[flang-commits] [clang] [flang] [clang][driver] Special care for -l flags in config files (PR #117573)
Paul Osmialowski via flang-commits
flang-commits at lists.llvm.org
Mon Nov 25 16:14:30 PST 2024
https://github.com/pawosm-arm updated https://github.com/llvm/llvm-project/pull/117573
>From 2acf432b48c275492d9c5d012e85da36750c9299 Mon Sep 17 00:00:00 2001
From: Pawel Osmialowski <pawel.osmialowski at arm.com>
Date: Mon, 25 Nov 2024 14:46:55 +0000
Subject: [PATCH] [clang][driver] Special care for -l and -Wl, flags in config
files
Currently, if a -l (or -Wl,) flag is added into a config file
(e.g. clang.cfg), it is situated before any object file in the
effective command line. If the library requested by given -l flag is
static, its symbols will not be made visible to any of the object
files provided by the user. Also, the presence of any of the linker
flags in a config file confuses the driver whenever the user invokes
clang without any parameters.
This patch solves both of those problems, by moving the -l and -Wl,
flags specified in a config file to the end of the input list, and by
discarding them when there are no other inputs provided by the user,
or the last phase is not the linking phase.
---
clang/include/clang/Driver/Driver.h | 3 +++
clang/lib/Driver/Driver.cpp | 33 +++++++++++++++++++++++++++
clang/test/Driver/Inputs/config-l.cfg | 1 +
clang/test/Driver/config-file.c | 21 +++++++++++++++++
flang/test/Driver/Inputs/config-l.cfg | 1 +
flang/test/Driver/config-file.f90 | 21 +++++++++++++++++
6 files changed, 80 insertions(+)
create mode 100644 clang/test/Driver/Inputs/config-l.cfg
create mode 100644 flang/test/Driver/Inputs/config-l.cfg
diff --git a/clang/include/clang/Driver/Driver.h b/clang/include/clang/Driver/Driver.h
index 9177d56718ee77..b21606b6f54b77 100644
--- a/clang/include/clang/Driver/Driver.h
+++ b/clang/include/clang/Driver/Driver.h
@@ -297,6 +297,9 @@ class Driver {
/// Object that stores strings read from configuration file.
llvm::StringSaver Saver;
+ /// Linker inputs originated from configuration file.
+ std::unique_ptr<llvm::opt::InputArgList> CfgLinkerInputs;
+
/// Arguments originated from configuration file.
std::unique_ptr<llvm::opt::InputArgList> CfgOptions;
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index ad14b5c9b6dc80..c606cd332e47d4 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -1062,6 +1062,16 @@ bool Driver::readConfigFile(StringRef FileName,
for (Arg *A : *NewOptions)
A->claim();
+ std::unique_ptr<InputArgList> NewLinkerIns = std::make_unique<InputArgList>();
+ for (Arg *A : NewOptions->filtered(options::OPT_Wl_COMMA, options::OPT_l)) {
+ const Arg *BaseArg = &A->getBaseArg();
+ if (BaseArg == A)
+ BaseArg = nullptr;
+ appendOneArg(*NewLinkerIns, A, BaseArg);
+ }
+ NewOptions->eraseArg(options::OPT_Wl_COMMA);
+ NewOptions->eraseArg(options::OPT_l);
+
if (!CfgOptions)
CfgOptions = std::move(NewOptions);
else {
@@ -1073,6 +1083,19 @@ bool Driver::readConfigFile(StringRef FileName,
appendOneArg(*CfgOptions, Opt, BaseArg);
}
}
+
+ if (!CfgLinkerInputs)
+ CfgLinkerInputs = std::move(NewLinkerIns);
+ else {
+ // If this is a subsequent config file, append options to the previous one.
+ for (auto *Opt : *NewLinkerIns) {
+ const Arg *BaseArg = &Opt->getBaseArg();
+ if (BaseArg == Opt)
+ BaseArg = nullptr;
+ appendOneArg(*CfgLinkerInputs, Opt, BaseArg);
+ }
+ }
+
ConfigFiles.push_back(std::string(CfgFileName));
return false;
}
@@ -1250,6 +1273,7 @@ Compilation *Driver::BuildCompilation(ArrayRef<const char *> ArgList) {
if (!ContainsError)
ContainsError = loadConfigFiles();
bool HasConfigFile = !ContainsError && (CfgOptions.get() != nullptr);
+ bool HasConfigLinkerIn = !ContainsError && (CfgLinkerInputs.get() != nullptr);
// All arguments, from both config file and command line.
InputArgList Args = std::move(HasConfigFile ? std::move(*CfgOptions)
@@ -1552,6 +1576,15 @@ Compilation *Driver::BuildCompilation(ArrayRef<const char *> ArgList) {
// Construct the list of inputs.
InputList Inputs;
BuildInputs(C->getDefaultToolChain(), *TranslatedArgs, Inputs);
+ if (HasConfigLinkerIn && Inputs.size()) {
+ Arg *FinalPhaseArg;
+ if (getFinalPhase(*TranslatedArgs, &FinalPhaseArg) == phases::Link) {
+ DerivedArgList TranslatedLinkerIns(*CfgLinkerInputs);
+ for (Arg *A : *CfgLinkerInputs)
+ TranslatedLinkerIns.append(A);
+ BuildInputs(C->getDefaultToolChain(), TranslatedLinkerIns, Inputs);
+ }
+ }
// Populate the tool chains for the offloading devices, if any.
