[PATCH] objtool: Hide unnecessary compiler error message

[PATCH] objtool: Hide unnecessary compiler error message

[David Engraf]

The check for using old libelf prints an error message when libelf.h is
not available but does not abort. This may confuse so hide the compiler
error message.

Signed-off-by: David Engraf <david.engraf@sysgo.com>
---
 tools/objtool/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index f56e277275341..38609e3612ba1 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -37,7 +37,7 @@ OBJTOOL_CFLAGS := -Werror $(WARNINGS) $(KBUILD_HOSTCFLAGS) -g $(INCLUDES) $(LIBE
 OBJTOOL_LDFLAGS := $(LIBELF_LIBS) $(LIBSUBCMD) $(KBUILD_HOSTLDFLAGS)
 
 # Allow old libelf to be used:
-elfshdr := $(shell echo '$(pound)include <libelf.h>' | $(HOSTCC) $(OBJTOOL_CFLAGS) -x c -E - | grep elf_getshdr)
+elfshdr := $(shell echo '$(pound)include <libelf.h>' | $(HOSTCC) $(OBJTOOL_CFLAGS) -x c -E - 2>/dev/null | grep elf_getshdr)
 OBJTOOL_CFLAGS += $(if $(elfshdr),,-DLIBELF_USE_DEPRECATED)
 
 # Always want host compilation.
-- 
2.43.0

Re: [PATCH] objtool: Hide unnecessary compiler error message

[Josh Poimboeuf]

On Mon, Feb 03, 2025 at 08:36:10AM +0100, David Engraf wrote:
> The check for using old libelf prints an error message when libelf.h is
> not available but does not abort. This may confuse so hide the compiler
> error message.
> 
> Signed-off-by: David Engraf <david.engraf@sysgo.com>
> ---
>  tools/objtool/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Queued, thanks!

-- 
Josh

[tip: objtool/core] objtool: Hide unnecessary compiler error message

[tip-bot2 for David Engraf]

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     bf71940fc16953bed84caa59b7b076ead70d42f6
Gitweb:        https://git.kernel.org/tip/bf71940fc16953bed84caa59b7b076ead70d42f6
Author:        David Engraf <david.engraf@sysgo.com>
AuthorDate:    Mon, 03 Feb 2025 08:36:10 +01:00
Committer:     Josh Poimboeuf <jpoimboe@kernel.org>
CommitterDate: Wed, 12 Mar 2025 15:43:38 -07:00

objtool: Hide unnecessary compiler error message

The check for using old libelf prints an error message when libelf.h is
not available but does not abort. This may confuse so hide the compiler
error message.

Signed-off-by: David Engraf <david.engraf@sysgo.com>
Link: https://lore.kernel.org/r/20250203073610.206000-1-david.engraf@sysgo.com
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
 tools/objtool/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index 7a65948..8c20361 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -37,7 +37,7 @@ OBJTOOL_CFLAGS := -Werror $(WARNINGS) $(KBUILD_HOSTCFLAGS) -g $(INCLUDES) $(LIBE
 OBJTOOL_LDFLAGS := $(LIBELF_LIBS) $(LIBSUBCMD) $(KBUILD_HOSTLDFLAGS)
 
 # Allow old libelf to be used:
-elfshdr := $(shell echo '$(pound)include <libelf.h>' | $(HOSTCC) $(OBJTOOL_CFLAGS) -x c -E - | grep elf_getshdr)
+elfshdr := $(shell echo '$(pound)include <libelf.h>' | $(HOSTCC) $(OBJTOOL_CFLAGS) -x c -E - 2>/dev/null | grep elf_getshdr)
 OBJTOOL_CFLAGS += $(if $(elfshdr),,-DLIBELF_USE_DEPRECATED)
 
 # Always want host compilation.