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builder: use ar-chives for linking big sketches (was: use the @ syntax to reduce command line length if needed) #961

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Merged
merged 5 commits into from
Nov 12, 2020
Merged

builder: use ar-chives for linking big sketches (was: use the @ syntax to reduce command line length if needed) #961

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56fc6b7
Small cosmetic changes
cmaglie Sep 21, 2020
f20c72e
Create an archive file if the number of object files is too big
cmaglie Oct 26, 2020
9e038ea
fixed comments
cmaglie Oct 26, 2020
8177510
When exploiting ar-chives make a .a file for each soruce subfolder
cmaglie Oct 26, 2020
d2dfefc
using paths.PathList to keep objectFileList
cmaglie Oct 27, 2020
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35 changes: 25 additions & 10 deletions legacy/builder/phases/linker.go
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Original file line number Diff line number Diff line change
Expand Up @@ -59,23 +59,38 @@ func (s *Linker) Run(ctx *types.Context) error {
func link(ctx *types.Context, objectFiles paths.PathList, coreDotARelPath *paths.Path, coreArchiveFilePath *paths.Path, buildProperties *properties.Map) error {
objectFileList := strings.Join(utils.Map(objectFiles.AsStrings(), wrapWithDoubleQuotes), " ")

// If command line length is too big (> 30000 chars), try to collect the object files into an archive
// and use that archive to complete the build.
// If command line length is too big (> 30000 chars), try to collect the object files into archives
// and use that archives to complete the build.
if len(objectFileList) > 30000 {
objectFilesArchive := ctx.BuildPath.Join("object_files.a")
// Recreate the archive at every build
_ = objectFilesArchive.Remove()

// We must create an object file for each visited directory: this is required becuase gcc-ar checks
// if an object file is already in the archive by looking ONLY at the filename WITHOUT the path, so
// it may happen that a subdir/spi.o inside the archive may be overwritten by a anotherdir/spi.o
// because thery are both named spi.o.

properties := buildProperties.Clone()
properties.Set("archive_file", objectFilesArchive.Base())
properties.SetPath("archive_file_path", objectFilesArchive)
for _, objFile := range objectFiles {
properties.SetPath("object_file", objFile)
archives := map[string]bool{}
for _, object := range objectFiles {
archive := object.Parent().Join("objs.a")
if !archives[archive.String()] {
archives[archive.String()] = true
// Cleanup old archives
_ = archive.Remove()
}
properties.Set("archive_file", archive.Base())
properties.SetPath("archive_file_path", archive)
properties.SetPath("object_file", object)
_, _, err := builder_utils.ExecRecipe(ctx, properties, constants.RECIPE_AR_PATTERN, false, utils.ShowIfVerbose /* stdout */, utils.Show /* stderr */)
if err != nil {
return err
}
}
objectFileList = "-Wl,--whole-archive " + wrapWithDoubleQuotes(objectFilesArchive.String()) + " -Wl,--no-whole-archive"

objectFileList = ""
for archive := range archives {
objectFileList += " " + wrapWithDoubleQuotes(archive)
}
objectFileList = "-Wl,--whole-archive" + objectFileList + " -Wl,--no-whole-archive"
}

properties := buildProperties.Clone()
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