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[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 attempts to solve both of the problems, by allowing a split of the arguments list into two parts. The head part of the list will be used as before, but the tail part will be appended after the command line flags provided by the user and only when it is known that the linking should occur. The ^-prefixed arguments will be added to the tail part.
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‎clang/include/clang/Driver/Driver.h

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -297,6 +297,9 @@ class Driver {
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/// Object that stores strings read from configuration file.
298298
llvm::StringSaver Saver;
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300+
/// Linker inputs originated from configuration file.
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std::unique_ptr<llvm::opt::InputArgList> CfgLinkerInputs;
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300303
/// Arguments originated from configuration file.
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std::unique_ptr<llvm::opt::InputArgList> CfgOptions;
302305

‎clang/lib/Driver/Driver.cpp

Lines changed: 43 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -1039,34 +1039,59 @@ bool Driver::readConfigFile(StringRef FileName,
10391039
}
10401040

10411041
// Try reading the given file.
1042-
SmallVector<const char *, 32> NewCfgArgs;
1043-
if (llvm::Error Err = ExpCtx.readConfigFile(FileName, NewCfgArgs)) {
1042+
SmallVector<const char *, 32> NewCfgFileArgs;
1043+
if (llvm::Error Err = ExpCtx.readConfigFile(FileName, NewCfgFileArgs)) {
10441044
Diag(diag::err_drv_cannot_read_config_file)
10451045
<< FileName << toString(std::move(Err));
10461046
return true;
10471047
}
10481048

1049+
// Populate head and tail lists. The tail list is used only when linking.
1050+
SmallVector<const char *, 32> NewCfgHeadArgs, NewCfgTailArgs;
1051+
for (const char *Opt : NewCfgFileArgs) {
1052+
// An ^-prefixed option should go to the tail list.
1053+
if (Opt[0] == '^' && Opt[1])
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NewCfgTailArgs.push_back(Opt + 1);
1055+
else
1056+
NewCfgHeadArgs.push_back(Opt);
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}
1058+
10491059
// Read options from config file.
10501060
llvm::SmallString<128> CfgFileName(FileName);
10511061
llvm::sys::path::native(CfgFileName);
1052-
bool ContainErrors;
1053-
auto NewOptions = std::make_unique<InputArgList>(
1054-
ParseArgStrings(NewCfgArgs, /*UseDriverMode=*/true, ContainErrors));
1062+
bool ContainErrors = false;
1063+
auto NewHeadOptions = std::make_unique<InputArgList>(
1064+
ParseArgStrings(NewCfgHeadArgs, /*UseDriverMode=*/true, ContainErrors));
1065+
if (ContainErrors)
1066+
return true;
1067+
auto NewTailOptions = std::make_unique<InputArgList>(
1068+
ParseArgStrings(NewCfgTailArgs, /*UseDriverMode=*/true, ContainErrors));
10551069
if (ContainErrors)
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return true;
10571071

10581072
// Claim all arguments that come from a configuration file so that the driver
10591073
// does not warn on any that is unused.
1060-
for (Arg *A : *NewOptions)
1074+
for (Arg *A : *NewHeadOptions)
1075+
A->claim();
1076+
for (Arg *A : *NewTailOptions)
10611077
A->claim();
10621078

