tstellar created this revision.
Fedora ships cross-compilers on all platforms, so a user could end up
with a gcc x86_64 cross-compiler installed on an x86_64 system. clang
maintains a list of supported triples for each target and when all
else is equal will prefer toolchains with triples that appear earlier
in the list.
The cross-compiler triple on Fedora is x86_64-linux-gnu and this comes
before the Fedora system compiler's triple: x86_64-redhat-linux in
the triples list, so the cross compiler is always preferred. This
is a problem, because the cross compiler is missing libraries, like
libgcc_s.so, that clang expects to be there so linker invocations
will fail.
This patch fixes this by checking for the existence of libgcc_s.so
when it is required and taking that into account when selecting a
toolchain.
Repository:
rC Clang
https://reviews.llvm.org/D52861
Files:
lib/Driver/ToolChains/Gnu.cpp
lib/Driver/ToolChains/Gnu.h
test/Driver/Inputs/fedora_28_tree/usr/lib/gcc/x86_64-linux-gnu/7/crtbegin.o
test/Driver/Inputs/fedora_28_tree/usr/lib/gcc/x86_64-redhat-linux/7/crtbegin.o
test/Driver/Inputs/fedora_28_tree/usr/lib/gcc/x86_64-redhat-linux/7/libgcc_s.so
test/Driver/linux-ld.c
Index: test/Driver/linux-ld.c
===================================================================
--- test/Driver/linux-ld.c
+++ test/Driver/linux-ld.c
@@ -717,6 +717,18 @@
// CHECK-FEDORA-21-AARCH64:
"{{.*}}/usr/lib/gcc/aarch64-redhat-linux/4.9.0{{/|\\\\}}crtend.o"
// CHECK-FEDORA-21-AARCH64:
"{{.*}}/usr/lib/gcc/aarch64-redhat-linux/4.9.0/../../../../lib64{{/|\\\\}}crtn.o"
//
+// Check that clang does not select the cross compiler by default on Fedora 28.
+//
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN: --target=x86_64-unknown-linux-gnu \
+// RUN: --gcc-toolchain="" \
+// RUN: --sysroot=%S/Inputs/fedora_28_tree \
+// RUN: | FileCheck --check-prefix=CHECK-FEDORA-28-X86_64 %s
+//
+// CHECK-FEDORA-28-X86_64: "{{.*}}ld{{(.exe)?}}" "--sysroot=[[SYSROOT:[^"]+]]"
+// CHECK-FEDORA-28-X86_64:
"[[SYSROOT]]/usr/lib/gcc/x86_64-redhat-linux/7/crtbegin.o"
+// CHECK-FEDORA-28-X86_64: "-L[[SYSROOT]]/usr/lib/gcc/x86_64-redhat-linux/7"
+//
// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
// RUN: --target=arm-unknown-linux-gnueabi \
// RUN: --gcc-toolchain="" \
Index: lib/Driver/ToolChains/Gnu.h
===================================================================
--- lib/Driver/ToolChains/Gnu.h
+++ lib/Driver/ToolChains/Gnu.h
@@ -186,6 +186,7 @@
/// Driver, and has logic for fuzzing that where appropriate.
class GCCInstallationDetector {
bool IsValid;
+ bool HasLibGccShared;
llvm::Triple GCCTriple;
const Driver &D;
@@ -209,7 +210,8 @@
MultilibSet Multilibs;
public:
- explicit GCCInstallationDetector(const Driver &D) : IsValid(false), D(D) {}
+ explicit GCCInstallationDetector(const Driver &D)
+ : IsValid(false), HasLibGccShared(false), D(D) {}
void init(const llvm::Triple &TargetTriple, const llvm::opt::ArgList &Args,
ArrayRef<std::string> ExtraTripleAliases = None);
Index: lib/Driver/ToolChains/Gnu.cpp
===================================================================
--- lib/Driver/ToolChains/Gnu.cpp
+++ lib/Driver/ToolChains/Gnu.cpp
@@ -2199,6 +2199,8 @@
(TargetArch == llvm::Triple::x86 &&
TargetTriple.getOS() != llvm::Triple::Solaris)}};
+ bool NeedLibgccShared = !Args.hasArg(options::OPT_static_libgcc) &&
+ !Args.hasArg(options::OPT_static);
for (auto &Suffix : Suffixes) {
if (!Suffix.Active)
continue;
@@ -2216,8 +2218,17 @@
continue; // Saw this path before; no need to look at it again.
