intel/llvm
1
0
Fork 0
mirror of https://github.com/intel/llvm.git synced 2026-01-24 08:30:34 +08:00
Code Issues Packages Projects Releases Wiki Activity

[CMake] Support using precompiled headers with ccache in flang (#136856)

Browse Source 
In order for precompiled headers to work with ccache, a specific flag
needs to be passed to the compiler and ccache's sloppiness configuration
option needs to be set appropriately.

Due to issues with configuring CMake on certain Windows platforms, set
the required ccache option only on non-Windows systems for the time
being.

-----

Signed-off-by: Kajetan Puchalski <kajetan.puchalski@arm.com>
This commit is contained in:
Kajetan Puchalski
2025-04-24 16:09:31 +01:00
committed by GitHub
parent 9ae7aa79b1
commit 0fcc9ffafd
2 changed files with 11 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
flang/CMakeLists.txt
View File

@@ -452,6 +452,10 @@ if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -fno-semantic-interposition")
endif()
# GCC requires this flag in order for precompiled headers to work with ccache
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND NOT CMAKE_DISABLE_PRECOMPILE_HEADERS)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fpch-preprocess")
endif()
endif()
# Clang on Darwin enables non-POSIX extensions by default, which allows the
@@ -462,6 +466,11 @@ if (APPLE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_POSIX_C_SOURCE=200809")
endif()
# Clang requires this flag in order for precompiled headers to work with ccache
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT CMAKE_DISABLE_PRECOMPILE_HEADERS)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Xclang -fno-pch-timestamp")
endif()
list(REMOVE_DUPLICATES CMAKE_CXX_FLAGS)
# Determine HOST_LINK_VERSION on Darwin.

4
llvm/CMakeLists.txt
View File

@@ -273,7 +273,7 @@ if(LLVM_CCACHE_BUILD)
if(CCACHE_PROGRAM)
set(LLVM_CCACHE_MAXSIZE "" CACHE STRING "Size of ccache")
set(LLVM_CCACHE_DIR "" CACHE STRING "Directory to keep ccached data")
set(LLVM_CCACHE_PARAMS "CCACHE_CPP2=yes CCACHE_HASHDIR=yes"
set(LLVM_CCACHE_PARAMS "CCACHE_CPP2=yes CCACHE_HASHDIR=yes CCACHE_SLOPPINESS=pch_defines,time_macros"
CACHE STRING "Parameters to pass through to ccache")
if(NOT CMAKE_SYSTEM_NAME MATCHES "Windows")
@@ -287,7 +287,7 @@ if(LLVM_CCACHE_BUILD)
set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ${CCACHE_PROGRAM})
else()
if(LLVM_CCACHE_MAXSIZE OR LLVM_CCACHE_DIR OR
NOT LLVM_CCACHE_PARAMS MATCHES "CCACHE_CPP2=yes CCACHE_HASHDIR=yes")
NOT LLVM_CCACHE_PARAMS MATCHES "CCACHE_CPP2=yes CCACHE_HASHDIR=yes CCACHE_SLOPPINESS=pch_defines,time_macros")
message(FATAL_ERROR "Ccache configuration through CMake is not supported on Windows. Please use environment variables.")
endif()
# RULE_LAUNCH_COMPILE should work with Ninja but currently has issues