[Bug 206348] x11-toolkits/qt5-gui : clang++ used with -mcpu=cortex-a7 -mfloat-abi=softfp results in: undefined reference to `qt_convert_rgb888_to_rgb32_neon( . . . )

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206348

--- Comment #3 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Tobias C. Berner from comment #2)

I'm attempting a x11-toolkits/qt5-gui build but it is causing builds of 126
ports, llvm37 included. (None of these were installed at the start for this
attempt.)

On the rpi2 this is going to take a while even if the rest of the ports
involved build without problems.

-mfloat-abi=soft is no longer involved.

I'm omitting -march=armv7-a and using only -mcpu=cortext-a7 for that aspect.
(Some non-clang compliers consider the two a conflict and reject the
combination.)

I'm building from a stable/11 system vintage:

$ uname -apKU
FreeBSD rpi2 11.0-PRERELEASE FreeBSD 11.0-PRERELEASE #6 r306344M: Mon Sep 26
12:08:55 PDT 2016    
markmi at FreeBSDx64:/usr/obj/clang/arm.armv6/usr/src/sys/RPI2-NODBG  arm armv6
1100503 1100503

I updated my /usr/ports first:

$ svnlite info /usr/ports/ | grep "Re[lv]"
Relative URL: ^/head
Revision: 423928
Last Changed Rev: 423928

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