https://github.com/stephanosio created
https://github.com/llvm/llvm-project/pull/112703
When multiple space-separated compile flags are specified in an
`ADDITIONAL_COMPILE_FLAGS` cache string, the resulting flags are enclosed by
double quotes because `ADDITIONAL_COMPILE_FLAGS` is a string (i.e. not a list)
and CMake `target_compile_options` treats the multiple space-separated
arguments as single argument containing spaces.
For example, when libcxx is configured with the following multiple
space-separated additional compile flags:
cmake ... "-DLIBCXX_ADDITIONAL_COMPILE_FLAGS=--flag1 --flag2" ...
The resulting compiler command line is as follows:
cc ... "--flag1 --flag2" ...
The above can be problematic for some compilers -- for instance, GCC treats it
as a file path and prints out an error.
This patch, by calling `separate_arguments` on
`ADDITIONAL_COMPILE_FLAGS` to convert it into the standard semicolon-separated
list form, which is properly handled by `target_compile_options`, ensures that
multiple compile flags are handled as such.
With this change, the resulting compiler command line is as follows:
cc ... --flag1 --flag2 ...
>From 3763d810e4cb248285a56f1491162a95ebf482f8 Mon Sep 17 00:00:00 2001
From: Stephanos Ioannidis <r...@stephanos.io>
Date: Thu, 17 Oct 2024 20:55:11 +0900
Subject: [PATCH] [CMake] Handle multiple flags in ADDITIONAL_COMPILE_FLAGS
properly
When multiple space-separated compile flags are specified in an
`ADDITIONAL_COMPILE_FLAGS` cache string, the resulting flags are
enclosed by double quotes because `ADDITIONAL_COMPILE_FLAGS` is a
string (i.e. not a list) and CMake `target_compile_options` treats the
multiple space-separated arguments as single argument containing spaces.
For example, when libcxx is configured with the following multiple
space-separated additional compile flags:
cmake ... "-DLIBCXX_ADDITIONAL_COMPILE_FLAGS=--flag1 --flag2" ...
The resulting compiler command line is as follows:
cc ... "--flag1 --flag2" ...
The above can be problematic for some compilers -- for instance, GCC
treats it as a file path and prints out an error.
This patch, by calling `separate_arguments` on
`ADDITIONAL_COMPILE_FLAGS` to convert it into the standard
semicolon-separated list form, which is properly handled by
`target_compile_options`, ensures that multiple compile flags are
handled as such.
With this change, the resulting compiler command line is as follows:
cc ... --flag1 --flag2 ...
Signed-off-by: Stephanos Ioannidis <r...@stephanos.io>
---
libcxx/CMakeLists.txt | 3 ++-
libcxxabi/CMakeLists.txt | 1 +
libcxxabi/src/CMakeLists.txt | 4 ++--
libunwind/CMakeLists.txt | 1 +
libunwind/src/CMakeLists.txt | 4 ++--
5 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
index 75c926f5432aea..f9cdeaa0fe84b6 100644
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -460,6 +460,7 @@ set(LIBCXX_LINK_FLAGS "")
set(LIBCXX_LIBRARIES "")
set(LIBCXX_ADDITIONAL_COMPILE_FLAGS "" CACHE STRING
"Additional Compile only flags which can be provided in cache")
+separate_arguments(LIBCXX_ADDITIONAL_COMPILE_FLAGS)
set(LIBCXX_ADDITIONAL_LIBRARIES "" CACHE STRING
"Additional libraries libc++ is linked to which can be provided in cache")
@@ -549,7 +550,7 @@ function(cxx_add_basic_build_flags target)
target_compile_definitions(${target} PRIVATE -D_LIBCPP_LINK_RT_LIB)
endif()
endif()
- target_compile_options(${target} PUBLIC "${LIBCXX_ADDITIONAL_COMPILE_FLAGS}")
+ target_compile_options(${target} PUBLIC ${LIBCXX_ADDITIONAL_COMPILE_FLAGS})
endfunction()
# Exception flags =============================================================
diff --git a/libcxxabi/CMakeLists.txt b/libcxxabi/CMakeLists.txt
