cmd/link: "x86_64-w64-mingw32/bin/ld.exe: Error: export ordinal too large" after upgrading to Go 1.15

[bep]

I have a Travis build that fails on Windows after upgrading to Go 1.15, see:

See: https://travis-ci.org/github/gohugoio/hugo/builds/717877247

Or more specific: https://travis-ci.org/github/gohugoio/hugo/jobs/717877253

x86_64-w64-mingw32/bin/ld.exe: Error: export ordinal too large: 77173

[deadprogram]

This looks like a case of needing the flag -buildmode=exe when building Go programs for Windows that use CGo. Seems linking Windows ASLR executables is what is not working.

[networkimprov]

@gopherbot add OS-Windows

cc @alexbrainman

[alexbrainman]

I do not know what the problem is.

But go 1.15 now passes --dynamicbase and --high-entropy-va flags to gcc for ASLR support. Perhaps your failure is related. Maybe you need to update your Mingw.

You can disable new flags by passing -buildmode=exe to go command as @deadprogram suggested.

Alex

[networkimprov]

A search for that error suggests that too many symbols are exported by a DLL. Is export the default when it doesn't need to be?

cc @zx2c4 @ianlancetaylor

[networkimprov]

@bep, everything builds except commands.test -- what's different about it?

[dmitshur]

Also /cc @cherrymui @aclements per owners.

[bep]

@bep, everything builds except commands.test -- what's different about it?

Compared to the other test packages, it starts a HTTP server ... But the main package also does that.

Note that I got the build going with buildMode=exe.