Re: git: 4ba3797c9993 - main - graphics/png: fix build with clang 15
Date: Sun, 31 Jul 2022 18:39:06 UTC
Dimitry Andric <dim@FreeBSD.org> writes: > The branch main has been updated by dim (src committer): > > URL: https://cgit.FreeBSD.org/ports/commit/?id=4ba3797c9993a25a082ed767d4f44234b1f7dc04 > > commit 4ba3797c9993a25a082ed767d4f44234b1f7dc04 > Author: Dimitry Andric <dim@FreeBSD.org> > AuthorDate: 2022-07-30 16:37:48 +0000 > Commit: Dimitry Andric <dim@FreeBSD.org> > CommitDate: 2022-07-31 17:12:11 +0000 > > graphics/png: fix build with clang 15 > > Building png with clang 15 results in an error: > > contrib/libtests/pngvalid.c:11662:4: error: call to undeclared function 'feenableexcept'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] > feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW); > ^ > > This is because clang 15 introduced this new warning, and fenv.h only > declares feenableexcept() when compiling for C standards before C11. -Wimplicit-function-declaration is ancient, so Clang 15 made it fatal for C99 or later. feenableexcept() is under __BSD_VISIBLE, so hidden in _POSIX_SOURCE mode as used by libpng. Linux cheats via _GNU_SOURCE which is ignored on FreeBSD, so you get the above warning. Where did C11 come from? See also https://github.com/llvm/llvm-project/commit/7d644e1215b3