go @1.17.13_0: environment variables for olders macOS versions cause bash to print "wrong substitution" and thus compiles fail.

[garoffoli (garoffoli)]

I've installed Go on my Mac running 10.9.5, after the install the follow message appears:

go has the following notes:
    Please note: Go 1.21 does not build on macOS 10.12 and older, so Go 1.17.13
    has been installed.
    go had to be specially patched and built to work on your platform.

    It likely won't work out of the box when building other projects, so make
    sure change your environment to use the following variables:
      * GO_EXTLINK_ENABLED="1"
    to always force go to use the external gcc or clang linker and
      * GO_LDFLAGS="\"-extldflags=${configure.ldflags}\""
      * CGO_LDFLAGS="-g -O2 ${configure.ldflags}"
    to force-link any binary against the legacy support library. Use exactly the
    quoting provided here, even if it may look odd, or compilation will fail.

    Failure to do so will leave you unable to create binaries that use features
    not natively available on your system, either directly or through a go core
    dependency.

However, when i copy the environment variables in .profiles. Bash throws up this error:

-bash: "-extldflags=${configure.ldflags}": wrong substitution
-bash: -g -O2 ${configure.ldflags}: wrong substitution

And because of this, i can't even compile a simple Hello World executable. (I attached the build log)

[garoffoli (garoffoli)]

Build Log

[kencu (Ken)]

the instructions don’t say it explicitly, but they are for Portfile additions, not for bash .profile additions.

[garoffoli (garoffoli)]

Replying to kencu:

the instructions don’t say it explicitly, but they are for Portfile additions, not for bash .profile additions.

How I can do that? Try to set these variables using

go env -w CGO_LDFLAGS="-g -O2 ${configure.ldflags}"

still gives a wrong substitution error

[RobK88]

@garoffoli - You will get a substitution error when running go env -w CGO_LDFLAGS="-g -O2 ${configure.ldflags}" in bash since ${configure.ldflags} is NOT defined in bash.

${configure.ldflags} is defined in MacPorts. When you set CGO_LDFLAGS="-g -O2 ${configure.ldflags}"in a Portfile, the environment variable will be set properly by MacPorts since Macports knows the value for ${configure.ldflags}. Bash does not.

[RobK88]

@garoffoli - Here is an example of setting these environment variables in a Portfile for a go program. One would include this code block in the Portfile:

pre-build {
#   Sierra and earlier
    if { ${os.platform} eq "darwin" && ${os.major} < 17 } {
        build.env-append    GO_EXTLINK_ENABLED="1" \
                            GO_LDFLAGS="\"-extldflags=${configure.ldflags}\"" \
                            CGO_LDFLAGS="-g -O2 ${configure.ldflags}"
    }
}

depends_build-append    port:legacy-support

Make sure you add the legacy-support port as a build dependency.

[RobK88]

I also have seen code written like this:

PortGroup           legacysupport 1.1

legacysupport.newest_darwin_requires_legacy 16

pre-build {
#   Sierra and earlier
    if {${os.platform} eq "darwin" && ${os.major} <= ${legacysupport.newest_darwin_requires_legacy}} {
        build.env-append    GO_EXTLINK_ENABLED="1" \
                            GO_LDFLAGS="\"-extldflags=${configure.ldflags}\"" \
                            CGO_LDFLAGS="-g -O2 ${configure.ldflags}"
    }
}

[RobK88]

P.S. The sample code above will not help you at this time. There is another problem! The legacy go compiler, @1.7.13, that runs on Lion, Mtn Lion etc is now completely broken.

See ​https://trac.macports.org/ticket/68700

[tehcog (tehcog)]

I haven't been able to get anything that uses 'go' to upgrade for quite some time now on Mavericks (exa: [66296 ​https://trac.macports.org/ticket/66296], fzf: [66295 ​https://trac.macports.org/ticket/66295]). Looks like the same may be becomming true with rust as well ([68719 ​https://trac.macports.org/ticket/68719]). I can understand google breaking everything as it is now to be expected, but Et tu, Rust? o_0