https://github.com/luporl created
https://github.com/llvm/llvm-project/pull/77365
If DEFAULT_SYSROOT is not specfied when building flang, then the
-isysroot flag is needed to link binaries against system libraries
on Darwin. It's also needed when linking against a non-default
sysroot.
>From 01a2a8d315af2edb9fe3f0c9b57b5c74935521f1 Mon Sep 17 00:00:00 2001
From: Leandro Lupori <leandro.lup...@linaro.org>
Date: Mon, 8 Jan 2024 16:37:54 -0300
Subject: [PATCH] [flang][driver] Add support for -isysroot in the frontend
If DEFAULT_SYSROOT is not specfied when building flang, then the
-isysroot flag is needed to link binaries against system libraries
on Darwin. It's also needed when linking against a non-default
sysroot.
---
clang/include/clang/Driver/Options.td | 2 +-
flang/test/Driver/driver-help-hidden.f90 | 1 +
flang/test/Driver/driver-help.f90 | 1 +
flang/test/Driver/isysroot.f90 | 12 ++++++++++++
4 files changed, 15 insertions(+), 1 deletion(-)
create mode 100644 flang/test/Driver/isysroot.f90
diff --git a/clang/include/clang/Driver/Options.td
b/clang/include/clang/Driver/Options.td
index 6aff37f1336871..f42e9c7eb92a67 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -4265,7 +4265,7 @@ def iquote : JoinedOrSeparate<["-"], "iquote">,
Group<clang_i_Group>,
Visibility<[ClangOption, CC1Option]>,
HelpText<"Add directory to QUOTE include search path">,
MetaVarName<"<directory>">;
def isysroot : JoinedOrSeparate<["-"], "isysroot">, Group<clang_i_Group>,
- Visibility<[ClangOption, CC1Option]>,
+ Visibility<[ClangOption, CC1Option, FlangOption]>,
HelpText<"Set the system root directory (usually /)">, MetaVarName<"<dir>">,
MarshallingInfoString<HeaderSearchOpts<"Sysroot">, [{"/"}]>;
def isystem : JoinedOrSeparate<["-"], "isystem">, Group<clang_i_Group>,
diff --git a/flang/test/Driver/driver-help-hidden.f90
b/flang/test/Driver/driver-help-hidden.f90
index 9a11a7a571ffcc..a4444ca043d0ea 100644
--- a/flang/test/Driver/driver-help-hidden.f90
+++ b/flang/test/Driver/driver-help-hidden.f90
@@ -111,6 +111,7 @@
! CHECK-NEXT: -g Generate source-level debug information
! CHECK-NEXT: --help-hidden Display help for hidden options
! CHECK-NEXT: -help Display available options
+! CHECK-NEXT: -isysroot <dir> Set the system root directory (usually /)
! CHECK-NEXT: -I <dir> Add directory to the end of the list of
include search paths
! CHECK-NEXT: -L <dir> Add directory to library search path
! CHECK-NEXT: -march=<value> For a list of available architectures
for the target use '-mcpu=help'
diff --git a/flang/test/Driver/driver-help.f90
b/flang/test/Driver/driver-help.f90
index e0e74dc56f331e..07189264104592 100644
--- a/flang/test/Driver/driver-help.f90
+++ b/flang/test/Driver/driver-help.f90
@@ -97,6 +97,7 @@
! HELP-NEXT: -g Generate source-level debug information
! HELP-NEXT: --help-hidden Display help for hidden options
! HELP-NEXT: -help Display available options
+! HELP-NEXT: -isysroot <dir> Set the system root directory (usually /)
! HELP-NEXT: -I <dir> Add directory to the end of the list of
include search paths
! HELP-NEXT: -L <dir> Add directory to library search path
! HELP-NEXT: -march=<value> For a list of available architectures for
the target use '-mcpu=help'
diff --git a/flang/test/Driver/isysroot.f90 b/flang/test/Driver/isysroot.f90
new file mode 100644
index 00000000000000..70d2fc0345ce50
--- /dev/null
+++ b/flang/test/Driver/isysroot.f90
@@ -0,0 +1,12 @@
+! Verify that the -isysroot flag is known to the frontend and, on Darwin,
+! is passed on to the linker.
+
+! RUN: %flang -### --target=aarch64-apple-darwin -isysroot /path/to/sysroot \
+! RUN: %s 2>&1 | FileCheck %s --check-prefix=CHECK-DARWIN
+! RUN: %flang -### --target=aarch64-linux-gnu -isysroot /path/to/sysroot \
+! RUN: %s 2>&1 | FileCheck %s --check-prefix=CHECK-LINUX
+
+! CHECK-DARWIN: "{{.*}}/ld" {{.*}}"-syslibroot" "/path/to/sysroot"
+! Unused on Linux.
+! CHECK-LINUX: warning: argument unused during compilation: '-isysroot
/path/to/sysroot'
+! CHECK-LINUX-NOT: /path/to/sysroot
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