diff options
Diffstat (limited to 'm4/fptools_set_haskell_platform_vars.m4')
| -rw-r--r-- | m4/fptools_set_haskell_platform_vars.m4 | 105 |
1 files changed, 54 insertions, 51 deletions
diff --git a/m4/fptools_set_haskell_platform_vars.m4 b/m4/fptools_set_haskell_platform_vars.m4 index 7aec2e1d57..23b7ec8265 100644 --- a/m4/fptools_set_haskell_platform_vars.m4 +++ b/m4/fptools_set_haskell_platform_vars.m4 @@ -1,7 +1,7 @@ -# FPTOOLS_SET_HASKELL_PLATFORM_VARS +# FPTOOLS_SET_HASKELL_PLATFORM_VARS_SHELL_FUNCTIONS # ---------------------------------- -# Set the Haskell platform variables -AC_DEFUN([FPTOOLS_SET_HASKELL_PLATFORM_VARS], +# Drop in shell functions used by FPTOOLS_SET_HASKELL_PLATFORM_VARS +AC_DEFUN([FPTOOLS_SET_HASKELL_PLATFORM_VARS_SHELL_FUNCTIONS], [ checkArch() { case [$]1 in @@ -118,29 +118,32 @@ AC_DEFUN([FPTOOLS_SET_HASKELL_PLATFORM_VARS], ;; esac } +]) - dnl Note [autoconf assembler checks and -flto] - dnl ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - dnl - dnl Autoconf's AC_COMPILE_IFELSE macro is fragile in the case of checks - dnl which require that the assembler is run. Specifically, GCC does not run - dnl the assembler if invoked with `-c -flto`; it merely dumps its internal - dnl AST to the object file, to be compiled and assembled during the final - dnl link. - dnl - dnl This can cause configure checks like that for the - dnl .subsections_via_symbols directive to pass unexpected (see #16440), - dnl leading the build system to incorrectly conclude that the directive is - dnl supported. - dnl - dnl For this reason, it is important that configure checks that rely on the - dnl assembler failing use AC_LINK_IFELSE rather than AC_COMPILE_IFELSE, - dnl ensuring that the assembler sees the check. - dnl - - dnl ** check for Apple-style dead-stripping support - dnl (.subsections-via-symbols assembler directive) +# Note [autoconf assembler checks and -flto] +# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +# +# Autoconf's AC_COMPILE_IFELSE macro is fragile in the case of checks +# which require that the assembler is run. Specifically, GCC does not run +# the assembler if invoked with `-c -flto`; it merely dumps its internal +# AST to the object file, to be compiled and assembled during the final +# link. +# +# This can cause configure checks like that for the +# .subsections_via_symbols directive to pass unexpected (see #16440), +# leading the build system to incorrectly conclude that the directive is +# supported. +# +# For this reason, it is important that configure checks that rely on the +# assembler failing use AC_LINK_IFELSE rather than AC_COMPILE_IFELSE, +# ensuring that the assembler sees the check. +# GHC_SUBSECTIONS_VIA_SYMBOLS +# ---------------------------------- +# check for Apple-style dead-stripping support +# (.subsections-via-symbols assembler directive) +AC_DEFUN([GHC_SUBSECTIONS_VIA_SYMBOLS], +[ AC_MSG_CHECKING(for .subsections_via_symbols) dnl See Note [autoconf assembler checks and -flto] AC_LINK_IFELSE( @@ -157,9 +160,13 @@ AC_DEFUN([FPTOOLS_SET_HASKELL_PLATFORM_VARS], ], [TargetHasSubsectionsViaSymbols=NO AC_MSG_RESULT(no)]) +]) - dnl ** check for .ident assembler directive - +# GHC_IDENT_DIRECTIVE +# ---------------------------------- +# check for .ident assembler directive +AC_DEFUN([GHC_IDENT_DIRECTIVE], +[ AC_MSG_CHECKING(whether your assembler supports .ident directive) dnl See Note [autoconf assembler checks and -flto] AC_LINK_IFELSE( @@ -168,13 +175,18 @@ AC_DEFUN([FPTOOLS_SET_HASKELL_PLATFORM_VARS], TargetHasIdentDirective=YES], [AC_MSG_RESULT(no) TargetHasIdentDirective=NO]) +]) - dnl *** check for GNU non-executable stack note support (ELF only) - dnl (.section .note.GNU-stack,"",@progbits) - - dnl This test doesn't work with "gcc -g" in gcc 4.4 (GHC trac #3889: - dnl Error: can't resolve `.note.GNU-stack' {.note.GNU-stack section} - `.Ltext0' {.text section} - dnl so we empty CFLAGS while running this test +# GHC_GNU_NONEXEC_STACK +# ---------------------------------- +# *** check for GNU non-executable stack note support (ELF only) +# (.section .note.GNU-stack,"",@progbits) +# +# This test doesn't work with "gcc -g" in gcc 4.4 (GHC trac #3889: +# Error: can't resolve `.note.GNU-stack' {.note.GNU-stack section} - `.Ltext0' {.text section} +# so we empty CFLAGS while running this test +AC_DEFUN([GHC_GNU_NONEXEC_STACK], +[ CFLAGS2="$CFLAGS" CFLAGS= case $TargetArch in @@ -201,24 +213,15 @@ AC_DEFUN([FPTOOLS_SET_HASKELL_PLATFORM_VARS], [AC_MSG_RESULT(no) TargetHasGnuNonexecStack=NO]) CFLAGS="$CFLAGS2" +]) - checkArch "$BuildArch" "HaskellBuildArch" - checkVendor "$BuildVendor" - checkOS "$BuildOS" "" - - checkArch "$HostArch" "HaskellHostArch" - checkVendor "$HostVendor" - checkOS "$HostOS" "HaskellHostOs" - - checkArch "$TargetArch" "HaskellTargetArch" - checkVendor "$TargetVendor" - checkOS "$TargetOS" "HaskellTargetOs" - - AC_SUBST(HaskellHostArch) - AC_SUBST(HaskellHostOs) - AC_SUBST(HaskellTargetArch) - AC_SUBST(HaskellTargetOs) - AC_SUBST(TargetHasSubsectionsViaSymbols) - AC_SUBST(TargetHasIdentDirective) - AC_SUBST(TargetHasGnuNonexecStack) +# FPTOOLS_SET_HASKELL_PLATFORM_VARS +# ---------------------------------- +# Set the Haskell platform variables +AC_DEFUN([FPTOOLS_SET_HASKELL_PLATFORM_VARS], +[ + AC_REQUIRE([FPTOOLS_SET_HASKELL_PLATFORM_VARS_SHELL_FUNCTIONS]) + checkArch "[$]$1Arch" "Haskell$1Arch" + checkVendor "[$]$1Vendor" + checkOS "[$]$1OS" "Haskell$1Os" ]) |