FW: checking whether <arm-none-eabi-gcc accepts> -g... <no>

[Kleiber Tamas (BCDS/ENG2)]

Hello again,

 it seems the spam filter at qmail-send program at sourceware.org trashed my e-mail :(

Second try...


Mit freundlichen Grüßen / Best regards

Tamas Kleiber  

BeQIK 


-----Original Message-----
From: Kleiber Tamas (BCDS/ENG2) 
Sent: Thursday, December 04, 2014 1:47 PM
To: 'Sebastian Huber'; 'newlib@sourceware.org'
Subject: RE: FW: checking whether <arm-none-eabi-gcc accepts> -g... <no>

Hello Sebastian,

 I have executed the following test case:

	arm-none-eabi-gcc -mthumb -march=armv7-m -c -g conftest.c >results
	echo Result: \"$?\"

Where conftest.c had the following contents:

	/* confdefs.h */
	#define PACKAGE_NAME "newlib"
	#define PACKAGE_TARNAME "newlib"
	#define PACKAGE_VERSION "2.1.0"
	#define PACKAGE_STRING "newlib 2.1.0"
	#define PACKAGE_BUGREPORT ""
	#define PACKAGE_URL ""
	/* end confdefs.h.  */
	
	int
	main ()
	{
	
	  ;
	  return 0;
	}

The created "results" text file is empty.
The echoed result of \"$?\" is: "0".


The original test case in /newlib-2.1.0/newlib/configure is as follows:

	if test $ac_cv_c_compiler_gnu = yes; then
	  GCC=yes
	  ac_test_CFLAGS="${CFLAGS+set}"
	  ac_save_CFLAGS="$CFLAGS"
	  ac_test_CFLAGS=${CFLAGS+set}
	ac_save_CFLAGS=$CFLAGS
	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC accepts -g" >&5
	$as_echo_n "checking whether $CC accepts -g... " >&6; }
	if ${ac_cv_prog_cc_g+:} false; then :
	  $as_echo_n "(cached) " >&6
	else
	  ac_save_c_werror_flag=$ac_c_werror_flag
	   ac_c_werror_flag=yes
	   ac_cv_prog_cc_g=no
	   CFLAGS="-g"
	   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
	/* end confdefs.h.  */
	
	int
	main ()
	{
	
	  ;
	  return 0;
	}
	_ACEOF
	if ac_fn_c_try_compile "$LINENO"; then :
	  ac_cv_prog_cc_g=yes
	else

The < if test $ac_cv_c_compiler_gnu = yes;> condition on the first line evaluates to true. Then <if ${ac_cv_prog_cc_g+:} false;> enters the else case to perform the actual test.
Based on the log output we could say that conftest.c is properly created by the script. Then comes <if ac_fn_c_try_compile "$LINENO";> which fails.
The $LINENO variable is working as in the log file the line number of configure is always showing up correctly. So my assumption is that ac_fn_c_try_compile() fails.
That subroutine is too complex for me... I will try to debug it via printing out stuff at run time...


The output of configure from /armv7-m/arm-none-eabi/config.log is this:

	configure:3449: checking whether arm-none-eabi-gcc  -mthumb -march=armv7-m accepts -g
	configure:3469: arm-none-eabi-gcc  -mthumb -march=armv7-m -c -g  conftest.c >&5
	configure:3469: $? = 0
	configure: failed program was:
	| /* confdefs.h */
	| #define PACKAGE_NAME "newlib"
	| #define PACKAGE_TARNAME "newlib"
	| #define PACKAGE_VERSION "2.1.0"
	| #define PACKAGE_STRING "newlib 2.1.0"
	| #define PACKAGE_BUGREPORT ""
	| #define PACKAGE_URL ""
	| /* end confdefs.h.  */
	| 
	| int
	| main ()
	| {
	| 
	|   ;
	|   return 0;
	| }



Mit freundlichen Grüßen / Best regards 

Tamas Kleiber

BeQIK 
-----Original Message-----
From: Sebastian Huber [mailto:sebastian.huber@embedded-brains.de] 
Sent: Thursday, December 04, 2014 11:23 AM
To: Kleiber Tamas (BCDS/ENG2); newlib@sourceware.org
Subject: Re: FW: checking whether <arm-none-eabi-gcc accepts> -g... <no>

Hello Tamas,

what is the output if you run the tests manually?

-- 
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone   : +49 89 189 47 41-16
Fax     : +49 89 189 47 41-09
E-Mail  : sebastian.huber@embedded-brains.de
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