Fixup lld code even more and make sure gcc can use it (#350)

* Fixup lld code even more and make sure gcc can use it

* Apply suggestions from code review

Co-authored-by: Mosè Giordano <giordano@users.noreply.github.com>

---------

Co-authored-by: Mosè Giordano <giordano@users.noreply.github.com>

Author: gbaraldi

src/BuildToolchains.jl

@@ -31,11 +31,11 @@ function cmake_os(p::AbstractPlatform)
     end
 end
 
+lld_str(p::AbstractPlatform) = Sys.isapple(p) ? "ld64.lld" : "ld.lld"
 function linker_string(p::AbstractPlatform, clang_use_lld)
     target = triplet(p)
     aatarget = aatriplet(p)
-    lld_str = Sys.isapple(p) ? "ld64.lld" : "ld.lld"
-    return clang_use_lld ? "/opt/bin/$(target)/$(lld_str)" : "/opt/bin/$(target)/$(aatarget)-ld"
+    return clang_use_lld ? "/opt/bin/$(target)/$(lld_str(p))" : "/opt/bin/$(target)/$(aatarget)-ld"
 end
 
 function toolchain_file(bt::CMake, p::AbstractPlatform, host_platform::AbstractPlatform; is_host::Bool=false, clang_use_lld::Bool=false)

src/Runner.jl

@@ -787,10 +787,12 @@ function generate_compiler_wrappers!(platform::AbstractPlatform; bin_path::Abstr
         """
         wrapper(io, string("/opt/", aatriplet(p), "/bin/", string(aatriplet(p), "-dlltool")); allow_ccache=false, extra_cmds=extra_cmds, hash_args=true)
     end
+
+    lld_generic(io::IO, p::AbstractPlatform) =
+        return wrapper(io, "/opt/$(host_target)/bin/lld"; env=Dict("LD_LIBRARY_PATH"=>ld_library_path(platform, host_platform; csl_paths=false)), allow_ccache=false,)
     function lld(io::IO, p::AbstractPlatform)
-        lld_str = Sys.isapple(p) ? "ld64.lld" : "ld.lld"
         return wrapper(io,
-            "/opt/$(host_target)/bin/$(lld_str)";
+            "/opt/$(host_target)/bin/$(lld_str(p))";
             env=Dict("LD_LIBRARY_PATH"=>ld_library_path(platform, host_platform; csl_paths=false)), allow_ccache=false,
         )
     end
@@ -872,11 +874,11 @@ function generate_compiler_wrappers!(platform::AbstractPlatform; bin_path::Abstr
             # ld wrappers for clang's `-fuse-ld=$(target)`
             if Sys.isapple(p)
                 write_wrapper(ld, p, "ld64.$(t)")
-                write_wrapper(lld,p,"ld64.lld")
             else
                 write_wrapper(ld, p, "ld.$(t)")
-                write_wrapper(lld, p, "ld.lld")
             end
+            write_wrapper(lld,p,"$(t)-$(lld_str(p))")
+            write_wrapper(lld_generic, p, "$(t)-lld")
             write_wrapper(nm, p, "$(t)-nm")
             write_wrapper(libtool, p, "$(t)-libtool")
             write_wrapper(objcopy, p, "$(t)-objcopy")
@@ -942,8 +944,7 @@ function generate_compiler_wrappers!(platform::AbstractPlatform; bin_path::Abstr
         elseif Sys.iswindows(platform)
             append!(default_tools, ("dlltool", "windres", "winmc"))
         end
-
-        append!(default_tools, ("cc", "c++", "cpp", "f77", "gfortran", "gcc", "clang", "g++", "clang++"))
+        append!(default_tools, ("cc", "c++", "cpp", "f77", "gfortran", "gcc", "clang", "g++", "clang++", "lld", lld_str(platform)))
     end
     if :rust in compilers
         append!(default_tools, ("rustc","rustup","cargo"))

test/runners.jl

@@ -428,6 +428,68 @@ end
             @test contains(lines[end], r"^ +sdk 10\.14$")
         end
     end
+
+    @testset "Test lld usage" begin
+        mktempdir() do dir
+            ur = preferred_runner()(dir; platform=Platform("x86_64", "windows"), preferred_gcc_version=v"6")
+            iobuff = IOBuffer()
+            test_c = """
+            #include <stdlib.h>
+            int test(void) {
+                return 0;
+            }
+            """
+            test_script = """
+                set -e
+                echo '$(test_c)' > test.c
+                clang -Werror -shared test.c -o libtest.\${dlext}
+                """
+            cmd = `/bin/bash -c "$(test_script)"`
+            @test run(ur, cmd, iobuff)
+
+            test_script = """
+            set -e
+            echo '$(test_c)' > test.c
+            clang -Werror -v -shared test.c -o libtest.\${dlext}
+            """
+            iobuff = IOBuffer()
+            cmd = `/bin/bash -c "$(test_script)"`
+            @test run(ur, cmd, iobuff)
+            seekstart(iobuff)
+            @test occursin(r"ld.lld", readchomp(iobuff))
+        end
+
+        mktempdir() do dir
+            ur = preferred_runner()(dir; platform=Platform("x86_64", "linux", libc="musl"), preferred_gcc_version=v"9")
+            iobuff = IOBuffer()
+            test_c = """
+            #include <stdlib.h>
+            int test(void) {
+                return 0;
+            }
+            """
+            test_script = """
+                set -e
+                echo '$(test_c)' > test.c
+                gcc -Werror -shared test.c -fuse-ld=lld -o libtest.\${dlext}
+                """
+            cmd = `/bin/bash -c "$(test_script)"`
+            @test run(ur, cmd, iobuff)
+
+            test_script = """
+            set -e
+            echo '$(test_c)' > test.c
+            gcc -Werror -v -shared test.c -fuse-ld=lld -o libtest.\${dlext}
+            """
+            iobuff = IOBuffer()
+            cmd = `/bin/bash -c "$(test_script)"`
+            @test run(ur, cmd, iobuff)
+            seekstart(iobuff)
+            @test occursin(r"lld", readchomp(iobuff))
+        end
+    end
+
+
 end
 
 @testset "Shards" begin