[PATCH 3/3] devel/gcc: Check and build GNU sed if not available on build host

[Frank Kühndel]

Hello Chris,

our CI build the tools (rtems-source-builder git) for revision

c0edd80bcd27b3dad7ee7acf5ea129e81e6a6f64 "rtems/jpeg: Update the checksum"

OK and failed for revision

468fc79e8c7c8076e8b65be82ba2009e41dd6c8e "devel/gcc: Check and build GNU 
sed if not available on build host"

with missing dependencies for expat-devel (and as followup gmp-devel). 
Excerpt from the source-builder log:

checking size of unsigned __int128... 16
checking for library containing dlopen... none required
checking whether to use expat... yes
checking for libexpat... no
configure: error: expat is missing or unusable
make[2]: *** [Makefile:10085: configure-gdb] Error 1
make[2]: *** Waiting for unfinished jobs....

This happens in an opensuse leap 15.4 container within a build for RTEMS 
6 and ARM BSP. I tested on an almalinux container too and got the same 
error.

"expat" and "gmp" are usually build by the source-builder itself. Hence, 
I wonder whether these new additional dependencies on "expat-devel" and 
"gmp-devel" packages are added by intention or whether this may be a 
unwanted side effect of the patches?

Greetings
Frank

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