can't build for Arch host on Fedora 39

[pljakobs]

This is probably none of Sming's fault, but since I've just experienced it, I thought I'd document it here:
After updating from Fedora 38 to 39, it seems I cannot build for the Host architecure anymore.

$ make SMING_ARCH=Host
/opt/Sming/Sming/build.mk:227: *** Compiler '' not recognised. Please install GCC tools.. 

I found a few pointers that might be connected to this:
https://discussion.fedoraproject.org/t/fedora-39-issues-compiling-for-32-bit-on-a-64-bit-system-with-gcc/95954

So, I'm not really sure if the error I'm seeing (basically failure to select a compiler) is something in the Sming build system or just an issue in F39.

glibc and libgcc installed as .i686 packages.

[mikee47]

What do you get with gcc -v ?

[pljakobs]

$ LANG=C gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/13/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure \
    --enable-bootstrap \
    --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,m2,lto \
    --prefix=/usr \
    --mandir=/usr/share/man \
    --infodir=/usr/share/info \
    --with-bugurl=http://bugzilla.redhat.com/bugzilla \
    --enable-shared --enable-threads=posix \
    --enable-checking=release \
    --enable-multilib \
    --with-system-zlib \
    --enable-__cxa_atexit \
    --disable-libunwind-exceptions \
    --enable-gnu-unique-object \
    --enable-linker-build-id \
    --with-gcc-major-version-only \
    --enable-libstdcxx-backtrace \
    --with-libstdcxx-zoneinfo=/usr/share/zoneinfo \
    --with-linker-hash-style=gnu \
    --enable-plugin \
    --enable-initfini-array \
    --with-isl=/builddir/build/BUILD/gcc-13.3.1-20240522/obj-x86_64-redhat-linux/isl-install \
    --enable-offload-targets=nvptx-none \
    --without-cuda-driver \
    --enable-offload-defaulted \
    --enable-gnu-indirect-function \
    --enable-cet \
    --with-tune=generic \
    --with-arch_32=i686 \
    --build=x86_64-redhat-linux \
    --with-build-config=bootstrap-lto \
    --enable-link-serialization=1
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.3.1 20240522 (Red Hat 13.3.1-1) (GCC) 

so, --with-arch_32=i686 seems to indicate that it can do 32 bit?

[mikee47]

The logic for compiler version detection changed in #2798 to support clang. Previously we parsed gcc -dumpversion but this is now gcc -v so we can get the compiler name as well.

This happens in Sming/build.mk line 214:

$(CC) -v 2>&1 | $(AWK) -F " version " '/ version /{ a=$1; gsub(/ +/, "-", a); print a, $2}'

It should produce gcc 13.3.1 20240522 (Red Hat 13.3.1-1) (GCC) for you.

If either CC or AWK are incorrect then this filter produces an empty string (rather than perhaps a more useful error message). The logic here could do with a little improvement I think.

Anyway, to debug this, try adding this line just before it:

$(info CC = $(CC))
$(info AWK = $(AWK))
$(info $(shell $(CC) -v))

[pljakobs]

I think I found it! My setup is using German language so the version Line is "gcc-Version 13.3.1 20240522 (Red Hat 13.3.1-1) (GCC)" whereas in the English language message, "version" is lower case.

so, while make SMING_ARCH=Host fails to identify the compiler, LANG=C make SMING_ARCH=Host works.

here's the output of gcc -v

$ gcc -v
Es werden eingebaute Spezifikationen verwendet.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/13/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Ziel: x86_64-redhat-linux
Konfiguriert mit: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,m2,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --enable-libstdcxx-backtrace --with-libstdcxx-zoneinfo=/usr/share/zoneinfo --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-13.3.1-20240522/obj-x86_64-redhat-linux/isl-install --enable-offload-targets=nvptx-none --without-cuda-driver --enable-offload-defaulted --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux --with-build-config=bootstrap-lto --enable-link-serialization=1
Thread-Modell: posix
Unterstützte LTO-Kompressionsalgorithmen: zlib zstd
gcc-Version 13.3.1 20240522 (Red Hat 13.3.1-1) (GCC) 

and here of LANG=C gcc -v

$ LANG=C gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/13/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,m2,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --enable-libstdcxx-backtrace --with-libstdcxx-zoneinfo=/usr/share/zoneinfo --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-13.3.1-20240522/obj-x86_64-redhat-linux/isl-install --enable-offload-targets=nvptx-none --without-cuda-driver --enable-offload-defaulted --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux --with-build-config=bootstrap-lto --enable-link-serialization=1
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.3.1 20240522 (Red Hat 13.3.1-1) (GCC) 

I suggest using LANG=C for compiler detection, as there are certainly other situations with non English language where this will fail.

# Detect compiler version and name
DEBUG_VARS                              += COMPILER_VERSION_FULL COMPILER_VERSION COMPILER_NAME
COMPILER_VERSION_FULL   := $(shell LANG=C $(CC) -v 2>&1 | $(AWK) -F " version " '/ [Vv]ersion /{ a=$$1; gsub(/ +/, "-", a); print a, $$2}')
COMPILER_NAME                   := $(word 1,$(COMPILER_VERSION_FULL))
COMPILER_VERSION                := $(word 2,$(COMPILER_VERSION_FULL))

[mikee47]

Thank you! Good catch, will get that fixed.