From b708f1a2b9bc82ada6a22f6c63d9fb6ccedb2862 Mon Sep 17 00:00:00 2001 From: Brad King Date: Tue, 31 Jul 2012 14:26:43 -0400 Subject: [PATCH 1/3] CMakeDetermine(C|CXX)Compiler: Consider Clang compilers Look for "clang" or "clang++" compiler executables so Clang will be used when it is the only compiler available. Prefer them last to avoid changing compiler default preferences for existing scripts. --- Modules/CMakeDetermineCCompiler.cmake | 2 +- Modules/CMakeDetermineCXXCompiler.cmake | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/Modules/CMakeDetermineCCompiler.cmake b/Modules/CMakeDetermineCCompiler.cmake index 9028e8e06..5c7bec569 100644 --- a/Modules/CMakeDetermineCCompiler.cmake +++ b/Modules/CMakeDetermineCCompiler.cmake @@ -56,7 +56,7 @@ IF(NOT CMAKE_C_COMPILER) IF(CMAKE_C_COMPILER_INIT) SET(CMAKE_C_COMPILER_LIST ${CMAKE_C_COMPILER_INIT}) ELSE(CMAKE_C_COMPILER_INIT) - SET(CMAKE_C_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}gcc ${_CMAKE_TOOLCHAIN_PREFIX}cc cl bcc xlc) + SET(CMAKE_C_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}gcc ${_CMAKE_TOOLCHAIN_PREFIX}cc cl bcc xlc clang) ENDIF(CMAKE_C_COMPILER_INIT) # Find the compiler. diff --git a/Modules/CMakeDetermineCXXCompiler.cmake b/Modules/CMakeDetermineCXXCompiler.cmake index 7f8f3ec8b..f78d7a778 100644 --- a/Modules/CMakeDetermineCXXCompiler.cmake +++ b/Modules/CMakeDetermineCXXCompiler.cmake @@ -55,7 +55,7 @@ IF(NOT CMAKE_CXX_COMPILER) IF(CMAKE_CXX_COMPILER_INIT) SET(CMAKE_CXX_COMPILER_LIST ${CMAKE_CXX_COMPILER_INIT}) ELSE(CMAKE_CXX_COMPILER_INIT) - SET(CMAKE_CXX_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}c++ ${_CMAKE_TOOLCHAIN_PREFIX}g++ CC aCC cl bcc xlC) + SET(CMAKE_CXX_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}c++ ${_CMAKE_TOOLCHAIN_PREFIX}g++ CC aCC cl bcc xlC clang++) ENDIF(CMAKE_CXX_COMPILER_INIT) # Find the compiler. From 796e33734db09d80041872e4ce04e838146466df Mon Sep 17 00:00:00 2001 From: Brad King Date: Thu, 2 Aug 2012 11:08:55 -0400 Subject: [PATCH 2/3] Factor common code out of CMakeDetermine(ASM|C|CXX|Fortran)Compiler The compiler candidate list selection and search code for C, C++, ASM, and Fortran languages was duplicated across four modules. To look for compilers adjacent to already-enabled languages the C and CXX modules each used _CMAKE_USER_(C|CXX)_COMPILER_PATH and the ASM module used _CMAKE_TOOLCHAIN_LOCATION. Since commit 4debb7ac (Bias Fortran compiler search with C/C++ compilers, 2009-09-09) CMake prefers Fortran compilers matching the vendor and directory of an enabled C or C++ compiler. Factor out the common functionality among the four languages into a new CMakeDetermineCompiler module. Generalize the Fortran implementation so that all languages may each use the vendor and directory of the other languages that have already been enabled. For now do not list any vendor-specific names for C, C++, or ASM so that only the directory preference is