https://github.com/mjklemm updated
https://github.com/llvm/llvm-project/pull/73124
>From ba38aec7ac04c63fd5167908fe7f91d6ac7bceed Mon Sep 17 00:00:00 2001
From: Michael Klemm <michael.kl...@amd.com>
Date: Wed, 22 Nov 2023 14:22:20 +0100
Subject: [PATCH 1/2] Let the linker fail on multiple definitions of main()
---
clang/lib/Driver/ToolChains/CommonArgs.cpp | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp
b/clang/lib/Driver/ToolChains/CommonArgs.cpp
index 5d2cd1959b06925..30c249d05677ce5 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -1018,7 +1018,20 @@ void tools::addFortranRuntimeLibs(const ToolChain &TC,
const ArgList &Args,
break;
}
} else {
+ // --whole-archive needs to be part of the link line to make sure
+ // that the main() function from Fortran_main.a is pulled in by
+ // the linker.
+ //
+ // We are using this --whole-archive/--no-whole-archive bracket w/o
+ // any further checks, because -Wl,--whole-archive at the flang-new new
+ // line will not sucessfully complete, unless the user correctly specified
+ // -Wl,--no-whole-archive (e.g., -Wl,--whole-archive -ldummy
+ // -Wl,--no-whole-archive).
+ CmdArgs.push_back("--whole-archive");
CmdArgs.push_back("-lFortran_main");
+ CmdArgs.push_back("--no-whole-archive");
+
+ // Perform regular linkage of the remaining runtime libraries.
CmdArgs.push_back("-lFortranRuntime");
CmdArgs.push_back("-lFortranDecimal");
}
@@ -1029,7 +1042,7 @@ void tools::addFortranRuntimeLibraryPath(const ToolChain
&TC,
ArgStringList &CmdArgs) {
// Default to the <driver-path>/../lib directory. This works fine on the
// platforms that we have tested so far. We will probably have to re-fine
- // this in the future. In particular, on some platforms, we may need to use
+ // this in the future. In particular, on some platforms, we may need to useq
// lib64 instead of lib.
SmallString<256> DefaultLibPath =
llvm::sys::path::parent_path(TC.getDriver().Dir);
>From 7d1180b11ed02cedf1c9fea56bf2ff329274c066 Mon Sep 17 00:00:00 2001
From: Michael Klemm <michael.kl...@amd.com>
Date: Wed, 22 Nov 2023 15:18:51 +0100
Subject: [PATCH 2/2] Improve comments and remove accidental typo
---
clang/lib/Driver/ToolChains/CommonArgs.cpp | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp
b/clang/lib/Driver/ToolChains/CommonArgs.cpp
index 30c249d05677ce5..12e3ce184898250 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -1023,10 +1023,10 @@ void tools::addFortranRuntimeLibs(const ToolChain &TC,
const ArgList &Args,
// the linker.
//
// We are using this --whole-archive/--no-whole-archive bracket w/o
- // any further checks, because -Wl,--whole-archive at the flang-new new
- // line will not sucessfully complete, unless the user correctly specified
- // -Wl,--no-whole-archive (e.g., -Wl,--whole-archive -ldummy
- // -Wl,--no-whole-archive).
+ // any further checks, because -Wl,--whole-archive at the flang
+ // driver's link line will not sucessfully complete, unless the user
+ // correctly specified -Wl,--whole-archive/-Wl,--no-whole-archive
+ // (e.g., -Wl,--whole-archive -ldummy -Wl,--no-whole-archive).
CmdArgs.push_back("--whole-archive");
CmdArgs.push_back("-lFortran_main");
CmdArgs.push_back("--no-whole-archive");
@@ -1042,7 +1042,7 @@ void tools::addFortranRuntimeLibraryPath(const ToolChain
&TC,
ArgStringList &CmdArgs) {
// Default to the <driver-path>/../lib directory. This works fine on the
// platforms that we have tested so far. We will probably have to re-fine
- // this in the future. In particular, on some platforms, we may need to useq
+ // this in the future. In particular, on some platforms, we may need to use
// lib64 instead of lib.
SmallString<256> DefaultLibPath =
llvm::sys::path::parent_path(TC.getDriver().Dir);
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