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 <r...@cebitec.uni-bielefeld.de>
gcc:
* builtins.cc (mathfn_built_in_2): #undef HUGE_VAL, NAN.
# 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 \
