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author | Rob Browning <rlb@defaultvalue.org> | 2024-10-05 17:18:06 -0500 |
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committer | Rob Browning <rlb@defaultvalue.org> | 2024-10-05 19:19:57 -0500 |
commit | 9b1effb58579821ffa9357df808d5264e45fb30c (patch) | |
tree | b5571419550b007d0b55c319d45b1d421e1d5641 | |
parent | 1c96e4ab6dde18c69f1493a8e1560e80a347cd21 (diff) | |
download | guile-9b1effb58579821ffa9357df808d5264e45fb30c.tar.gz |
Compile with -fexcess-precision=standard for i[3456]86 when we can
* configure.ac: when -fexcess-precision=standard is available and we're
building for i[3456]86, use it. This fixes floating point precision
problems caused by x87 (80-bit) floating point, and detected by
numbers.test.
Closes: 43262
-rw-r--r-- | NEWS | 2 | ||||
-rw-r--r-- | configure.ac | 24 |
2 files changed, 26 insertions, 0 deletions
@@ -24,6 +24,8 @@ Changes in 3.0.11 (since 3.0.10) (<https://bugs.gnu.org/71891>) ** Compiler no longer crashes when inlining 3.0.9 procedure with kw args (<https://bugs.gnu.org/72936>) +** Guile is compiled with -fexcess-precision=standard for i[3456]86 when possible + (<https://debbugs.gnu.org/43262>) Changes in 3.0.10 (since 3.0.9) diff --git a/configure.ac b/configure.ac index 262b171f1..ce3ae0226 100644 --- a/configure.ac +++ b/configure.ac @@ -62,6 +62,30 @@ AC_PROG_INSTALL AC_PROG_CC gl_EARLY +AC_MSG_CHECKING([whether the compiler supports -fexcess-precision=standard]) +old_CFLAGS="$CFLAGS" +CFLAGS="$CFLAGS -fexcess-precision=standard" +fexcess_precision='' +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int foo;], [])], [fexcess_precision=1]]) +CFLAGS="$old_CFLAGS" +if test -n "$fexcess_precision"; then + AC_MSG_RESULT([yes]) +else + AC_MSG_RESULT([no]) +fi +AC_MSG_CHECKING([whether we want -fexcess-precision=standard for $target_cpu]) +case "$target_cpu" in + i[[3456]]86) + AC_MSG_RESULT([yes]) + if test -n "$fexcess_precision"; then + CFLAGS="$CFLAGS -fexcess-precision=standard" + else + AC_MSG_WARN([floating-point precision may exceed C99 rules]) + fi + ;; + *) AC_MSG_RESULT([no]) ;; +esac + AC_MSG_CHECKING([whether the compiler supports -flto]) old_CFLAGS="$CFLAGS" LTO_CFLAGS="-flto" |