CreateOffloadingDeviceToolChains(*C, Inputs);
diff --git a/clang/test/Driver/Inputs/config-l.cfg b/clang/test/Driver/Inputs/config-l.cfg
new file mode 100644
index 00000000000000..853b179bd2da85
--- /dev/null
+++ b/clang/test/Driver/Inputs/config-l.cfg
@@ -0,0 +1 @@
+-Wall -lm -Wl,-Bstatic -lhappy -Wl,-Bdynamic
diff --git a/clang/test/Driver/config-file.c b/clang/test/Driver/config-file.c
index 9df830ca4c7538..21d1c23ee34369 100644
--- a/clang/test/Driver/config-file.c
+++ b/clang/test/Driver/config-file.c
@@ -82,3 +82,24 @@
// CHECK-TWO-CONFIGS: -isysroot
// CHECK-TWO-CONFIGS-SAME: /opt/data
// CHECK-TWO-CONFIGS-SAME: -Wall
+
+//--- The -l flags should be moved to the end of input list and appear only when linking.
+// RUN: %clang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -o %s.out %s -### 2>&1 | FileCheck %s -check-prefix CHECK-LINKING
+// RUN: %clang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -fopenmp -o %s.out %s -### 2>&1 | FileCheck %s -check-prefix CHECK-LINKING-LIBOMP-GOES-LAST
+// RUN: %clang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -S %s -### 2>&1 | FileCheck %s -check-prefix CHECK-NOLINKING
+// RUN: %clang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -fopenmp -S %s -### 2>&1 | FileCheck %s -check-prefix CHECK-NOLINKING
+// CHECK-LINKING: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
+// CHECK-LINKING: "-Wall"
+// CHECK-LINKING: "{{.*}}-{{.*}}.o" "-lm" "-Bstatic" "-lhappy" "-Bdynamic"
+// CHECK-LINKING-LIBOMP-GOES-LAST: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
+// CHECK-LINKING-LIBOMP-GOES-LAST: "-Wall"
+// CHECK-LINKING-LIBOMP-GOES-LAST-SAME: "-fopenmp"
+// CHECK-LINKING-LIBOMP-GOES-LAST: "{{.*}}-{{.*}}.o" "-lm" "-Bstatic" "-lhappy" "-Bdynamic"
+// CHECK-LINKING-LIBOMP-GOES-LAST-SAME: "-lomp"
+// CHECK-NOLINKING: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
+// CHECK-NOLINKING: "-Wall"
+// CHECK-NOLINKING-NO: "-lm"
+// CHECK-NOLINKING-NO: "-Bstatic"
+// CHECK-NOLINKING-NO: "-lhappy"
+// CHECK-NOLINKING-NO: "-Bdynamic"
+// CHECK-NOLINKING-NO: "-lomp"
diff --git a/flang/test/Driver/Inputs/config-l.cfg b/flang/test/Driver/Inputs/config-l.cfg
new file mode 100644
index 00000000000000..c18ee1cd16ec41
--- /dev/null
+++ b/flang/test/Driver/Inputs/config-l.cfg
@@ -0,0 +1 @@
+-ffast-math -lm -Wl,-Bstatic -lhappy -Wl,-Bdynamic
diff --git a/flang/test/Driver/config-file.f90 b/flang/test/Driver/config-file.f90
index 70316dd971f36b..e25fcf03224a80 100644
--- a/flang/test/Driver/config-file.f90
+++ b/flang/test/Driver/config-file.f90
@@ -61,3 +61,24 @@
! CHECK-TWO-CONFIGS-NEXT: Configuration file: {{.*}}Inputs{{.}}config2{{.}}config-4.cfg
! CHECK-TWO-CONFIGS: -ffp-contract=fast
! CHECK-TWO-CONFIGS: -O3
+
+!--- The -l flags should be moved to the end of input list and appear only when linking.
+! RUN: %flang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -o %s.out %s -### 2>&1 | FileCheck %s -check-prefix CHECK-LINKING
+! RUN: %flang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -fopenmp -o %s.out %s -### 2>&1 | FileCheck %s -check-prefix CHECK-LINKING-LIBOMP-GOES-LAST
+! RUN: %flang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -S %s -### 2>&1 | FileCheck %s -check-prefix CHECK-NOLINKING
+! RUN: %flang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -fopenmp -S %s -### 2>&1 | FileCheck %s -check-prefix CHECK-NOLINKING
+! CHECK-LINKING: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
+! CHECK-LINKING: "-ffast-math"
+! CHECK-LINKING: "{{.*}}-{{.*}}.o" "-lm" "-Bstatic" "-lhappy" "-Bdynamic"
+! CHECK-LINKING-LIBOMP-GOES-LAST: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
+! CHECK-LINKING-LIBOMP-GOES-LAST: "-ffast-math"
+! CHECK-LINKING-LIBOMP-GOES-LAST-SAME: "-fopenmp"
+! CHECK-LINKING-LIBOMP-GOES-LAST: "{{.*}}-{{.*}}.o" "-lm" "-Bstatic" "-lhappy" "-Bdynamic"
+! CHECK-LINKING-LIBOMP-GOES-LAST-SAME: "-lomp"
+! CHECK-NOLINKING: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
+! CHECK-NOLINKING: "-ffast-math"
+! CHECK-NOLINKING-NO: "-lm"
+! CHECK-NOLINKING-NO: "-Bstatic"
+! CHECK-NOLINKING-NO: "-lhappy"
+! CHECK-NOLINKING-NO: "-Bdynamic"
+! CHECK-NOLINKING-NO: "-lomp"
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