10631079
if (!CfgOptions)
1064-
CfgOptions = std::move(NewOptions);
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CfgOptions = std::move(NewHeadOptions);
10651081
else {
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// If this is a subsequent config file, append options to the previous one.
1067-
for (auto *Opt : *NewOptions)
1083+
for (auto *Opt : *NewHeadOptions)
10681084
appendOneArg(*CfgOptions, Opt);
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}
1086+
1087+
if (!CfgLinkerInputs)
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CfgLinkerInputs = std::move(NewTailOptions);
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else {
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// If this is a subsequent config file, append options to the previous one.
1091+
for (auto *Opt : *NewTailOptions)
1092+
appendOneArg(*CfgLinkerInputs, Opt);
1093+
}
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10701095
ConfigFiles.push_back(std::string(CfgFileName));
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return false;
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}
@@ -1244,6 +1269,7 @@ Compilation *Driver::BuildCompilation(ArrayRef<const char *> ArgList) {
12441269
if (!ContainsError)
12451270
ContainsError = loadConfigFiles();
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bool HasConfigFile = !ContainsError && (CfgOptions.get() != nullptr);
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bool HasConfigLinkerIn = !ContainsError && CfgLinkerInputs;
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12481274
// All arguments, from both config file and command line.
12491275
InputArgList Args = std::move(HasConfigFile ? std::move(*CfgOptions)
@@ -1540,6 +1566,15 @@ Compilation *Driver::BuildCompilation(ArrayRef<const char *> ArgList) {
15401566
// Construct the list of inputs.
15411567
InputList Inputs;
15421568
BuildInputs(C->getDefaultToolChain(), *TranslatedArgs, Inputs);
1569+
if (HasConfigLinkerIn && Inputs.size()) {
1570+
Arg *FinalPhaseArg;
1571+
if (getFinalPhase(*TranslatedArgs, &FinalPhaseArg) == phases::Link) {
1572+
DerivedArgList TranslatedLinkerIns(*CfgLinkerInputs);
1573+
for (Arg *A : *CfgLinkerInputs)
1574+
TranslatedLinkerIns.append(A);
1575+
BuildInputs(C->getDefaultToolChain(), TranslatedLinkerIns, Inputs);
1576+
}
1577+
}
15431578

15441579
// Populate the tool chains for the offloading devices, if any.
15451580
CreateOffloadingDeviceToolChains(*C, Inputs);

‎clang/test/Driver/Inputs/config-l.cfg

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,3 @@
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-Wall ^-lm
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-Wl,--as-needed ^-Wl,-Bstatic
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^-lhappy ^-Wl,-Bdynamic

‎clang/test/Driver/config-file.c

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Original file line numberDiff line numberDiff line change
@@ -82,3 +82,29 @@
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// CHECK-TWO-CONFIGS: -isysroot
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// CHECK-TWO-CONFIGS-SAME: /opt/data
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// CHECK-TWO-CONFIGS-SAME: -Wall
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//--- The linker input flags should be moved to the end of input list and appear only when linking.
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// RUN: %clang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg %s -lmylib -Wl,foo.a -### 2>&1 | FileCheck %s -check-prefix CHECK-LINKING
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// RUN: %clang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -fopenmp %s -lmylib -Wl,foo.a -### 2>&1 | FileCheck %s -check-prefix CHECK-LINKING-LIBOMP-GOES-LAST
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// RUN: %clang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -S %s -### 2>&1 | FileCheck %s -check-prefix CHECK-NOLINKING
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// RUN: %clang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -fopenmp -S %s -### 2>&1 | FileCheck %s -check-prefix CHECK-NOLINKING-OPENMP
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// RUN: %clang --target=x86_64-pc-windows-msvc --config %S/Inputs/config-l.cfg %s -lmylib -Wl,foo.lib -### 2>&1 | FileCheck %s -check-prefix CHECK-LINKING-MSVC
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// RUN: %clang --target=x86_64-pc-windows-msvc --config %S/Inputs/config-l.cfg -S %s -### 2>&1 | FileCheck %s -check-prefix CHECK-NOLINKING-MSVC
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// CHECK-LINKING: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
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// CHECK-LINKING: "-Wall"
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// CHECK-LINKING: "--as-needed" "{{.*}}-{{.*}}.o" "-lmylib" "foo.a" "-lm" "-Bstatic" "-lhappy" "-Bdynamic"
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// CHECK-LINKING-LIBOMP-GOES-LAST: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
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// CHECK-LINKING-LIBOMP-GOES-LAST: "-Wall" {{.*}}"-fopenmp"
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// CHECK-LINKING-LIBOMP-GOES-LAST: "--as-needed" "{{.*}}-{{.*}}.o" "-lmylib" "foo.a" "-lm" "-Bstatic" "-lhappy" "-Bdynamic" {{.*}}"-lomp"
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// CHECK-NOLINKING: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
100+
// CHECK-NOLINKING: "-Wall"
101+
// CHECK-NOLINKING-NO: "-lm" "-Bstatic" "-lhappy" "-Bdynamic"
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// CHECK-NOLINKING-OPENMP: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
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// CHECK-NOLINKING-OPENMP: "-Wall" {{.*}}"-fopenmp"
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// CHECK-NOLINKING-OPENMP-NO: "-lm" "-Bstatic" "-lhappy" "-Bdynamic" {{.*}}"-lomp"
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// CHECK-LINKING-MSVC: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
106+
// CHECK-LINKING-MSVC: "-Wall"
107+
// CHECK-LINKING-MSVC: "--as-needed" "{{.*}}-{{.*}}.o" "mylib.lib" "foo.lib" "m.lib" "-Bstatic" "happy.lib" "-Bdynamic"
108+
// CHECK-NOLINKING-MSVC: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
109+
// CHECK-NOLINKING-MSVC: "-Wall"
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// CHECK-NOLINKING-MSVC-NO: "m.lib" "-Bstatic" "happy.lib" "-Bdynamic"

