diff options
Diffstat (limited to 'nixpkgs/pkgs/development/compilers/gcc/common/configure-flags.nix')
| -rw-r--r-- | nixpkgs/pkgs/development/compilers/gcc/common/configure-flags.nix | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/nixpkgs/pkgs/development/compilers/gcc/common/configure-flags.nix b/nixpkgs/pkgs/development/compilers/gcc/common/configure-flags.nix index be7f3df42de..7e0d691412b 100644 --- a/nixpkgs/pkgs/development/compilers/gcc/common/configure-flags.nix +++ b/nixpkgs/pkgs/development/compilers/gcc/common/configure-flags.nix @@ -27,6 +27,16 @@ assert cloog != null -> stdenv.lib.versionOlder version "5"; assert langJava -> stdenv.lib.versionOlder version "7"; +# Note [Windows Exception Handling] +# sjlj (short jump long jump) exception handling makes no sense on x86_64, +# it's forcably slowing programs down as it produces a constant overhead. +# On x86_64 we have SEH (Structured Exception Handling) and we should use +# that. On i686, we do not have SEH, and have to use sjlj with dwarf2. +# Hence it's now conditional on x86_32 (i686 is 32bit). +# +# ref: https://stackoverflow.com/questions/15670169/what-is-difference-between-sjlj-vs-dwarf-vs-seh + + let inherit (stdenv) buildPlatform hostPlatform targetPlatform @@ -58,8 +68,16 @@ let "--with-gnu-as" "--with-gnu-ld" "--disable-debug" - "--enable-sjlj-exceptions" "--disable-win32-registry" + "--enable-hash-synchronization" + "--enable-libssp" + "--disable-nls" + # To keep ABI compatibility with upstream mingw-w64 + "--enable-fully-dynamic-string" + ] ++ lib.optionals (crossMingw && targetPlatform.isx86_32) [ + # See Note [Windows Exception Handling] + "--enable-sjlj-exceptions" + "--with-dwarf2" ] else [ (if crossDarwin then "--with-sysroot=${lib.getLib libcCross}/share/sysroot" else "--with-headers=${lib.getDev libcCross}${libcCross.incdir or "/include"}") @@ -80,14 +98,6 @@ let ] ++ lib.optionals (targetPlatform.libc == "musl") [ # musl at least, disable: https://git.buildroot.net/buildroot/commit/?id=873d4019f7fb00f6a80592224236b3ba7d657865 "--disable-libmpx" - ] ++ lib.optionals crossMingw [ - "--enable-sjlj-exceptions" - "--enable-hash-synchronization" - "--enable-libssp" - "--disable-nls" - "--with-dwarf2" - # To keep ABI compatibility with upstream mingw-w64 - "--enable-fully-dynamic-string" ] ++ lib.optional (targetPlatform.libc == "newlib") "--with-newlib" ++ lib.optional (targetPlatform.libc == "avrlibc") "--with-avrlibc" ); |