Date: Sat, 26 May 2012 14:49:41 +0200 From: Szabolcs Nagy <nsz@...t70.net> To: musl@...ts.openwall.com Subject: Re: A little more progress today with clang/LLVM * Richard Pennington <rich@...nware.com> [2012-05-26 06:39:25 -0500]: > My tgmath.h test cases fail, for example (f is a float, d is a double): > tgmath.h is non-trivial and is not extensively tested so there can be issues > ../../../../../src/libs/math/001tgmath.c:15:7: error: assigning to 'float' from > incompatible type 'typeof (*(0 > ? (typeof (0 ? (double *)0 : (void *)!!((1 ? 1 : ((f))) / 2)))0 : > (typeof (0 ? (typeof ((f)) *)0 : > (void *)!!!((1 ? 1 : ((f))) / 2)))0))' (aka 'void') sounds like a clang bug this code is marked with #ifdef __GNUC__ and uses __typeof__ and ?: trics to be able to cast the return value to the correct type to try the messy expression above in isolation you can use: #define T __typeof__ #define ISFP(x) !!((1?1:(x))/2) float f = 0.1; T(*(0 ? (T(0 ? (double *)0 : (void *)ISFP(f)))0 : (T(0 ? (T(f) *)0 : (void *)!ISFP(f)))0)) *x = &f; but i think clang gets the ?: thing wrong eg. try __typeof__(0 ? (char*)0 : (void*)1) p; void **pp = &p; __typeof__(0 ? (char*)0 : (void*)0) q; char **qq = &q; (this should compile cleanly)
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