diff options
| -rw-r--r-- | embedded.scm | 273 | ||||
| -rw-r--r-- | patches/newlib-getentropy.patch | 380 |
2 files changed, 653 insertions, 0 deletions
diff --git a/embedded.scm b/embedded.scm new file mode 100644 index 0000000..709e31f --- /dev/null +++ b/embedded.scm @@ -0,0 +1,273 @@ +(define-module (embedded) + #:use-module (guix utils) + #:use-module (guix gexp) + #:use-module (guix memoization) + #:use-module (guix packages) + #:use-module (guix download) + #:use-module (guix git-download) + #:use-module (guix build-system trivial) + #:use-module (gnu packages) + #:use-module (gnu packages embedded) + #:use-module (gnu packages flex) + #:use-module (gnu packages cross-base) + #:use-module (gnu packages texinfo) + #:use-module (guix build utils) + #:use-module (gnu packages gcc) + + #:export (make-gcc-arm-none-eabi-12.3.rel1 + make-newlib-nano-arm-none-eabi-12.3.rel1 + make-newlib-arm-none-eabi-12.3.rel1 + arm-none-eabi-nano-toolchain-12.3.rel1 + arm-none-eabi-toolchain-12.3.rel1)) + +(define make-gcc-arm-none-eabi-12.3.rel1 + (mlambda () + (let ((xgcc (cross-gcc "arm-none-eabi" + #:xgcc gcc-12 + #:xbinutils (cross-binutils "arm-none-eabi")))) + (package (inherit xgcc) + (source + (origin + (inherit (package-source xgcc)) + (method git-fetch) + (uri (git-reference + (url "git://gcc.gnu.org/git/gcc.git") + (commit "0f54a73b998b72f7c8452a63730ec3b16fc47854"))) + (sha256 + (base32 "0r6q0m3d8g3k3rkmnqjw8aw5fcnsrmywf4ispdkxmk1al3whk1vk")))) + (native-inputs + (modify-inputs (package-native-inputs xgcc) + (delete "isl") + (prepend flex isl-0.18))) + (arguments + (substitute-keyword-arguments (package-arguments xgcc) + ((#:phases phases) + #~(modify-phases #$phases + + (add-after 'set-paths 'augment-CPLUS_INCLUDE_PATH + (lambda* (#:key inputs #:allow-other-keys) + (let ((gcc (assoc-ref inputs "gcc"))) + ;; Remove the default compiler from + ;; CPLUS_INCLUDE_PATH to prevent header conflict + ;; with the GCC from native-inputs. + (setenv "CPLUS_INCLUDE_PATH" + (string-join + (delete (string-append gcc "/include/c++") + (string-split + (getenv "CPLUS_INCLUDE_PATH") + #\:)) + ":")) + (format #t + "environment variable `CPLUS_INCLUDE_PATH'\ + changed to ~a~%" + (getenv "CPLUS_INCLUDE_PATH"))))))) + ((#:configure-flags flags) + ;; The configure flags are largely identical to the flags + ;; used by the "GCC ARM embedded" project. + #~(append (list "--disable-libgomp" + "--disable-libmudflap" + "--disable-libquadmath" + "--disable-shared" + "--disable-nls" + "--disable-threads" + "--disable-tls" + "--without-cloog" + "--without-isl" + "--with-newlib" + "--with-headers=yes" + "--enable-checking=release" + "--enable-languages=c,c++" + "--with-gnu-as" + "--with-gnu-ld" + "--enable-multilib" + "--with-host-libstdcxx=-static-libgcc \ +-Wl,-Bstatic,-lstdc++,-Bdynamic -lm" + "--with-multilib-list=aprofile,rmprofile") + (delete "--disable-multilib" #$flags))))) + (native-search-paths + (list (search-path-specification + (variable "CROSS_C_INCLUDE_PATH") + (files '("arm-none-eabi/include"))) + (search-path-specification + (variable "CROSS_CPLUS_INCLUDE_PATH") + (files '("arm-none-eabi/include/c++" + "arm-none-eabi/include/c++/arm-none-eabi" + ; C has to be last since