used for these languages (existing behavior). --- Modules/CMakeDetermineASMCompiler.cmake | 35 ++++------- Modules/CMakeDetermineCCompiler.cmake | 17 ++---- Modules/CMakeDetermineCXXCompiler.cmake | 18 ++---- Modules/CMakeDetermineCompiler.cmake | 66 +++++++++++++++++++++ Modules/CMakeDetermineFortranCompiler.cmake | 43 ++------------ 5 files changed, 93 insertions(+), 86 deletions(-) create mode 100644 Modules/CMakeDetermineCompiler.cmake diff --git a/Modules/CMakeDetermineASMCompiler.cmake b/Modules/CMakeDetermineASMCompiler.cmake index 0a70d0a82..a56020fb6 100644 --- a/Modules/CMakeDetermineASMCompiler.cmake +++ b/Modules/CMakeDetermineASMCompiler.cmake @@ -14,6 +14,8 @@ # determine the compiler to use for ASM programs +INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompiler.cmake) + IF(NOT CMAKE_ASM${ASM_DIALECT}_COMPILER) # prefer the environment variable ASM IF($ENV{ASM${ASM_DIALECT}} MATCHES ".+") @@ -22,42 +24,27 @@ IF(NOT CMAKE_ASM${ASM_DIALECT}_COMPILER) # finally list compilers to try IF("ASM${ASM_DIALECT}" STREQUAL "ASM") # the generic assembler support - - IF(CMAKE_ASM_COMPILER_INIT) - SET(CMAKE_ASM_COMPILER_LIST ${CMAKE_ASM_COMPILER_INIT}) - ELSE(CMAKE_ASM_COMPILER_INIT) - + IF(NOT CMAKE_ASM_COMPILER_INIT) IF(CMAKE_C_COMPILER) SET(CMAKE_ASM_COMPILER "${CMAKE_C_COMPILER}" CACHE FILEPATH "The ASM compiler") SET(CMAKE_ASM_COMPILER_ID "${CMAKE_C_COMPILER_ID}") ELSEIF(CMAKE_CXX_COMPILER) SET(CMAKE_ASM_COMPILER "${CMAKE_CXX_COMPILER}" CACHE FILEPATH "The ASM compiler") SET(CMAKE_ASM_COMPILER_ID "${CMAKE_CXX_COMPILER_ID}") - ELSE(CMAKE_CXX_COMPILER) + ELSE() # List all default C and CXX compilers SET(CMAKE_ASM${ASM_DIALECT}_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}gcc ${_CMAKE_TOOLCHAIN_PREFIX}cc cl bcc xlc ${_CMAKE_TOOLCHAIN_PREFIX}c++ ${_CMAKE_TOOLCHAIN_PREFIX}g++ CC aCC cl bcc xlC) - ENDIF(CMAKE_C_COMPILER) - - ENDIF(CMAKE_ASM_COMPILER_INIT) - - - ELSE("ASM${ASM_DIALECT}" STREQUAL "ASM") # some specific assembler "dialect" - - IF(CMAKE_ASM${ASM_DIALECT}_COMPILER_INIT) - SET(CMAKE_ASM${ASM_DIALECT}_COMPILER_LIST ${CMAKE_ASM${ASM_DIALECT}_COMPILER_INIT}) - ELSE(CMAKE_ASM${ASM_DIALECT}_COMPILER_INIT) + ENDIF() + ENDIF() + ELSE() # some specific assembler "dialect" + IF(NOT CMAKE_ASM${ASM_DIALECT}_COMPILER_INIT) MESSAGE(FATAL_ERROR "CMAKE_ASM${ASM_DIALECT}_COMPILER_INIT must be preset !") - ENDIF(CMAKE_ASM${ASM_DIALECT}_COMPILER_INIT) - - ENDIF("ASM${ASM_DIALECT}" STREQUAL "ASM") - + ENDIF() + ENDIF() # Find the compiler. - IF (_CMAKE_USER_CXX_COMPILER_PATH OR _CMAKE_USER_C_COMPILER_PATH) - FIND_PROGRAM(CMAKE_ASM${ASM_DIALECT}_COMPILER NAMES ${CMAKE_ASM${ASM_DIALECT}_COMPILER_LIST} PATHS ${_CMAKE_USER_C_COMPILER_PATH} ${_CMAKE_USER_CXX_COMPILER_PATH} DOC "Assembler" NO_DEFAULT_PATH) - ENDIF (_CMAKE_USER_CXX_COMPILER_PATH OR _CMAKE_USER_C_COMPILER_PATH) - FIND_PROGRAM(CMAKE_ASM${ASM_DIALECT}_COMPILER NAMES ${CMAKE_ASM${ASM_DIALECT}_COMPILER_LIST} PATHS ${_CMAKE_TOOLCHAIN_LOCATION} DOC "Assembler") + _cmake_find_compiler(ASM${ASM_DIALECT}) ELSE(NOT CMAKE_ASM${ASM_DIALECT}_COMPILER) diff --git a/Modules/CMakeDetermineCCompiler.cmake b/Modules/CMakeDetermineCCompiler.cmake index 5c7bec569..9ebf0b395 100644 --- a/Modules/CMakeDetermineCCompiler.cmake +++ b/Modules/CMakeDetermineCCompiler.cmake @@ -31,6 +31,8 @@ # If not already set before, it also sets # _CMAKE_TOOLCHAIN_PREFIX +INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompiler.cmake) + IF(NOT CMAKE_C_COMPILER) SET(CMAKE_C_COMPILER_INIT NOTFOUND) @@ -53,21 +55,12 @@ IF(NOT CMAKE_C_COMPILER) ENDIF(CMAKE_GENERATOR_CC) # finally list compilers to try - IF(CMAKE_C_COMPILER_INIT) - SET(CMAKE_C_COMPILER_LIST ${CMAKE_C_COMPILER_INIT}) - ELSE(CMAKE_C_COMPILER_INIT) + IF(NOT CMAKE_C_COMPILER_INIT) SET(CMAKE_C_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}gcc ${_CMAKE_TOOLCHAIN_PREFIX}cc cl bcc xlc clang) - ENDIF(CMAKE_C_COMPILER_INIT) + ENDIF() - # Find the compiler. - IF (_CMAKE_USER_CXX_COMPILER_PATH) - FIND_PROGRAM(CMAKE_C_COMPILER NAMES ${CMAKE_C_COMPILER_LIST} PATHS ${_CMAKE_USER_CXX_COMPILER_PATH} DOC "C compiler" NO_DEFAULT_PATH) - ENDIF (_CMAKE_USER_CXX_COMPILER_PATH) - FIND_PROGRAM(CMAKE_C_COMPILER NAMES ${CMAKE_C_COMPILER_LIST} DOC "C compiler") + _cmake_find_compiler(C) - IF(CMAKE_C_COMPILER_INIT AND NOT CMAKE_C_COMPILER) - SET(CMAKE_C_COMPILER "${CMAKE_C_COMPILER_INIT}" CACHE FILEPATH "C compiler" FORCE) - ENDIF(CMAKE_C_COMPILER_INIT AND NOT CMAKE_C_COMPILER) ELSE(NOT CMAKE_C_COMPILER) # we only get here if CMAKE_C_COMPILER was specified using -D or a pre-made CMakeCache.txt diff --git a/Modules/CMakeDetermineCXXCompiler.cmake b/Modules/CMakeDetermineCXXCompiler.cmake index f78d7a778..43b44acd9 100644 --- a/Modules/CMakeDetermineCXXCompiler.cmake +++ b/Modules/CMakeDetermineCXXCompiler.cmake @@ -30,6 +30,8 @@ # If not already set before, it also sets # _CMAKE_TOOLCHAIN_PREFIX +INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompiler.cmake) + IF(NOT CMAKE_CXX_COMPILER) SET(CMAKE_CXX_COMPILER_INIT NOTFOUND) @@ -52,21 +54,11 @@ IF(NOT CMAKE_CXX_COMPILER) ENDIF(CMAKE_GENERATOR_CXX) # finally list compilers to try - IF(CMAKE_CXX_COMPILER_INIT) - SET(CMAKE_CXX_COMPILER_LIST ${CMAKE_CXX_COMPILER_INIT}) - ELSE(CMAKE_CXX_COMPILER_INIT) + IF(NOT CMAKE_CXX_COMPILER_INIT) SET(CMAKE_CXX_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}c++ ${_CMAKE_TOOLCHAIN_PREFIX}g++ CC aCC cl bcc xlC clang++) - ENDIF(CMAKE_CXX_COMPILER_INIT) + ENDIF() - # Find the compiler. - IF (_CMAKE_USER_C_COMPILER_PATH) - FIND_PROGRAM(CMAKE_CXX_COMPILER NAMES ${CMAKE_CXX_COMPILER_LIST} PATHS ${_CMAKE_USER_C_COMPILER_PATH} DOC "C++ compiler" NO_DEFAULT_PATH) - ENDIF (_CMAKE_USER_C_COMPILER_PATH) - FIND_PROGRAM(CMAKE_CXX_COMPILER NAMES ${CMAKE_CXX_COMPILER_LIST} DOC "C++ compiler") - - IF(CMAKE_CXX_COMPILER_INIT AND NOT CMAKE_CXX_COMPILER) - SET(CMAKE_CXX_COMPILER "${CMAKE_CXX_COMPILER_INIT}" CACHE