[Bug 2008090] Review Request: libzdnn - IBM Z specific hardware exploitation library

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https://bugzilla.redhat.com/show_bug.cgi?id=2008090



--- Comment #5 from Dan Horák <dan@xxxxxxxx> ---
I think the passing of -march=z14 will need some thinking, because I see 2
kinds of gcc command lines

gcc -O3 -march=z14 -mzvector -Wall -std=gnu99 -fstack-protector-all -O2
-flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall
-Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -march=zEC12 -mtune=z13
-fasynchronous-unwind-tables -fstack-clash-protection -march=z14 -funroll-loops
"-Wall" -I ../zdnn -I . -fPIC  -c init_ztensor.c -o obj/init_ztensor.o

and 

gcc -O3 -mzvector -Wall -std=gnu99 -fstack-protector-all -O2 -flto=auto
-ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall
-Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -march=zEC12 -mtune=z13
-fasynchronous-unwind-tables -fstack-clash-protection -march=z14 "-Wall" -fPIC 
-c zdnn_init.c -o obj/zdnn_init.o

The first one has -march=z14 twice, the second has one occurrence. The
"appended" -march overrides the distro wide flags, which is OK in the first
case,  I think, but not in the second ...


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