89 lines
4.5 KiB
Diff
89 lines
4.5 KiB
Diff
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From dda331284db4cb6a43481aa7735dee26e504ff36 Mon Sep 17 00:00:00 2001
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From: Tom Stellard <tstellar@redhat.com>
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Date: Thu, 13 Dec 2018 18:21:23 +0000
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Subject: [PATCH] Don't add unnecessary compiler flags to llvm-config output
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Summary:
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llvm-config --cxxflags --cflags, should only output the minimal flags
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required to link against the llvm libraries. They currently contain
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all flags used to compile llvm including flags like -g, -pedantic,
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-Wall, etc, which users may not always want.
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This changes the llvm-config output to only include flags that have been
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explictly added to the COMPILE_FLAGS property of the llvm-config target
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by the llvm build system.
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llvm.org/PR8220
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Output from llvm-config when running cmake with:
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cmake -G Ninja .. -DCMAKE_CXX_FLAGS=-funroll-loops
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Before:
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--cppflags: -I$HEADERS_DIR/llvm/include -I$HEADERS_DIR/llvm/build/include
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-D_GNU_SOURCE -D_DEBUG -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
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--cflags: -I$HEADERS_DIR/llvm/include -I$HEADERS_DIR/llvm/build/include
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-fPIC -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings \
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-Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough \
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-Wno-comment -fdiagnostics-color -g -D_GNU_SOURCE -D_DEBUG -D__STDC_CONSTANT_MACROS \
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-D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
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--cxxflags: -I$HEADERS_DIR/llvm/include -I$HEADERS_DIR/llvm/build/include\
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-funroll-loops -fPIC -fvisibility-inlines-hidden -Werror=date-time -std=c++11 -Wall \
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-Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers \
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-pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized \
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-Wno-class-memaccess -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wno-comment \
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-fdiagnostics-color -g -fno-exceptions -fno-rtti -D_GNU_SOURCE -D_DEBUG \
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-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS"
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After:
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--cppflags: -I$HEADERS_DIR/llvm/include -I$HEADERS_DIR/llvm/build/include \
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-D_GNU_SOURCE -D_DEBUG -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
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--cflags: -I$HEADERS_DIR/llvm/include -I$HEADERS_DIR/llvm/build/include \
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-D_GNU_SOURCE -D_DEBUG -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
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--cxxflags: -I$HEADERS_DIR/llvm/include -I$HEADERS_DIR/llvm/build/include \
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-std=c++11 -fno-exceptions -fno-rtti \
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-D_GNU_SOURCE -D_DEBUG -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
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Reviewers: sylvestre.ledru, infinity0, mgorny
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Reviewed By: sylvestre.ledru, mgorny
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Subscribers: mgorny, dmgreen, llvm-commits
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Differential Revision: https://reviews.llvm.org/D55391
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llvm-svn: 349068
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---
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llvm/tools/llvm-config/CMakeLists.txt | 14 +++++++++++---
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1 file changed, 11 insertions(+), 3 deletions(-)
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diff --git a/tools/llvm-config/CMakeLists.txt b/tools/llvm-config/CMakeLists.txt
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index a0bd36c3731..a7db17386fb 100644
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--- a/tools/llvm-config/CMakeLists.txt
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+++ b/tools/llvm-config/CMakeLists.txt
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@@ -29,12 +29,20 @@ string(REPLACE ";" " " SYSTEM_LIBS "${SYSTEM_LIBS}")
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# Fetch target specific compile options, e.g. RTTI option
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get_property(COMPILE_FLAGS TARGET llvm-config PROPERTY COMPILE_FLAGS)
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+# The language standard potentially affects the ABI/API of LLVM, so we want
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+# to make sure it is reported by llvm-config.
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+# NOTE: We don't want to start extracting any random C/CXX flags that the
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+# user may add that could affect the ABI. We only want to extract flags
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+# that have been added by the LLVM build system.
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+string(REGEX MATCH "-std=[^ ]\+" LLVM_CXX_STD_FLAG ${CMAKE_CXX_FLAGS})
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+string(REGEX MATCH "-std=[^ ]\+" LLVM_C_STD_FLAG ${CMAKE_C_FLAGS})
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+
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# Use configure_file to create BuildVariables.inc.
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set(LLVM_SRC_ROOT ${LLVM_MAIN_SRC_DIR})
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set(LLVM_OBJ_ROOT ${LLVM_BINARY_DIR})
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-set(LLVM_CPPFLAGS "${CMAKE_CPP_FLAGS} ${CMAKE_CPP_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${LLVM_DEFINITIONS}")
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-set(LLVM_CFLAGS "${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${LLVM_DEFINITIONS}")
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-set(LLVM_CXXFLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${COMPILE_FLAGS} ${LLVM_DEFINITIONS}")
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+set(LLVM_CPPFLAGS "${LLVM_DEFINITIONS}")
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+set(LLVM_CFLAGS "${LLVM_C_STD_FLAG} ${LLVM_DEFINITIONS}")
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+set(LLVM_CXXFLAGS "${LLVM_CXX_STD_FLAG} ${COMPILE_FLAGS} ${LLVM_DEFINITIONS}")
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set(LLVM_BUILD_SYSTEM cmake)
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set(LLVM_HAS_RTTI ${LLVM_CONFIG_HAS_RTTI})
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set(LLVM_DYLIB_VERSION "${LLVM_VERSION_MAJOR}${LLVM_VERSION_SUFFIX}")
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