c++ headers use + ; #include_next <stdlib.h> inside of <cstdlib> + ; Heh! :) + "arm-none-eabi/include"))) + (search-path-specification + (variable "CROSS_LIBRARY_PATH") + (files '("arm-none-eabi/lib"))))))))) + +(define make-base-newlib-arm-none-eabi-12.3.rel1 + (mlambda (base) + (let ((commit "4c7d0dfec5793cbf5cf3930b91f930479126d8ce") + (revision "0")) + (package + (inherit base) + (version (git-version "3.0.0" revision commit)) + (source + (origin + (method git-fetch) + (uri (git-reference + (url "http://sourceware.org/git/newlib-cygwin.git") + (commit commit))) + (sha256 + (base32 + "0drs9v8avh4y2h5bs0ixjn9x662jzkkikx8z034wgl41dxmn6786")))) + (arguments + (substitute-keyword-arguments (package-arguments base) + ((#:phases original-phases) + #~(modify-phases #$original-phases + (replace 'fix-references-to-/bin/sh + (lambda _ + (substitute* '("libgloss/arm/cpu-init/Makefile.inc" + "libgloss/arm/Makefile.inc" + "libgloss/libnosys/Makefile.inc" + "libgloss/Makefile.in") + (("/bin/sh") (which "sh"))) + #t)))) + ;; The configure flags are identical to the flags used by the "GCC + ;; ARM embedded" project. + ((#:configure-flags flags) + #~(cons* "--enable-newlib-io-c99-formats" + "--enable-newlib-retargetable-locking" + "--enable-newlib-mb" + "--enable-newlib-reent-check-verify" + "--enable-newlib-register-fini" + #$flags)))) + (native-inputs + `(("xbinutils" ,(cross-binutils "arm-none-eabi")) + ("xgcc" ,(make-gcc-arm-none-eabi-12.3.rel1)) + ("texinfo" ,texinfo))))))) + +(define make-newlib-nano-arm-none-eabi-12.3.rel1 + (mlambda () + (make-base-newlib-arm-none-eabi-12.3.rel1 (make-newlib-nano-arm-none-eabi)))) + +(define make-newlib-arm-none-eabi-12.3.rel1 + (mlambda () + (make-base-newlib-arm-none-eabi-12.3.rel1 (make-newlib-arm-none-eabi)))) + +(define make-libstdc++-12.3.rel1 + (mlambda (xgcc newlib) + (let* ((newlib-with-xgcc + (package + (inherit newlib) + (native-inputs + (alist-replace "xgcc" (list xgcc) + (package-native-inputs newlib))))) + (base ((@@ (gnu packages embedded) make-libstdc++-arm-none-eabi) xgcc newlib-with-xgcc)) + (src (package-source base))) + (package + (inherit base) + (source + (origin + (inherit src) + (patches + (cons* (local-file "./patches/newlib-getentropy.patch") + (origin-patches src))))) + ;; TODO add back the debug phase after figuring out + ;; how the Guix build system / gcc build phases create the + ;; debug phase + (outputs '("out")) + (arguments (substitute-keyword-arguments (package-arguments base) + ((#:configure-flags flags) + #~(cons* "--with-target-subdir=yes" + "CFLAGS=-ffunction-sections -fdata-sections" + (string-append "--libdir=" + #$output + "/arm-none-eabi/lib") + #$flags)))))))) + +(define make-libstdc++-nano-12.3.rel1 + (mlambda (xgcc newlib-nano) + (let ((base (make-libstdc++-12.3.rel1 xgcc newlib-nano))) + (package + (inherit base) + (name "libstdc++-arm-none-eabi-nano") + (arguments (substitute-keyword-arguments (package-arguments base) + ((#:configure-flags flags) + #~(cons* "CFLAGS=-ffunction-sections -fdata-sections -fno-exceptions" + (filter + (lambda (flag) + (not (string-prefix? "CFLAGS=" flag))) + #$flags))) + ((#:phases phases) + #~(modify-phases #$phases + ;; This is mostly the same