Makefile: Support passing environment variables through make--and use…

[daym]

… it to support host compilers that use environment variables CPATH etc. See Issue #609.

[daym]

TODO: Test via:

cd heads
make BOARD=YourBoard real.clean
rm -rf crossgcc
make BOARD=YourBoard

on fedora-30.

[daym]

With make BOARD=qemu-linuxboot on Guix I get:

gawk: fatal: cannot use gawk builtin `namespace' as variable

in libgpg-error 1.32 that you download.

Gawk used is v5.0.1.

See also https://stackoverflow.com/questions/55664467/gawk-error-when-compiling-libgpg-error-in-crossdev-armv7a-environment

[tlaurion]

@daym please see #714

[tlaurion]

@daym : Fixes were merged upstream. Please retest!

[daym]

Rebased to your current master. Works fine for BOARD=qemu-linuxboot.

[tlaurion]

@daym Testing this locally

[tlaurion]

@daym #609 (comment)

[tlaurion]

@daym : You can see the results of failed builds at each additional commit by clicking the check details of each PR; then click details which will bring you to CircleCI build of your commit, where you can see errors of the current attempted build.

This is a long process, since each PR builds the whole cross-gcc-make toolchain and then the boards defined there. The 9021606 commit resulted in this failed build

Current log exerpt:

tail /root/project/build/log/libpng.log

-----

make -C "/root/project/build/libpng-1.6.34"  CC=/root/project/crossgcc/bin/x86_64-linux-musl-gcc -fdebug-prefix-map=/root/project=heads -gno-record-gcc-switches -D__MUSL__ -I/root/project/install/include -L/root/project/install/lib  CPP=/root/project/crossgcc/bin/x86_64-linux-musl-cpp CXXCPP=/root/project/crossgcc/bin/x86_64-linux-musl-cpp    AR=/root/project/crossgcc/bin/x86_64-linux-musl-ar LD=/root/project/crossgcc/bin/x86_64-linux-musl-ld STRIP=/root/project/crossgcc/bin/x86_64-linux-musl-strip NM=/root/project/crossgcc/bin/x86_64-linux-musl-nm OBJCOPY=/root/project/crossgcc/bin/x86_64-linux-musl-objcopy OBJDUMP=/root/project/crossgcc/bin/x86_64-linux-musl-objdump PKG_CONFIG_PATH=/root/project/install/lib/pkgconfig PKG_CONFIG_SYSROOT_DIR=/root/project/install   DESTDIR=/root/project/install install 

make[1]: Entering directory '/root/project/build/libpng-1.6.34'

rm -f pnglibconf.c pnglibconf.tf[45]

mawk -f ./scripts/options.awk out=pnglibconf.tf4 version=search\

    ./pngconf.h ./scripts/pnglibconf.dfa\

    ./pngusr.dfa  1>&2

mawk -f ./scripts/options.awk out=pnglibconf.tf5 pnglibconf.tf4 1>&2

rm pnglibconf.tf4

mv pnglibconf.tf5 pnglibconf.c

rm -f pnglibconf.out pnglibconf.tf[12]

test -d scripts || mkdir scripts || test -d scripts

/root/project/crossgcc/bin/x86_64-linux-musl-cpp -DHAVE_CONFIG_H -I. \

     -DPNGLIB_LIBNAME='PNG16_0' -DPNGLIB_VERSION='1.6.34' -DSYMBOL_PREFIX='' -DPNG_NO_USE_READ_MACROS -DPNG_BUILDING_SYMBOL_TABLE  pnglibconf.c > pnglibconf.tf1

pnglibconf.c:33:11: fatal error: zlib.h: No such file or directory

 # include <zlib.h>

           ^~~~~~~~

compilation terminated.

make[1]: *** [Makefile:2208: pnglibconf.out] Error 1

make[1]: Leaving directory '/root/project/build/libpng-1.6.34'

make: *** [Makefile:387: /root/project/build/libpng-1.6.34/.build] Error 1

[tlaurion]

@daym Would love to chat with you. You seem to have expertise i'm looking for and we could collaborate in fixing the build system for everyone, including CIs.

Those were brought to my attention:

• https://guix.gnu.org/blog/2019/guix-reduces-bootstrap-seed-by-50/
• https://github.com/oriansj/stage0/

Maybe Heads is taking the wrong approach by depending on musl-cross-make.

Even more if looking to accomplish #590, which would depend on LTO in the goal of doing #571 and supporting smaller SPI chip devices like #453

Want to contact me from methods defined at insurgo.ca/#contact ?

[tlaurion]

@daym : the discussion could also happen under #609.

[tlaurion]

I think this is done, where nix is used now as #1661 is merged