[Bug build/19450] New: scripts/check-c++-types.sh errors when CXX is unset

["msebor at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19450

            Bug ID: 19450
           Summary: scripts/check-c++-types.sh errors when CXX is unset
           Product: glibc
           Version: 2.23
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: msebor at redhat dot com
                CC: carlos at redhat dot com
  Target Milestone: ---

When glibc is configured in an environment without support for static linking
(including static versions of libstdc++, libc and libm), executing 'make check'
produces the output below.  This is because configure unsets the CXX make
variable while Makefile expects it to be set to "no" when there is no support
for C++:

  ifneq ($(CXX),no)

  vpath c++-types.data $(+sysdep_dirs)

  $(objpfx)c++-types-check.out: c++-types.data scripts/check-c++-types.sh
          scripts/check-c++-types.sh $< $(CXX) $(filter-out -std=gnu11
$(+gccwarn-c),$(CFLAGS)) $(CPPFLAGS) > $@; \
          $(evaluate-test)
  endif

Since other Makefiles expect CXX to be unset, the top level Makefile should be
changed accordingly to avoid running the test in the absence of the expected
C++ support.

$ make check
...
make[1]: Entering directory `/src/glibc-trunk'
scripts/check-c++-types.sh
sysdeps/unix/sysv/linux/powerpc/powerpc64/c++-types.data  -fgnu89-inline -O2
-Wall -Werror -Wundef -Wwrite-strings -fmerge-all-constants -frounding-math -g
-mlong-double-128 -ftls-model=initial-exec     -Iinclude   -I/build/glibc-trunk
 -Isysdeps/unix/sysv/linux/powerpc/powerpc64/fpu 
-Isysdeps/unix/sysv/linux/powerpc/powerpc64 
-Isysdeps/unix/sysv/linux/wordsize-64  -Isysdeps/unix/sysv/linux/powerpc 
-Isysdeps/powerpc/nptl  -Isysdeps/unix/sysv/linux/include
-Isysdeps/unix/sysv/linux  -Isysdeps/nptl  -Isysdeps/pthread  -Isysdeps/gnu 
-Isysdeps/unix/inet  -Isysdeps/unix/sysv  -Isysdeps/unix/powerpc 
-Isysdeps/unix  -Isysdeps/posix  -Isysdeps/powerpc/powerpc64/fpu/multiarch 
-Isysdeps/powerpc/powerpc64/fpu  -Isysdeps/powerpc/powerpc64/multiarch 
-Isysdeps/powerpc/powerpc64  -Isysdeps/wordsize-64  -Isysdeps/powerpc/fpu 
-Isysdeps/powerpc  -Isysdeps/ieee754/ldbl-128ibm  -Isysdeps/ieee754/ldbl-opt 
-Isysdeps/ieee754/dbl-64  -Isysdeps/ieee754/flt-32  -Isysdeps/ieee754 
-Isysdeps/generic   -Ilibio -I.   -D_LIBC_REENTRANT -include
/build/glibc-trunk/libc-modules.h -DMODULE_NAME=libc -include
include/libc-symbols.h       > /build/glibc-trunk/c++-types-check.out; \
scripts/evaluate-test.sh c++-types-check $? false false >
/build/glibc-trunk/c++-types-check.test-result
scripts/check-c++-types.sh: line 37: -O2: command not found
scripts/check-c++-types.sh: line 37: -O2: command not found
scripts/check-c++-types.sh: line 37: -O2: command not found
...

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