as for newlib-nano + (add-after 'install 'hardlink-libstdc++ + (lambda* (#:key outputs #:allow-other-keys) + (let ((out (assoc-ref outputs "out"))) + ;; The nano.specs file says that newlib-nano files should + ;; end in "_nano.a" instead of just ".a". Note that this + ;; applies to all the multilib folders too. + (for-each + (lambda (file) + (link file + (string-append + ;; Strip ".a" off the end + (substring file 0 (- (string-length file) 2)) + ;; Add "_nano.a" onto the end + "_nano.a"))) + (find-files + out "^(libstdc\\+\\+.a|libsupc\\+\\+.a)$"))))))))))))) + +(define make-arm-none-eabi-toolchain + (mlambda (xgcc newlib) + "Produce a cross-compiler toolchain package with the compiler XGCC and the +C library variant NEWLIB." + (let ((newlib-with-xgcc + (package + (inherit newlib) + (native-inputs + (alist-replace "xgcc" (list xgcc) + (package-native-inputs newlib)))))) + (package + (name "arm-none-eabi-toolchain") + (version (package-version xgcc)) + (source #f) + (build-system trivial-build-system) + (arguments + '(#:modules ((guix build union)) + #:builder + (begin + (use-modules (ice-9 match) + (guix build union)) + (match %build-inputs + (((names . directories) ...) + (union-build (assoc-ref %outputs "out") + directories)))))) + (propagated-inputs + `(("binutils" ,(cross-binutils "arm-none-eabi")) + ("libstdc++" ,(make-libstdc++-12.3.rel1 xgcc newlib)) + ("gcc" ,xgcc) + ("newlib" ,newlib-with-xgcc))) + (synopsis "Complete GCC tool chain for ARM bare metal development") + (description "This package provides a complete GCC tool chain for ARM +bare metal development. This includes the GCC arm-none-eabi cross compiler +and newlib (or newlib-nano) as the C library. The supported programming +languages are C and C++.") + (home-page (package-home-page xgcc)) + (license (package-license xgcc)))))) + +(define make-arm-none-eabi-nano-toolchain + (mlambda (xgcc newlib-nano) + (let ((base (make-arm-none-eabi-toolchain xgcc newlib-nano))) + (package + (inherit base) + (name "arm-none-eabi-nano-toolchain") + (propagated-inputs + (modify-inputs (package-propagated-inputs base) + (replace "libstdc++" (make-libstdc++-nano-12.3.rel1 xgcc newlib-nano)))))))) + +(define arm-none-eabi-toolchain-12.3.rel1 + (make-arm-none-eabi-toolchain + (make-gcc-arm-none-eabi-12.3.rel1) + (make-newlib-arm-none-eabi-12.3.rel1))) + +(define arm-none-eabi-nano-toolchain-12.3.rel1 + (make-arm-none-eabi-nano-toolchain + (make-gcc-arm-none-eabi-12.3.rel1) + (make-newlib-nano-arm-none-eabi-12.3.rel1))) diff --git a/patches/newlib-getentropy.patch b/patches/newlib-getentropy.patch new file mode 100644 index 0000000..a4137d8 --- /dev/null +++ b/patches/newlib-getentropy.patch @@ -0,0 +1,380 @@ +Patch-Source: https://github.com/zephyrproject-rtos/gcc/pull/8 + +From 55addb0c0c5ff5e0aab85574aa26abf175af85c8 Mon Sep 17 00:00:00 2001 +From: Stephanos Ioannidis <root@stephanos.io> +Date: Mon, 25 Jul 2022 23:10:41 +0900 +Subject: [PATCH] libstdc++: Do not check getentropy and arc4random for cross builds + +The "getentropy" and "arc4random" check may not yield a correct result +for the cross compile builds because linking is often not available for +them and the C library headers (notoriously, newlib) may still declare +these function prototypes even if they are not actually part of the +final library -- for this reason, this commit disables the "getentropy" +and "arc4random" checks for non-native builds. + +This effectively prevents the std::random_device from making use of +these functions when `--with-newlib` is specified, which is indeed a +correct behaviour because the newlib does not provide a default stub +for the "getentropy" function (also note that the newlib "arc4random" +implementation internally calls the missing "getentropy" function). + +For other C libraries, the `GLIBCXX_CROSSCONFIG` function may hard-code +the availability of these functions by manually defining +`HAVE_GETENTROPY` and `HAVE_ARC4RANDOM`, or by calling the +`GLIBCXX_CHECK_GETENTROPY` and `GLIBCXX_CHECK_ARC4RANDOM` functions. + +libstdc++-v3: + * configure.ac: Relocate GLIBCXX_CHECK_GETENTROPY and + GLIBCXX_CHECK_ARC4RANDOM + * configure: Regenerate. + +Signed-off-by: Stephanos Ioannidis <root@stephanos.io> +--- + libstdc++-v3/configure | 300 +++++++++++++++++++------------------- + libstdc++-v3/configure.ac | 8 +- + 2 files changed, 154 insertions(+), 154 deletions(-) + +diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure +index 0ce74e8202443..5d43b56b03ffa 100755 +--- a/libstdc++-v3/configure ++++ b/libstdc++-v3/configure +@@ -28088,6 +28088,156 @@ $as_echo "#define _GLIBCXX_USE_RANDOM_TR1 1" >>confdefs.h + + + ++ # Check for other random number APIs ++ ++ ++ ++ ac_ext=cpp ++ac_cpp='$CXXCPP $CPPFLAGS' ++ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5' ++ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' ++ac_compiler_gnu=$ac_cv_cxx_compiler_gnu ++ ++ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for getentropy" >&5 ++$as_echo_n "checking for getentropy... " >&6; } ++if ${glibcxx_cv_getentropy+:} false; then : ++ $as_echo_n "(cached) " >&6 ++else ++ ++ if test x$gcc_no_link = xyes; then ++ cat confdefs.h - <<_ACEOF >conftest.$ac_ext ++/* end confdefs.h. */ ++#include <unistd.h> ++int ++main () ++{ ++unsigned i; ++ ::getentropy(&i, sizeof(i)); ++ ; ++ return 0; ++} ++_ACEOF ++if ac_fn_cxx_try_compile "$LINENO"; then : ++ glibcxx_cv_getentropy=yes ++else ++ glibcxx_cv_getentropy=no ++fi ++rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext ++else ++ if test x$gcc_no_link = xyes; then ++ as_fn_error $? "Link tests are not allowed after GCC_NO_EXECUTABLES." "$LINENO" 5 ++fi ++cat confdefs.h - <<_ACEOF >conftest.$ac_ext ++/* end confdefs.h. */ ++#include <unistd.h> ++int ++main () ++{ ++unsigned i; ++ ::getentropy(&i, sizeof(i)); ++ ; ++ return 0; ++} ++_ACEOF ++if ac_fn_cxx_try_link "$LINENO"; then : ++ glibcxx_cv_getentropy=yes ++else ++ glibcxx_cv_getentropy=no ++fi ++rm -f core conftest.err conftest.$ac_objext \ ++ conftest$ac_exeext conftest.