* [PATCH] builtins: Guard builtins.cc against HUGE_VAL and NAN definitions
@ 2022-11-02 9:13 Rainer Orth
2022-11-02 9:27 ` Jakub Jelinek
0 siblings, 1 reply; 2+ messages in thread
From: Rainer Orth @ 2022-11-02 9:13 UTC (permalink / raw)
To: gcc-patches; +Cc: Jakub Jelinek
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trunk bootstrap recently broke on Solaris like this:
/vol/gcc/src/hg/master/local/gcc/builtins.cc:2104:8: error: pasting "CFN_BUILT_IN_" and "(" does not give a valid preprocessing token
2104 | case CFN_BUILT_IN_##MATHFN: \
| ^~~~~~~~~~~~~
/vol/gcc/src/hg/master/local/gcc/builtins.cc:2112:3: note: in expansion of macro 'CASE_MATHFN'
2112 | CASE_MATHFN(MATHFN) \
| ^~~~~~~~~~~
/vol/gcc/src/hg/master/local/gcc/builtins.cc:1967:5: note: in expansion of macro 'CASE_MATHFN_FLOATN'
1967 | CASE_MATHFN_FLOATN (HUGE_VAL) \
and similarly for NAN.
It turns out this happens because <math.h> is included at some point,
which (in <iso/math_c99.h>) defines
#define HUGE_VAL (__builtin_huge_val())
#define NAN (__builtin_nanf(""))
While this only happpens on Solaris right now, the same issue would be
present on other targets when <math.h> gets included somehow.
To avoid this, this patch #undef's both macros.
Bootstrapped without regressions on i386-pc-solaris2.11 and
sparc-sun-solaris2.11.
Ok for trunk?
Rainer
--
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University
2022-11-01 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
gcc:
* builtins.cc (mathfn_built_in_2): #undef HUGE_VAL, NAN.
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# HG changeset patch
# Parent 3e5ba66da20edf52cdfe371ea2244c91d770f64a
builtins: Guard builtins.cc against HUGE_VAL and NAN definitions
diff --git a/gcc/builtins.cc b/gcc/builtins.cc
--- a/gcc/builtins.cc
+++ b/gcc/builtins.cc
@@ -1931,6 +1931,11 @@ mathfn_built_in_2 (tree type, combined_f
built_in_function fcodef64x = END_BUILTINS;
built_in_function fcodef128x = END_BUILTINS;
+ /* If <math.h> has been included somehow, HUGE_VAL and NAN definitions
+ break the uses below. */
+#undef HUGE_VAL
+#undef NAN
+
switch (fn)
{
#define SEQ_OF_CASE_MATHFN \
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] builtins: Guard builtins.cc against HUGE_VAL and NAN definitions
2022-11-02 9:13 [PATCH] builtins: Guard builtins.cc against HUGE_VAL and NAN definitions Rainer Orth
@ 2022-11-02 9:27 ` Jakub Jelinek
0 siblings, 0 replies; 2+ messages in thread
From: Jakub Jelinek @ 2022-11-02 9:27 UTC (permalink / raw)
To: Rainer Orth; +Cc: gcc-patches
On Wed, Nov 02, 2022 at 10:13:44AM +0100, Rainer Orth wrote:
> trunk bootstrap recently broke on Solaris like this:
>
> /vol/gcc/src/hg/master/local/gcc/builtins.cc:2104:8: error: pasting "CFN_BUILT_IN_" and "(" does not give a valid preprocessing token
> 2104 | case CFN_BUILT_IN_##MATHFN: \
> | ^~~~~~~~~~~~~
> /vol/gcc/src/hg/master/local/gcc/builtins.cc:2112:3: note: in expansion of macro 'CASE_MATHFN'
> 2112 | CASE_MATHFN(MATHFN) \
> | ^~~~~~~~~~~
> /vol/gcc/src/hg/master/local/gcc/builtins.cc:1967:5: note: in expansion of macro 'CASE_MATHFN_FLOATN'
> 1967 | CASE_MATHFN_FLOATN (HUGE_VAL) \
>
> and similarly for NAN.
>
> It turns out this happens because <math.h> is included at some point,
> which (in <iso/math_c99.h>) defines
>
> #define HUGE_VAL (__builtin_huge_val())
> #define NAN (__builtin_nanf(""))
>
> While this only happpens on Solaris right now, the same issue would be
> present on other targets when <math.h> gets included somehow.
>
> To avoid this, this patch #undef's both macros.
>
> Bootstrapped without regressions on i386-pc-solaris2.11 and
> sparc-sun-solaris2.11.
>
> Ok for trunk?
>
> Rainer
>
> --
> -----------------------------------------------------------------------------
> Rainer Orth, Center for Biotechnology, Bielefeld University
>
>
> 2022-11-01 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
>
> gcc:
> * builtins.cc (mathfn_built_in_2): #undef HUGE_VAL, NAN.
LGTM, thanks.
Jakub
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