From: Eric Botcazou <ebotcazou@adacore.com>
Date: Fri, 9 Jul 2021 10:08:52 +0000 (+0200)
Subject: Fix build failure on Windows with older binutils
X-Git-Tag: releases/gcc-11.2.0~91
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d9d954ebd507572a460f93f404bba71e271e2dda;p=thirdparty%2Fgcc.git

Fix build failure on Windows with older binutils

This is the build failure on Windows with binutils for which GNU as accepts
the --gdwarf-5 switch but GNU ld generates broken binaries with DWARF 5.

We already have the HAVE_LD_BROKEN_PE_DWARF5 kludge to disable DWARF 5 in
this case but it only tames the DWARF version in the compiler, so the
driver still passes --gdwarf-5 when invoked on an assembly file with -g.

gcc/
	PR target/101377
	* gcc.c (ASM_DEBUG_DWARF_OPTION): Set again to --gdwarf2 in
	the case where HAVE_AS_WORKING_DWARF_N_FLAG is not defined
	and HAVE_LD_BROKEN_PE_DWARF5 is defined.
---

diff --git a/gcc/gcc.c b/gcc/gcc.c
index 7837553958b4..7c75d1314fa8 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -910,7 +910,7 @@ proper position among the other output files.  */
    than in ASM_DEBUG_SPEC, so that it applies to both .s and .c etc.
    compilations.  */
 #  define ASM_DEBUG_DWARF_OPTION ""
-# elif defined(HAVE_AS_GDWARF_5_DEBUG_FLAG)
+# elif defined(HAVE_AS_GDWARF_5_DEBUG_FLAG) && !defined(HAVE_LD_BROKEN_PE_DWARF5)
 #  define ASM_DEBUG_DWARF_OPTION "%{%:dwarf-version-gt(4):--gdwarf-5;" \
 	"%:dwarf-version-gt(3):--gdwarf-4;"				\
 	"%:dwarf-version-gt(2):--gdwarf-3;"				\