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Move -latomic check earlier in configure (autools) #3966

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merged 1 commit into from
Nov 7, 2025
Merged

Move -latomic check earlier in configure (autools) #3966

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30 changes: 15 additions & 15 deletions M2/configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -604,6 +604,21 @@ done
AC_SUBST(OPENMP_CXXFLAGS,"$OPENMP_CXXFLAGS")
AC_SUBST(OPENMP_LIBS,"$OPENMP_LIBS")

# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81358
AC_MSG_CHECKING([whether we need to link with -latomic])
AC_LANG([C++])
AC_LINK_IFELSE([AC_LANG_PROGRAM([
#include <atomic>
], [std::atomic<int64_t> x; x++])],
[AC_MSG_RESULT([no])],
[LIBS="$LIBS -latomic"
AC_LINK_IFELSE([AC_LANG_PROGRAM([
#include <atomic>
], [std::atomic<int64_t> x; x++])],
[AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([error])
AC_MSG_ERROR([unable to handle 64-bit atomics])])])

#############################################################################
AC_SUBST(BUILTLIBS)
# The list BUILTLIBS is the list of link options for the libraries we have decided to build,
Expand Down Expand Up @@ -1850,21 +1865,6 @@ AC_LINK_IFELSE([AC_LANG_SOURCE([int main() {}])],
rm -f conftest.mapfile
LDFLAGS=$SAVE

# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81358
AC_MSG_CHECKING([whether we need to link with -latomic])
AC_LANG([C++])
AC_LINK_IFELSE([AC_LANG_PROGRAM([
#include <atomic>
], [std::atomic<int64_t> x; x++])],
[AC_MSG_RESULT([no])],
[LIBS="$LIBS -latomic"
AC_LINK_IFELSE([AC_LANG_PROGRAM([
#include <atomic>
], [std::atomic<int64_t> x; x++])],
[AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([error])
AC_MSG_ERROR([unable to handle 64-bit atomics])])])

AC_SUBST(DUMPDATAFILE,Macaulay2-$ARCH-data)

test "$MEMDEBUG" = yes && M2_CPPFLAGS="$M2_CPPFLAGS -DMEMDEBUG"
Expand Down
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