mpfr: remove pregenerated files

steps/mpfr-4.1.0/pass1.sh

@@ -5,7 +5,16 @@
 src_prepare() {
     default
 
-    find . -name '*.info' -delete
+    # Remove pregenerated table in strtofr.c
+    sed -i '/^  {/,/ };$/d' src/strtofr.c
+    cp src/strtofr.c{,.old}
+    sed -i '/int RedInvLog2Table/ s/$/};/' src/strtofr.c
+
+    rm doc/*.info
+
+    # testfiles
+    rm tests/tfpif_*.dat tests/tstrtofr.c
+
     AUTOMAKE=automake-1.15 ACLOCAL=aclocal-1.15 autoreconf-2.69 -fi
 }
 
@@ -21,6 +30,25 @@ src_configure() {
 
 src_compile() {
     make "${MAKEJOBS}" MAKEINFO=true DESTDIR="${DESTDIR}"
+
+    pushd src
+    cat > strtofr_gen.c <<EOF
+#include <stdio.h>
+#include <gmp.h>
+#include <mpfr.h>
+EOF
+    # Enable the bit of code that generates the table
+    sed -n '/^#define N 8$/,/^}$/p' strtofr.c >> strtofr_gen.c
+    gcc strtofr_gen.c -o strtofr_gen -std=gnu99 -I. -L.libs -lmpfr -lgmp
+    # ordering of 2>&1 >/dev/null is intentional here;
+    # stdout -> null
+    # stderr -> file (NOT null)
+    ./strtofr_gen 2>strtofr_table >/dev/null
+    echo "};" >> strtofr_table
+    sed "/int RedInvLog2Table/ r strtofr_table" strtofr.c.old > strtofr.c
+    popd
+
+    make "${MAKEJOBS}" MAKEINFO=true DESTDIR="${DESTDIR}"
 }
 
 src_install() {

steps/mpfr-4.1.0/patches/strtofr-gen-fix.patch

@@ -0,0 +1,28 @@
+SPDX-FileCopyrightText: 2025 fosslinux <fosslinux@aussies.space>
+
+SPDX-License-Identifier: GPL-3.0-or-later
+
+The code to generate the table in strtofr.c was written in 2004 and not
+updated since. Not sure if this case was ever actually handled.
+Without this check, we end up dividing by zero, which creates problematic
+results.
+To fix this, check if the divisor is zero, and if it is, early exit (and
+fill the rest of the continued fraction with zeros).
+
+--- mpfr-4.1.0/src/strtofr.c	2025-10-03 22:15:37.527948986 +1000
++++ mpfr-4.1.0/src/strtofr.c	2025-10-03 22:18:18.480958600 +1000
+@@ -136,6 +136,14 @@
+           mpfr_floor (y, x);
+           tab[i] = mpfr_get_ui (y, MPFR_RNDN);
+           mpfr_sub (x, x, y, MPFR_RNDN);
++          if (mpfr_zero_p(x))
++            {
++              for (i++; i < N; i++)
++                {
++                  tab[i] = 0;
++                }
++              break;
++            }
+           mpfr_ui_div (x, 1, x, MPFR_RNDN);
+         }
+       for (i = N-1 ; i >= 0 ; i--)