[Buildroot] [PATCH] imx-usb-loader: fix build with older gcc

[Peter Korsgaard]

>>>>> "Baruch" == Baruch Siach <baruch at tkos.co.il> writes:

 > Since the last version bump imx-usb-loader uses __builtin_bswap16 which
 > is not universally available in gcc older than version 4.8. Add a patch
 > switching to a local 16-bit bytes swap implementation.

 > Should fix:
 > http://autobuild.buildroot.net/results/a63/a63b593b7ef3b6d32e755afe42b77d47dbf0276e/
 > http://autobuild.buildroot.net/results/48c/48c95cfc65f99fa02be81a11303ba8999f57091a/
 > http://autobuild.buildroot.net/results/c9d/c9d4f99b49ddb9b2ce08fce7672dd7c70cf62912/

 > Cc: Adam Duskett <aduskett at gmail.com>
 > Signed-off-by: Baruch Siach <baruch at tkos.co.il>
 > ---
 >  ....h-fix-build-with-gcc-older-than-4.8.patch | 42 +++++++++++++++++++
 >  1 file changed, 42 insertions(+)
 >  create mode 100644 package/imx-usb-loader/0001-portable.h-fix-build-with-gcc-older-than-4.8.patch

 > diff --git
 > a/package/imx-usb-loader/0001-portable.h-fix-build-with-gcc-older-than-4.8.patch
 > b/package/imx-usb-loader/0001-portable.h-fix-build-with-gcc-older-than-4.8.patch
 > new file mode 100644
 > index 000000000000..c0aabed542c6
 > --- /dev/null
 > +++ b/package/imx-usb-loader/0001-portable.h-fix-build-with-gcc-older-than-4.8.patch
 > @@ -0,0 +1,42 @@
 > +From c581e6037ec7ab2f9cd615f6ffa149b4d0a5638c Mon Sep 17 00:00:00 2001
 > +From: Baruch Siach <baruch at tkos.co.il>
 > +Date: Tue, 19 Jun 2018 15:31:52 +0300
 > +Subject: [PATCH] portable.h: fix build with gcc older than 4.8
 > +
 > +__builtin_bswap16 is available in all gcc architectures only since
 > +version 4.8. Older gcc versions fail to build:
 > +
 > +imx_sdp.o: In function `perform_dcd':
 > +.../imx_sdp.c:1138: undefined reference to `__builtin_bswap16'
 > +imx_sdp.o: In function `write_dcd_table_ivt':
 > +.../imx_sdp.c:457: undefined reference to `__builtin_bswap16'
 > +imx_sdp.o: In function `write_dcd':
 > +.../imx_sdp.c:410: undefined reference to `__builtin_bswap16'
 > +imx_sdp.o: In function `init_header':
 > +.../imx_sdp.c:1075: undefined reference to `__builtin_bswap16'
 > +
 > +Use a local implementation instead.
 > +
 > +Signed-off-by: Baruch Siach <baruch at tkos.co.il>
 > +---
 > +Upstream status: https://github.com/boundarydevices/imx_usb_loader/pull/82
 > +
 > + portable.h | 2 +-
 > + 1 file changed, 1 insertion(+), 1 deletion(-)
 > +
 > +diff --git a/portable.h b/portable.h
 > +index 364fe47b212a..364832b5ea69 100644
 > +--- a/portable.h
 > ++++ b/portable.h
 > +@@ -58,7 +58,7 @@ extern int debugmode;
 > + #ifdef __GNUC__
 > + #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 > + #define BE32(x) __builtin_bswap32(x)
 > +-#define BE16(x) __builtin_bswap16(x)
 > ++#define BE16(x) (x<<8 | x>>8)

I take it this is never called on anything where the double evaluation
causes any side effects?

Committed, thanks.

-- 
Bye, Peter Korsgaard