$ac_ext ++fi ++ ++fi ++{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_getentropy" >&5 ++$as_echo "$glibcxx_cv_getentropy" >&6; } ++ ++ if test $glibcxx_cv_getentropy = yes; then ++ ++$as_echo "#define HAVE_GETENTROPY 1" >>confdefs.h ++ ++ fi ++ ac_ext=c ++ac_cpp='$CPP $CPPFLAGS' ++ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5' ++ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' ++ac_compiler_gnu=$ac_cv_c_compiler_gnu ++ ++ ++ ++ ++ ++ ac_ext=cpp ++ac_cpp='$CXXCPP $CPPFLAGS' ++ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5' ++ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' ++ac_compiler_gnu=$ac_cv_cxx_compiler_gnu ++ ++ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for arc4random" >&5 ++$as_echo_n "checking for arc4random... " >&6; } ++if ${glibcxx_cv_arc4random+:} false; then : ++ $as_echo_n "(cached) " >&6 ++else ++ ++ if test x$gcc_no_link = xyes; then ++ cat confdefs.h - <<_ACEOF >conftest.$ac_ext ++/* end confdefs.h. */ ++#include <stdlib.h> ++int ++main () ++{ ++unsigned i = ::arc4random(); ++ ; ++ return 0; ++} ++_ACEOF ++if ac_fn_cxx_try_compile "$LINENO"; then : ++ glibcxx_cv_arc4random=yes ++else ++ glibcxx_cv_arc4random=no ++fi ++rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext ++else ++ if test x$gcc_no_link = xyes; then ++ as_fn_error $? "Link tests are not allowed after GCC_NO_EXECUTABLES." "$LINENO" 5 ++fi ++cat confdefs.h - <<_ACEOF >conftest.$ac_ext ++/* end confdefs.h. */ ++#include <stdlib.h> ++int ++main () ++{ ++unsigned i = ::arc4random(); ++ ; ++ return 0; ++} ++_ACEOF ++if ac_fn_cxx_try_link "$LINENO"; then : ++ glibcxx_cv_arc4random=yes ++else ++ glibcxx_cv_arc4random=no ++fi ++rm -f core conftest.err conftest.$ac_objext \ ++ conftest$ac_exeext conftest.$ac_ext ++fi ++ ++fi ++{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_arc4random" >&5 ++$as_echo "$glibcxx_cv_arc4random" >&6; } ++ ++ if test $glibcxx_cv_arc4random = yes; then ++ ++$as_echo "#define HAVE_ARC4RANDOM 1" >>confdefs.h ++ ++ fi ++ ac_ext=c ++ac_cpp='$CPP $CPPFLAGS' ++ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5' ++ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' ++ac_compiler_gnu=$ac_cv_c_compiler_gnu ++ ++ ++ + # For TLS support. + + +@@ -75519,156 +75669,6 @@ $as_echo "#define _GLIBCXX_X86_RDSEED 1" >>confdefs.h + fi + + +-# Check for other random number APIs +- +- +- +- ac_ext=cpp +-ac_cpp='$CXXCPP $CPPFLAGS' +-ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5' +-ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' +-ac_compiler_gnu=$ac_cv_cxx_compiler_gnu +- +- { $as_echo "$as_me:${as_lineno-$LINENO}: checking for getentropy" >&5 +-$as_echo_n "checking for getentropy... " >&6; } +-if ${glibcxx_cv_getentropy+:} false; then : +- $as_echo_n "(cached) " >&6 +-else +- +- if test x$gcc_no_link = xyes; then +- cat confdefs.h - <<_ACEOF >conftest.$ac_ext +-/* end confdefs.h. */ +-#include <unistd.h> +-int +-main () +-{ +-unsigned i; +- ::getentropy(&i, sizeof(i)); +- ; +- return 0; +-} +-_ACEOF +-if ac_fn_cxx_try_compile "$LINENO"; then : +- glibcxx_cv_getentropy=yes +-else +- glibcxx_cv_getentropy=no +-fi +-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext +-else +- if test x$gcc_no_link = xyes; then +- as_fn_error $? "Link tests are not allowed after GCC_NO_EXECUTABLES." "$LINENO" 5 +-fi +-cat confdefs.h - <<_ACEOF >conftest.$ac_ext +-/* end confdefs.h. */ +-#include <unistd.h> +-int +-main () +-{ +-unsigned i; +- ::getentropy(&i, sizeof(i)); +- ; +- return 0; +-} +-_ACEOF +-if ac_fn_cxx_try_link "$LINENO"; then : +- glibcxx_cv_getentropy=yes +-else +- glibcxx_cv_getentropy=no +-fi +-rm -f core conftest.err conftest.