if (CandidateVersion.isOlderThan(4, 1, 1))
continue;
- if (CandidateVersion <= Version)
- continue;
+
+ bool CandidateHasLibGccShared = false;
+ if (CandidateVersion <= Version) {
+ if (NeedLibgccShared && !HasLibGccShared) {
+ CandidateHasLibGccShared =
+ D.getVFS().exists(LI->path() + "/libgcc_s.so");
+
+ }
+ if (HasLibGccShared || !CandidateHasLibGccShared)
+ continue;
+ }
if (!ScanGCCForMultilibs(TargetTriple, Args, LI->path(),
NeedsBiarchSuffix))
@@ -2231,6 +2242,7 @@
GCCInstallPath = (LibDir + "/" + LibSuffix + "/" + VersionText).str();
GCCParentLibPath = (GCCInstallPath + "/../" + Suffix.ReversePath).str();
IsValid = true;
+ HasLibGccShared = CandidateHasLibGccShared;
}
}
}
Index: test/Driver/linux-ld.c
===================================================================
--- test/Driver/linux-ld.c
+++ test/Driver/linux-ld.c
@@ -717,6 +717,18 @@
// CHECK-FEDORA-21-AARCH64: "{{.*}}/usr/lib/gcc/aarch64-redhat-linux/4.9.0{{/|\\\\}}crtend.o"
// CHECK-FEDORA-21-AARCH64: "{{.*}}/usr/lib/gcc/aarch64-redhat-linux/4.9.0/../../../../lib64{{/|\\\\}}crtn.o"
//
+// Check that clang does not select the cross compiler by default on Fedora 28.
+//
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN: --target=x86_64-unknown-linux-gnu \
+// RUN: --gcc-toolchain="" \
+// RUN: --sysroot=%S/Inputs/fedora_28_tree \
+// RUN: | FileCheck --check-prefix=CHECK-FEDORA-28-X86_64 %s
+//
+// CHECK-FEDORA-28-X86_64: "{{.*}}ld{{(.exe)?}}" "--sysroot=[[SYSROOT:[^"]+]]"
+// CHECK-FEDORA-28-X86_64: "[[SYSROOT]]/usr/lib/gcc/x86_64-redhat-linux/7/crtbegin.o"
+// CHECK-FEDORA-28-X86_64: "-L[[SYSROOT]]/usr/lib/gcc/x86_64-redhat-linux/7"
+//
// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
// RUN: --target=arm-unknown-linux-gnueabi \
// RUN: --gcc-toolchain="" \
Index: lib/Driver/ToolChains/Gnu.h
===================================================================
--- lib/Driver/ToolChains/Gnu.h
+++ lib/Driver/ToolChains/Gnu.h
@@ -186,6 +186,7 @@
/// Driver, and has logic for fuzzing that where appropriate.
class GCCInstallationDetector {
bool IsValid;
+ bool HasLibGccShared;
llvm::Triple GCCTriple;
const Driver &D;
@@ -209,7 +210,8 @@
MultilibSet Multilibs;
public:
- explicit GCCInstallationDetector(const Driver &D) : IsValid(false), D(D) {}
+ explicit GCCInstallationDetector(const Driver &D)
+ : IsValid(false), HasLibGccShared(false), D(D) {}
void init(const llvm::Triple &TargetTriple, const llvm::opt::ArgList &Args,
ArrayRef<std::string> ExtraTripleAliases = None);
Index: lib/Driver/ToolChains/Gnu.cpp
===================================================================
--- lib/Driver/ToolChains/Gnu.cpp
+++ lib/Driver/ToolChains/Gnu.cpp
@@ -2199,6 +2199,8 @@
(TargetArch == llvm::Triple::x86 &&
TargetTriple.getOS() != llvm::Triple::Solaris)}};
+ bool NeedLibgccShared = !Args.hasArg(options::OPT_static_libgcc) &&
+ !Args.hasArg(options::OPT_static);
for (auto &Suffix : Suffixes) {
if (!Suffix.Active)
continue;
@@ -2216,8 +2218,17 @@
continue; // Saw this path before; no need to look at it again.
if (CandidateVersion.isOlderThan(4, 1, 1))
continue;
- if (CandidateVersion <= Version)
- continue;
+
+ bool CandidateHasLibGccShared = false;
+ if (CandidateVersion <= Version) {
+ if (NeedLibgccShared && !HasLibGccShared) {
+ CandidateHasLibGccShared =
+ D.getVFS().exists(LI->path() + "/libgcc_s.so");
+
+ }
+ if (HasLibGccShared || !CandidateHasLibGccShared)
+ continue;
+ }
if (!ScanGCCForMultilibs(TargetTriple, Args, LI->path(),
NeedsBiarchSuffix))
@@ -2231,6 +2242,7 @@
GCCInstallPath = (LibDir + "/" + LibSuffix + "/" + VersionText).str();
GCCParentLibPath = (GCCInstallPath + "/../" + Suffix.ReversePath).str();
IsValid = true;
+ HasLibGccShared = CandidateHasLibGccShared;
}
}
}
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