FILEPATH "C++ compiler" FORCE) - ENDIF(CMAKE_CXX_COMPILER_INIT AND NOT CMAKE_CXX_COMPILER) + _cmake_find_compiler(CXX) ELSE(NOT CMAKE_CXX_COMPILER) # we only get here if CMAKE_CXX_COMPILER was specified using -D or a pre-made CMakeCache.txt diff --git a/Modules/CMakeDetermineCompiler.cmake b/Modules/CMakeDetermineCompiler.cmake new file mode 100644 index 000000000..55d554bdc --- /dev/null +++ b/Modules/CMakeDetermineCompiler.cmake @@ -0,0 +1,66 @@ + +#============================================================================= +# Copyright 2004-2012 Kitware, Inc. +# +# Distributed under the OSI-approved BSD License (the "License"); +# see accompanying file Copyright.txt for details. +# +# This software is distributed WITHOUT ANY WARRANTY; without even the +# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. +# See the License for more information. +#============================================================================= +# (To distribute this file outside of CMake, substitute the full +# License text for the above reference.) + +macro(_cmake_find_compiler lang) + # Use already-enabled languages for reference. + get_property(_languages GLOBAL PROPERTY ENABLED_LANGUAGES) + list(REMOVE_ITEM _languages "${lang}") + + if(CMAKE_${lang}_COMPILER_INIT) + # Search only for the specified compiler. + set(CMAKE_${lang}_COMPILER_LIST "${CMAKE_${lang}_COMPILER_INIT}") + else() + # Re-order the compiler list with preferred vendors first. + set(_${lang}_COMPILER_LIST "${CMAKE_${lang}_COMPILER_LIST}") + set(CMAKE_${lang}_COMPILER_LIST "") + # Prefer vendors of compilers from reference languages. + foreach(l ${_languages}) + list(APPEND CMAKE_${lang}_COMPILER_LIST + ${_${lang}_COMPILER_NAMES_${CMAKE_${l}_COMPILER_ID}}) + endforeach() + # Append the rest of the list and remove duplicates. + list(APPEND CMAKE_${lang}_COMPILER_LIST ${_${lang}_COMPILER_LIST}) + unset(_${lang}_COMPILER_LIST) + list(REMOVE_DUPLICATES CMAKE_${lang}_COMPILER_LIST) + endif() + + # Look for directories containing compilers of reference languages. + set(_${lang}_COMPILER_HINTS) + foreach(l ${_languages}) + if(CMAKE_${l}_COMPILER AND IS_ABSOLUTE "${CMAKE_${l}_COMPILER}") + get_filename_component(_hint "${CMAKE_${l}_COMPILER}" PATH) + if(IS_DIRECTORY "${_hint}") + list(APPEND _${lang}_COMPILER_HINTS "${_hint}") + endif() + unset(_hint) + endif() + endforeach() + + # Find the compiler. + if(_${lang}_COMPILER_HINTS) + # Prefer directories containing compilers of reference languages. + list(REMOVE_DUPLICATES _${lang}_COMPILER_HINTS) + find_program(CMAKE_${lang}_COMPILER + NAMES ${CMAKE_${lang}_COMPILER_LIST} + PATHS ${_${lang}_COMPILER_HINTS} + NO_DEFAULT_PATH + DOC "${lang} compiler") + endif() + find_program(CMAKE_${lang}_COMPILER NAMES ${CMAKE_${lang}_COMPILER_LIST} DOC "${lang} compiler") + if(CMAKE_${lang}_COMPILER_INIT AND NOT CMAKE_${lang}_COMPILER) + set(CMAKE_${lang}_COMPILER "${CMAKE_${lang}_COMPILER_INIT}" CACHE FILEPATH "${lang} compiler" FORCE) + endif() + unset(_${lang}_COMPILER_HINTS) + unset(_languages) +endmacro() diff --git a/Modules/CMakeDetermineFortranCompiler.cmake b/Modules/CMakeDetermineFortranCompiler.cmake index ade6d586c..6d6990e6f 100644 --- a/Modules/CMakeDetermineFortranCompiler.cmake +++ b/Modules/CMakeDetermineFortranCompiler.cmake @@ -19,6 +19,8 @@ # the cmake variable CMAKE_GENERATOR_FC which can be defined by a generator # as a default compiler +INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompiler.cmake) + IF(NOT CMAKE_Fortran_COMPILER) # prefer the environment variable CC IF($ENV{FC} MATCHES ".+") @@ -40,9 +42,7 @@ IF(NOT CMAKE_Fortran_COMPILER) ENDIF(CMAKE_GENERATOR_FC) # finally list compilers to try - IF(CMAKE_Fortran_COMPILER_INIT) - SET(CMAKE_Fortran_COMPILER_LIST ${CMAKE_Fortran_COMPILER_INIT}) - ELSE(CMAKE_Fortran_COMPILER_INIT) + IF(NOT CMAKE_Fortran_COMPILER_INIT) # Known compilers: # f77/f90/f95: generic compiler names # g77: GNU Fortran 77 compiler @@ -77,41 +77,10 @@ IF(NOT CMAKE_Fortran_COMPILER) SET(_Fortran_COMPILER_NAMES_PathScale pathf2003 pathf95 pathf90) SET(_Fortran_COMPILER_NAMES_XL xlf) SET(_Fortran_COMPILER_NAMES_VisualAge xlf95 xlf90 xlf) - - # Prefer vendors matching the C and C++ compilers. - SET(CMAKE_Fortran_COMPILER_LIST - ${_Fortran_COMPILER_NAMES_${CMAKE_C_COMPILER_ID}} - ${_Fortran_COMPILER_NAMES_${CMAKE_CXX_COMPILER_ID}} - ${CMAKE_Fortran_COMPILER_LIST}) - LIST(REMOVE_DUPLICATES CMAKE_Fortran_COMPILER_LIST) - ENDIF(CMAKE_Fortran_COMPILER_INIT) - - # Look for directories containing the C and C++ compilers. - SET(_Fortran_COMPILER_HINTS) - FOREACH(lang C CXX) - IF(CMAKE_${lang}_COMPILER AND IS_ABSOLUTE "${CMAKE_${lang}_COMPILER}") - GET_FILENAME_COMPONENT(_hint "${CMAKE_${lang}_COMPILER}" PATH) - IF(IS_DIRECTORY "${_hint}") - LIST(APPEND _Fortran_COMPILER_HINTS "${_hint}") - ENDIF() - SET(_hint) - ENDIF() - ENDFOREACH() - - # Find the compiler. - IF(_Fortran_COMPILER_HINTS) - # Prefer directories containing C and C++ compilers. - LIST(REMOVE_DUPLICATES _Fortran_COMPILER_HINTS) - FIND_PROGRAM(CMAKE_Fortran_COMPILER - NAMES ${CMAKE_Fortran_COMPILER_LIST} - PATHS ${_Fortran_COMPILER_HINTS} - NO_DEFAULT_PATH - DOC "Fortran compiler") ENDIF() - FIND_PROGRAM(CMAKE_Fortran_COMPILER NAMES ${CMAKE_Fortran_COMPILER_LIST} DOC "Fortran compiler") - IF(CMAKE_Fortran_COMPILER_INIT AND NOT CMAKE_Fortran_COMPILER) - SET(CMAKE_Fortran_COMPILER "${CMAKE_Fortran_COMPILER_INIT}" CACHE FILEPATH "Fortran compiler" FORCE) - ENDIF(CMAKE_Fortran_COMPILER_INIT AND NOT CMAKE_Fortran_COMPILER) + + _cmake_find_compiler(Fortran) + ELSE(NOT CMAKE_Fortran_COMPILER) # we only get here if CMAKE_Fortran_COMPILER was specified using -D or a pre-made CMakeCache.txt # (e.g. via ctest) or set in CMAKE_TOOLCHAIN_FILE From 7e58e5bb68cb058370b5015f576ee5507e56facc Mon Sep 17 00:00:00 2001 From: Brad King Date: Thu, 2 Aug 2012 11:53:25 -0400 Subject: [PATCH 3/3] Prefer generic system compilers by default for C, C++, and Fortran Teach CMake to prefer the system default compiler automatically when no compiler is specified. By default use "cc" for C, "CC" for C++, and "f95" for Fortran. Load a new Platform/-.cmake module to allow each platform to specify for each language its system compiler name(s) and/or exclude certain names. Create Platform/(CYGWIN|Darwin|Linux|Windows)-CXX.cmake modules to specify "c++" as the system C++ compiler name for these platforms. On systems that use case-insensitive filesystems exclude C++ compiler names that are distinguished from C compiler names only by case. This will change the default compiler selection for existing build scripts that do not specify a compiler when run on machines with separate system and GNU compilers both installed in the PATH. We do not make this change in default behavior lightly. However: (1) If a given build really needs specific compilers one should specify them explicitly e.g. by setting CC, CXX, and FC in the environment. (2) The motivating case is to prefer the system Clang on newer OS X systems over the older GNU compilers typically also installed. On such systems the names "cc" and "c++" link to Clang. This is the first platform known to CMake on which "c++" is not a GNU compiler. The old behavior selected "gcc" for C and "c++" C++ and therefore chooses GNU for C and Clang for C++ by default. The new behavior selects GNU or Clang consistently for both languages on older or newer OS X systems, respectively. (3) Other than the motivating OS X case the conditions under which the behavior changes do not tend to exist in default OS installations. They typically occur only on non-GNU systems with manually-installed GNU compilers. (4) The consequences of the new behavior are not dire. At worst the project fails to compile with the system compiler when it previously worked with the non-system GNU compiler. Such failure is easy to work around (see #1). In short this change creates a more sensible default behavior everywhere and fixes poor default behavior on a widely-used platform at the cost of a modest change in behavior in less-common conditions. --- Modules/CMakeDetermineASMCompiler.cmake | 5 +++-- Modules/CMakeDetermineCCompiler.cmake | 8 +++++++- Modules/CMakeDetermineCXXCompiler.cmake | 8 +++++++- Modules/CMakeDetermineCompiler.cmake | 6 ++++++ Modules/CMakeDetermineFortranCompiler.cmake | 4 ++++ Modules/Platform/CYGWIN-CXX.cmake | 7 +++++++ Modules/Platform/Darwin-CXX.cmake | 7 +++++++ Modules/Platform/Linux-CXX.cmake | 3 +++ Modules/Platform/Windows-CXX.cmake | 7 +++++++ 9 files changed, 51 insertions(+), 4 deletions(-) create mode 100644 Modules/Platform/CYGWIN-CXX.cmake create mode 100644 Modules/Platform/Darwin-CXX.cmake create mode 100644 Modules/Platform/Linux-CXX.cmake create mode 100644 Modules/Platform/Windows-CXX.cmake diff --git