[Clang] Link libgcc_s.1.dylib when building for macOS 10.5 and older #141401
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@llvm/pr-subscribers-clang Author: None (Un1q32) ChangesThere are a lot of symbols that were moved from libgcc_s into libSystem in 10.6, like libunwind and some builtins. We already do this for iOS versions < 5.0 for the same reason. This matches the behavior of the version of GCC shipped with Xcode before Apple switched entirely to Clang. Full diff: https://github.com/llvm/llvm-project/pull/141401.diff 2 Files Affected:
diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index 452820159435f..ddc066d3d18a3 100644
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -1645,14 +1645,15 @@ void DarwinClang::AddLinkRuntimeLibArgs(const ArgList &Args,
CmdArgs.push_back("-lSystem");
// Select the dynamic runtime library and the target specific static library.
- if (isTargetIOSBased()) {
- // If we are compiling as iOS / simulator, don't attempt to link libgcc_s.1,
- // it never went into the SDK.
- // Linking against libgcc_s.1 isn't needed for iOS 5.0+
- if (isIPhoneOSVersionLT(5, 0) && !isTargetIOSSimulator() &&
- getTriple().getArch() != llvm::Triple::aarch64)
- CmdArgs.push_back("-lgcc_s.1");
- }
+ // If we are compiling as iOS / simulator, don't attempt to link libgcc_s.1,
+ // it never went into the SDK.
+ // Linking against libgcc_s.1 isn't needed for iOS 5.0+ or macOS 10.6+
+ if (isTargetIOSBased() && isIPhoneOSVersionLT(5, 0) &&
+ !isTargetIOSSimulator() && getTriple().getArch() != llvm::Triple::aarch64)
+ CmdArgs.push_back("-lgcc_s.1");
+ else if (isTargetMacOSBased() && isMacosxVersionLT(10, 6) &&
+ getTriple().getArch() != llvm::Triple::aarch64)
+ CmdArgs.push_back("-lgcc_s.1");
AddLinkRuntimeLib(Args, CmdArgs, "builtins");
}
diff --git a/clang/test/Driver/darwin-ld.c b/clang/test/Driver/darwin-ld.c
index f0ca411430cc7..9a8d98cdb9c2c 100644
--- a/clang/test/Driver/darwin-ld.c
+++ b/clang/test/Driver/darwin-ld.c
@@ -240,6 +240,15 @@
// RUN: FileCheck -check-prefix=LINK_NO_IOS_ARM64_LIBGCC_S %s < %t.log
// LINK_NO_IOS_ARM64_LIBGCC_S-NOT: lgcc_s.1
+// Check that clang links with libgcc_s.1 for Mac OS X 10.5 and earlier, but not arm64
+// RUN: %clang -target x86_64-apple-macosx10.5 -mmacosx-version-min=10.5 -### %t.o 2> %t.log
+// RUN: FileCheck -check-prefix=LINK_OSX_LIBGCC_S %s < %t.log
+// LINK_OSX_LIBGCC_S: lgcc_s.1
+
+// RUN: %clang -target arm64-apple-macosx10.5 -mmacosx-version-min=10.5 -### %t.o 2> %t.log
+// RUN: FileCheck -check-prefix=LINK_NO_OSX_ARM64_LIBGCC_S %s < %t.log
+// LINK_NO_OSX_ARM64_LIBGCC_S-NOT: lgcc_s.1
+
// RUN: %clang -target x86_64-apple-darwin12 -rdynamic -### %t.o \
// RUN: -fuse-ld= -mlinker-version=100 2> %t.log
// RUN: FileCheck -check-prefix=LINK_NO_EXPORT_DYNAMIC %s < %t.log
@@ -385,4 +394,4 @@
// RUN: %clang -target armv7em-apple-darwin -mno-outline -### %t.o 2> %t.log
// RUN: FileCheck -check-prefix=ARMV7EM-MNO_OUTLINE %s < %t.log
// ARMV7EM-MNO_OUTLINE: {{ld(.exe)?"}}
-// ARMV7EM-MNO_OUTLINE-SAME: "-mllvm" "-enable-machine-outliner=never" "-mllvm" "-enable-linkonceodr-outlining"
\ No newline at end of file
+// ARMV7EM-MNO_OUTLINE-SAME: "-mllvm" "-enable-machine-outliner=never" "-mllvm" "-enable-linkonceodr-outlining"
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Member
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@llvm/pr-subscribers-clang-driver Author: None (Un1q32) ChangesThere are a lot of symbols that were moved from libgcc_s into libSystem in 10.6, like libunwind and some builtins. We already do this for iOS versions < 5.0 for the same reason. This matches the behavior of the version of GCC shipped with Xcode before Apple switched entirely to Clang. Full diff: https://github.com/llvm/llvm-project/pull/141401.diff 2 Files Affected:
diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index 452820159435f..ddc066d3d18a3 100644
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -1645,14 +1645,15 @@ void DarwinClang::AddLinkRuntimeLibArgs(const ArgList &Args,
CmdArgs.push_back("-lSystem");
// Select the dynamic runtime library and the target specific static library.
