https://sourceware.org/bugzilla/show_bug.cgi?id=28882
Bug ID: 28882
Summary: build failure in readelf.c with gcc-4.2 due to use of
0b literals
Product: binutils
Version: 2.38
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: mikpelinux at gmail dot com
Target Milestone: ---
Attempting to build binutils-2.38 with gcc-4.2 or older fails with:
/tmp/binutils-2.38/binutils/readelf.c:4239:37: error: invalid suffix "b11" on
integer constant
/tmp/binutils-2.38/binutils/readelf.c:4239:37: error: invalid suffix "b11" on
integer constant
/tmp/binutils-2.38/binutils/readelf.c:4241:43: error: invalid suffix "b11" on
integer constant
/tmp/binutils-2.38/binutils/readelf.c:4241:43: error: invalid suffix "b01" on
integer constant
/tmp/binutils-2.38/binutils/readelf.c:4244:43: error: invalid suffix "b111100"
on integer constant
/tmp/binutils-2.38/binutils/readelf.c:4244:43: error: invalid suffix "b001100"
on integer constant
/tmp/binutils-2.38/binutils/readelf.c:4246:50: error: invalid suffix "b111100"
on integer constant
/tmp/binutils-2.38/binutils/readelf.c:4246:50: error: invalid suffix "b001000"
on integer constant
/tmp/binutils-2.38/binutils/readelf.c:4248:50: error: invalid suffix "b111100"
on integer constant
/tmp/binutils-2.38/binutils/readelf.c:4248:50: error: invalid suffix "b000000"
on integer constant
Building just that file with gcc-11 -std=c17 -Wpedantic shows:
/tmp/binutils-2.38/binutils/readelf.c: In function 'get_machine_flags':
/tmp/binutils-2.38/binutils/readelf.c:4239:27: warning: binary constants are a
C2X feature or GCC extension
4239 | if (EF_LOONGARCH_IS_LP64 (e_flags))
| ^~~~
...
So the issue comes from include/elf/loongarch.h's use of 0b literals which are
a GNU C extension since gcc-4.3 but are not in any ANSI or ISO C standard.
I can work around this issue, but the question is whether GNU binutils wants to
require host compiler support for this non-standard feature or not?
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