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Added -fno-strict-aliasing to CFLAGS when the compiler supports it and autotools are in use.

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Ward Fisher 2021-07-27 11:16:58 -06:00
parent 9f798e2ed6
commit a8001f03e1
1 changed files with 19 additions and 0 deletions
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19
configure.ac
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@ -54,6 +54,25 @@ AC_CANONICAL_TARGET
AC_CONFIG_HEADERS([config.h])
##
# Check to see if the compiler supports -fno-strict-aliasing and, if so,
# add that to the C compiler flags. This is in support of https://github.com/Unidata/netcdf-c/issues/1983.
##
SAVE_CFLAGS="${CFLAGS}"
AC_LANG_PUSH([C])
CFLAGS="${CFLAGS} -fno-strict-aliasing"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
[int i = 0;]])],
[have_no_strict_aliasing=yes],
[have_no_strict_aliasing=no])
AC_MSG_CHECKING([whether compiler supports -fno-strict-aliasing])
AC_MSG_RESULT([$have_no_strict_aliasing])
AC_LANG_POP([C])
if test $have_no_strict_aliasing = no; then
CFLAGS=$SAVE_CFLAGS
fi
##
# Some files need to exist in build directories
# that do not correspond to their source directory, or