‎flang/test/Driver/Inputs/config-l.cfg

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,3 @@
1+
-ffast-math ^-lm
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-Wl,--as-needed ^-Wl,-Bstatic
3+
^-lhappy ^-Wl,-Bdynamic

‎flang/test/Driver/config-file.f90

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@@ -61,3 +61,29 @@
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! CHECK-TWO-CONFIGS-NEXT: Configuration file: {{.*}}Inputs{{.}}config2{{.}}config-4.cfg
6262
! CHECK-TWO-CONFIGS: -ffp-contract=fast
6363
! CHECK-TWO-CONFIGS: -O3
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65+
!--- The linker input flags should be moved to the end of input list and appear only when linking.
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! RUN: %flang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg %s -lmylib -Wl,foo.a -### 2>&1 | FileCheck %s -check-prefix CHECK-LINKING
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! RUN: %flang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -fopenmp %s -lmylib -Wl,foo.a -### 2>&1 | FileCheck %s -check-prefix CHECK-LINKING-LIBOMP-GOES-LAST
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! RUN: %flang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -S %s -### 2>&1 | FileCheck %s -check-prefix CHECK-NOLINKING
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! RUN: %flang --target=aarch64-unknown-linux-gnu --config %S/Inputs/config-l.cfg -fopenmp -S %s -### 2>&1 | FileCheck %s -check-prefix CHECK-NOLINKING-OPENMP
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! RUN: %flang --target=x86_64-pc-windows-msvc --config %S/Inputs/config-l.cfg %s -lmylib -Wl,foo.lib -### 2>&1 | FileCheck %s -check-prefix CHECK-LINKING-MSVC
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! RUN: %flang --target=x86_64-pc-windows-msvc --config %S/Inputs/config-l.cfg -S %s -### 2>&1 | FileCheck %s -check-prefix CHECK-NOLINKING-MSVC
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! CHECK-LINKING: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
73+
! CHECK-LINKING: "-ffast-math"
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! CHECK-LINKING: "--as-needed" "{{.*}}-{{.*}}.o" "-lmylib" "foo.a" "-lm" "-Bstatic" "-lhappy" "-Bdynamic"
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! CHECK-LINKING-LIBOMP-GOES-LAST: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
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! CHECK-LINKING-LIBOMP-GOES-LAST: "-ffast-math" {{.*}}"-fopenmp"
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! CHECK-LINKING-LIBOMP-GOES-LAST: "--as-needed" "{{.*}}-{{.*}}.o" "-lmylib" "foo.a" "-lm" "-Bstatic" "-lhappy" "-Bdynamic" {{.*}}"-lomp"
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! CHECK-NOLINKING: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
79+
! CHECK-NOLINKING: "-ffast-math"
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! CHECK-NOLINKING-NO: "-lm" "-Bstatic" "-lhappy" "-Bdynamic"
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! CHECK-NOLINKING-OPENMP: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
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! CHECK-NOLINKING-OPENMP: "-ffast-math" {{.*}}"-fopenmp"
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! CHECK-NOLINKING-OPENMP-NO: "-lm" "-Bstatic" "-lhappy" "-Bdynamic" {{.}}"-lomp"
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! CHECK-LINKING-MSVC: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
85+
! CHECK-LINKING-MSVC: "-ffast-math"
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! CHECK-LINKING-MSVC: "--as-needed" "{{.*}}-{{.*}}.o" "mylib.lib" "foo.lib" "m.lib" "-Bstatic" "happy.lib" "-Bdynamic"
87+
! CHECK-NOLINKING-MSVC: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
88+
! CHECK-NOLINKING-MSVC: "-ffast-math"
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! CHECK-NOLINKING-MSVC-NO: "m.lib" "-Bstatic" "happy.lib" "-Bdynamic"

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