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author | Szabolcs Nagy <nsz@port70.net> | 2012-12-19 04:05:30 +0100 |
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committer | Szabolcs Nagy <nsz@port70.net> | 2012-12-19 04:05:30 +0100 |
commit | e9e2b66e687bc0b4d07305a2b288ed8ff4ae5b4b (patch) | |
tree | c4fce41ccde790f927862ddd0092d1762ab0ff66 /include/link.h | |
parent | c6383b7b10303457306932584fc23f24b5153a81 (diff) | |
download | musl-e9e2b66e687bc0b4d07305a2b288ed8ff4ae5b4b.tar.gz musl-e9e2b66e687bc0b4d07305a2b288ed8ff4ae5b4b.tar.xz musl-e9e2b66e687bc0b4d07305a2b288ed8ff4ae5b4b.zip |
math: new type cast logic in tgmath.h
* return type logic is simplified a bit and fixed (see below) * return type of conj and cproj were wrong on int arguments * added comments about the pending issues (usually we don't have comments in public headers but this is not the biggest issue with tgmath.h) casting the result to the right type cannot be done in c99 (c11 _Generic can solve this but that is not widely supported), so the typeof extension of gcc is used and that the ?: operator has special semantics when one of the operands is a null pointer constant the standard is very strict about the definition of null pointer constants so typeof with ?: is still not enough so compiler specific workaround is used for now on gcc '!1.0' is a null pointer constant so we can use the old __IS_FP logic (eventhough it's non-standard) on clang (and on gcc as well) 'sizeof(void)-1' is a null pointer constant so we can use !(sizeof(*(0?(int*)0:(void*)__IS_FP(x)))-1) (this is non-standard as well), the old logic is used by default and this new one on clang
Diffstat (limited to 'include/link.h')
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