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dummy _start function for libc-free cases

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This commit is contained in:
Li Jie
2025-07-30 11:05:55 +08:00
parent 6f829d0d43
commit 49a5d3a350
1 changed files with 17 additions and 2 deletions
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19
internal/build/build.go
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@@ -658,7 +658,6 @@ func linkObjFiles(ctx *context, app string, objFiles, linkArgs []string, verbose
buildArgs = append(buildArgs, "-gdwarf-4") buildArgs = append(buildArgs, "-gdwarf-4")
} }
buildArgs = append(buildArgs, ctx.crossCompile.CCFLAGS...)
buildArgs = append(buildArgs, ctx.crossCompile.LDFLAGS...) buildArgs = append(buildArgs, ctx.crossCompile.LDFLAGS...)
buildArgs = append(buildArgs, ctx.crossCompile.EXTRAFLAGS...) buildArgs = append(buildArgs, ctx.crossCompile.EXTRAFLAGS...)
buildArgs = append(buildArgs, objFiles...) buildArgs = append(buildArgs, objFiles...)
@@ -712,9 +711,23 @@ call i32 @setvbuf(ptr %stdout_ptr, ptr null, i32 2, %size_t 0)
call i32 @setvbuf(ptr %stderr_ptr, ptr null, i32 2, %size_t 0) call i32 @setvbuf(ptr %stderr_ptr, ptr null, i32 2, %size_t 0)
` `
} }
// TODO(lijie): workaround for libc-free
// Remove main/_start when -buildmode and libc are ready
startDefine := `
define weak void @_start() {
; argc = 0
%argc_val = icmp eq i32 0, 0
%argc = zext i1 %argc_val to i32
; argv = null
%argv = inttoptr i64 0 to i8**
call i32 @main(i32 %argc, i8** %argv)
ret void
}
`
mainDefine := "define i32 @main(i32 noundef %0, ptr nocapture noundef readnone %1) local_unnamed_addr" mainDefine := "define i32 @main(i32 noundef %0, ptr nocapture noundef readnone %1) local_unnamed_addr"
if isWasmTarget(ctx.buildConf.Goos) { if isWasmTarget(ctx.buildConf.Goos) {
mainDefine = "define hidden noundef i32 @__main_argc_argv(i32 noundef %0, ptr nocapture noundef readnone %1) local_unnamed_addr" mainDefine = "define hidden noundef i32 @__main_argc_argv(i32 noundef %0, ptr nocapture noundef readnone %1) local_unnamed_addr"
startDefine = ""
} }
mainCode := fmt.Sprintf(`; ModuleID = 'main' mainCode := fmt.Sprintf(`; ModuleID = 'main'
source_filename = "main" source_filename = "main"
@@ -735,6 +748,8 @@ define weak void @"syscall.init"() {
ret void ret void
} }
%s
%s { %s {
_llgo_0: _llgo_0:
store i32 %%0, ptr @__llgo_argc, align 4 store i32 %%0, ptr @__llgo_argc, align 4
@@ -749,7 +764,7 @@ _llgo_0:
} }
`, declSizeT, stdioDecl, `, declSizeT, stdioDecl,
pyInitDecl, rtInitDecl, mainPkgPath, mainPkgPath, pyInitDecl, rtInitDecl, mainPkgPath, mainPkgPath,
mainDefine, stdioNobuf, startDefine, mainDefine, stdioNobuf,
pyInit, rtInit, mainPkgPath, mainPkgPath) pyInit, rtInit, mainPkgPath, mainPkgPath)
return exportObject(ctx, pkg.PkgPath+".main", pkg.ExportFile+"-main", []byte(mainCode)) return exportObject(ctx, pkg.PkgPath+".main", pkg.ExportFile+"-main", []byte(mainCode))