$ac_objext \ +- conftest$ac_exeext conftest.$ac_ext +-fi +- +-fi +-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_getentropy" >&5 +-$as_echo "$glibcxx_cv_getentropy" >&6; } +- +- if test $glibcxx_cv_getentropy = yes; then +- +-$as_echo "#define HAVE_GETENTROPY 1" >>confdefs.h +- +- fi +- ac_ext=c +-ac_cpp='$CPP $CPPFLAGS' +-ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5' +-ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' +-ac_compiler_gnu=$ac_cv_c_compiler_gnu +- +- +- +- +- +- ac_ext=cpp +-ac_cpp='$CXXCPP $CPPFLAGS' +-ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5' +-ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' +-ac_compiler_gnu=$ac_cv_cxx_compiler_gnu +- +- { $as_echo "$as_me:${as_lineno-$LINENO}: checking for arc4random" >&5 +-$as_echo_n "checking for arc4random... " >&6; } +-if ${glibcxx_cv_arc4random+:} false; then : +- $as_echo_n "(cached) " >&6 +-else +- +- if test x$gcc_no_link = xyes; then +- cat confdefs.h - <<_ACEOF >conftest.$ac_ext +-/* end confdefs.h. */ +-#include <stdlib.h> +-int +-main () +-{ +-unsigned i = ::arc4random(); +- ; +- return 0; +-} +-_ACEOF +-if ac_fn_cxx_try_compile "$LINENO"; then : +- glibcxx_cv_arc4random=yes +-else +- glibcxx_cv_arc4random=no +-fi +-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext +-else +- if test x$gcc_no_link = xyes; then +- as_fn_error $? "Link tests are not allowed after GCC_NO_EXECUTABLES." "$LINENO" 5 +-fi +-cat confdefs.h - <<_ACEOF >conftest.$ac_ext +-/* end confdefs.h. */ +-#include <stdlib.h> +-int +-main () +-{ +-unsigned i = ::arc4random(); +- ; +- return 0; +-} +-_ACEOF +-if ac_fn_cxx_try_link "$LINENO"; then : +- glibcxx_cv_arc4random=yes +-else +- glibcxx_cv_arc4random=no +-fi +-rm -f core conftest.err conftest.$ac_objext \ +- conftest$ac_exeext conftest.$ac_ext +-fi +- +-fi +-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_arc4random" >&5 +-$as_echo "$glibcxx_cv_arc4random" >&6; } +- +- if test $glibcxx_cv_arc4random = yes; then +- +-$as_echo "#define HAVE_ARC4RANDOM 1" >>confdefs.h +- +- fi +- ac_ext=c +-ac_cpp='$CPP $CPPFLAGS' +-ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5' +-ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' +-ac_compiler_gnu=$ac_cv_c_compiler_gnu +- +- +- + # This depends on GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE. + + # Do checks for resource limit functions. +diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac +index e59bcdb29441f..05cdfcddbc43b 100644 +--- a/libstdc++-v3/configure.ac ++++ b/libstdc++-v3/configure.ac +@@ -269,6 +269,10 @@ if $GLIBCXX_IS_NATIVE; then + # For /dev/random and /dev/urandom for std::random_device. + GLIBCXX_CHECK_DEV_RANDOM + ++ # Check for other random number APIs ++ GLIBCXX_CHECK_GETENTROPY ++ GLIBCXX_CHECK_ARC4RANDOM ++ + # For TLS support. + GCC_CHECK_TLS + +@@ -474,10 +478,6 @@ GLIBCXX_CHECK_X86_RDRAND + # Check if assembler supports rdseed opcode. + GLIBCXX_CHECK_X86_RDSEED + +-# Check for other random number APIs +-GLIBCXX_CHECK_GETENTROPY +-GLIBCXX_CHECK_ARC4RANDOM +- + # This depends on GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE. + GLIBCXX_CONFIGURE_TESTSUITE + |