- if (isTargetIOSBased()) {
- // If we are compiling as iOS / simulator, don't attempt to link libgcc_s.1,
- // it never went into the SDK.
- // Linking against libgcc_s.1 isn't needed for iOS 5.0+
- if (isIPhoneOSVersionLT(5, 0) && !isTargetIOSSimulator() &&
- getTriple().getArch() != llvm::Triple::aarch64)
- CmdArgs.push_back("-lgcc_s.1");
- }
+ // If we are compiling as iOS / simulator, don't attempt to link libgcc_s.1,
+ // it never went into the SDK.
+ // Linking against libgcc_s.1 isn't needed for iOS 5.0+ or macOS 10.6+
+ if (isTargetIOSBased() && isIPhoneOSVersionLT(5, 0) &&
+ !isTargetIOSSimulator() && getTriple().getArch() != llvm::Triple::aarch64)
+ CmdArgs.push_back("-lgcc_s.1");
+ else if (isTargetMacOSBased() && isMacosxVersionLT(10, 6) &&
+ getTriple().getArch() != llvm::Triple::aarch64)
+ CmdArgs.push_back("-lgcc_s.1");
AddLinkRuntimeLib(Args, CmdArgs, "builtins");
}
diff --git a/clang/test/Driver/darwin-ld.c b/clang/test/Driver/darwin-ld.c
index f0ca411430cc7..9a8d98cdb9c2c 100644
--- a/clang/test/Driver/darwin-ld.c
+++ b/clang/test/Driver/darwin-ld.c
@@ -240,6 +240,15 @@
// RUN: FileCheck -check-prefix=LINK_NO_IOS_ARM64_LIBGCC_S %s < %t.log
// LINK_NO_IOS_ARM64_LIBGCC_S-NOT: lgcc_s.1
+// Check that clang links with libgcc_s.1 for Mac OS X 10.5 and earlier, but not arm64
+// RUN: %clang -target x86_64-apple-macosx10.5 -mmacosx-version-min=10.5 -### %t.o 2> %t.log
+// RUN: FileCheck -check-prefix=LINK_OSX_LIBGCC_S %s < %t.log
+// LINK_OSX_LIBGCC_S: lgcc_s.1
+
+// RUN: %clang -target arm64-apple-macosx10.5 -mmacosx-version-min=10.5 -### %t.o 2> %t.log
+// RUN: FileCheck -check-prefix=LINK_NO_OSX_ARM64_LIBGCC_S %s < %t.log
+// LINK_NO_OSX_ARM64_LIBGCC_S-NOT: lgcc_s.1
+
// RUN: %clang -target x86_64-apple-darwin12 -rdynamic -### %t.o \
// RUN: -fuse-ld= -mlinker-version=100 2> %t.log
// RUN: FileCheck -check-prefix=LINK_NO_EXPORT_DYNAMIC %s < %t.log
@@ -385,4 +394,4 @@
// RUN: %clang -target armv7em-apple-darwin -mno-outline -### %t.o 2> %t.log
// RUN: FileCheck -check-prefix=ARMV7EM-MNO_OUTLINE %s < %t.log
// ARMV7EM-MNO_OUTLINE: {{ld(.exe)?"}}
-// ARMV7EM-MNO_OUTLINE-SAME: "-mllvm" "-enable-machine-outliner=never" "-mllvm" "-enable-linkonceodr-outlining"
\ No newline at end of file
+// ARMV7EM-MNO_OUTLINE-SAME: "-mllvm" "-enable-machine-outliner=never" "-mllvm" "-enable-linkonceodr-outlining"
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carlocab
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carlocab
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Jun 4, 2025
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carlocab
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Seems reasonable to me, but someone from Apple should probably be the one to ✅ this.
carlocab
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Jun 4, 2025
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cachemeifyoucan
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cachemeifyoucan
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Function wise, LGTM.
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I don't have merge access BTW, there seems to be confusion about that whenever I made a PR here. |
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/18/builds/17216 Here is the relevant piece of the build log for the reference |
Collaborator
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/24/builds/9304 Here is the relevant piece of the build log for the reference |
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There are a lot of symbols that were moved from libgcc_s into libSystem in 10.6, like libunwind and some builtins. We already do this for iOS versions < 5.0 for the same reason. This matches the behavior of the version of GCC shipped with Xcode before Apple switched entirely to Clang.