[Bug 1857099] [NEW] strerror_r used as non-portable format

[Luiz Angelo Daros de Luca]

Public bug reported:

I got a elfutils-0.178

glibc provides two different signatures for strerror_r. One is GNU-specific and it is not portable.
The other is 

       int strerror_r(int errnum, char *buf, size_t buflen);
                   /* XSI-compliant */

       char *strerror_r(int errnum, char *buf, size_t buflen);
                   /* GNU-specific */

man strerror(3) says:

       The XSI-compliant strerror_r() is preferred for portable
applications.  It returns the error string in the user-supplied buffer
buf of length buflen.

musl implements strerror_r as XSI-compliant version while elfutils uses
GNU-specific variant.

The solution should not simply ignore strerror_r return value as it
would break build when -Werror=unused-result is set.

An alternative is to do something like:
https://github.com/luizluca/openwrt/blob/a79698fefdd9dacb84865c870bf75aee978c005d/package/libs/elfutils/patches/100
-musl-compat.patch#L51

** Affects: elfutils (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1857099

Title:
  strerror_r used as non-portable format

Status in elfutils package in Ubuntu:
  New

Bug description:
  I got a elfutils-0.178

  glibc provides two different signatures for strerror_r. One is GNU-specific and it is not portable.
  The other is 

         int strerror_r(int errnum, char *buf, size_t buflen);
                     /* XSI-compliant */

         char *strerror_r(int errnum, char *buf, size_t buflen);
                     /* GNU-specific */

  man strerror(3) says:

         The XSI-compliant strerror_r() is preferred for portable
  applications.  It returns the error string in the user-supplied buffer
  buf of length buflen.

  musl implements strerror_r as XSI-compliant version while elfutils
  uses GNU-specific variant.

  The solution should not simply ignore strerror_r return value as it
  would break build when -Werror=unused-result is set.

  An alternative is to do something like:
  https://github.com/luizluca/openwrt/blob/a79698fefdd9dacb84865c870bf75aee978c005d/package/libs/elfutils/patches/100
  -musl-compat.patch#L51

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