pyrox.dev
gnumake: do not use MAKE_CXX
Removes unnecessary C++ compiler reference when CXX environment variable
is set to an absolute path.
+4
-2
pkgs/development/tools/build-managers/gnumake/default.nix
+4
-2
pkgs/development/tools/build-managers/gnumake/default.nix
···
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{ lib
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, stdenv
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, fetchurl
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-
, updateAutotoolsGnuConfigScriptsHook
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+
, autoreconfHook
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, guileSupport ? false, guile
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# avoid guile depend on bootstrap to prevent dependency cycles
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, inBootstrap ? false
···
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# to update apply these patches with `git am *.patch` to https://git.savannah.gnu.org/git/make.git
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patches = [
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# See patch message.
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./make-cxx.patch
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# Replaces /bin/sh with sh, see patch file for reasoning
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./0001-No-impure-bin-sh.patch
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# Purity: don't look for library dependencies (of the form `-lfoo') in /lib
···
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./0002-remove-impure-dirs.patch
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];
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-
nativeBuildInputs = [ updateAutotoolsGnuConfigScriptsHook ] ++ lib.optionals guileEnabled [ pkg-config ];
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+
nativeBuildInputs = [ autoreconfHook pkg-config ];
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buildInputs = lib.optionals guileEnabled [ guile ];
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configureFlags = lib.optional guileEnabled "--with-guile"
+64
pkgs/development/tools/build-managers/gnumake/make-cxx.patch
+64
pkgs/development/tools/build-managers/gnumake/make-cxx.patch
···
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+
Do not search for a C++ compiler and set MAKE_CXX.
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+
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Removes unnecessary reference to C++ compiler if CXX is set to an
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absolute path. If CXX is not an absolute path, we avoid defaulting CXX
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to a compiler name that was used to build the package.
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+
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Context: GNU Make defines default values for CC, CXX and other
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environment variables. For CXX, it usually defaults to g++, however,
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FreeBSD and OpenBSD no longer ship GCC as a system compiler (and use
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Clang instead). For C compiler, POSIX standardizes the name to be "cc",
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but there is no such standard for C++ compiler name. As a fix, GNU Make
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uses CXX set for build as a default (via MAKE_CXX preprocessor macro in
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the source code).
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+
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We revert the change that added this behavior and set the default to c++
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or g++ that does not depend on the build platform.
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In stdenv, CXX environment variable is always defined and overrides the
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default value.
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+
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References:
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• https://savannah.gnu.org/bugs/?63668
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• https://git.savannah.gnu.org/cgit/make.git/commit/?id=ffa28f3914ff402b3915f75e4fed86ac6fb1449d
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+
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--- a/configure.ac
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+++ b/configure.ac
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@@ -37,6 +37,4 @@ AM_INIT_AUTOMAKE([1.16.1 foreign -Werror -Wall])
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# Checks for programs.
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AC_USE_SYSTEM_EXTENSIONS
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AC_PROG_CC
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-AC_PROG_CXX
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-AC_DEFINE_UNQUOTED(MAKE_CXX, ["$CXX"], [Default C++ compiler.])
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+
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--- a/src/default.c
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+++ b/src/default.c
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@@ -528,22 +528,15 @@ static const char *default_variables[] =
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#ifdef GCC_IS_NATIVE
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"CC", "gcc",
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"OBJC", "gcc",
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+# ifdef __MSDOS__
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+ "CXX", "gpp", /* g++ is an invalid name on MSDOS */
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+# else
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+ "CXX", "g++",
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+# endif /* __MSDOS__ */
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#else
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"CC", "cc",
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"OBJC", "cc",
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+ "CXX", "c++",
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#endif
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-#ifdef MAKE_CXX
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- "CXX", MAKE_CXX,
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-#else
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-# ifdef GCC_IS_NATIVE
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-# ifdef __MSDOS__
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- "CXX", "gpp", /* g++ is an invalid name on MSDOS */
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-# else
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- "CXX", "gcc",
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-# endif /* __MSDOS__ */
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-# else
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- "CXX", "g++",
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-# endif
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-#endif
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/* This expands to $(CO) $(COFLAGS) $< $@ if $@ does not exist,
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and to the empty string if $@ does exist. */