On Thu, Sep 18, 2014 at 09:51:19AM +0200, Jörg Krause wrote:
> glibc, uclibc, and musl uses feature test macros to expose definitions
> conforming to the standards ISO C, POSIX and extensions. According to
> which feature test macros are defined by the user or the compiler,
> the header file <features.h> used by these libraries internally defines
> various other macros.
>
> glibc and uclibc also defines release test macros, eg __GLIBC__ and
> __UCLIBC__ in <features.h>. musl does not have (and do not want) such
> a macro like __MUSL__.
>
> Building ffmpeg with the musl toolchain needs the feature test macro
> _XOPEN_SOURCE=600 to be defined. As it is not possible to detect musl
> check for the <features.h> header file, which is assumed to be specific
> to glibc, uclibc, and musl.
>
> Signed-off-by: Jörg Krause <jkra...@posteo.de>
> ---
> configure | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/configure b/configure
> index 110a3fd..528e4fc 100755
> --- a/configure
> +++ b/configure
> @@ -4182,6 +4182,11 @@ esac
> probe_libc(){
> pfx=$1
> pfx_no_=${pfx%_}
> + # feature test macros are understood by glibc, uclibc, and musl
> + if check_header features.h; then
> + # _XOPEN_SOURCE=600 implicitly defines _POSIX_C_SOURCE=200112L
> + add_${pfx}cppflags -D_XOPEN_SOURCE=600
> + fithis adds "-D_XOPEN_SOURCE=600" twice to the flags for glibc adding this as an elif entry at the end should avoid that [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB In a rich man's house there is no place to spit but his face. -- Diogenes of Sinope
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