into the same issue. Freshly built on :
host: Debian 9 testing x86_64

native glibc:
ldd --version

ldd (Debian GLIBC 2.27-6) 2.27

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

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

    pause();
    return 0;
}

gcc -Wall -static-libgcc -include /root/Code/z/ext/glibc_version_header/version_headers/force_link_glibc_2.17.h /root/Code/z/src/main.c -o /root/Code/z/bin/main

nm main

                 w __cxa_finalize@@GLIBC_2.2.5
                 U __libc_start_main@@GLIBC_2.2.5
                 U pause@@GLIBC_2.2.5

What am I doing wrong? Thanks