thumb-linux-gnueabi

[alexrp]

-- Check for working C compiler: /home/alexrp/Source/zig-bootstrap/out/host/bin/zig
-- Check for working C compiler: /home/alexrp/Source/zig-bootstrap/out/host/bin/zig - broken
CMake Error at /usr/share/cmake-3.27/Modules/CMakeTestCCompiler.cmake:67 (message):
  The C compiler

    "/home/alexrp/Source/zig-bootstrap/out/host/bin/zig"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: '/home/alexrp/Source/zig-bootstrap/out/build-zlib-thumb-linux-gnueabi-baseline/CMakeFiles/CMakeScratch/TryCompile-WSA6UU'

    Run Build Command(s): /usr/bin/cmake -E env VERBOSE=1 /usr/bin/gmake -f Makefile cmTC_5282a/fast
    /usr/bin/gmake  -f CMakeFiles/cmTC_5282a.dir/build.make CMakeFiles/cmTC_5282a.dir/build
    gmake[1]: Entering directory '/home/alexrp/Source/zig-bootstrap/out/build-zlib-thumb-linux-gnueabi-baseline/CMakeFiles/CMakeScratch/TryCompile-WSA6UU'
    Building C object CMakeFiles/cmTC_5282a.dir/testCCompiler.c.o
    /home/alexrp/Source/zig-bootstrap/out/host/bin/zig cc -fno-sanitize=all -s -target thumb-linux-gnueabi -mcpu=baseline    -MD -MT CMakeFiles/cmTC_5282a.dir/testCCompiler.c.o -MF CMakeFiles/cmTC_5282a.dir/testCCompiler.c.o.d -o CMakeFiles/cmTC_5282a.dir/testCCompiler.c.o -c /home/alexrp/Source/zig-bootstrap/out/build-zlib-thumb-linux-gnueabi-baseline/CMakeFiles/CMakeScratch/TryCompile-WSA6UU/testCCompiler.c
    Linking C executable cmTC_5282a
    /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_5282a.dir/link.txt --verbose=1
    /home/alexrp/Source/zig-bootstrap/out/host/bin/zig cc -fno-sanitize=all -s -target thumb-linux-gnueabi -mcpu=baseline CMakeFiles/cmTC_5282a.dir/testCCompiler.c.o -o cmTC_5282a
    In file included from /home/alexrp/Source/zig-bootstrap/out/host/lib/zig/libc/glibc/sysdeps/arm/crti.S:44:
    In file included from /home/alexrp/Source/zig-bootstrap/out/host/lib/zig/libc/glibc/sysdeps/unix/sysv/linux/arm/sysdep.h:37:
    /home/alexrp/Source/zig-bootstrap/out/host/lib/zig/libc/include/generic-glibc/bits/hwcap.h:20:3: error: "Never include <bits/hwcap.h> directly; use <sys/auxv.h> instead."
       20 | # error "Never include <bits/hwcap.h> directly; use <sys/auxv.h> instead."
          |   ^
    1 error generated.
    gmake[1]: *** [CMakeFiles/cmTC_5282a.dir/build.make:100: cmTC_5282a] Error 1
    gmake[1]: Leaving directory '/home/alexrp/Source/zig-bootstrap/out/build-zlib-thumb-linux-gnueabi-baseline/CMakeFiles/CMakeScratch/TryCompile-WSA6UU'
    gmake: *** [Makefile:127: cmTC_5282a/fast] Error 2





  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:4 (project)


-- Configuring incomplete, errors occurred!

[alexrp]

This (and #177, #181, #182) are caused by the way we treat the thumb*-linux-gnu* target triples. They don't get their own directory under lib/libc/include, and as a result, #include <bits/hwcap.h> picks up lib/libc/include/generic-glibc/bits/hwcap.h instead of the intended include/arm*-linux-gnu*/bits/hwcap.h.

[alexrp]

However, grepping for NO_THUMB in glibc strongly suggests that glibc does not actually support pure Thumb-2 mode, which is what these target triples mean. Need to investigate a bit more, but currently leaning towards these target triples just being removed. (Note: musl seems to support it just fine.)

[alexrp]

• https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/arm/memcpy.S;h=6d1928ac16fa1ae5630382a389542b5a4fa64da1;hb=HEAD#l20
• https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/arm/sysdep.h;h=8b7fee7f3b3b81f9b5d45039725dfaaa3cf1cf6e;hb=HEAD#l139