index ac1ee69d5f11c9..ef7473bf1a6cbb 100644
--- a/libcxxabi/CMakeLists.txt
+++ b/libcxxabi/CMakeLists.txt
@@ -224,6 +224,7 @@ set(LIBCXXABI_LINK_FLAGS "")
set(LIBCXXABI_LIBRARIES "")
set(LIBCXXABI_ADDITIONAL_COMPILE_FLAGS "" CACHE STRING
"Additional Compile only flags which can be provided in cache")
+separate_arguments(LIBCXXABI_ADDITIONAL_COMPILE_FLAGS)
set(LIBCXXABI_ADDITIONAL_LIBRARIES "" CACHE STRING
"Additional libraries libc++abi is linked to which can be provided in
cache")
diff --git a/libcxxabi/src/CMakeLists.txt b/libcxxabi/src/CMakeLists.txt
index 84fe2784bec5ca..3fc822ffdbcd6b 100644
--- a/libcxxabi/src/CMakeLists.txt
+++ b/libcxxabi/src/CMakeLists.txt
@@ -182,7 +182,7 @@ set_target_properties(cxxabi_shared_objects
if (CMAKE_POSITION_INDEPENDENT_CODE OR NOT DEFINED
CMAKE_POSITION_INDEPENDENT_CODE)
set_target_properties(cxxabi_shared_objects PROPERTIES
POSITION_INDEPENDENT_CODE ON) # must set manually because it's an object library
endif()
-target_compile_options(cxxabi_shared_objects PRIVATE
"${LIBCXXABI_ADDITIONAL_COMPILE_FLAGS}")
+target_compile_options(cxxabi_shared_objects PRIVATE
${LIBCXXABI_ADDITIONAL_COMPILE_FLAGS})
add_library(cxxabi_shared SHARED)
set_target_properties(cxxabi_shared
@@ -273,7 +273,7 @@ set_target_properties(cxxabi_static_objects
CXX_STANDARD_REQUIRED OFF # TODO: Make this REQUIRED once we don't need to
accommodate the LLVM documentation builders using an ancient CMake
COMPILE_FLAGS "${LIBCXXABI_COMPILE_FLAGS}"
)
-target_compile_options(cxxabi_static_objects PRIVATE
"${LIBCXXABI_ADDITIONAL_COMPILE_FLAGS}")
+target_compile_options(cxxabi_static_objects PRIVATE
${LIBCXXABI_ADDITIONAL_COMPILE_FLAGS})
if(LIBCXXABI_HERMETIC_STATIC_LIBRARY)
target_add_compile_flags_if_supported(cxxabi_static_objects PRIVATE
-fvisibility=hidden)
diff --git a/libunwind/CMakeLists.txt b/libunwind/CMakeLists.txt
index b911f482fc26b2..7d57417e122e04 100644
--- a/libunwind/CMakeLists.txt
+++ b/libunwind/CMakeLists.txt
@@ -164,6 +164,7 @@ set(LIBUNWIND_COMPILE_FLAGS "")
set(LIBUNWIND_LINK_FLAGS "")
set(LIBUNWIND_ADDITIONAL_COMPILE_FLAGS "" CACHE STRING
"Additional Compile only flags which can be provided in cache")
+separate_arguments(LIBUNWIND_ADDITIONAL_COMPILE_FLAGS)
set(LIBUNWIND_ADDITIONAL_LIBRARIES "" CACHE STRING
"Additional libraries libunwind is linked to which can be provided in
cache")
diff --git a/libunwind/src/CMakeLists.txt b/libunwind/src/CMakeLists.txt
index 2e18b109656331..05a266aa1c7451 100644
--- a/libunwind/src/CMakeLists.txt
+++ b/libunwind/src/CMakeLists.txt
@@ -140,7 +140,7 @@ else()
target_compile_options(unwind_shared_objects PRIVATE -fno-rtti)
endif()
target_link_libraries(unwind_shared_objects PRIVATE unwind-headers
${LIBUNWIND_LIBRARIES})
-target_compile_options(unwind_shared_objects PUBLIC
"${LIBUNWIND_ADDITIONAL_COMPILE_FLAGS}")
+target_compile_options(unwind_shared_objects PUBLIC
${LIBUNWIND_ADDITIONAL_COMPILE_FLAGS})
target_link_libraries(unwind_shared_objects PUBLIC
"${LIBUNWIND_ADDITIONAL_LIBRARIES}")
set_target_properties(unwind_shared_objects
PROPERTIES
@@ -181,7 +181,7 @@ else()
target_compile_options(unwind_static_objects PRIVATE -fno-rtti)
endif()
target_link_libraries(unwind_static_objects PRIVATE unwind-headers
${LIBUNWIND_LIBRARIES})
-target_compile_options(unwind_static_objects PUBLIC
"${LIBUNWIND_ADDITIONAL_COMPILE_FLAGS}")
+target_compile_options(unwind_static_objects PUBLIC
${LIBUNWIND_ADDITIONAL_COMPILE_FLAGS})
target_link_libraries(unwind_static_objects PUBLIC
"${LIBUNWIND_ADDITIONAL_LIBRARIES}")
set_target_properties(unwind_static_objects
PROPERTIES
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