Hi!

I started using scripts/build-many-glibcs.py to do scheduled CI builds
with --full-gcc and noticed that in my setup (fairly new host GCC
version, and a small patch to use all-trunk versions for all relevant
sources from a local GIT mirror), I run into an issue with gcc-first:

/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/install/compilers/alpha-linux-gnu/alpha-glibc-linux-gnu/bin/ar  rc libgcc.a $objects
/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/install/compilers/alpha-linux-gnu/alpha-glibc-linux-gnu/bin/ranlib libgcc.a
/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/build/compilers/alpha-linux-gnu/gcc-first/./gcc/xgcc -B/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/build/compilers/alpha-linux-gnu/gcc-first/./gcc/ -B/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/install/compilers/alpha-linux-gnu/alpha-glibc-linux-gnu/bin/ -B/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/install/compilers/alpha-linux-gnu/alpha-glibc-linux-gnu/lib/ -isystem /var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/install/compilers/alpha-linux-gnu/alpha-glibc-linux-gnu/include -isystem /var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/install/compilers/alpha-linux-gnu/alpha-glibc-linux-gnu/sys-include    -g -O2 -mieee -O2  -g -O2 -mieee -DIN_GCC  -DCROSS_DIRECTORY_STRUCTURE  -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem ./include  -fPIC -mieee -mfp-rounding-mode=d -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector -Dinhibit_libc -fPIC -mieee -mfp-rounding-mode=d -I. -I. -I../.././gcc -I/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/src/gcc/libgcc -I/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/src/gcc/libgcc/. -I/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/src/gcc/libgcc/../gcc -I/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/src/gcc/libgcc/../include  -DHAVE_CC_TLS   -o _gcov_merge_add.o -MT _gcov_merge_add.o -MD -MP -MF _gcov_merge_add.dep -DL_gcov_merge_add -c /var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/src/gcc/libgcc/libgcov-merge.c
In file included from /var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/src/gcc/libgcc/libgcov-merge.c:26:
/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/src/gcc/libgcc/libgcov.h:49:10: fatal error: sys/mman.h: No such file or directory
   49 | #include <sys/mman.h>
      |          ^~~~~~~~~~~~
compilation terminated.
make[3]: *** [Makefile:924: _gcov_merge_add.o] Error 1
make[3]: Leaving directory '/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/build/compilers/alpha-linux-gnu/gcc-first/alpha-glibc-linux-gnu/libgcc'
make[2]: *** [Makefile:13209: all-target-libgcc] Error 2
make[2]: Leaving directory '/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/build/compilers/alpha-linux-gnu/gcc-first'
make[1]: *** [Makefile:1023: all] Error 2
make[1]: Leaving directory '/var/lib/laminar/run/glibcbot-alpha-linux-gnu/20/build/compilers/alpha-linux-gnu/gcc-first'

FAIL: compilers-alpha-linux-gnu gcc-first build


I found a long-standing PR for GCC:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100289 .  Maybe it would
be okay to pass --disable-gcov to overcome this?


diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
index 29c10c2916..b29e32e7bd 100755
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -1483,6 +1483,7 @@ class Config(object):
                          '--disable-threads',
                          '--disable-libatomic',
                          '--disable-decimal-float',
+                         '--disable-gcov',
                          '--disable-libffi',
                          '--disable-libgomp',
                          '--disable-libitm',

This gets me past this build step.

Thanks,
  Jan-Benedict

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