Bug 870424 – sys-libs/readline-8.1_p2-r1:0/8[utils] - conftest.c:9:1: error: return type defaults to 'int' [-Werror=implicit-int]

• Product: Gentoo Linux
• Status: CONFIRMED ---

[Description Toralf Förster 2022-09-16 17:58:29 UTC]

cc1: some warnings being treated as errors
CC=cc; CFLAGS=-pipe -march=native -fno-diagnostics-color -O2 -Werror=implicit-function-declaration -Werror=implicit-int; LIBS=;
$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5
configure:3285: error: Can't run the compiler - sorry
configure: error: Can't run the compiler - sorry

## ---------------- ##

  -------------------------------------------------------------------

  This is an unstable amd64 chroot image at a tinderbox (==build bot)
  name: 17.1_desktop_systemd-j4-20220916-160005

  -------------------------------------------------------------------

gcc-config -l:
 [1] x86_64-pc-linux-gnu-12.2.1 *
clang/llvm (if any):
/usr/lib/llvm/14
14.0.6
Python 3.10.6
Available Rust versions:
  [1]   rust-bin-1.63.0 *
php cli (if any):
GNU Make 4.3

  HEAD of ::gentoo
commit 975d806a2a3cb93cc6bc059cdd90d42d84cbe6e1
Author: Repository mirror & CI <[e-mail]>
Date:   Fri Sep 16 15:31:48 2022 +0000

    2022-09-16 15:31:48 UTC

emerge -qpvO sys-libs/readline
[ebuild     U ] sys-libs/readline-8.1_p2-r1 [8.1_p2] USE="(split-usr) (unicode) utils* -static-libs -verify-sig" ABI_X86="(64) -32 (-x32)"

[Comment 1 Toralf Förster 2022-09-16 17:58:30 UTC]

Created attachment 805753 [details]
emerge-info.txt

[Comment 2 Toralf Förster 2022-09-16 17:58:31 UTC]

Created attachment 805756 [details]
emerge-history.txt

[Comment 3 Toralf Förster 2022-09-16 17:58:32 UTC]

Created attachment 805759 [details]
environment

[Comment 4 Toralf Förster 2022-09-16 17:58:33 UTC]

Created attachment 805762 [details]
etc.portage.tar.bz2

[Comment 5 Toralf Förster 2022-09-16 17:58:34 UTC]

Created attachment 805765 [details]
logs.tar.bz2

[Comment 6 Toralf Förster 2022-09-16 17:58:36 UTC]

Created attachment 805768 [details]
sys-libs:readline-8.1_p2-r1:20220916-175415.log

[Comment 7 Sam James 2022-09-17 00:12:23 UTC]

checking for library containing strerror... none required
conftest.c:9:1: error: return type defaults to 'int' [-Werror=implicit-int]
    9 | main(){exit(0);}
      | ^~~~
conftest.c: In function 'main':
conftest.c:9:8: error: implicit declaration of function 'exit' [-Werror=implicit-function-declaration]
    9 | main(){exit(0);}
      |        ^~~~
conftest.c:1:1: note: include '<stdlib.h>' or provide a declaration of 'exit'
  +++ |+#include <stdlib.h>
    1 | /* confdefs.h */
conftest.c:9:8: warning: incompatible implicit declaration of built-in function 'exit' [-Wbuiltin-declaration-mismatch]
    9 | main(){exit(0);}
      |        ^~~~
conftest.c:9:8: note: include '<stdlib.h>' or provide a declaration of 'exit'
cc1: some warnings being treated as errors
CC=cc; CFLAGS=-pipe -march=native -fno-diagnostics-color -O2 -Werror=implicit-function-declaration -Werror=implicit-int; LIBS=;
$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5

[Comment 8 Lukas Schmelting 2022-12-03 21:35:23 UTC]

The newer version (8.2_p1) only has errors about prototypes:
/var/tmp/portage/sys-libs/readline-8.2_p1/work/readline-8.2/text.c:1767:1: error: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]

I have a patch ready for the issues of that version (haven't backported the fix for the error above yet).

[Comment 9 Lukas Schmelting 2022-12-12 18:49:26 UTC]

Please ignore comment 8, I cannot reproduce both the error in that comment (comment 8) and i also cannot reproduce the error stated in the bug title with clang-common-15.0.6[stricter].

[Comment 10 ernsteiswuerfel 2023-08-29 10:55:54 UTC]

Created attachment 868978 [details]
build.log (8.1_p2-r1)

Builds just fine with current clang-16 toolchain.

Probably obsolete?

[Comment 11 Maxim P. Dementiev 2024-04-10 12:45:03 UTC]

I confirm that "-utils" works like a workaround for this c99 bug in readline.
Thanks to  Sam James  in https://bugs.gentoo.org/919256