c11-atomic-exec-5: Avoid dead code where LDBL_MANT_DIG is 106

Hi,

 Commit 216437 missed a part of Adhemerval's original change that made 
`long_double_add_overflow', `complex_long_double_add_overflow', 
`long_double_sub_overflow' and `complex_long_double_sub_overflow' tests 
consistently defined only if called.  These tests are now only made under 
the `LDBL_MANT_DIG != 106' condition, otherwise there is no need to 
provide definitions that become dead code.

 Here's the missing part, I have verified the source still builds after 
the change manually with:

$ gcc -U__LDBL_MANT_DIG__ -D__LDBL_MANT_DIG__=113 -Wunused-function -std=c11 -pedantic-errors -pthread -D_POSIX_C_SOURCE=200809L -lm -latomic -o c11-atomic-exec-5 c11-atomic-exec-5.c

and:

$ gcc -U__LDBL_MANT_DIG__ -D__LDBL_MANT_DIG__=106 -Wunused-function -std=c11 -pedantic-errors -pthread -D_POSIX_C_SOURCE=200809L -lm -latomic -o c11-atomic-exec-5 c11-atomic-exec-5.c

It also passed regression testing with the powerpc-gnu-linux target and my 
usual multilibs that have LDBL_MANT_DIG set to 106, which is the only case 
this change really affects.

 Without this change I get this instead:

$ gcc -U__LDBL_MANT_DIG__ -D__LDBL_MANT_DIG__=113 -Wunused-function -std=c11 -pedantic-errors -pthread -D_POSIX_C_SOURCE=200809L -lm -latomic -o c11-atomic-exec-5 c11-atomic-exec-5.c
$

(OK), and:

$ gcc -U__LDBL_MANT_DIG__ -D__LDBL_MANT_DIG__=106 -Wunused-function -std=c11 -pedantic-errors -pthread -D_POSIX_C_SOURCE=200809L -lm -latomic -o c11-atomic-exec-5 c11-atomic-exec-5.c
c11-atomic-exec-5.c:62:1: warning: 'test_main_long_double_add_overflow' definedbut not used [-Wunused-function]
 test_main_##NAME (void)       \
 ^
c11-atomic-exec-5.c:334:1: note: in expansion of macro 'TEST_FUNCS'
 TEST_FUNCS (long_double_add_overflow, long double, , += LDBL_MAX, 0,
 ^
c11-atomic-exec-5.c:62:1: warning: 'test_main_complex_long_double_add_overflow'defined but not used [-Wunused-function]
 test_main_##NAME (void)       \
 ^
c11-atomic-exec-5.c:352:1: note: in expansion of macro 'TEST_FUNCS'
 TEST_FUNCS (complex_long_double_add_overflow, _Complex long double, , += LDBL_MAX, 0,
 ^
c11-atomic-exec-5.c:62:1: warning: 'test_main_long_double_sub_overflow' definedbut not used [-Wunused-function]
 test_main_##NAME (void)       \
 ^
c11-atomic-exec-5.c:358:1: note: in expansion of macro 'TEST_FUNCS'
 TEST_FUNCS (long_double_sub_overflow, long double, , -= LDBL_MAX, 0,
 ^
c11-atomic-exec-5.c:62:1: warning: 'test_main_complex_long_double_sub_overflow'defined but not used [-Wunused-function]
 test_main_##NAME (void)       \
 ^
c11-atomic-exec-5.c:376:1: note: in expansion of macro 'TEST_FUNCS'
 TEST_FUNCS (complex_long_double_sub_overflow, _Complex long double, , -= LDBL_MAX, 0,
 ^
$

(not quite so).

 This also wraps the definitions of the `NOT_LDBL_EPSILON_2' and 
`NOT_MINUS_LDBL_EPSILON_2' macros into this condition, but these aren't 
referred to if `LDBL_MANT_DIG' is 106 either.

 No changes compared to original code so all credit goes to Adhemerval.  
OK to apply?

2014-10-24  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>

	gcc/testsuite/
	* gcc.dg/atomic/c11-atomic-exec-5.c 
	(test_main_long_double_add_overflow): Only actually define if
	LDBL_MANT_DIG != 106.
	(test_main_complex_long_double_add_overflow): Likewise.
	(test_main_long_double_sub_overflow): Likewise.
	(test_main_complex_long_double_sub_overflow): Likewise.

	(NOT_LDBL_EPSILON_2): Likewise.
	(NOT_MINUS_LDBL_EPSILON_2): Likewise.

  Maciej

gcc-r216437-azanella-rs6000-atomic-assign-expand-env-update.diff

Hi,

 This patch:

http://gcc.gnu.org/ml/gcc-patches/2014-10/msg02540.html

is still waiting, please review.

 Thanks,

  Maciej

On Fri, 14 Nov 2014, Maciej W. Rozycki wrote:

> Hi,
> 
>  This patch:
> 
> http://gcc.gnu.org/ml/gcc-patches/2014-10/msg02540.html
> 
> is still waiting, please review.

OK.

On Fri, 14 Nov 2014, Joseph Myers wrote:

> OK.

 Applied, thanks.

  Maciej