a/Modules/CMakeDetermineASMCompiler.cmake b/Modules/CMakeDetermineASMCompiler.cmake index a56020fb6..7da6ac04a 100644 --- a/Modules/CMakeDetermineASMCompiler.cmake +++ b/Modules/CMakeDetermineASMCompiler.cmake @@ -33,8 +33,9 @@ IF(NOT CMAKE_ASM${ASM_DIALECT}_COMPILER) SET(CMAKE_ASM_COMPILER_ID "${CMAKE_CXX_COMPILER_ID}") ELSE() # List all default C and CXX compilers - SET(CMAKE_ASM${ASM_DIALECT}_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}gcc ${_CMAKE_TOOLCHAIN_PREFIX}cc cl bcc xlc - ${_CMAKE_TOOLCHAIN_PREFIX}c++ ${_CMAKE_TOOLCHAIN_PREFIX}g++ CC aCC cl bcc xlC) + SET(CMAKE_ASM${ASM_DIALECT}_COMPILER_LIST + ${_CMAKE_TOOLCHAIN_PREFIX}cc ${_CMAKE_TOOLCHAIN_PREFIX}gcc cl bcc xlc + CC ${_CMAKE_TOOLCHAIN_PREFIX}c++ ${_CMAKE_TOOLCHAIN_PREFIX}g++ aCC cl bcc xlC) ENDIF() ENDIF() ELSE() # some specific assembler "dialect" diff --git a/Modules/CMakeDetermineCCompiler.cmake b/Modules/CMakeDetermineCCompiler.cmake index 9ebf0b395..3ce968c02 100644 --- a/Modules/CMakeDetermineCCompiler.cmake +++ b/Modules/CMakeDetermineCCompiler.cmake @@ -33,6 +33,12 @@ INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompiler.cmake) +# Load system-specific compiler preferences for this language. +INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-C OPTIONAL) +IF(NOT CMAKE_C_COMPILER_NAMES) + SET(CMAKE_C_COMPILER_NAMES cc) +ENDIF() + IF(NOT CMAKE_C_COMPILER) SET(CMAKE_C_COMPILER_INIT NOTFOUND) @@ -56,7 +62,7 @@ IF(NOT CMAKE_C_COMPILER) # finally list compilers to try IF(NOT CMAKE_C_COMPILER_INIT) - SET(CMAKE_C_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}gcc ${_CMAKE_TOOLCHAIN_PREFIX}cc cl bcc xlc clang) + SET(CMAKE_C_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}cc ${_CMAKE_TOOLCHAIN_PREFIX}gcc cl bcc xlc clang) ENDIF() _cmake_find_compiler(C) diff --git a/Modules/CMakeDetermineCXXCompiler.cmake b/Modules/CMakeDetermineCXXCompiler.cmake index 43b44acd9..0116d341a 100644 --- a/Modules/CMakeDetermineCXXCompiler.cmake +++ b/Modules/CMakeDetermineCXXCompiler.cmake @@ -32,6 +32,12 @@ INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompiler.cmake) +# Load system-specific compiler preferences for this language. +INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-CXX OPTIONAL) +IF(NOT CMAKE_CXX_COMPILER_NAMES) + SET(CMAKE_CXX_COMPILER_NAMES CC) +ENDIF() + IF(NOT CMAKE_CXX_COMPILER) SET(CMAKE_CXX_COMPILER_INIT NOTFOUND) @@ -55,7 +61,7 @@ IF(NOT CMAKE_CXX_COMPILER) # finally list compilers to try IF(NOT CMAKE_CXX_COMPILER_INIT) - SET(CMAKE_CXX_COMPILER_LIST ${_CMAKE_TOOLCHAIN_PREFIX}c++ ${_CMAKE_TOOLCHAIN_PREFIX}g++ CC aCC cl bcc xlC clang++) + SET(CMAKE_CXX_COMPILER_LIST CC ${_CMAKE_TOOLCHAIN_PREFIX}c++ ${_CMAKE_TOOLCHAIN_PREFIX}g++ aCC cl bcc xlC clang++) ENDIF() _cmake_find_compiler(CXX) diff --git a/Modules/CMakeDetermineCompiler.cmake b/Modules/CMakeDetermineCompiler.cmake index 55d554bdc..2d12c0757 100644 --- a/Modules/CMakeDetermineCompiler.cmake +++ b/Modules/CMakeDetermineCompiler.cmake @@ -29,10 +29,16 @@ macro(_cmake_find_compiler lang) list(APPEND CMAKE_${lang}_COMPILER_LIST ${_${lang}_COMPILER_NAMES_${CMAKE_${l}_COMPILER_ID}}) endforeach() + # Prefer vendors based on the platform. + list(APPEND CMAKE_${lang}_COMPILER_LIST ${CMAKE_${lang}_COMPILER_NAMES}) # Append the rest of the list and remove duplicates. list(APPEND CMAKE_${lang}_COMPILER_LIST ${_${lang}_COMPILER_LIST}) unset(_${lang}_COMPILER_LIST) list(REMOVE_DUPLICATES CMAKE_${lang}_COMPILER_LIST) + if(CMAKE_${lang}_COMPILER_EXCLUDE) + list(REMOVE_ITEM CMAKE_${lang}_COMPILER_LIST + ${CMAKE_${lang}_COMPILER_EXCLUDE}) + endif() endif() # Look for directories containing compilers of reference languages. diff --git a/Modules/CMakeDetermineFortranCompiler.cmake b/Modules/CMakeDetermineFortranCompiler.cmake index 6d6990e6f..45033c2a3 100644 --- a/Modules/CMakeDetermineFortranCompiler.cmake +++ b/Modules/CMakeDetermineFortranCompiler.cmake @@ -20,6 +20,10 @@ # as a default compiler INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompiler.cmake) +INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-Fortran OPTIONAL) +IF(NOT CMAKE_Fortran_COMPILER_NAMES) + SET(CMAKE_Fortran_COMPILER_NAMES f95) +ENDIF() IF(NOT CMAKE_Fortran_COMPILER) # prefer the environment variable CC diff --git a/Modules/Platform/CYGWIN-CXX.cmake b/Modules/Platform/CYGWIN-CXX.cmake new file mode 100644 index 000000000..bf37f7903 --- /dev/null +++ b/Modules/Platform/CYGWIN-CXX.cmake @@ -0,0 +1,7 @@ +if(NOT CMAKE_CXX_COMPILER_NAMES) + set(CMAKE_CXX_COMPILER_NAMES c++) +endif() + +# Exclude C++ compilers differing from C compiler only by case +# because this platform may have a case-insensitive filesystem. +set(CMAKE_CXX_COMPILER_EXCLUDE CC aCC xlC) diff --git a/Modules/Platform/Darwin-CXX.cmake b/Modules/Platform/Darwin-CXX.cmake new file mode 100644 index 000000000..bf37f7903 --- /dev/null +++ b/Modules/Platform/Darwin-CXX.cmake @@ -0,0 +1,7 @@ +if(NOT CMAKE_CXX_COMPILER_NAMES) + set(CMAKE_CXX_COMPILER_NAMES c++) +endif() + +# Exclude C++ compilers differing from C compiler only by case +# because this platform may have a case-insensitive filesystem. +set(CMAKE_CXX_COMPILER_EXCLUDE CC aCC xlC) diff --git a/Modules/Platform/Linux-CXX.cmake b/Modules/Platform/Linux-CXX.cmake new file mode 100644 index 000000000..b594daeb0 --- /dev/null +++ b/Modules/Platform/Linux-CXX.cmake @@ -0,0 +1,3 @@ +if(NOT CMAKE_CXX_COMPILER_NAMES) + set(CMAKE_CXX_COMPILER_NAMES c++) +endif() diff --git a/Modules/Platform/Windows-CXX.cmake b/Modules/Platform/Windows-CXX.cmake new file mode 100644 index 000000000..bf37f7903 --- /dev/null +++ b/Modules/Platform/Windows-CXX.cmake @@ -0,0 +1,7 @@ +if(NOT CMAKE_CXX_COMPILER_NAMES) + set(CMAKE_CXX_COMPILER_NAMES c++) +endif() + +# Exclude C++ compilers differing from C compiler only by case +# because this platform may have a case-insensitive filesystem. +set(CMAKE_CXX_COMPILER_EXCLUDE CC aCC xlC)